android BroadcastReceiver doesn't initiliaze

Question

I am trying to use broadcastreceiver with alarm manager but unfortunately it doesnt work on my phone (android 10). broadcastReceiver doesnt initiliaze. if someone help me, I will appriciate him/her

BroadcastReceiver Class

`public class Alarm extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context,"Wake up",Toast.LENGTH_LONG).show();
        Log.i("fffffgggg", "onReceive: reached broadcast");
        MediaPlayer mediaPlayer=MediaPlayer.create(context, Settings.System.DEFAULT_RINGTONE_URI);
        mediaPlayer.start();
    }`

manifest for receiver

 <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <receiver android:name=".Alarm" android:exported="true" android:enabled="true">

        </receiver>
    </application>

MainActivity class

  @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        AlarmManager alarm = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        Intent notifyintent = new Intent(MainActivity.this, Alarm.class);
        PendingIntent pIntent = PendingIntent.getBroadcast(MainActivity.this, 0, notifyintent, 0);

        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
//update 30 seconds
        alarm.setInexactRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),30*1000, pIntent);
    }

score 0 · Answer 1 · answered Mar 05 '21 at 18:50

You need to decide for action (some string), configure your broadcast receiver to process that action, and create a pending intent that fires that action.

It goes like this.

Manifest:

 <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <receiver android:name=".Alarm" android:exported="true" android:enabled="true">
           <intent-filter>
                <action android:name="MY_ACTION" />
            </intent-filter>
        </receiver>
    </application>

Main activity:

  @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        AlarmManager alarm = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        Intent notifyintent = new Intent("MY_ACTION");
        PendingIntent pIntent = PendingIntent.getBroadcast(MainActivity.this, 0, notifyintent, 0);

        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
//update 30 seconds
        alarm.setInexactRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),30*1000, pIntent);
    }

Also, it's recommended to make sure you got the right action in onReceive function.

Shlomi Katriel thanks for your reply but problem seems different here. adding action to intent is probably help to handle different or multiple broadcastreceivers. Now I tried 'alarm.setExact(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), pIntent); ' it is working. I cant use setRepeating or setExacRepeating methods — Abdullah, Mar 05 '21 at 19:15
Hi, I believe broadcast receivers only processes actions so you must set the action in the intent you fire and configure your manifest accordingly. About the other thing, have you tried `AlarmManager#setInexactRepeating`? See https://developer.android.com/training/scheduling/alarms#examples-of-elapsed-real-time-alarms — Shlomi Katriel, Mar 05 '21 at 19:18
adding action may help to get spesific action in broadcastreceiver but look like it is not necessary to use — Abdullah, Mar 05 '21 at 19:22

score 0 · Answer 2 · answered Mar 05 '21 at 20:27

0

AlarmManager is using Pending Intent as base. Pending intent it is a intent modification so for the first you must define action in your manifest, and give that value to Pending intent. For more detail you can read alarm manager google documentation, I hope I've been of help.

answered Mar 05 '21 at 20:27

Rob Gas

56
4

hi Rob Gas thanks for your answer. this issue is terribile. I found that battery optimization prevents setInexactRepeating and setRepeating working. when I disable battery optimization for my app and add REQUEST_IGNORE_BATTERY_OPTIMIZATIONS permission to manifest, I sarted to get messages from my broadcastReceiver repeatively https://www.debugcn.com/en/article/22807634.html article mentions the issue – Abdullah Mar 05 '21 at 20:48

android BroadcastReceiver doesn't initiliaze

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