java.lang.IllegalStateException:在尝试运行 RingtoneService 时不允许启动服务 Intent

问题描述

我正在创建一个管理器应用程序，其中包含许多功能，其中一个是闹钟，但在大多数情况下尝试为我的闹钟启动 RingtoneService 时，我收到此异常java.lang.IllegalStateException:不允许启动服务意图" 因为它在后台运行(有时会延迟运行)！我广泛搜索了答案并尝试了以下方法，但都没有奏效:- JobScheduler:我得到同样的例外- bindService() 并在 onServiceConnected() 中编写代码:它永远不会命中 onServiceConnected()

I am creating an organizer app which contains many functions one of them is an alarm, while trying to start the RingtoneService for my alarm most of the times I get this exception "java.lang.IllegalStateException: Not allowed to start service Intent" because it's running in the background (sometimes it runs with delay)!I extensively searched for an answer and tried the following and none worked:- JobScheduler : I get the same exception- bindService() and writing the code inside onServiceConnected() : it never hits the onServiceConnected()

以下是我的代码的重要部分:

Below are the important parts of my code:

public class AlarmReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(final Context context, Intent intent) {

        Intent serviceIntent = new Intent(context, RingtonePlayingService.class);
        context.startService(serviceIntent);
    }
}

来自以下活动的广播电话:

Broadcast call from activity below:

Intent intent = new Intent(AddAlarm.this, AlarmReceiver.class)
                .putExtra("ALARM_ON", true);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this.getApplicationContext(), 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

        alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);

以下服务类:

public class RingtonePlayingService extends Service {

    // Player
    MediaPlayer player;
    boolean isRunning;

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

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        if (!isRunning) {

            player = MediaPlayer.create(this, R.raw.ringtone);
            player.start();

            this.isRunning = true;

            showNotification();

        }
        else if (isRunning) {

            player.stop();

            this.isRunning = false;

        }

        return START_STICKY;
    }
}

推荐答案

如果您在 Android 8.0 上运行您的代码，那么这种行为是正常的.根据文档，从Android 8.0开始，您无法启动如果您的应用程序不在前台，则为后台服务.您需要替换以下内容:

If you are running your code on Android 8.0 then this behavior is expected. Based on the documentation, starting from Android 8.0, you cannot start a service in background if your application is not in foreground. You need to replace following:

Intent serviceIntent = new Intent(context, RingtonePlayingService.class);
context.startService(serviceIntent);

做

Intent serviceIntent = new Intent(context, RingtonePlayingService.class);
ContextCompat.startForegroundService(context, serviceIntent );

确保通过通知在您的 onHandleIntent 中调用 startForeground().你可以参考这个SO了解实现它的细节.

Ensure to call startForeground() in your onHandleIntent with notification. You can refer to this SO for details to implement it.

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