Android9.0：不允许启动服务：应用在后台..onResume（）之后

Question

@Override
protected void onResume() {
    super.onResume();

    startService(new Intent(this, MusicService.class));
}

Caused by java.lang.IllegalStateException: Not allowed to start service Intent { cmp=another.music.player/com.simplecity.amp_library.playback.MusicService }: app is in background uid UidRecord{6a4a9c6 u0a143 TPSL bg:+3m25s199ms idle change:cached procs:1 seq(1283,1283,1283)}
       at android.app.ContextImpl.startServiceCommon(ContextImpl.java:1577)
       at android.app.ContextImpl.startService(ContextImpl.java:1532)
       at android.content.ContextWrapper.startService(ContextWrapper.java:664)
       at android.content.ContextWrapper.startService(ContextWrapper.java:664)
       at com.simplecity.amp_library.utils.MusicServiceConnectionUtils.bindToService(SourceFile:36)
       at com.simplecity.amp_library.ui.activities.BaseActivity.bindService(SourceFile:129)
       at com.simplecity.amp_library.ui.activities.BaseActivity.onResume(SourceFile:96)

在调用onresume()（和super.onresume())之后，我的应用程序怎么可能就在后台呢？

这对我来说没有任何意义。这可能是平台错误吗？受这次崩溃影响的所有3500+用户都在Android P上。

Answer 1

谷歌有一个变通办法：

这个问题已经在未来的Android版本中解决了。

有一种解决方法可以避免应用程序崩溃。应用程序可以通过调用ActivityManager.GetRunningAppProcesses()获得Activity.OnResume（）中的进程状态，如果重要性级别低于ActivityManager.RunningAppProcessInfo.Importance_Foreground则避免启动服务。如果设备尚未完全唤醒，活动将立即暂停，并最终在完全唤醒后再次恢复。

// hack for https://issuetracker.google.com/issues/113122354
    List<ActivityManager.RunningAppProcessInfo> runningAppProcesses = activityManager.getRunningAppProcesses();
    if (runningAppProcesses != null) {
        int importance = runningAppProcesses.get(0).importance;
        // higher importance has lower number (?)
        if (importance <= ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND)
            URLPlayerService.startActionBroadcastServiceData(PlayerActivity.this);
    }

// hack for https://issuetracker.google.com/issues/113122354
   handler.postDelayed(() -> URLPlayerService.startService(PlayerActivity.this),200);