我正在構建有關電池指示燈的應用程序,我正在使用該帖子中的代碼。廣播接收器無法在前臺或活動應用程序上工作
Getting battery status even when the application is closed
它工作正常,當應用程序被關閉,但是當一個應用程序被激活或前臺沒有工作或沒有發送任何廣播。
這是主要活動,從我開始服務
public class Main extends Activity {
private MyService service;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
if (service == null) {
Intent i = new Intent(this, MyService.class);
startService(i);
}
finish();
}
}
以下是服務代碼。
public class MyService extends Service{
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.d("MyService", "onStartCommand");
// do not receive all available system information (it is a filter!)
final IntentFilter battChangeFilter = new IntentFilter(
Intent.ACTION_BATTERY_CHANGED);
// register our receiver
this.registerReceiver(this.batteryChangeReceiver, battChangeFilter);
return super.onStartCommand(intent, flags, startId);
}
private final BroadcastReceiver batteryChangeReceiver = new BroadcastReceiver() {
@Override
public void onReceive(final Context context, final Intent intent) {
checkBatteryLevel(intent);
}
};
private void checkBatteryLevel(Intent batteryChangeIntent) {
// some calculations
final int currLevel = batteryChangeIntent.getIntExtra(
BatteryManager.EXTRA_LEVEL, -1);
final int maxLevel = batteryChangeIntent.getIntExtra(
BatteryManager.EXTRA_SCALE, -1);
final int percentage = (int) Math.round((currLevel * 100.0)/maxLevel);
if(percentage==100)
{
Intent intent = new Intent(getBaseContext(), Last.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
getApplication().startActivity(intent);
}
// do not forget to unregister
unregisterReceiver(batteryChangeReceiver);
} }
而當下面的活動開始時,我沒有收到任何廣播。
public class Last extends Activity {
Button btnCancel;
Uri notification;
Ringtone r;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_last);
notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE);
r = RingtoneManager.getRingtone(getApplicationContext(), notification);
r.play();
btnCancel = (Button) findViewById(R.id.stopsound);
btnCancel.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
r.stop();
}
});
} }
因爲你稱這條線爲unregisterReceiver(batteryChangeReceiver);在你開始你的活動之後。 –
但它在應用程序關閉時正常工作。 – user1999284
從我從服務類中讀取的信息,它會檢測電池電量是否爲100%,然後開始最後一次活動並停止(取消註冊)所有廣播接收器。因此,如果最後活動打開時,廣播將不再收到 –