即使应用程序被销毁，AsyncTask 也将始终运行? [英] AsyncTask will always run even if app is destroyed?
问题描述
我有一个应用程序，因为你不能在主线程上进行网络操作，所以我使用 AsyncTask，所以问题是一旦我 execute()AsyncTask 然后我 finish() 活动，也许用户会 finish() 整个应用程序，所以我想知道的是:
I have an application and because you can't do network operations on the main thread I'm using AsyncTask, so the question is once I execute() the AsyncTask and right after that I finish() the activity, and maybe the user will finish() the whole app, so what I'm wondering is:
- 将
AsyncTask总是完成doInBackground()和onPostExecute()即使应用程序关闭，只要execute()在应用运行时被调用?
- Will
AsyncTaskalways finishdoInBackground()andonPostExecute()even if the app is closed as long asexecute()was called when the app was running?
推荐答案
您将能够对此进行测试.是的，确实如此.如果调用了 execute ，您可以看到 Asynctask 仍将执行，除非它对前台或 UI 相关执行某些操作.(这可能会导致启动器崩溃).
You will be able to test this. And yes It does. If execute was called you can see Asynctask will still execute UNLESS it does something to the forground or UI related. (it may cause launcher to crash).
但是，如果它靠近系统.它可能会也可能不会继续执行该方法.我已经测试并回答了 这里.回复评论:已测试:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Worker().execute();
}
private class Worker extends AsyncTask<Void, Void, String> {
@Override
protected String doInBackground(Void... arg0) {
Log.i("SomeTag",
"start do in background at " + System.currentTimeMillis());
String data = null;
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(
"https://stackoverflow.com/questions/tagged/android");
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
data = EntityUtils.toString(httpEntity);
Log.i("SomeTag",
"doInBackGround done at " + System.currentTimeMillis());
} catch (Exception e) {
}
return data;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
Log.i("SomeTag", System.currentTimeMillis() / 1000L
+ " post execute
" + result);
}
}
@Override
protected void onDestroy() {
super.onDestroy();
Log.i("SomeTag", System.currentTimeMillis() / 1000L + " onDestory()");
}
04-24 21:42:57.981: I/SomeTag(5961): start do in background at 1366854177994
04-24 21:43:00.974: I/SomeTag(5961): 1366854180 onDestory()
04-24 21:43:02.946: I/SomeTag(5961): doInBackGround done at 1366854182946
04-24 21:43:02.946: I/SomeTag(5961): 1366854182 post execute
04-24 21:43:02.946: I/SomeTag(5961): <!DOCTYPE html>
04-24 21:43:02.946: I/SomeTag(5961): <html>
04-24 21:43:02.946: I/SomeTag(5961): <head>
04-24 21:43:02.946: I/SomeTag(5961):
04-24 21:43:02.946: I/SomeTag(5961): <title>Newest 'android' Questions - Stack Overflow</title>
04-24 21:43:02.946: I/SomeTag(5961): <link rel="shortcut icon" href="http://cdn.sstatic.net/stackoverflow/img/favicon.ico">
//....
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