Question

我当前正在尝试在前台服务上执行一些代码。我的手机在android 6和android 7上一切正常。但是，当我在android 5设备上尝试使用该服务时，该活动被破坏了。

在调用bindService之前，我正在手动启动服务。我在onStart上调用bindService，在onStop方法上调用unbindService。

这是我的服务

public class ExecutionService extends Service {
    private final IBinder binder = new ExecutionBinder();
    private static final int NOTIFICATION_ID = 1;
    private static final String STOP_ACTION = "STOP_ACTION";

    private Notification.Builder builder;
    private boolean timerHeaderVisible;
    private NotificationManager nm;
    private Intent notificationIntent;
    private PendingIntent contentIntent;

    public class ExecutionBinder extends Binder {
        public ExecutionService getService() {
          return ExecutionService.this;
        }
    }

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

    @Override
    public void onCreate() {
        super.onCreate();
        nm = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
        builder = new Notification.Builder(this);

        Intent stopSelf = new Intent(this, ExecutionService.class);
        stopSelf.setAction(STOP_ACTION);
        PendingIntent closePendingIntent = PendingIntent.getService(this, 0, stopSelf,PendingIntent.FLAG_CANCEL_CURRENT);

        builder.setSmallIcon(R.drawable.ic_time)
                .setContentTitle(getString(R.string.app_name))
                .addAction(R.drawable.ic_stop, getString(R.string.stop), closePendingIntent)
                .setVibrate(new long[]{0L});

        Notification notification = builder.build();
        notification.flags |= Notification.FLAG_NO_CLEAR;
        startForeground(NOTIFICATION_ID, notification);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        NotificationManager notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
        if(notificationManager != null)
            notificationManager.cancelAll();
        isStarted = false;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        if(intent != null && intent.getAction() != null && intent.getAction().equals(STOP_ACTION)) {
            stopForeground(true);
            stopSelf();
        }

        return START_STICKY;
    }

}

我注意到从不调用onDestroy方法，但是两次调用onCreate方法。

如何使其在Android 5设备上正常工作？感谢您的帮助。

Answer 1

尝试删除此方法

 @Override
    public void onDestroy() {
        super.onDestroy();
        NotificationManager notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
        if(notificationManager != null)
            notificationManager.cancelAll();
        isStarted = false;
    }

Answer 2

最后，我发现了问题所在。我正在活动的onDestroy中的空对象上调用方法。然后服务崩溃了（仅适用于android吗？）。我没有注意到控制台中的错误，因为该应用程序正在重新启动。

活动结束后，Android startForeground重新启动

2 个答案: