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你好朋友我正在开发一个 Battery android 应用程序。关闭应用程序后在状态栏上显示电池电量（％）。我启动了一个作为后台进程运行的服务类并放置了一些代码。通知服务.java

 public void onCreate(){
        super.onCreate();
        IntentFilter filter= new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        Intent batteryStatus= getApplicationContext().registerReceiver(null, filter);
        int status= batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
        batteryLevel= String.valueOf(status);

    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
    //make the toast message
    Toast.makeText(this, "Service Started"+batteryLevel+"%", Toast.LENGTH_LONG).show();

    //show the notification on status bar
    NotificationManager nm=(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    Intent intent2= new Intent(this, MainActivity.class);
    PendingIntent pendingIntent= PendingIntent.getActivity(getApplicationContext(), 0, intent2, PendingIntent.FLAG_UPDATE_CURRENT);
    NotificationCompat.Builder mbuilder= new 
            NotificationCompat.Builder(this)
    .setSmallIcon(R.drawable.ic_launcher)
    .setContentTitle("Battery Level: "+batteryLevel+"%")
    .setContentText("Battery Level: "+batteryLevel+"%")
    .setContentIntent(pendingIntent);

    nm.notify(notificationID, mbuilder.build());
    return START_STICKY;
    }

    @Override
    public void onDestroy(){
        super.onDestroy();
        Toast.makeText(getApplicationContext(), "service Destroy", Toast.LENGTH_SHORT).show();
    }

    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        return null;
    }

}

在 MainActivity.java

rotected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    b1= (Button) findViewById(R.id.button1);
    b2= (Button) findViewById(R.id.button2);
    tv= (TextView) findViewById(R.id.textView1);
    createListener();
}


private void createListener() {
    b1.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            startService(new Intent(getBaseContext(), Notificationservice.class));
        }
    });

    b2.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            stopService(new Intent(getBaseContext(), Notificationservice.class));

        }
    });

}

当我按下运行应用程序时，应用程序正常运行，但当我按下启动服务按钮时，状态栏上会显示电池电量，但它不会更改/更新，它保持不变。请朋友帮忙，我该怎么办......？？？

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1 回答 1

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您需要从广播接收器启动服务或通知..只需注册广播以获取电池电量..并从接收器的 onreceive() 方法..调用通知或启动服务..

于 2014-10-26T14:11:39.577 回答