将startForeground()与意图服务一起使用

本文介绍了将startForeground()与意图服务一起使用的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 我正在尝试保持一项对屏幕开/关更改做出反应的服务.该服务将在一段时间内运行良好，但最终将被终止.我现在正尝试使用startForeground()来保持该进程运行，但是它似乎仍在消亡.我知道没有办法可以使进程永远存活，没有错误，但是我觉得我一定做错了，因为添加startForeground()不会增加进程的寿命.另外，作为附带说明，由于未调用unregisterReceiver()(除非通过用户手动按下按钮进行手动操作)，Logcat抱怨存在泄漏..但是，由于我要完成的工作性质，接收方需要运行，直到明确告知要停止为止. I am trying to keep alive a service that reacts to screen on/off changes. The service would work perfectly for awhile, but then eventually it would be killed. I am now attempting to use startForeground() to keep the process alive, but it still seems to be dying. I understand that there is no way to keep a process alive forever, without error, but I feel like I must be doing something wrong, as adding startForeground() added no extra life to the process. Also, as a side note, Logcat complains about a leak, as unregisterReceiver() is not called (except manually by a button press from the user).. however, due to the nature of what I am trying to accomplish, the receiver needs to run until explicitly told to stop. 有什么建议吗?相关代码:public class UpdateService extends IntentService { public UpdateService() { super(null); } @Override protected void onHandleIntent(Intent intent) { final int myID = 1234; Intent notificationintent = new Intent(this, Main.class); notificationintent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP); PendingIntent pendIntent = PendingIntent.getActivity(this, 0, notificationintent, 0); Notification notice = new Notification(R.drawable.icon_image, "***********", System.currentTimeMillis()); notice.setLatestEventInfo(this, "*************", "***********", pendIntent); notice.flags |= Notification.FLAG_NO_CLEAR; startForeground(myID, notice); boolean screenOn = intent.getBooleanExtra("screen_state", false);// Blah Blah Blah...... } @Override public IBinder onBind(Intent arg0) { // TODO Auto-generated method stub return null; }}推荐答案(已更新)我想可能存在以下情况:(Updated) I suppose there are the following possible cases: 1) IntentService的文档状态: 该服务根据需要启动，依次使用 工作线程，并在工作耗尽时自行停止. the service is started as needed, handles each Intent in turn using a worker thread, and stops itself when it runs out of work.因此，可能是您的服务通常在onHandleIntent()完成后停止了(特别是，正如您提到的，startForeground()并没有增加进程的寿命).So, it might be that your service is normally stopped after onHandleIntent() is finished (especially, as you mentioned that startForeground() added no extra life to the process). 2)，您可能会尝试检查它是否与睡眠的设备有关(或者您可能正在按计划启动设备并唤醒设备-在这种情况下，您可能需要获取 WakeLock )2) You might try to check if it's somehow can be related to device going to sleep (or maybe you are starting your service by schedule and awkening device - in this case you might need to acquire WakeLock) 3)在极少数情况下，系统仍然可以终止前台进程-因此，如果您在onHandleIntent()中进行了大量分配(确实很多)和其他工作(而不是"Blah Blah Blah")-您可能会遇到它-但我认为情况并非如此.3) In the very rare cases, the system still can kill foreground process - so if you do a lot of allocations (really lot) and some other work in onHandleIntent() (instead of "Blah Blah Blah" at your code) - you might run into it - but I suppose it's not the case.问题的标题是将startForeground()与IntentService一起使用"-也想澄清一下:我相信没有什么(架构，最佳做法，android框架，IntentService的Java文档)可以阻止您将Intent服务作为前台运行.当然，您需要仔细考虑其用法以及您是否确实需要前台服务.可以在此处获得一些建议.有关示例代码，请参见下文. (如果您将多个作业/意图排队到IntentService中，则示例代码最终可能会显示多个通知，因此根据您的需要，可能会有更好的解决方案.)As question's title is "Using startForeground() with an IntentService" - would like to clarify that too:I believe nothing (architecture, best practices, android framework, java docs for IntentService) prevents you from running your intent service as a foreground. Of course you need to thought out carefully its usage and whether you actually need a foreground service. Some ideas are available here. For sample code see below. (Sample code can end up showing multiple notifications if you queued multiple jobs/intents into IntentService, so there might be better solution depending on your need.)public class ForegroundService extends IntentService { private static final String TAG = "FrgrndSrv"; public ForegroundService() { super(TAG); } @Override protected void onHandleIntent(Intent intent) { Notification.Builder builder = new Notification.Builder(getBaseContext()) .setSmallIcon(R.drawable.ic_foreground_service) .setTicker("Your Ticker") // use something from something from R.string .setContentTitle("Your content title") // use something from something from .setContentText("Your content text") // use something from something from .setProgress(0, 0, true); // display indeterminate progress startForeground(1, builder.build()); try { doIntesiveWork(); } finally { stopForeground(true); } } protected void doIntesiveWork() { // Below should be your logic that takes lots of time try { Thread.sleep(10000); } catch (InterruptedException e) { e.printStackTrace(); } }} 这篇关于将startForeground()与意图服务一起使用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！