服務檢查電池百分比Android

Question

我想檢查電池的百分比，我創建一個服務，但我怎麼能確定什麼是電池的百分比，並做了什麼，當它來到例如20％？

Answer 1

試試這個：

private void batteryLevel() { 
    BroadcastReceiver batteryLevelReceiver = new BroadcastReceiver() { 
     public void onReceive(Context context, Intent intent) { 
      context.unregisterReceiver(this); 
      int rawlevel = intent.getIntExtra("level", -1); 
      int scale = intent.getIntExtra("scale", -1); 
      int level = -1; 
      if (rawlevel >= 0 && scale > 0) { 
       level = (rawlevel * 100)/scale; 
      } 
      mBtn.setText("Battery Level Remaining: " + level + "%"); 
     } 
    }; 
IntentFilter batteryLevelFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED); 
    registerReceiver(batteryLevelReceiver, batteryLevelFilter); 
} 

Answer 2

請參閱android開發的官方網頁。 https://developer.android.com/training/monitoring-device-state/battery-monitoring.html