Android java: using SQLiteOpenHelper instead Room Library

Using additional Room may increase size of application, means more lines required to executed. I preferred to implement SQLiteOpenHelper rather then using Room Library.

Here is code for extending SQLiteOpenHelper:

package com.dedetok.radiowalkman.mydb;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

import androidx.annotation.Nullable;

/*
 * added 20240319
 * Async task will be done in DB Repository to access database (RUD)
 */

public class MyDBHelper extends SQLiteOpenHelper {

    final static String dbName = "myradiolist"; // db name must final static
    final static int dbversion = 2; // db version must final static

    public MyDBHelper(@Nullable Context appContext) {
        //
        super(appContext, dbName, null, dbversion);
    }

    /*
     * Only called once after creating a new database
     * Will not called if database exist (upgrade version)
     */
    @Override
    public void onCreate(SQLiteDatabase sqLiteDatabase) {
        //Log.e("dedetok","onCreate"); //debug
        createMyDB(sqLiteDatabase);
    }

    /*
     * Only called once if database exist and version number increase (upgrade)
     */
    @Override
    public void onUpgrade(SQLiteDatabase sqLiteDatabase, int oldVersion, int newVersion) {
        // upgrade from 1 to 2
        //Log.e("dedetok","onUpgrade "+oldVersion+" to "+newVersion); //debug
        if (oldVersion==1) {
            upgradeDBV1toV2(sqLiteDatabase);
        }

    }

    /*
     * version 1
     */
    private void createMyDB(SQLiteDatabase sqLiteDatabase) {
        //Log.e("dedetok","createMyDB"); //debug
        // Main table radiolist
        String sqlCreateRadioList = "CREATE TABLE IF NOT EXISTS "+
                "radiolist ("+
                "countryname TEXT NOT NULL,"+
                "cityname TEXT NOT NULL,"+
                "radiostation TEXT NOT NULL,"+
                "logourl TEXT NOT NULL,"+
                "streamurl TEXT NOT NULL,"+
                "PRIMARY KEY(countryname, cityname, radiostation));";
        sqLiteDatabase.execSQL(sqlCreateRadioList);
        // table radiolistversion only has 1 record and one column
        String sqlCreateRadioListVersion = "CREATE TABLE IF NOT EXISTS "+
                "radiolistversion ("+
                "listversion TEXT NOT NULL,"+
                "PRIMARY KEY(listversion));";
        sqLiteDatabase.execSQL(sqlCreateRadioListVersion);

        //Log.e("dedetok", "create table app_preferences"); //debug
        // 20240422
        upgradeDBV1toV2(sqLiteDatabase);

    }

    /*
     * version 1 to version 2
     */
    private void upgradeDBV1toV2(SQLiteDatabase sqLiteDatabase) {
        //Log.e("dedetok", "upgradeDBV1toV2"); //debug
        // 20240422
        String sqlCreatePreferences = "CREATE TABLE IF NOT EXISTS "+
                "app_preferences ("+
                "pref_key TEXT NOT NULL,"+
                "pref_value TEXT NOT NULL,"+
                "PRIMARY KEY(pref_key));";
        sqLiteDatabase.execSQL(sqlCreatePreferences);
    }

}

 This is java class in Radio Walkman application.

Flow Diagram Radio Walkman

 

Java 17 JList using ListModel and JComboBox using BasicComboBoxRenderer to wrap data (hide id)

Source code: 

com.dedetok.tutorialcustomjlist.Person.java

package com.dedetok.tutorialcustomjlist;

public class Person {
    int id;
    String name;
    
    public Person(int id, String name) {
        this.id = id;
        this.name = name;
    }
}

com.dedetok.tutorialcustomjlist.MyListModel.java

package com.dedetok.tutorialcustomjlist;

import java.util.Vector;
import javax.swing.ListModel;
import javax.swing.event.ListDataListener;

public class MyListModel implements ListModel<String> {
    Vector<Person> myData = new Vector<>();

    public MyListModel(Vector<Person> myData) {
        this.myData = myData;
    }
    
    @Override
    public int getSize() {
        return myData.size();
    }

    // to render in JList
    @Override
    public String getElementAt(int index) {
        Person tmpP = myData.get(index);
        return tmpP.name;
    }

    @Override
    public void addListDataListener(ListDataListener l) {
        // TODO Auto-generated method stub
       
    }

    @Override
    public void removeListDataListener(ListDataListener l) {
        // TODO Auto-generated method stub
       
    }

}

com.dedetok.tutorialcustomjlist.MyCBRenderer.java

package com.dedetok.tutorialcustomjlist;

import java.awt.Component;

import javax.swing.JList;
import javax.swing.plaf.basic.BasicComboBoxRenderer;

public class MyCBRenderer extends BasicComboBoxRenderer {

    // to render to JComboBox
    @Override
    public Component getListCellRendererComponent(JList<?> list, Object value, int index, boolean isSelected,
            boolean cellHasFocus) {
        // TODO Auto-generated method stub
        super.getListCellRendererComponent(list, value, index, isSelected,
            cellHasFocus);
        Person mPerson = (Person) value;
        setText(mPerson.name);
        return this;
    }
}

com.dedetok.tutorialcustomjlist.TutorialJList.java

package com.dedetok.tutorialcustomjlist;

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Vector;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.SpringLayout;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.JComboBox;

public class TutorialJList {

    private JFrame frame;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    TutorialJList window = new TutorialJList();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public TutorialJList() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        frame = new JFrame();
        frame.setBounds(100, 100, 450, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        SpringLayout springLayout = new SpringLayout();
        frame.getContentPane().setLayout(springLayout);
       
        Vector<Person> myList = new Vector<>();
        Person tmp = new Person(1,"one");
        myList.add(tmp);
        tmp = new Person(2,"two");
        myList.add(tmp);
        tmp = new Person(3,"Three");
        myList.add(tmp);
       
        MyListModel myDataList = new MyListModel(myList); // implements ListModel<String>
       
        JList<String> list = new JList<>(myDataList);
        list.addListSelectionListener(new ListSelectionListener( ) {

            @Override
            public void valueChanged(ListSelectionEvent e) {
                // TODO Auto-generated method stub
                if (!e.getValueIsAdjusting()) {
                    int selectInt = list.getSelectedIndex();
                    Person tmpP = myDataList.myData.get(selectInt);
                    System.out.println(tmpP.id+" "+tmpP.name);
                }
            }
           
        });


        springLayout.putConstraint(SpringLayout.NORTH, list, 0, SpringLayout.NORTH, frame.getContentPane());
        springLayout.putConstraint(SpringLayout.WEST, list, 0, SpringLayout.WEST, frame.getContentPane());
        springLayout.putConstraint(SpringLayout.EAST, list, 436, SpringLayout.WEST, frame.getContentPane());
        frame.getContentPane().add(list);

        JComboBox<Person> comboBox = new JComboBox<>(myList);
        MyCBRenderer myCBRenderer = new MyCBRenderer();
        comboBox.setRenderer(myCBRenderer);
        ActionListener myAL = new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO Auto-generated method stub
                Person myPerson = (Person) comboBox.getSelectedItem();
                System.out.println(myPerson.id+" "+myPerson.name);
            }
           
        };
        comboBox.addActionListener(myAL);

        springLayout.putConstraint(SpringLayout.WEST, comboBox, 0, SpringLayout.WEST, list);
        springLayout.putConstraint(SpringLayout.SOUTH, comboBox, 0, SpringLayout.SOUTH, frame.getContentPane());
        frame.getContentPane().add(comboBox);
       
    }
}

Privacy Policy for Pitra Puja (com.dedetok.pitrapuja)

Privacy Statement

Your privacy is important to us. This privacy statement explains what Pitra Puja (com.dedetok.pitrapuja) application does, regarding your personal data.

Personal data we collect

Pitra Puja (com.dedetok.pitrapuja) application does not requesting any information about your personal data. But this application use 3^rd Party SDK, see 3^rd Party SDK Collection section. This 3^rd party SDK are beyond our control.

Network & Internet Connection:

Pitra Puja (com.dedetok.pitrapuja) application does not mandatory to use internet connection. You can use Pitra Puja (com.dedetok.pitrapuja) application without Internet connection.

If Internet connection exist, Pitra Puja (com.dedetok.pitrapuja) application will use it to serving for Google AdMob only.

3^rd Party Data Collection:

Pitra Puja (com.dedetok.pitrapuja) application use Mobile Ads SDK (Android). Refer to https://developers.google.com/admob/android/privacy/play-data-disclosure, Mobile Ads SDK (Android) will collect your:

1. IP address: Collects device's IP address, which may be used to estimate the general location of a device.

2. User product interactions: Collects user product interactions and interaction information, including app launch, taps, and video views.

3. Diagnostic information: Collects information related to the performance of your app and the SDK, including crash logs, app launch time, hang rate, and energy usage.

4. Device and Account identifiers: Collects Android advertising (ad) ID, app set ID, and, if applicable, other identifiers related to signed-in accounts on the device.

Contact Us:

If You need to contact Us, here is My email address:

dedetoke2021@gmail.com

Android java source code com.dedetok.turuntirta

This is source code for com.dedetok.turuntirta and com.dedetok.bramara. I keep using legacy MediaPlayer.

Put turuntirta.mp3 in folder [Workspace]/Wargasari/app/src/main/res/raw/

build.gradle.kts (Module: app)

plugins {
    id("com.android.application")
}

android {
    namespace = "com.dedetok.turuntirta"
    compileSdk = 34

    defaultConfig {
        applicationId = "com.dedetok.turuntirta"
        minSdk = 24
        targetSdk = 34
        versionCode = 202402
        versionName = "2024.02"

        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            isMinifyEnabled = false
            proguardFiles(
                getDefaultProguardFile("proguard-android-optimize.txt"),
                "proguard-rules.pro"
            )
        }
    }
    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8
    }
}

dependencies {

    implementation("androidx.appcompat:appcompat:1.6.1")
    implementation("com.google.android.material:material:1.11.0")
    implementation("androidx.constraintlayout:constraintlayout:2.1.4")
    testImplementation("junit:junit:4.13.2")
    androidTestImplementation("androidx.test.ext:junit:1.1.5")
    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
    implementation("com.google.android.gms:play-services-ads-lite:23.0.0")
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">
    <!-- For apps targeting Android 13 or higher & GMA SDK version 20.3.0 or lower -->
    <uses-permission android:name="com.google.android.gms.permission.AD_ID"/>
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

    <!-- permission for media player -->
    <uses-permission android:name="android.permission.WAKE_LOCK" />

    <!-- android:enableOnBackInvokedCallback="true" Back Pressed Target API level>33 -->
    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/my_ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/my_ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.TurunTirta"
        tools:targetApi="31"
        android:enableOnBackInvokedCallback="true"
        >
        <activity
            android:name=".MainActivity"
            android:exported="true"
            android:configChanges="orientation|screenSize"
            >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <!-- Sample AdMob app ID: ca-app-pub-3940256099942544~3347511713 -->
        <!-- AD App ID: ca-app-pub-0220748109202708~7061470683 : AndroidManifest.xml -->
        <meta-data
            android:name="com.google.android.gms.ads.APPLICATION_ID"
            android:value="ca-app-pub-0220748109202708~7061470683"
            />
    </application>

</manifest>

res -> values -> strings.xml

<resources>
    <string name="app_name" translatable="false">Kidung Turun Tirta</string>

    <string-array name="kidung">
        <item>Turun tirta saking luhur|\nMenyiratan pemangkune|\nMekalangan muncrat mumbul|\nMapan tirtha merta jati|\nPaican Bhatara sami|\nPanglukatan dasa mala|\nSami pada lebur|\nMalene ring gumi||</item>
        <item>Meketis ping tiga sampun|\nPabahan Siwa dwarane|\nWasuhane raris kinum|\nPing tiga lantas mesugi|\nRing waktra megentos genti|\nToya amertha Hyang Widhine|\nSami sampun puput|\nMengalangin hati||</item>
    </string-array>

    <array name="my_font_size">
        <item>18</item>
        <item>24</item>
        <item>32</item>
        <item>42</item>
    </array>
    <string name="dialog_title">Exit Application</string>
    <string name="dialog_message">Do you want to exit application?</string>
    <string name="play_pause">Play/Pause</string>
    <string name="zoom_in">Zoom In</string>
    <string name="zoom_out">Zoom Out</string>
    <string name="bait">Stanza</string>
    <string name="play_repeat">Repeat play</string>

</resources>

res -> values -> ic_launcher_background.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="ic_launcher_background">#FFFFFF</color>
</resources>

res -> Layout -> layout_stanza.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    >

    <androidx.appcompat.widget.AppCompatTextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/stanza_title"
        android:textColor="#9C27B0"
        />
    <androidx.appcompat.widget.AppCompatTextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/stanza_content"
        />

</androidx.appcompat.widget.LinearLayoutCompat>

res -> Layout -> activity_main.xml

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical"
    >

    <androidx.appcompat.widget.LinearLayoutCompat
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >

        <androidx.appcompat.widget.AppCompatButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/b_zoom_in"
            android:text="@string/zoom_in"
            />
        <androidx.appcompat.widget.AppCompatButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/b_zoom_out"
            android:text="@string/zoom_out"
            />
    </androidx.appcompat.widget.LinearLayoutCompat>

    <androidx.recyclerview.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/my_recycler_view"
        android:scrollbars="vertical"
        android:layout_weight="1"
        />

    <androidx.appcompat.widget.AppCompatSeekBar
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/my_seekbar"
        />

    <androidx.appcompat.widget.LinearLayoutCompat
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_gravity="center">
        <androidx.appcompat.widget.AppCompatImageButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/my_play"
            android:src="@android:drawable/ic_media_play"
            android:layout_gravity="center_horizontal"
            android:contentDescription="@string/play_pause"
            />
        <androidx.appcompat.widget.SwitchCompat
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/switch_repeat"
            android:layout_gravity="center_horizontal"
            android:contentDescription="@string/play_repeat"
            android:text="@string/play_repeat"
            />
    </androidx.appcompat.widget.LinearLayoutCompat>

    <!-- Sample AdMob unit ID: ca-app-pub-3940256099942544/6300978111 -->
    <!-- AD Unit ID: ca-app-pub-0220748109202708/8538203883 : layout -->
    <com.google.android.gms.ads.AdView
        android:id="@+id/adView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:adSize="BANNER"
        android:layout_gravity="end|center"
        app:adUnitId="ca-app-pub-0220748109202708/8538203883"
        />
</androidx.appcompat.widget.LinearLayoutCompat>

java -> StanzaContainer.java

package package com.dedetok.wargasari;;

public class StanzaContainer {

    public String stanzaTitle;
    public String stanzaContent;

    public StanzaContainer(String stanzaTitle, String stanzaContent) {
        this.stanzaTitle = stanzaTitle;
        this.stanzaContent = stanzaContent;

    }
}

java -> MyAdapter.java

package com.dedetok.wargasari;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.appcompat.widget.AppCompatTextView;
import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;

public class MyAdapter extends RecyclerView.Adapter  {

    ArrayList<StanzaContainer>  myStanza;

    int myUnitTextSize;
    float myTextSize;

    public MyAdapter(ArrayList<StanzaContainer> myStanza, int unit, float size) {
        this.myStanza = myStanza;
        this.myUnitTextSize = unit;
        this.myTextSize = size;

    }

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

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
        StanzaContainer myTmpStanza = myStanza.get(position);
        ((MyHolder) holder).stanzaTitle.setText(myTmpStanza.stanzaTitle);
        ((MyHolder) holder).stanzaTitle.setTextSize(myUnitTextSize, myTextSize);
        ((MyHolder) holder).stanzaContent.setText(myTmpStanza.stanzaContent);
        ((MyHolder) holder).stanzaContent.setTextSize(myUnitTextSize, myTextSize);
    }

    @Override
    public int getItemCount() {
        return myStanza.size();
    }

    public void changeFontSize(int unit, float size) {
        this.myUnitTextSize = unit;
        this.myTextSize = size;
        notifyDataSetChanged();
    }

    private class MyHolder extends RecyclerView.ViewHolder {

        public AppCompatTextView stanzaTitle, stanzaContent;

        public MyHolder(@NonNull View itemView) {
            super(itemView);

            stanzaTitle = itemView.findViewById(R.id.stanza_title);
            stanzaContent = itemView.findViewById(R.id.stanza_content);
        }
    }
}

java -> MainActivity.java

package com.dedetok.turuntirta;

import static android.util.TypedValue.COMPLEX_UNIT_SP;
import androidx.activity.OnBackPressedCallback;
import androidx.activity.OnBackPressedDispatcher;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.AppCompatButton;
import androidx.appcompat.widget.AppCompatImageButton;
import androidx.appcompat.widget.AppCompatSeekBar;
import androidx.appcompat.widget.SwitchCompat;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.DialogInterface;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.PowerManager;
import android.view.View;
import android.widget.CompoundButton;
import android.widget.SeekBar;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
import java.util.ArrayList;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class MainActivity extends AppCompatActivity {

    MediaPlayer myMediaPlayer = null;
    AppCompatSeekBar mySeekBar;
    int cTextSizeState = 0;
    TypedArray availFontSize;
    float defaultTextSize = 18;
    boolean myPlayerStatus = false;
    private Bundle myBundle;
    private int myCurrentPos =0;
    static final String STATE_MY_PLAYER_STATUS = "currentStatus";
    static final String STATE_MY_PLAYER_POSITION = "currentPosition";
    AppCompatImageButton myPlayButton; //20240302
    // handler to update seekbar
    final Handler myHandler = new Handler(Looper.getMainLooper()); // new Handler() deprecated 20240302

    //20240423
    PowerManager.WakeLock wakeLock;

    /*
     * ## activity life cycle 1 ##
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // add version number from gradle into activity title
        try {
            PackageInfo myPackage = getPackageManager().getPackageInfo(getPackageName(),0);
            String myTitle =  getString(R.string.app_name)+" "+myPackage.versionName;
            setTitle(myTitle);
        } catch (PackageManager.NameNotFoundException e) {
            // Do Nothing, pass process
        }

        // ads:adUnitId ca-app-pub-0220748109202708/8538203883 : AdView in Layout
        // app id ca-app-pub-0220748109202708~7061470683    : AndroidManifest.xml
        AdView mAdView = findViewById(R.id.adView);
        AdRequest adRequest = new AdRequest.Builder().build();
        mAdView.loadAd(adRequest);

        // Button Play 20240302
        myPlayButton = findViewById(R.id.my_play);
        myPlayButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (myPlayerStatus) {
                    // pause
                    pauseMedia();
                } else {
                    // play
                    playMedia();
                }
            }
        });

        // seekbar
        mySeekBar = findViewById(R.id.my_seekbar);
        mySeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int myProgress, boolean isFromUser) {

                if (isFromUser) {
                    if (myMediaPlayer!=null) {
                        myMediaPlayer.seekTo(myProgress);
                    }
                }
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                // DO NOTHING
            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                // DO NOTHING
            }
        });

        // recyclerview
        availFontSize = getResources().obtainTypedArray(R.array.my_font_size);
        RecyclerView myRecyclerView = findViewById(R.id.my_recycler_view);
        LinearLayoutManager myLinearLayout = new LinearLayoutManager(getApplicationContext());
        myLinearLayout.setOrientation(LinearLayoutManager.VERTICAL);
        myRecyclerView.setLayoutManager(myLinearLayout);
        MyAdapter myAdapter = new MyAdapter(getTexts(), COMPLEX_UNIT_SP, availFontSize.getFloat(cTextSizeState, defaultTextSize));
        myRecyclerView.setAdapter(myAdapter);

        // button zoom text
        AppCompatButton bZoomOut = findViewById(R.id.b_zoom_out);
        bZoomOut.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (cTextSizeState==0) {
                    //Log.i("Font Change", "Zoom out do nothing");
                }  else {
                    cTextSizeState--;
                    myAdapter.changeFontSize(COMPLEX_UNIT_SP,availFontSize.getFloat(cTextSizeState, defaultTextSize));
                    //Log.i("Font Change", Float.toString(availFontSize.getFloat(cTextSizeState,defaultTextSize)));
                }
            }
        });
        AppCompatButton bZoomIn = findViewById(R.id.b_zoom_in);
        bZoomIn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (cTextSizeState+1==availFontSize.length()) {
                    //Log.i("Font Change", "Zoom in do nothing");
                }  else {
                    cTextSizeState++;
                    myAdapter.changeFontSize(COMPLEX_UNIT_SP,availFontSize.getFloat(cTextSizeState, defaultTextSize));
                    //Log.i("Font Change", Float.toString(availFontSize.getFloat(cTextSizeState,defaultTextSize)));
                }
            }
        });

        // to save state if user switch to / from other application
        myBundle = savedInstanceState; // added multimedia

        // onBackPressed() deprecated -> OnBackPressedCallback & getOnBackPressedDispatcher()
        // dispatcher
        OnBackPressedDispatcher myOnbackPressedDispatcher = getOnBackPressedDispatcher();
        // callback on back key pressed
        OnBackPressedCallback myBackPressedCallback = new OnBackPressedCallback(true) {
            @Override
            public void handleOnBackPressed() {
                // Log.e("dedetok", "handleOnBackPressed()"); //debug
                AlertDialog.Builder myAlertDialog = new AlertDialog.Builder(
                        MainActivity.this);
                myAlertDialog.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();

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

        //20240422
        SwitchCompat sRepeat = findViewById(R.id.switch_repeat);
        sRepeat.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean booleanRepeat) {
                //myDataProvider.setRepeat(booleanRepeat);
                if (myMediaPlayer!=null) {
                    myMediaPlayer.setLooping(booleanRepeat);
                }
            }
        });

    }

    // ## activity life cycle 2 ##
    // onStart() 20240302
    @Override
    protected void onStart() {
        super.onStart();
        // 20240423
        // Android N (7.0) or latter MediaPlayer should create in OnStart
        // Media Player
        // preparing mediaplayer
        // no need to call prepare(); create() does that for you
        if (myMediaPlayer==null) {
            myMediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.turuntirta);
        }
        myMediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mediaPlayer) {
                // seekbar at start and stop thread
                myPlayerStatus = mediaPlayer.isPlaying();
                myCurrentPos=0;
                mySeekBar.setProgress(myCurrentPos);
                if (!myMediaPlayer.isLooping()) {
                    pauseMedia();
                }
            }
        });
    }

    /*
     * ## activity life cycle 3 ## 20240302
     *    activity process 3
     *    onResume()
     *    @Override onRestoreInstanceState(Bundle savedInstanceState) ?
     */
    @Override
    public void onResume() {
        super.onResume();

        loadMyState();
        // link mySeekbar to myPlayer
        mySeekBar.setMax(myMediaPlayer.getDuration());
        if (myPlayerStatus && !myMediaPlayer.isPlaying()) {
            playMedia();
        }
        if (myMediaPlayer.isPlaying()) {
            myMediaPlayer.seekTo(myCurrentPos);
        }
    }

    /*
     * ## activity life cycle 4 ## 20240302
     * onPause()
     * @Override onSaveInstanceState(Bundle outState) ?
     */
    @Override
    public void onPause() {
        super.onPause();
    }

    // ## activity life cycle 5 ## 20240302
    @Override
    protected void onStop() {
        saveMyState();

        // 20240213
        // Android N (7.0) or latter MediaPlayer should stop and release in OnStop
        // we meed to keep play media even if screen does not on top
        // move release resource to onDestroy()
        super.onStop();

    }

    /*
     * ## activity life cycle 5 ## 20240302
     * clean up onDestroy()
     */
    @Override
    public void onDestroy() {
        //Log.e("dedetok","onDestroy Activity"); //debug

        // 20240423
        // release all media resources
        // release lock and executor include in funcion pauseMedia()
        pauseMedia();
        if (myMediaPlayer != null) {
            myMediaPlayer.release();
            myMediaPlayer = null;
        }

        super.onDestroy();

    }

    /* 20240302
     * onConfigurationChanged Called:
     * - after orientation change
     */
    @Override
    public void onConfigurationChanged(@NonNull Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        // DO NOTHING
    }

    /* 20240302
     * onSaveInstanceState Called:
     * - after switch to other application
     * - after onConfigurationChanged
     */
    @Override
    protected void onSaveInstanceState(@NonNull Bundle outState) {
        super.onSaveInstanceState(outState);
        //Log.e("dedetok", "onSaveInstanceState"); // debug
        // TODO save something
    }

    /* 20240302
     * onRestoreInstanceState Called:
     * - after back to application
     * - after onConfigurationChanged
     */
    @Override
    protected void onRestoreInstanceState(@NonNull Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        //Log.e("dedetok", "onRestoreInstanceState"); // debug
        // TODO save something

    }

    private ArrayList<StanzaContainer> getTexts() {
        String[] kidung = getResources().getStringArray(R.array.kidung);
        int numKidung = kidung.length;
        ArrayList<StanzaContainer> myStanza = new ArrayList<StanzaContainer>();
        for (int i=0;i<numKidung; i++) {
            int j=i+1;
            String stanzaTitle = getString(R.string.bait)+" "+j;
            StanzaContainer myTmpStanza = new StanzaContainer(stanzaTitle, kidung[i]);
            myStanza.add(myTmpStanza);
        }
        //Log.i("array",Integer.toString(kidunglist.length));
        return myStanza;
    }

    /*
     * to load state
     */
    void loadMyState() {
        if (myBundle != null) {
            super.onRestoreInstanceState(myBundle);
            // Save the user's current media player state
            myCurrentPos = myBundle.getInt(STATE_MY_PLAYER_POSITION);
            myPlayerStatus = myBundle.getBoolean(STATE_MY_PLAYER_STATUS);
        }
    }


    /*
     * to save state
     */
    void saveMyState() {
        if (myBundle != null) {
            myBundle.putInt(STATE_MY_PLAYER_POSITION, myCurrentPos);
            myBundle.putBoolean(STATE_MY_PLAYER_STATUS, myPlayerStatus);
            super.onSaveInstanceState(myBundle);
        }
    }

    // 20240302
    void playMedia() {
        //Log.e("dedetok", "playMedia create execcutor"); // debugg
        executor = Executors.newSingleThreadExecutor();

        //Log.e("dedetok", "playMedia wakelock and start"); // debugg

        // 20240423
        // try to get WAKE_LOCK
        if (wakeLock==null) {
            PowerManager powerManager = (PowerManager) getSystemService(POWER_SERVICE);
            wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
                    "MyApp::com.dedetok.turuntirta");
        }
        wakeLock.acquire();
        myMediaPlayer.setWakeMode(this, PowerManager.PARTIAL_WAKE_LOCK);
        myMediaPlayer.start();

        // set icon to pause
        myPlayButton.setImageResource(android.R.drawable.ic_media_pause);
        myPlayerStatus = myMediaPlayer.isPlaying();

        //Log.e("dedetok", "playMedia seekbar"); // debugg

        // update seekbar TODO CRASH
        executor.submit(mySeekbarUpdater);
    }

    // 20240302
    void pauseMedia() {
        //Log.e("dedetok", "pauseMedia pause"); // debugg
        myMediaPlayer.pause();
        // set icon to play
        myPlayButton.setImageResource(android.R.drawable.ic_media_play);
        myPlayerStatus = myMediaPlayer.isPlaying();

        //Log.e("dedetok", "pauseMedia waklock release"); // debugg

        // 20240423
        // try to release WAKE_LOCK
        if (wakeLock!=null) {
            wakeLock.release();
        }
        //Log.e("dedetok", "pauseMedia executor release"); // debugg
        if (executor!=null) {
            executor.shutdown();
        }
    }

    /* 20240302
     * Thread to update seekbar during mediaplayer run
     */
    ExecutorService executor = Executors.newSingleThreadExecutor();
    Runnable mySeekbarUpdater = new Runnable() {
        @Override
        public void run() {
            if (myMediaPlayer!=null) {
                if (myMediaPlayer.isPlaying()) {
                    myCurrentPos = myMediaPlayer.getCurrentPosition();
                    mySeekBar.setProgress(myCurrentPos);
                    myHandler.postDelayed(this, 500); // 500 millisecond
                }
            }
        }
    };
}