java.lang.IllegalStateException：尝试运行RingtoneService时不允许启动服务意图 [英] java.lang.IllegalStateException: Not allowed to start service Intent while trying to run RingtoneService

问题描述

我正在创建一个包含许多功能的管理器应用，其中一个是警报，而在大多数情况下，尝试启动警报的RingtoneService时都会收到此异常 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）！
我广泛地寻找答案，然后尝试了以下方法，但均无济于事：
-JobScheduler：我遇到了相同的异常
-bindService（）并将代码写入onServiceConnected（）内：从未成功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()

下面是我代码的重要部分：

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);
    }
}

以下活动的广播通话：

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);

以下服务类别：

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

如果如果您在Android 8.0上运行代码，则可能会出现这种情况。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，则在后台提供服务。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 );

确保在您的计算机中调用 startForeground（）带有通知的onHandleIntent。您可以参考此 SO 以获得实施它的详细信息。

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

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