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 

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)
    }

 

 

 

 

Debian 13: using systemd timesync to update ntp client time

Since Debain Jessie, Debian use systemd to synchronize ntp clinet

To list timezone:

# timedatectl list-timezones | grep Jakarta
Asia/Jakarta

To set timezone:

# timedatectl set-timezone Asia/Jakarta

To show

# timedatectl 
               Local time: Mon 2026-01-12 12:44:27 WIB
           Universal time: Mon 2026-01-12 05:44:27 UTC
                 RTC time: Mon 2026-01-12 05:44:27
                Time zone: Asia/Jakarta (WIB, +0700)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

Edit /etc/systemd/timesyncd.conf

...
[Time]
#NTP=
NTP=0.id.pool.ntp.org 1.id.pool.ntp.org 2.id.pool.ntp.org 2.id.pool.ntp.org 3.id.pool.ntp.org
#FallbackNTP=0.debian.pool.ntp.org 1.debian.pool.ntp.org 2.debian.pool.ntp.org 3.debian.pool.ntp.org
...

To restart service

# systemctl restart systemd-timesyncd

you can use old way using ntp client, but you need to remove this package

# timedatectl set-ntp false

Now you can install ntp and edit configuration /etc/ntp.conf.