Privacy Policy for Wreda Text Helper

 

Privacy Policy

Effective Date: 16 February 2026

Thank you for using Wreda Text Helper.

1. Overview

Wreda Text Helper is designed to assist users with text accessibility features. We respect your privacy and are committed to protecting it.

2. No Data Collection

Wreda Text Helper:

Does NOT collect any personal information

Does NOT collect usage data

Does NOT track users

Does NOT store any personal data

We do not collect names, emails, phone numbers, device identifiers, location data, or any other personal information.

3. No Internet Usage

This application:

Does NOT require an internet connection

Does NOT transmit any data to external servers

Works fully offline

All functionality runs locally on your device.

4. No Advertising

Wreda Text Helper:

Does NOT contain advertisements

Does NOT use AdMob or any third-party advertising services

5. No Data Sharing

Since we do not collect any data, we do not share, sell, rent, or distribute any user information to third parties.

6. Accessibility Service Usage

Wreda Text Helper uses Android Accessibility Service solely to provide its core functionality.

The service is used only to assist users with text-related features and does not collect, store, or transmit any user data.

7. Children’s Privacy

Wreda Text Helper does not knowingly collect any personal information from children or adults. The app is safe for general use.

8. Changes to This Privacy Policy

If this Privacy Policy is updated, changes will be reflected in the updated version of the app listing.

9. Contact

If you have any questions about this Privacy Policy, you may contact:

Developer: dedeetok

Email: dedetoke@gmail.com

 

 

Android java: local webview from local html e.g help page

Create directory and html files

Switch to Project View (not Android view)

1. Go to: [your_project]
2. app/src/main/
3. Right click on main
4. → New
5. → Directory
6. → select or type "assets"
7. right click "assets" 
8. → New
9. → Directory
10. → type "webhelp"
11. right click "webhelp" 
12. → New
13. → File
14. → type "htmlhelp.html"
15. Repeat step 11 for your language e.g. id for Indonesia e.g. "htmlhelp_id.html" 

You can copy paste html code into htmlhelp.html" and "htmlhelp_id.html"

here is layout to show the webview

    ...
    <WebView
        android:id="@+id/my_web_help"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />
    ... 

here is code to show the webview

...
    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
...
        WebView webView = view.findViewById(R.id.my_web_help);

        // Safe defaults
        webView.getSettings().setJavaScriptEnabled(false);
        webView.getSettings().setAllowFileAccess(true);
        webView.getSettings().setDomStorageEnabled(false);

        loadHelpPage(webView);
...
    }

    /*
     * file html helper
     */
    private void loadHelpPage(WebView webView) {

        String lang = Locale.getDefault().getLanguage();
        String fileName;

        if ("id".equals(lang)) {
            fileName = "htmlhelp_id.html";
        } else {
            fileName = "htmlhelp.html";
        }

        webView.loadUrl("file:///android_asset/webhelp/" + fileName);
    }
... 

Optional configuration webview when your application got trouble when submit to application store e.g google play store

WebSettings settings = webView.getSettings();

settings.setJavaScriptEnabled(false);
settings.setDomStorageEnabled(false);
settings.setAllowFileAccess(true);          // needed for assets
settings.setAllowContentAccess(false);
settings.setAllowFileAccessFromFileURLs(false);
settings.setAllowUniversalAccessFromFileURLs(false);
settings.setSupportZoom(false);
settings.setBuiltInZoomControls(false);

  

java: comparison between database api in java android and jdbc in java standard edition

Here is comparison between database api in java android and jdbc in java standard edition  

Operation	Java Android	Java SE (JDBC)
INSERT	Returns new row ID (long)	Returns affected rows (int)
UPDATE	Returns affected rows (int)	Same
DELETE	Returns affected rows (int)	Same

In java SE (JDBC) id can be retrive using jse ps.getGeneratedKeys() return long where ps is PreparedStatement.

 

Android java: notification pattern code

add permission in project 

AndroidManifest.xml

<manifest ...>
    <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>

MainActivity.java 

   @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });

        checkPermissions();
    ....
    }



    /*
     * check permission to read contact and write shared folder Download
     */
    private void checkPermissions() {
        List<String> permissions = new ArrayList<>();

        // 1. Android 13+ Notification Permission
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
            permissions.add(Manifest.permission.POST_NOTIFICATIONS);
        }

        // API require string convert List<String> to String[];
        requestPermissionLauncher.launch(permissions.toArray(new String[0]));
    }

    /*
     * callback permission request
     */
    private final ActivityResultLauncher<String[]> requestPermissionLauncher =
            registerForActivityResult(new ActivityResultContracts.RequestMultiplePermissions(), result -> {
                // Handle Notification permission (Android 13+)
                boolean notificationsGranted = true;
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
                    notificationsGranted = result.getOrDefault(Manifest.permission.POST_NOTIFICATIONS, false);
                }

            }); 

create MyNotificationService.java class

public class MyNotificationService {

    public static final String CHANNEL_ID = "id_string_channel"; // todo
    public static final int NOTIF_ID = 123456;  // todo

    /*
     * to send notification
     */
    public static void sendNotification(Context context, String title, String message) {
        NotificationManager notificationManager =
                (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

        NotificationCompat.Builder myNotifBuilder = getNotificationBuilder(context);
        myNotifBuilder
                .setContentTitle(title)
                .setContentText(message);

        notificationManager.notify(NOTIF_ID, myNotifBuilder.build());
    }

    /*
     * get notification for foreground
     */
    public static Notification getForegroundNotification(Context context) {
        Notification myNotif = getNotificationBuilder(context).build();
        return myNotif;
    }
    
    /*
     * Helper that returns the BUILDER so you can customize it before building
     */
    private static NotificationCompat.Builder getNotificationBuilder(Context context) {
        NotificationManager notificationManager =
                (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            if (notificationManager.getNotificationChannel(CHANNEL_ID) == null) {
                NotificationChannel notifChannel = new NotificationChannel(
                        CHANNEL_ID,
                        "Background Sync Service",
                        NotificationManager.IMPORTANCE_LOW
                );
                notificationManager.createNotificationChannel(notifChannel);
            }
        }

        return new NotificationCompat.Builder(context, CHANNEL_ID)
                .setSmallIcon(android.R.drawable.stat_notify_sync)
                .setPriority(NotificationCompat.PRIORITY_LOW)
                .setCategory(Notification.CATEGORY_SERVICE);
        //.setOngoing(true); // can not swap away
    }
} 

 

 

Android java: fragment pattern code

Fragment

use just portrait for phone and w600 for tablet (bigger screen)   

for portrait (phone) 

<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical"
    >
    
    <!-- Top TextView -->
    <androidx.appcompat.widget.LinearLayoutCompat
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <androidx.appcompat.widget.AppCompatTextView
            android:id="@+id/top_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/app_name"
            android:textSize="18sp"
            android:textStyle="bold"
            android:padding="12dp"
            android:gravity="start|center_vertical"
            android:background="#DDDDDD"
            android:layout_weight="1"
            />

        <androidx.appcompat.widget.AppCompatImageButton
            android:id="@+id/button_help"
            android:layout_width="64dp"
            android:layout_height="64dp"
            android:background="?android:attr/selectableItemBackground"
            android:src="@android:drawable/ic_menu_help" />
    </androidx.appcompat.widget.LinearLayoutCompat>
    
    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/my_fragment_container_main"
        android:name="[Your java main fragment with full package name]"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        />

</androidx.appcompat.widget.LinearLayoutCompat>

for w600 tablet

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <!-- Top TextView -->
    <TextView
        android:id="@+id/top_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Your Title Here"
        android:textSize="18sp"
        android:textStyle="bold"
        android:padding="12dp"
        android:gravity="center"
        android:background="#DDDDDD" />

    <!-- Horizontal Content -->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="horizontal"
        android:weightSum="3">

    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/my_fragment_container_left"
        android:name="[Your java left fragment with full package name]"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1" />

    <View
        android:id="@+id/divider_line"
        android:layout_width="1dp"
        android:layout_height="match_parent"
        android:background="#000000" />

    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/my_fragment_container_main"
        android:name="[Your java main fragment with full package name]"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="2" />

    </LinearLayout>

</LinearLayout> 

Guideline for layout LinearLayout

• orientation android:orientation="vertical" 
  android:layout_width="match_parent" 
  android:layout_height="0dp" 
  android:layout_weight="1"
• orientation android:orientation="horizontal"
  android:weightSum="3" 
  android:layout_width="0dp" 
  android:layout_height="match_parent" android:layout_weight="1"  

in main activity on onCreate(Bundle savedInstanceState)

    public boolean isDualPane = false; // default is portrait

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });

        isDualPane = findViewById(R.id.my_fragment_container_left) != null;

        // R.id.main id for root portrait & w600

        AppCompatImageButton buttonHelp = findViewById(R.id.button_help);
        buttonHelp.setOnClickListener(buttonHelpListener);        

        // Load Fragments only if this is a fresh start (savedInstanceState == null)
        // This prevents overlapping fragments during screen rotation
        if (savedInstanceState == null) {

            // If system loaded the w600 layout, load both Fragment
            if (isDualPane) {
                replaceFragment(
                        R.id.my_fragment_container_left,
                        new FragmentLeft(),
                        null);
                replaceFragment(
                        R.id.my_fragment_container_main,
                        new FragmentMain(),
                        null);
            } else {
                // default load main container
                replaceFragment(
                        R.id.my_fragment_container_main,
                        new FragmentMain(),
                        null); // when navigating add "Fragment Main"
            }
        }

        View.OnClickListener buttonHelpListener = new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Fragment currentFragment =
                        getSupportFragmentManager()
                                .findFragmentById(R.id.my_fragment_container_main);
                if (currentFragment instanceof FragmentMain) {
                    // NOTE: we still use R.id.my_fragment_container_main in portrait
                    replaceFragment(
                            R.id.my_fragment_container_main,
                            new FragmentLeft(),
                            "Main Menu");
                } else {
                    getSupportFragmentManager().popBackStack();
                }
            }
        };

        /*
         * fragment helper
         */
        private void replaceFragment(
                         int containerId,
                         Fragment fragment,
                         String addToBackStackString) {
            FragmentTransaction transaction =
                    getSupportFragmentManager().beginTransaction();
            transaction.replace(containerId, fragment);
            if (addToBackStackString!=null) {
                transaction.addToBackStack(addToBackStackString);
            }
            transaction.commit();
        }
        ....
To implement onbackpresseddispatcher pattern code, see this  https://dedetoknotes.blogspot.com/2026/01/android-java-onbackpresseddispatcher.html

 

Android java: write and delete file in folder shared folder e.g Download pattern code

Target device Android 7 (API 24) to Android 16 (API 36)

AndroidManifest.xml permission 

     <uses-permission
        android:name="android.permission.READ_EXTERNAL_STORAGE"
        android:maxSdkVersion="32" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
        android:maxSdkVersion="28" />
    <!-- targeting api 13++ use media store -->
    <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>

To write contact (vcard) to folder com.dedetok.wredacontactbackup in folder Download

    final static String subFolder = "com.dedetok.wredacontactbackup"; // folder ref
    private static File backupFolder, backupFile; //


    private static boolean writeSingleVcf(Context context, Collection<VCard> vCards) {
        try {

            String date = new SimpleDateFormat("yyyyMMddHHmmSS", Locale.US).format(new Date());
            String fileName = date + ".vcf";


            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
                // ✅ API 29-36 (Android 10+): Use MediaStore (Scoped Storage)
                return MyWorker.writeMediaStore(context, fileName, vCards);
            } else {
                // ✅ API 24-28 (Android 7-9): Use traditional File API
                // ✅ API 29-36 (Android 10+): Use MediaStore (Scoped Storage)
                return MyWorker.writeLegacy(context, fileName, vCards);

            }
        } catch (Exception e) {
            //Log.e("dedetok",e.getMessage()); // debug
            return false;
        }
    }


    /*
     * write backup MediaStore
     */
    @RequiresApi(api = Build.VERSION_CODES.Q)
    private static boolean writeMediaStore (Context context, String fileName, Collection<VCard> vCards) throws IOException{
        ContentValues values = new ContentValues();
        //Log.e("dedetok", "writeMediaStore"); // debug
        values.put(MediaStore.MediaColumns.DISPLAY_NAME, fileName);
        values.put(MediaStore.MediaColumns.MIME_TYPE, "text/x-vcard");
        // Creates 'Download/YourSubFolder/' automatically
        values.put(MediaStore.MediaColumns.RELATIVE_PATH,
                Environment.DIRECTORY_DOWNLOADS + File.separator + subFolder);

        Uri uri = context.getContentResolver().insert(
                MediaStore.Downloads.EXTERNAL_CONTENT_URI, values);
        if (uri == null) return false;

        OutputStream os = context.getContentResolver().openOutputStream(uri);
        Ezvcard.write(vCards).version(VCardVersion.V3_0).go(os);
        return true;
    }

    /*
     * write backup in legacy mode
     */
    private static boolean writeLegacy(Context context, String fileName, Collection<VCard> vCards) throws IOException{
        // Setup Directory
        File downloads = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
        backupFolder = new File(downloads, MySharePreferences.PREF_NAME);
        // Create folder if missing
        if (!backupFolder.exists()) {
            boolean success = backupFolder.mkdirs();
            if (!success) {
                //Log.e("dedetok", "Failed to create folder. Check permissions!"); // debug
                return false;
            }
        }

        backupFile = new File(backupFolder, fileName);
        try (FileOutputStream fos = new FileOutputStream(backupFile)) {
            Ezvcard.write(vCards).version(VCardVersion.V3_0).go(fos);
        }

        //Log.d("dedetok", "File saved at: " + backupFolder.getName()); // debug

        // Tell Android to scan the file so it shows up in Windows/File Manager
        MediaScannerConnection.scanFile(
                context,
                new String[]{ backupFile.getAbsolutePath() },
                null,
                new MediaScannerConnection.OnScanCompletedListener() {
                    @Override
                    public void onScanCompleted(String path, Uri uri) {
                        //Log.e("dedetok", "Scanned: " + path);
                    }
                }
        );

        //Log.e("dedetok", "File created successfully "+backupFile.getName()); // debug
        return true;

    }

To delete file created by application from folder com.dedetok.wredacontactbackup in folder Download

    /*
     * delete File helper for android 7 yo 16
     */
    static private boolean deleteFile(Context context, File fileToDelete) {
        boolean returnValue = false;
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
            // Android 7–9
            if (fileToDelete.exists()) {
                returnValue = fileToDelete.delete();
                if (returnValue) {
                    // IMPORTANT: Tell the system the file is gone so Google Files updates
                    MediaScannerConnection.scanFile(context, new String[]{fileToDelete.getAbsolutePath()}, null, null);
                }
            }
        } else {
            // Android 10 to 16
            ContentResolver resolver = context.getContentResolver();
            Uri collection = MediaStore.Downloads.EXTERNAL_CONTENT_URI;

            // IMPORTANT: RELATIVE_PATH must end with a slash /
            String relativePath = Environment.DIRECTORY_DOWNLOADS + "/" + subFolder + "/";

            String selection = MediaStore.MediaColumns.DISPLAY_NAME + "=? AND " +
                    MediaStore.MediaColumns.RELATIVE_PATH + "=?";

            String[] selectionArgs = new String[]{
                    fileToDelete.getName(),
                    relativePath
            };

            int rows = 0;
            try {
                // Directly delete from MediaStore - this usually deletes the physical file too
                rows = resolver.delete(collection, selection, selectionArgs);
            } catch (Exception e) {
                //Log.e("dedetok", "MediaStore delete failed", e);
            }

            if (rows > 0) {
                returnValue = true;
            } else {
                // FALLBACK: Physical delete if MediaStore didn't find it
                if (fileToDelete.exists()) {
                    returnValue = fileToDelete.delete();
                    if (returnValue) {
                        // Sync the index
                        MediaScannerConnection.scanFile(context, new String[]{fileToDelete.getAbsolutePath()}, null, null);
                    }
                }
            }
        }
        return returnValue;
    }

 

Android java: OnBackPressedDispatcher pattern code

AndroidManifest.xml 

    <application
...
        android:enableOnBackInvokedCallback="true" 

Main Activity 

On main activity declare:

        // callback on back key pressed
        OnBackPressedCallback myBackPressedCallback = new OnBackPressedCallback(true) {
            @Override
            public void handleOnBackPressed() {

                FragmentManager fm = getSupportFragmentManager();

                // Pop fragment back stack if possible
                if (fm.getBackStackEntryCount() > 0) {
                    fm.popBackStack();
                    return;
                }

                // Log.e("dedetok", "handleOnBackPressed()"); //debug
                AlertDialog.Builder myAliertDialog = new AlertDialog.Builder(
                        MainActivity.this);
                myAliertDialog.setTitle(R.string.dialog_title).
                        setMessage(R.string.dialog_message).
                        setIcon(android.R.drawable.ic_dialog_alert).
                        setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {
                                // finish() will execute onDestroy()
                                finish();
                            }
                        }).
                        setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {
                                // do nothing
                            }
                        }).
                        show();
            }
        };

onCreate() in main activity

    ...
        // onbackkeypress
        // onBackPressed() deprecated -> OnBackPressedCallback & getOnBackPressedDispatcher()
        // dispatcher
        OnBackPressedDispatcher myOnbackPressedDispatcher = getOnBackPressedDispatcher();

        // add callback to dispatcher
        myOnbackPressedDispatcher.addCallback(this, myBackPressedCallback);
    ...

Fragment

To replace fragment in main activity

               Fragment helpFragment = new FragmentHelp();

                requireActivity()
                        .getSupportFragmentManager()
                        .beginTransaction()
                        .replace(R.id.fragment_container, helpFragment)
                        .addToBackStack("help")
                        .commit();

addToBackStack("help") is the way android system implement on back pressed

If you have button back on your fragment e.g helpFragment, you need to emulate OnBackPressedDispatcher

                requireActivity()
                        .getOnBackPressedDispatcher()
                        .onBackPressed();

Activity B

onCreate in activity B

    // Inside Activity B's onCreate
    getOnBackPressedDispatcher().addCallback(this, new OnBackPressedCallback(true) {
        @Override
        public void handleOnBackPressed() {
        // This runs when the physical back button OR 
        // the programmatic onBackPressed() is called.
        finish(); 
        }
    });

    // Inside your Button's onClick (Assuming it's in the Activity)
    buttonExit.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
        // This triggers the callback above
        getOnBackPressedDispatcher().onBackPressed();
        }
    });

 

 

Privacy Policy for Wreda Contact Backup

 

Wreda Contact Backup

This application will help you to backup your contact offline. These application require permission:

1. Read Contact
2. Write Storage
3. Notification

No internet connection is require since the backup will store at Download folder with sub folder com.dedetok.wredacontactbackup folder. Maximum files are set to 60 to avoid fulling your phone get full.

Minimum Android supported is 7.0.

How to use

You can backup directly by pressing "Backup Now"

For Android supported you can make scheduled. The options are:

• Weekly
• Monthly

We don't provide cloud backup, you need to safe your backup file (vcf) manually in your trusted provider by uploading the vcf file.

Data Privacy Policy

The Application does not collect, store, or share any personal information from its users.

• No Personal Data: We do not collect names, email addresses, phone numbers, or physical addresses.
• No Device Identifiers: The application does not access your device's unique ID, IP address, or contacts.
• No Location Tracking: We do not track or collect real-time geographical location information.

The Application does not use third-party services (such as analytics or advertising SDKs) that collect data for identification or tracking.

Since the Application does not collect or store any user data, there is no risk of your personal data being accessed by unauthorized individuals through our servers.

If you have any questions or suggestions about this Privacy Policy, do not hesitate to contact us at dedetoke@gmail.com.

 

 

 

Android java: gradle corrupted, how to fix it

This is error message when gradle corrupted due to accidentally deleted or fail updated.

"The contents of the immutable workspace '~/.gradle/caches/9.1.0/groovy-dsl/52b1078aa736f3877f522d2046a7f837' have been modified" 

To make easier to fix gradle, exit Android Studio, open shell and go to project root directory. You will find file gradlew.

Clean up your gradle

$ ./gradlew --stop
Stopping Daemon(s)
2 Daemons stopped
$ rm -rf ~/.gradle/caches/9.1.0/

Run help to force gradlew download and rebuild library required.

$ ./gradlew help
Starting a Gradle Daemon, 2 stopped Daemons could not be reused, use --status for details

> Configure project :app
WARNING: The option setting 'android.usesSdkInManifest.disallowed=false' is deprecated.
The current default is 'true'.
It will be removed in version 10.0 of the Android Gradle plugin.
WARNING: The option setting 'android.sdk.defaultTargetSdkToCompileSdkIfUnset=false' is deprecated.
The current default is 'true'.
It will be removed in version 10.0 of the Android Gradle plugin.
WARNING: The option setting 'android.enableAppCompileTimeRClass=false' is deprecated.
The current default is 'true'.
It will be removed in version 10.0 of the Android Gradle plugin.
WARNING: The option setting 'android.builtInKotlin=false' is deprecated.
The current default is 'true'.
It will be removed in version 10.0 of the Android Gradle plugin.
WARNING: The option setting 'android.newDsl=false' is deprecated.
The current default is 'true'.
It will be removed in version 10.0 of the Android Gradle plugin.
WARNING: The option setting 'android.r8.optimizedResourceShrinking=false' is deprecated.
The current default is 'true'.
It will be removed in version 10.0 of the Android Gradle plugin.
WARNING: The option setting 'android.defaults.buildfeatures.resvalues=true' is deprecated.
The current default is 'false'.
It will be removed in version 10.0 of the Android Gradle plugin.
w: file://~/Workspace/Android/WredaContactBackup/app/build.gradle.kts:5:1: 'fun Project.android(configure: Action<BaseAppModuleExtension>): Unit' is deprecated. Replaced by com.android.build.api.dsl.ApplicationExtension.
This class is not used for the public extensions in AGP when android.newDsl=true, which is the default in AGP 9.0, and will be removed in AGP 10.0.
WARNING: The property android.dependency.excludeLibraryComponentsFromConstraints improves project import performance for very large projects. It should be enabled to improve performance.
To suppress this warning, add android.generateSyncIssueWhenLibraryConstraintsAreEnabled=false to gradle.properties
WARNING: The property android.dependency.excludeLibraryComponentsFromConstraints improves project import performance for very large projects. It should be enabled to improve performance.
To suppress this warning, add android.generateSyncIssueWhenLibraryConstraintsAreEnabled=false to gradle.properties
WARNING: The property android.dependency.excludeLibraryComponentsFromConstraints improves project import performance for very large projects. It should be enabled to improve performance.
To suppress this warning, add android.generateSyncIssueWhenLibraryConstraintsAreEnabled=false to gradle.properties
WARNING: The property android.dependency.excludeLibraryComponentsFromConstraints improves project import performance for very large projects. It should be enabled to improve performance.
To suppress this warning, add android.generateSyncIssueWhenLibraryConstraintsAreEnabled=false to gradle.properties

> Task :help

Welcome to Gradle 9.1.0.

To run a build, run gradlew <task> ...

To see a list of available tasks, run gradlew tasks

To see more detail about a task, run gradlew help --task <task>

To see a list of command-line options, run gradlew --help

For more detail on using Gradle, see https://docs.gradle.org/9.1.0/userguide/command_line_interface.html

For troubleshooting, visit https://help.gradle.org

BUILD SUCCESSFUL in 28s
1 actionable task: 1 executed
Consider enabling configuration cache to speed up this build: https://docs.gradle.org/9.1.0/userguide/configuration_cache_enabling.html

Open your Android Studio, repair android studio project choose index repair.

If this error occurred

"Ambiguous method call: both 'FragmentActivity.onCreate(Bundle) (In ~/.gradle/caches/9.1.0/transforms/dae60150ff0476652c6b13819aa96f10/transformed/fragment-1.5.4/jars/classes.jar!/androidx/fragment/app/FragmentActivity.class)' and 'ComponentActivity.onCreate(Bundle) (In ~/.gradle/caches/9.1.0/transforms/48c7a661e0aa50fff79a603bd45cc34c/transformed/activity-1.12.2/jars/classes.jar!/androidx/activity/ComponentActivity.class)' match"

Invalidate cache (everything) and restart.

If you find some deprecated gradle option like these:

$ ./gradlew help
Starting a Gradle Daemon, 1 incompatible and 1 stopped Daemons could not be reused, use --status for details

> Configure project :app
WARNING: The option setting 'android.usesSdkInManifest.disallowed=false' is deprecated.
The current default is 'true'.
It will be removed in version 10.0 of the Android Gradle plugin.
WARNING: The option setting 'android.sdk.defaultTargetSdkToCompileSdkIfUnset=false' is deprecated.
The current default is 'true'.
It will be removed in version 10.0 of the Android Gradle plugin.
WARNING: The option setting 'android.enableAppCompileTimeRClass=false' is deprecated.
The current default is 'true'.
It will be removed in version 10.0 of the Android Gradle plugin.
WARNING: The option setting 'android.builtInKotlin=false' is deprecated.
The current default is 'true'.
It will be removed in version 10.0 of the Android Gradle plugin.
WARNING: The option setting 'android.newDsl=false' is deprecated.
The current default is 'true'.
It will be removed in version 10.0 of the Android Gradle plugin.
WARNING: The option setting 'android.r8.optimizedResourceShrinking=false' is deprecated.
The current default is 'true'.
It will be removed in version 10.0 of the Android Gradle plugin.
WARNING: The option setting 'android.defaults.buildfeatures.resvalues=true' is deprecated.
The current default is 'false'.
It will be removed in version 10.0 of the Android Gradle plugin.
WARNING: The property android.dependency.excludeLibraryComponentsFromConstraints improves project import performance for very large projects. It should be enabled to improve performance.
To suppress this warning, add android.generateSyncIssueWhenLibraryConstraintsAreEnabled=false to gradle.properties
WARNING: The property android.dependency.excludeLibraryComponentsFromConstraints improves project import performance for very large projects. It should be enabled to improve performance.
To suppress this warning, add android.generateSyncIssueWhenLibraryConstraintsAreEnabled=false to gradle.properties
WARNING: The property android.dependency.excludeLibraryComponentsFromConstraints improves project import performance for very large projects. It should be enabled to improve performance.
To suppress this warning, add android.generateSyncIssueWhenLibraryConstraintsAreEnabled=false to gradle.properties
WARNING: The property android.dependency.excludeLibraryComponentsFromConstraints improves project import performance for very large projects. It should be enabled to improve performance.
To suppress this warning, add android.generateSyncIssueWhenLibraryConstraintsAreEnabled=false to gradle.properties

> Task :help

Welcome to Gradle 9.1.0.

To run a build, run gradlew <task> ...

To see a list of available tasks, run gradlew tasks

To see more detail about a task, run gradlew help --task <task>

To see a list of command-line options, run gradlew --help

For more detail on using Gradle, see https://docs.gradle.org/9.1.0/userguide/command_line_interface.html

For troubleshooting, visit https://help.gradle.org

BUILD SUCCESSFUL in 5s
1 actionable task: 1 executed
Consider enabling configuration cache to speed up this build: https://docs.gradle.org/9.1.0/userguide/configuration_cache_enabling.html

Edit file gradle.properties, find those configuration and take some adjustment. You can close Android Studio and back to shell, this is my gradle.properties:

# Project-wide Gradle settings.
# IDE (e.g. Android Studio) users:
# Gradle settings configured through the IDE *will override*
# any settings specified in this file.
# For more details on how to configure your build environment visit
# http://www.gradle.org/docs/current/userguide/build_environment.html
# Specifies the JVM arguments used for the daemon process.
# The setting is particularly useful for tweaking memory settings.
org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
# When configured, Gradle will run in incubating parallel mode.
# This option should only be used with decoupled projects. For more details, visit
# https://developer.android.com/r/tools/gradle-multi-project-decoupled-projects
# org.gradle.parallel=true
# AndroidX package structure to make it clearer which packages are bundled with the
# Android operating system, and which are packaged with your app's APK
# https://developer.android.com/topic/libraries/support-library/androidx-rn
android.useAndroidX=true
# Enables namespacing of each library's R class so that its R class includes only the
# resources declared in the library itself and none from the library's dependencies,
# thereby reducing the size of the R class for that library
android.nonTransitiveRClass=true
#android.defaults.buildfeatures.resvalues=true #deprecated
#android.sdk.defaultTargetSdkToCompileSdkIfUnset=false #deprecated
#android.enableAppCompileTimeRClass=false #deprecated
#android.usesSdkInManifest.disallowed=false #deprecated
android.uniquePackageNames=false
android.dependency.useConstraints=true
android.r8.strictFullModeForKeepRules=false
#android.r8.optimizedResourceShrinking=false #deprecated
#android.builtInKotlin=false #deprecated
#android.newDsl=false #deprecated
# edited dedetok
#android.enableJetifier=true
android.generateSyncIssueWhenLibraryConstraintsAreEnabled=false

Validate gradle is clear

$ ./gradlew help

> Task :help

Welcome to Gradle 9.1.0.

To run a build, run gradlew <task> ...

To see a list of available tasks, run gradlew tasks

To see more detail about a task, run gradlew help --task <task>

To see a list of command-line options, run gradlew --help

For more detail on using Gradle, see https://docs.gradle.org/9.1.0/userguide/command_line_interface.html

For troubleshooting, visit https://help.gradle.org

BUILD SUCCESSFUL in 503ms
1 actionable task: 1 executed
Consider enabling configuration cache to speed up this build: https://docs.gradle.org/9.1.0/userguide/configuration_cache_enabling.html

Now you have clean project.  

adb command references (android debug bridge)

to add path for platform-tool edit .bashrc (for Debian), append at the end. log out and sign in again to get affect or run $ source ~/.bashrc

export PATH=$PATH:$HOME/AndroidStudio/Sdk/platform-tools/

to show devices attached 

$ adb devices
* daemon not running; starting now at tcp:5037
adb * daemon started successfully
List of devices attached
A6501D9863TH039779    unauthorized -> Not allow, please allow on your device
$ adb devices
List of devices attached
A6501D9863TH039779    device -> your device allow to debug

to install application (don't support aab, compile to apk) 

$ adb install example.apk
Performing Streamed Install
Success

to uninstall package 

$ adb uninstall com.dedetok.radiowalkman
Success

to uninstall package (bloatware) for user 0 (default user). Use adb shell pm instead directly adb uninstall. Note: it just remove for current default user, it does not remove from firmware, you need to root your device for fully removal. After reset your device, the bloatware will come again.

$ adb uninstall --user 0 com.example.app vs 
$ adb shell uninstall --user 0 com.example.app
$ adb shell pm uninstall --user 0 net.bat.store
Success
com.transsion.aivoiceassistant

to list packages 

$ adb shell pm list packages | grep dedetok
package:com.dedetok.turuntirta
package:com.dedetok.pitrapuja

to list directory Download 

$ adb shell ls /sdcard/Download/com.dedetok.wredacontactbackup
test.txt

to get error Logcat 

$ adb logcat | grep com.dedetok.wredacontactbackup

• WorkManager
  $ adb logcat -s dedetok WorkManager WM-WorkerWrapper
--------- beginning of system
--------- beginning of crash
--------- beginning of main
01-20 14:51:59.303 25534 25561 E WM-WorkerWrapper: Didn't find WorkSpec for id 6548d3d5-2c2e-47a0-a795-ff4f9365b2be
01-20 14:51:59.311 25534 25561 E WM-WorkerWrapper: Didn't find WorkSpec for id e42ac4be-f95e-41e8-9694-e4eb6bc40671
01-20 14:51:59.319 25534 25561 E WM-WorkerWrapper: Didn't find WorkSpec for id e42ac4be-f95e-41e8-9694-e4eb6bc40671

to get error

$ adb shell dumpsys dropbox | grep com.dedetok.wredacontactbackup

to clear data include cache for package com.dedetok.wredacontactbackup

$ adb shell pm clear com.dedetok.wredacontactbackup

Check JobScheduler (where WorkManager stores jobs)

$ adb shell dumpsys jobscheduler | grep -A 30 "com.dedetok.wredacontactbackup"
  JOB #u0a124/1: 7b2babf com.dedetok.wredacontactbackup/androidx.work.impl.background.systemjob.SystemJobService
    u0a124 tag=*job*/com.dedetok.wredacontactbackup/androidx.work.impl.background.systemjob.SystemJobService

#u0a124/1 last digit /1 is job id  

Force scheduler to run, use job id

$ adb shell cmd jobscheduler run -f com.dedetok.wredacontactbackup 1
Running job [FORCED] 

 

 

 

 

Android java: dealing with Trusted credentials on Android 7.1.1 below for letencrypt

Dealing with connection to https on old android may depend on Trusted credentials on the the device. 

Letsencrypt root certificate does not installed on Trusted credentials prior android 7.1.1.

Some application may throw:

java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.


Solution 1 add user Trusted credentials 

Install Letsencrypt pem manually on old phone i.e android version 7.1.1 or older. You can download from https://letsencrypt.org/certs/isrgrootx1.pem?hl=en-US .

On your device (mine is evercoss gen pro x pro android 7.0). Go to setting -> Security.

You may find:

• Trusted Credentials 
• User Credentials
• Install from SD Card

Choose "Install from SD Card":

• Filed Name of Certification e.g ISGR ROOT X1 or Letsecrypt.
• Credentials Use select VPN and aps

Open your Android Studio project and create res/xml/network_security_config.xml.

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <base-config>
        <trust-anchors>
            <certificates src="system" />
            <certificates src="user" />
        </trust-anchors>
    </base-config>
</network-security-config>

Edit AndroidManifest.xml

...
   <application
    ... 
   android:networkSecurityConfig="@xml/network_security_config"
   ...
   >
...

If https server ever falls back to http (not https), you should add cleartextTrafficPermitted="true" to the <base-config> tag (Not Recommended except your application need to access http):

...
<base-config 
   ...
   cleartextTrafficPermitted="true"
   ...
>
...

if this XML fix doesn't work, it's not the certificate—it's the Android 7.0 Cipher bug. In that specific case, you will have to use Conscrypt library (Solution 2).

Solution 2 using Conscript Library

Add dependency into gradle.build app

dependencies {
    ...
    implementation 'org.conscrypt:conscrypt-android:2.5.2'
    ...
}

Initialize at application startup or foreground

...
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N_MR1) { 
    // Below Android 7.1.1
    Security.insertProviderAt(Conscrypt.newProvider(), 1);
}
...

Android java: input events processing (collection)

There 2 ways to handle input events from user input

1. Immediate: using listener
2. At process: at the end to process data, usually user fire "process" button 

Button

    @Override
    protected void onCreate(Bundle savedInstanceState) {
...
        // to process
        AppCompatButton buttonTest = findViewById(R.id.button_test); // change to your button id from layout
        buttonTest.setOnClickListener(myTest);
    }

    View.OnClickListener myButton = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // todo

        }
    };

TimePicker

1. Immediate 

...
        //on view created
        // date picker
        TimePicker myTimePicker = view.findViewById(R.id.my_time_picker);
        myTimePicker.setOnTimeChangedListener(timeChangeListener);
...
    // TimePicker Listeneer
    private final TimePicker.OnTimeChangedListener timeChangeListener =
            new TimePicker.OnTimeChangedListener() {
        @Override
        public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
            // TODO
        }
    };

2.  At process

    // Pull the values exactly as they are right now
    int hour = timePicker.getHour();
    int minute = timePicker.getMinute();

RadioGroup

1. Immediate

...
        //on view created
        // date picker
        RadioGroup radioSelectModeBackup = view.findViewById(R.id.radio_select_mode_backup);
        radioSelectModeBackup.setOnCheckedChangeListener(radioListener);
...
    // RadioGroup Listener
    RadioGroup.OnCheckedChangeListener radioListener = new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(@NonNull RadioGroup radioGroup, int idSelected) {
            if (idSelected==R.id.radio_weekly) {
                // weekly
            } else if (idSelected==R.id.radio_moonthly) {
                // monthly
            }
        }
    };

2. At process 

    // Inside your "Save" or "Submit" button click listener
    int selectedId = radioSelectModeBackup.getCheckedRadioButtonId();

    if (selectedId == R.id.radio_weekly) {
        // Logic for weekly backup
    } else if (selectedId == R.id.radio_moonthly) {
        // Logic for monthly backup
    } else {
        // Nothing is selected (returns -1 if no default is set in XML)
    }

RecyclerView

RecyclerView layout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="64dp"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="horizontal"
    android:background="#FFFFFF"
    android:gravity="center_vertical">

    <HorizontalScrollView
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:scrollbars="none"
        android:fillViewport="true">

        <TextView
            android:id="@+id/my_item_view"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center_vertical"
            android:paddingStart="12dp"
            android:paddingEnd="12dp"
            android:textSize="20sp"
            android:maxLines="1"
            android:textColor="#333333" />
    </HorizontalScrollView>

    <ImageButton
        android:id="@+id/btn_add_phrase"
        android:layout_width="64dp"
        android:layout_height="match_parent"
        android:src="@android:drawable/ic_input_add"
        android:background="?android:attr/selectableItemBackground"
        android:contentDescription="Add phrase"
        android:scaleType="centerInside"
        app:tint="#4CAF50" />

</LinearLayout>

RecyclerView Adapter and Holder

public class MyRecyclerView extends RecyclerView.Adapter<MyRecyclerView.ViewHolder> {

    String[] stringsTmp = {"Hello", "Test", "How are you?", "Help me write", "The quick brown fox jumps over the lazy dog\n The quick brown fox jumps over the lazy dog"};
    OnMyItemClickListener onMyItemClickListener;

    public MyRecyclerView(OnMyItemClickListener listener) {
        // Use the parameter 'listener', not the uninitialized global variable
        this.onMyItemClickListener = listener;
    }

    @NonNull
    @Override
    public MyRecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.layout_view_item, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull MyRecyclerView.ViewHolder holder, int position) {
        // Get the string from your array and put it in the TextView
        String text = stringsTmp[position];
        holder.textView.setText(text);

        // Add a click listener for the item NOT WORKINGN HERE
        // Set the click here. It can see 'onMyItemClickListener' and 'text'
        holder.addButton.setOnClickListener(v -> {
            Log.e("dedetok", "onBindViewHolder Clicked : " + text);
            if (onMyItemClickListener != null) {
                onMyItemClickListener.getString(text);
            }
        });

    }

    @Override
    public int getItemCount() {
        return stringsTmp.length;
    }


    /*
     * View Holder
     */
    public static class ViewHolder extends RecyclerView.ViewHolder {
        public TextView textView;
        public ImageButton addButton; // Changed from Button

        public ViewHolder(View view) {
            super(view);
            // Matches the ID in your item_phrase.xml
            textView = view.findViewById(R.id.my_item_view);
            addButton = view.findViewById(R.id.btn_add_phrase);

        }
    }

    public interface OnMyItemClickListener {
        void getString(String stringSelect);
    }
}

If you use action listener on item in holder, DO NOT add onItemSelected event into adapter or any else touch event. They will conflict with other event inside the items.

You need to implement interface  MyRecyclerView.OnMyItemClickListener on your activity or fragment.

You can remove all event on holder if you prefered to use onItemSelected event.

 

 

 

 

 

Debian 13: bash to clean up unused gradle in folder $HOME/.gradle

stop any gradle daemon (better run this after you start your Debian)

copy paste this bash and change permission to execute

#!/bin/bash

# Set the cutoff date yyyy-mm-dd
CUTOFF_DATE="2025-08-01"

# Gradle folder
GRADLE_DIR="$HOME/.gradle"

# List of folders to clean
FOLDERS=("android" "build-scan-data" "caches" "daemon" "kotilin-profile" "native" "notifications" "undefined-build" "wrapper" ".tmp")

# 1. Stop Gradle Daemons first so files aren't locked
if [ -f "$GRADLE_DIR/daemon" ]; then
    echo "Stopping Gradle daemons..."
    gradle --stop 2>/dev/null || ./gradlew --stop 2>/dev/null
fi

echo "Cleaning Gradle folders in $GRADLE_DIR modified before $CUTOFF_DATE..."

for folder in "${FOLDERS[@]}"; do
    TARGET="$GRADLE_DIR/$folder"
    if [ -d "$TARGET" ]; then
        echo "Processing $TARGET..."
        # Find and delete files modified before the cutoff date
        find "$TARGET" -type f ! -newermt "$CUTOFF_DATE" -print -delete
        # Remove empty directories
        find "$TARGET" -type d -empty -print -delete
    else
        echo "Folder $TARGET does not exist, skipping."
    fi
done

echo "Cleanup complete."

Note:

• change CUTOFF_DATE for any desire date
• add or remove FOLDERS depends on your folder structure 

termux android: ffmpeg split video, rotate, convert h26h video, merge video

Requirement

Install termux from 

• play store 
• github.com/termux/termux-app latest but require allow install from unknown source

open termux and update

$ pkg upgrade

install ffmpeg

$ pkg install ffmpeg nano termux-api

Allow termux to manage files

$ termux-setup-storage

Finding the correct path 

Find location of your file, and open termux

You can get file info from file manager provided by your phone. This is information from Google File -> File info

/emulated/0/DCIM/Camera/Thumbnail/ebd64812dbf4ded1ce79xa 

Open your termux

 ~ $ cd ~/storage
~/storage $ pwd
/data/data/com.termux/files/home/storage
~/storage $ ls
audiobooks  downloads   movies    podcasts
dcim        external-0  music     shared
documents   media-0     pictures

In android it is DCIM but in termux it is become dcim 

Note these:

• From file manager: /emulated/0/DCIM/Camera/Thumbnail/ebd64812dbf4ded1ce79xa -> to broadcast the files
• From termux: /data/data/com.termux/files/home/storage/dcim/Camera/Thumbnail/ebd64812dbf4ded1ce79xa -> to browse in termux terminal

Split a video by time

Target:

• every piece has 1 minutes 58 seconds
• resolution low 480
• output h264
• sound mono

command to convert '172967815750944 (1).mp4'

$ ffmpeg -i 172967815750944\ \(1\).mp4 -vf scale=-2:480 -r 25 -c:v libx264 -preset veryfast -crf 28 -ac 1 -c:a aac -b:a 96k -f segment -segment_time 118 -reset_timestamps 1 out_%03d.mp4

this command will create files with name starting with name out_[number].mp4

This is fastest way to split video into smaller size, but you need to write the long command. This is bash sh to split file to avoid write long command. Open nano and copy paste it, name it with mysplitvid.sh. Make it execute $ chmod u+x mysplitvid.sh.

#!/data/data/com.termux/files/usr/bin/bash

# Check input
if [ -z "$1" ]; then
  echo "Usage: $0 inputvideo.mp4"
  exit 1
fi

INPUT="$1"
BASENAME=$(basename "$INPUT" .mp4)

# Output directory (public, visible to other apps)
OUTDIR="/sdcard/Download/${BASENAME}_split"
mkdir -p "$OUTDIR"

# FFmpeg split + encode
ffmpeg -i "$INPUT" \
  -vf scale=-2:480 \
  -r 25 \
  -c:v libx264 \
  -preset veryfast \
  -crf 28 \
  -ac 1 \
  -c:a aac \
  -b:a 96k \
  -f segment \
  -segment_time 118 \
  -reset_timestamps 1 \
  "$OUTDIR/${BASENAME}_out%02d.mp4"

# Notify Android media scanner for all outputs
for file in "$OUTDIR"/*.mp4; do
  am broadcast \
    -a android.intent.action.MEDIA_SCANNER_SCAN_FILE \
    -d "file://$file" >/dev/null
done

echo "✅ Done!"
echo "📂 Output folder: $OUTDIR”

Convert video h256 to social media

Target:

• Video Codec: H.264 (libx264)
• Audio Codec: AAC
• Pixel Format: yuv420p (Required for maximum compatibility)
• Audio Sample Rate: 48kHz or 44.1kHz
• Container: MP4  

To convert an H.265 MP4 to a Twitter-compatible, highly compressed, lower-resolution MP4 using FFmpeg, you need to re-encode the video to H.264 video codec, AAC audio codec, a maximum resolution of 1280x720, and a lower bitrate/higher CRF value.

Assume your file is inputfile.mp4 and located at Download folder in your Android.  Here are command to convert your video to make compatible for social media. Currently social media do not support high compression like h265.

~/ $ cd ~/storage
~/storage $ ls
audiobooks downloads movies podcasts
dcim external-0 music shared
documents media-0 pictures
~/storage $ cd downloads
~/storage/downloads $ ls *.mp4
inputfile.mp4
~/storage/downloads $ ffmpeg -i inputfile.mp4 -c:v libx264 -crf 28 -preset medium -vf "scale=1280:720,format=yuv420p" -c:a aac -b:a 128k -movflags faststart output.mp4
...

This is bash sh to split file to avoid write long command. Open nano and copy paste it, name it with myconverth265.sh. Make it execute $ chmod u+x myconverth265.sh.

#!/data/data/com.termux/files/usr/bin/bash
set -e
if [ $# -ne 2 ]; then
    echo "Usage: $0 input.mp4 output.mp4"
    exit 1
fi

INPUT="$1"
OUTPUT="$2"

ffmpeg -i "$INPUT" \
  -c:v libx264 -crf 28 -preset medium \
  -vf "scale=1280:720,format=yuv420p" \
  -c:a aac -b:a 128k \
  -movflags faststart \
  "$OUTPUT"

MEDIA_PATH="$(realpath "$OUTPUT")"

am broadcast \
  -a android.intent.action.MEDIA_SCANNER_SCAN_FILE \
  -d "file://$MEDIA_PATH"

echo "Scanned:"
echo "$MEDIA_PATH"

Rotate

ffmpeg -i inputvid.mp4 -vf "transpose=1" outputvid.mp4
Parameters:
-i inputvid.mp4: Specifies the input video file.
-vf "transpose=1": This filter rotates the video 90 degrees clockwise.
0 = 90° counterclockwise and vertical flip (default) 
1 = 90° clockwise 
2 = 90° counterclockwise 
3 = 90° clockwise and vertical flip

Example use

$ cd storage/dcim/Camera
ffmpeg -i input.mp4 -vf "transpose=2" out.mp4
$ ls ~/storage/dcim/Camera/out.mp4 
/data/data/com.termux/files/home/storage/dcim/Camera/out.mp4
am broadcast -a android.intent.action.MEDIA_SCANNER_SCAN_FILE -d file:///storage/emulated/0/DCIM/Camera/out.mp4

Merge file with the same video properties

list file to merge

~/.../Thumbnail/ebd64812dbf4ded1ce79xa $ ls
out_001.mp4  out_004.mp4  out_007.mp4
out_002.mp4  out_005.mp4
out_003.mp4  out_006.mp4 

Create file list.txt

~/.../Thumbnail/ebd64812dbf4ded1ce79xa $ nano list.txt
E.g
# comment list of files
file 'out_001.mp4'
file 'out_002.mp4'
file 'out_003.mp4'
file 'out_004.mp4'
file 'out_005.mp4'
file 'out_006.mp4'
file 'out_007.mp4’ 

Merge

~/.../Thumbnail/ebd64812dbf4ded1ce79xa $ ffmpeg -f concat -safe 0 -i list.txt -c copy merged.mp4 

broadcast the new video

~/.../Thumbnail/ebd64812dbf4ded1ce79xa $ am broadcast -a android.intent.action.MEDIA_SCANNER_SCAN_FILE -d file:///sdcard/DCIM/Camera/Thumbnail/ebd64812dbf4ded1ce79xa

Make your output video accessible by other application 

Your output file owner is Termux. To make it accessible by other applications e.g. photos, files, etc, you can try these option

• Force android system to scan your output

$ am broadcast -a android.intent.action.MEDIA_SCANNER_SCAN_FILE -d file:///sdcard/[real_location]

From file location above

Note these:

• From file manager: /emulated/0/DCIM/Camera/Thumbnail/ebd64812dbf4ded1ce79xa
• From termux: /data/data/com.termux/files/home/storage/dcim/Camera/Thumbnail/ebd64812dbf4ded1ce79xa 

Replace [real_location] becomes file:///sdcard/DCIM/Camera/Thumbnail/ebd64812dbf4ded1ce79xa

It will scan all files in drive, or you can specify for specific file only.

Using termux-api (termux-media-scan) is an alternative way for am.  On newer Android versions (Android 10+), this may not work due to scoped storage restrictions. termux-media-scan is the recommended way. 

$ termux-media-scan /sdcard/[real_location] 

I test am and termux-media-scan on android 13 infinix Note 12, they work properly without issue. except for multimedia store in Thumbnail folder, only show in file manager, e.g google files.

Using bash script

To use bash script, at ~/ create bash script e.g. convert.sh and you can paste the bash code above under nano editor

~/ $ nano convert.sh
~/ $ chmod +x convert.sh

Goto directory e.g Download and run the script using ~/[filename].sh e.g 

~/.../Thumbnail/ebd64812dbf4ded1ce79xa $ ~/convert.sh vidIn.mp4 vinOut.mp3