android - Android 后台服务在几分钟后断开连接

Question

我正在尝试构建一个background service通知来运行和显示通知，即使应用程序不在内存中

但问题是，在我使用的广播服务一段时间后，大约 8 分钟后断开连接，我无法收到通知，就像服务已经死了一样。

我将Pusher用于通知部分。我正在订阅和收听广播服务中的事件。

我可以在Pusher调试控制台中看到，设备在一段时间后断开连接。

构建即使应用程序关闭或不在内存中也能继续运行的后台服务的最佳方法是什么。

当然它应该是跨版本的android。

我怎样才能做到这一点？

谢谢！

Answer 1

试试下面的代码

public class BackgroundUpdateService extends Service {

    /**
     * Author：Hardik Talaviya
     * Date：  2019.08.3 2:30 PM
     * Describe:
     */

    private static final String TAG = "BackgroundLocation";
    private Context context;
    private boolean stopService = false;
    private Handler handler;
    private Runnable runnable;
    private NotificationCompat.Builder builder = null;
    private NotificationManager notificationManager;

    @Override
    public void onCreate() {
        Log.e(TAG, "Background Service onCreate :: ");
        super.onCreate();
        context = this;

        handler = new Handler();
        runnable = new Runnable() {

            @Override
            public void run() {
                try {
                    //Add Here your code if you want start in background
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {
                    handler.postDelayed(this, TimeUnit.SECONDS.toMillis(2));
                }
            }
        };
        if (!stopService) {
            handler.postDelayed(runnable, TimeUnit.SECONDS.toMillis(2));
        }
    }

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

    @Override
    public void onTaskRemoved(Intent rootIntent) {
        super.onTaskRemoved(rootIntent);
        Log.e(TAG, "onTaskRemoved :: ");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.e(TAG, "onStartCommand :: ");
        StartForeground();
        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.e(TAG, "BackgroundService onDestroy :: ");
        stopService = true;
        if (handler != null) {
            handler.removeCallbacks(runnable);
        }
    }

    /*-------- For notification ----------*/
    private void StartForeground() {
        Intent intent = new Intent(context, MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent, PendingIntent.FLAG_ONE_SHOT);

        String CHANNEL_ID = "channel_location";
        String CHANNEL_NAME = "channel_location";

        notificationManager = (NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT);
            channel.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
            notificationManager.createNotificationChannel(channel);
            builder = new NotificationCompat.Builder(getApplicationContext(), CHANNEL_ID);
            builder.setColorized(false);
            builder.setChannelId(CHANNEL_ID);
            builder.setColor(ContextCompat.getColor(this, R.color.colorPrimaryDark));
            builder.setBadgeIconType(NotificationCompat.BADGE_ICON_NONE);
        } else {
            builder = new NotificationCompat.Builder(getApplicationContext(), CHANNEL_ID);
        }
        builder.setOnlyAlertOnce(true);
        builder.setContentTitle(context.getResources().getString(R.string.app_name));
        builder.setContentText("Your Text");
        Uri notificationSound = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_NOTIFICATION);
        builder.setSound(notificationSound);
        builder.setAutoCancel(true);
        builder.setSmallIcon(R.mipmap.ic_notification_app_icon);
        builder.setContentIntent(pendingIntent);
        startForeground(101, builder.build());
    }
}

我希望这可以帮助你！

谢谢你。

Answer 2

也许是后台执行限制问题。解决方案：您应该在服务中使用 startForeground。