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POWhen would Activity's instance die?
 

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  1. POWhen would Activity's instance die?
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    <p>Here is a sample code which make me a little missing:</p> <pre><code>package com.leak; import android.app.Activity; import android.app.ProgressDialog; import android.os.AsyncTask; import android.os.Bundle; public class WindowLeakActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); new LeakThread().execute(); } class LeakThread extends AsyncTask&lt;Void, Void,Void&gt;{ ProgressDialog dialog; @Override protected void onPreExecute() { dialog=new ProgressDialog(WindowLeakActivity.this); dialog.show(); } @Override protected Void doInBackground(Void... params) { try { Thread.sleep(2000); finish(); Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } return null; } @Override protected void onPostExecute(Void result) { //that would be ok if(WindowLeakActivity.this!=null &amp;&amp; !WindowLeakActivity.this.isFinishing()) dialog.dismiss(); } }} </code></pre> <p>As you see,I create a LeakThread and finish the WindowLeakActivity at doInBackground()method.</p> <p>In order to prevent window leak error,I have to check if the Activity has been finished at onPostExecute()method.That make me a little missing.I have following questions:</p> <blockquote> <ol> <li>Is do Activity instance isFinish() check at onPostExecute safe?If my Thread class is not a inner class of Activity.Do I have to check Activity instance is not null at first?</li> <li>When would Activity instance die?As Activity's lifecycle description,it will terminal when callback call onDestroy().But however,the Activity's Thread is still going.Though it's window been not visible,I can also get it's instance.</li> <li>If I call the System.gc().Will it collect Activity's instance?</li> </ol> </blockquote> <p>Sorry for my bad description.Thank you for reading my question very much.</p>
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    1. COI know it is not answer but please check this: http://commonsware.com/blog/2010/09/10/asynctask-screen-rotation.html you can find here very nice example how AsyncTask can be handled with all those activity problems.
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    2. COThank you.This is a good and safe AsyncTask template。
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