Android中的Broadcast Reciever與Intent.ACTION_BATTERY_CHANGED不在後臺工作

我正在開發一個android應用程序，我必須通過廣播接收器獲取電池電量，並在電池更換時在後臺顯示烤麪包。我已經註冊了接收方和意向過濾器以獲取該值。Android中的Broadcast Reciever與Intent.ACTION_BATTERY_CHANGED不在後臺工作

它在應用程序打開時運行良好，但在應用程序關閉時它不提供值。

請建議我應該以與背景值運行敬酒時做應用程序被關閉

public class MainActivity extends Activity { 
private TextView batteryPercent; 
int level; 
private void getBatteryPercentage() { 
BroadcastReceiver batteryLevelReceiver = new BroadcastReceiver() { 
    public void onReceive(Context context, Intent intent) { 
     context.unregisterReceiver(this); 
     int currentLevel = intent.getIntExtra(BatteryManager.EXTRA_LEVEL,-1); 
     int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1); 
     level = -1; 
     if (currentLevel >= 0 && scale > 0) { 
      level = (currentLevel * 100)/scale; 
     } 
     batteryPercent.setText("Battery Level Remaining: " + level + "%"); 


     CountDownTimer cdt = new CountDownTimer(5000, 1000) { 

      public void onTick(long millisUntilFinished) {   

      } 

      public void onFinish() { 

       Toast.makeText(getApplicationContext(),"Level "+Integer.toString(level), 
          Toast.LENGTH_LONG).show(); 
       ;      
      } 

      } 
      .start(); 
    } 
}; 
IntentFilter batteryLevelFilter = new   IntentFilter(Intent.ACTION_BATTERY_CHANGED); 
registerReceiver(batteryLevelReceiver, batteryLevelFilter); 
} 

/* @Override*/ 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    batteryPercent = (TextView) this.findViewById(R.id.batteryLevel); 
    getBatteryPercentage(); 
}

塊引用

來源

2015-09-10 Android Developer

您必須註冊了相同的廣播接收器Manifest擁有自己的分類像這樣。

<BroadcastReceiver 
      android:name = "class name"> 
      <intent-filter> 
       <action android:name = " your action here"/> 
      </intent-filter> 
</BroadcastReceiver>

在這種情況下你的行動是Intent.ACTION_BATTERY_CHANGED因此代碼將

<BroadcastReceiver 
      android:name = "class name"> 
      <intent-filter> 
       <action android:name = "Intent.ACTION_BATTERY_CHANGED"/> 
      </intent-filter> 
</BroadcastReceiver>

希望這有助於你

來源

2015-09-10 17:31:07

Android中的Broadcast Reciever與Intent.ACTION_BATTERY_CHANGED不在後臺工作

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