安卓：AlarmManager不會觸發報警事件

我想我的應用程序執行一些工作periodically.To做到這一點我使用AlarmManager，但由於某種原因，它不會觸發任何事件。清單XML：安卓：AlarmManager不會觸發報警事件

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="test.user.alarm_test"> 

    <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=".MyActivity"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
     <receiver android:name=".AlarmReceiver" android:enabled="true"> 
     </receiver> 
    </application> 

</manifest>

活動代碼：

public class MyActivity extends AppCompatActivity { 
private PendingIntent pendingIntent; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_my); 

    /* Retrieve a PendingIntent that will perform a broadcast */ 
    Intent alarmIntent = new Intent(MyActivity.this, AlarmReceiver.class); 
    pendingIntent = PendingIntent.getBroadcast(MyActivity.this, 0, alarmIntent, 0); 

    findViewById(R.id.startAlarm).setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      start(); 
     } 
    }); 

    findViewById(R.id.stopAlarm).setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      cancel(); 
     } 
    }); 
} 

public void start() { 
    AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE); 
    int interval = 5000; 
    //schedule alarm to fire every 5 seconds 
    manager.setInexactRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, System.currentTimeMillis()+interval, interval, pendingIntent); 
    Toast.makeText(this, "Alarm Set", Toast.LENGTH_SHORT).show(); 
} 

public void cancel() { 
    AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE); 
    manager.cancel(pendingIntent); 
    Toast.makeText(this, "Alarm Canceled", Toast.LENGTH_SHORT).show(); 
} 
}

報警接收器：

public class AlarmReceiver extends BroadcastReceiver { 

@Override 
public void onReceive(Context context, Intent intent) { 

    // For our recurring task, we'll just display a message 
    Toast.makeText(context, "I'm running", Toast.LENGTH_SHORT).show(); 
} 
}

UPD：我發現manager.setInexactRepeating(AlarmManager.RTC, System.currentTimeMillis()+interval, interval, pendingIntent);（RTC代替ELAPSED_REALTIME_WAKEUP）的作品更好，但現在它只調用的onReceive一次。

來源

2017-08-11 undefined

您的清單中的接收器缺少操作字段 –

需要向接收器添加什麼操作？我在Google的文檔中看不到任何提示https://developer.android.com/training/scheduling/alarms.html – undefined

我的錯誤android不會讓創建警報事件的頻率低於每60秒一次。所以我只需要等待一段時間。

來源

2017-08-11 12:56:07 undefined

安卓：AlarmManager不會觸發報警事件

回答

相關問題