Fail to build running this app in flutter.

[jja08111]

I want to make alarm app that is my first app, so I would like to refer to your application.

But build failed..
I've changed the AlarmBroadcastReceiver.java.

The error code is here.

C:\flutter\.pub-cache\hosted\pub.dartlang.org\android_alarm_manager-0.4.5+15\android\src\main\java\io\flutter\plugins\androidalarmmanager\AlarmBroadcastReceiver.java:20: warning: [deprecation] SCREEN_DIM_WAKE_LOCK in PowerManager has been deprecated
    wakeLock = powerManager.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK |
                                                    ^
error: warnings found and -Werror specified
1 error
1 warning

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':android_alarm_manager:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 5s
Exception: Gradle task assembleDebug failed with exit code 1

How to debug this error?

[jja08111]

I find a solution by searching the PowerManger.java file.

Solution is change PowerManager.SCREEN_DIM_WAKE_LOCK to 0x00000006 in AlarmBroadcastReceiver.java.
Because SCREEN_DIM_WAKE_LOCK is @Deprecated.

[geisterfurz007]

Hey there! Thanks for letting me know! I will see if I can make use of the API suggested in the deprecation notice and comment on the original issue the file was taken from 👍

[jja08111]

Use WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON instead of 0x00000006

[geisterfurz007]

Good to know, thanks!

[KodPlanet]

Use WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON instead of 0x00000006

Hi Minseong,
I am also trying to build an alarm app and trying to implement AlarmManager for days. I saw your questions on stackoverflow and finally find this repo ( thanks also to geisterfurz :) for this contribution ).

android_alarm_manager package is updated to 2.0.0 and I can not modify AlarmBroadcastReceiver.java as mentioned above.

I downloaded your BedTime app and looks like you somehow managed to run app from background service.
Which version of android_alarm_manager are you using?

Moreover,
Is it possible reach you to discuss latest solutions you are using, and about your experience ?

[jja08111]

Hi @KodPlanet

I'm using the ^2.0.0 version in my app.
I don't know why you can not modify the AlarmBroadcastReceiver.java.
In my case, open the project and find the android_alarm_manager-2.0.0 in the External Libraries/Flutter Plugins. And find AlarmBroadcastReceiver.java, copy-paste!

Here is the code that I used.

AlarmBroadcastReceiver.java

// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
     
package io.flutter.plugins.androidalarmmanager;
     
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.PowerManager;
import android.content.pm.PackageManager;
import android.view.WindowManager;
     
public class AlarmBroadcastReceiver extends BroadcastReceiver {
  private static PowerManager.WakeLock wakeLock;
     
  @Override
  public void onReceive(Context context, Intent intent) {
    PowerManager powerManager = (PowerManager)
            context.getSystemService(Context.POWER_SERVICE);
    wakeLock = powerManager.newWakeLock(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON |
            PowerManager.ACQUIRE_CAUSES_WAKEUP |
            PowerManager.ON_AFTER_RELEASE, "My wakelock");
     
    Intent startIntent = context
            .getPackageManager()
            .getLaunchIntentForPackage(context.getPackageName());
     
    startIntent.setFlags(
            Intent.FLAG_ACTIVITY_REORDER_TO_FRONT |
                    Intent.FLAG_ACTIVITY_NEW_TASK |
                    Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED
    );
     
    wakeLock.acquire();
    context.startActivity(startIntent);
    AlarmService.enqueueAlarmProcessing(context, intent);
  wakeLock.release();
  }
}

There is a need for permissions (#18) to fire the alarm from the background.

And I'm using geisterfurz007's alarm app system.
To describe it a bit,

1. alarm fired and callback function called
2. write the flag file(in my case, using shared_preference)
3. run polling worker that finds flag file
   • if exist flag file change the state to alarm on, else don't change the state.

I had a hard time building an alarm system with Flutter. I hope this helps you.