在Android版的onReceive死于报警 [英] android alarm died during onReceive

问题描述

我有一个计时器应用程序，它唤醒了系统报警设备（RTC_WAKEUP），并打开我的应用程序。经过数千次成功报警，只是happend，该设定的报警并不完全成功。它的onR​​eceive过程中死亡（），并没有启动我的应用程序，也不解雇的系统通知。这里是广播接收器的的onReceive（）方法：

i have a timer app, which wakes up the device with system alarms (RTC_WAKEUP) and opens my app. after thousands of successful alarms, it just happend, that the set alarm was not completely successful. it died during onReceive() and did not start my app, nor it fired a system notification. here is the BroadcastReceiver's onReceive() method:

public void onReceive(Context context, Intent intent) {
    Log.i("timer", "timer's end broadcast received at: " + (System.currentTimeMillis() / 1000) );
    m_Context = context;

    Bundle extras = intent.getExtras();
    final int id = extras.getInt("timer_id");

    Intent activityIntent = new Intent(m_Context, TinyTimerActivity.class);
    activityIntent.putExtra("timer_id", id);
    activityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);
    m_Context.startActivity(activityIntent);

    m_SharedPrefs = PreferenceManager.getDefaultSharedPreferences(m_Context);

    // start the alarm sound
    final AudioManager localAudioManager = (AudioManager)m_Context.getSystemService("audio");
    final int ringerMode = localAudioManager.getRingerMode();
    final boolean audibleInSilentMode = m_SharedPrefs.getBoolean("audible_in_silent_mode", true);
    final boolean silentAlarm = m_SharedPrefs.getBoolean("silent_alarm", false);

    // and now load the alarm sound and play it for the desired time
    showFinishedNotification(!silentAlarm && (ringerMode != AudioManager.RINGER_MODE_SILENT || audibleInSilentMode));

    // cancel the alarm after some time
    final int duration = Integer.parseInt(m_SharedPrefs.getString("alarm_length", "-1"));
    if (duration > 0 ) {
        (new Handler()).postDelayed(new Runnable() {
            @Override
            public void run() {
                ((NotificationManager)m_Context.getSystemService(Context.NOTIFICATION_SERVICE)).cancel(NOTIFICATION_TIMER_FINISED_ID);
            }
        }, duration * 1000);
    }
}

报警被触发时，我用gReader应用程序。这里是logcat的（我的应用程序是sk.martinflorek.TinyTimer）：

when the alarm was triggered, i was using gReader app. here is the logcat (my app is sk.martinflorek.TinyTimer):

I(  146) Start proc sk.martinflorek.TinyTimer for broadcast sk.martinflorek.TinyTimer/.timers.TimerReceiver: pid=18307 uid=10070 gids={3003}  (ActivityManager)
I(18307) Pub sk.martinflorek.TinyTimer.providers.TimersProvider: sk.martinflorek.TinyTimer.providers.TimersProvider  (ActivityThread)
I(18307) timer's end broadcast received at: 1333208420  (timer)
I(  146) Starting: Intent { flg=0x30000000 cmp=sk.martinflorek.TinyTimer/.TinyTimerActivity (has extras) } from pid 18307  (ActivityManager)
D(18198) couldn't save which view has focus because the focused view com.noinnion.android.greader.reader.ui.view.ItemWebView@406dd4f0 has no id.  (PhoneWindow)
I(  146) No longer want android.process.media (pid 17918): hidden #16  (ActivityManager)
I(  146) Sending signal. PID: 18307 SIG: 9  (Process)
I(  146) Kill sk.martinflorek.TinyTimer (pid 18307): provider com.android.providers.media.MediaProvider in dying process android.process.media  (ActivityManager)
I(  146) Process sk.martinflorek.TinyTimer (pid 18307) has died.  (ActivityManager)

为什么的 android.process.media 的杀了我的应用程序，以及如何prevent呢？它的发生只有一次......

why did the android.process.media killed my app and how to prevent this? it happend only once...

推荐答案

A 广播接收器并不意味着长期运行的操作。 广播接收器 s的假设是非常短暂的。我从别人读到广播接收器取值应持续50 ms的最大值，如果它的时间越长，你应该开始一个服务。

A BroadcastReceiver is not meant for long running operations. BroadcastReceivers are suppose to be very short lived. I've read from others that BroadcastReceivers should last for a max of 50 ms, and if it's any longer, you should start a Service.

所以，你应该要么只是将闹钟设置为从内部开始服务，或启动服务的广播接收器和移动任何费时code（如 Handler.postDelayed（））的服务。

So you should either just set the alarm to start a Service, or start a Service from within the BroadcastReceiver and move any time consuming code (such as Handler.postDelayed()) to the Service.

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