Question

我正在尝试创建在后台运行，检查信息并在需要时发出通知的服务。我在互联网上尝试了几个基本相同的示例，但是我没有让它们起作用。

我有一个服务和一个BroadcastReceiver。当我启动该应用程序时，将创建该服务，并在每个滴答处记录一个时间。所以，这很好。在onDestroy上，我设置了一个新的意图，该意图与“ sendBroadcast（...）”一起发送。 BroadcastReceiver类在onReceive上有一个重写，它应该记录一个简单的文本。但是我没看过文字。

服务

public class ServiceNoDelay extends Service {
    public int counter = 0;
    Context context;

    public ServiceNoDelay(Context applicationContext) {
        super();
        context = applicationContext;
        Log.i("HERE", "here service created!");
    }

    public ServiceNoDelay() {
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        super.onStartCommand(intent, flags, startId);
        startTimer();
        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();

        Log.i("EXIT", "ondestroy!");

        Intent broadcastIntent = new Intent();
        broadcastIntent.setAction("com.custom.package.RestartSensor");
        sendBroadcast(broadcastIntent);
        stoptimertask();


        Log.i("EXIT", "Broadcast send!");
    }

    private Timer timer;
    private TimerTask timerTask;

    public void startTimer() {
        //set a new Timer
        timer = new Timer();

        //initialize the TimerTask's job
        initializeTimerTask();

        //schedule the timer, to wake up every 1 second
        timer.schedule(timerTask, 1000, 1000); //
    }

    public void initializeTimerTask() {
        timerTask = new TimerTask() {
            public void run() {
                Log.i("in timer", "in timer ++++  " + (counter++));
            }
        };
    }

    public void stoptimertask() {
        //stop the timer, if it's not already null
        if (timer != null) {
            timer.cancel();
            timer = null;
        }
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}

广播接收器

public class SensorRestarterBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.i(SensorRestarterBroadcastReceiver.class.getSimpleName(), "Service Stops! Oops!!!!");
        context.startService(new Intent(context, ServiceNoDelay.class));

    }
}

清单部分

<service
            android:name=".ServiceNoDelay"
            android:enabled="true" />
        <receiver
            android:name=".SensorRestarterBroadcastReceiver"
            android:enabled="true"
            android:exported="true"
            android:label="RestartServiceWhenStopped">
            <intent-filter>
                <action android:name="com.custom.package.RestartSensor" />
            </intent-filter>
        </receiver>

我在MainActivity中调用的代码部分

ServiceNoDelay mSensorService = new ServiceNoDelay(getApplicationContext());
        Intent mServiceIntent = new Intent(getApplicationContext(), mSensorService.getClass());
        startService(mServiceIntent);

我希望logcat将显示“服务停止！糟糕！！！”当应用关闭时，我可以再次激活该服务。

如果我在关闭应用程序后发现显示通知的错误路径；我愿意提出建议。

Answer 1

您需要做的几件事， 1.如果需要让服务在后台运行，请创建一个前台服务。 2.关闭打ze模式 3.或点击this链接以在后台运行服务

或者在代码中，您可以致电onTaskRemoved并添加一条警报以重新启动服务

 @Override
public void onTaskRemoved(Intent rootIntent) {
    Log.e("FLAGX : ", ServiceInfo.FLAG_STOP_WITH_TASK + "");

    Intent restartServiceIntent = new Intent(getApplicationContext(),
            this.getClass());
    restartServiceIntent.setPackage(getPackageName());

    Intent intent = new Intent(getApplicationContext(), this.getClass());

    intent.setPackage(getPackageName());

    PendingIntent restartServicePendingIntent = PendingIntent.getService(
            getApplicationContext(), 1, restartServiceIntent,
            PendingIntent.FLAG_ONE_SHOT);
    AlarmManager alarmService = (AlarmManager) getApplicationContext()
            .getSystemService(Context.ALARM_SERVICE);
    alarmService.set(AlarmManager.ELAPSED_REALTIME,
            SystemClock.elapsedRealtime() + 2000,
            restartServicePendingIntent);

    super.onTaskRemoved(rootIntent);
}

在清单中添加权限

<uses-permission android:name="android.permission.SET_ALARM"/>

停止应用程序时发送广播从未执行

1 个答案: