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POProgressDialog not working in external AsyncTask
 

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  1. POProgressDialog not working in external AsyncTask
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    <p>I'm beginning to think that to get a ProgressDialog to work the AsyncTask has to be an inner class within an Activity class. True? [Edited much later...the answer is False and I'm not sure if this is a bug or what. I'm using Android 1.5. I'm going to read up on Services.]</p> <p>I have an activity the uses a database to manipulate information. If the database is populated all is well. If it is not populated then I need to download information from a website, populate the database, then access the populated database to complete the Views in onCreate.</p> <p>Problem is without some means to determine when the AsyncTask thread has finished populating the database, I get the following Force Close error message: Sorry! The application has stopped unexpectedly. I click on the Force Close button, the background AsyncTask thread continues to work, the database gets populated, and everything works ok.</p> <p>I need to get rid of that error message and need some help on how to do this. Here's some psuedo code:</p> <pre><code>public class ViewStuff extends Activity { onCreate { if(database is populated) do_stuff else { FillDB task = null; if(task == null || task.getStatus().equals(AsyncTask.Status.FINISHED)) { task = new FillDB(context); task.execute(null); } } continue with onCreate using information from database to properly display } // end onCreate } // end class </code></pre> <p>In a separate file:</p> <pre><code>public class FillDB extends AsyncTask&lt;Void, Void, Void&gt; { private Context context; public FillDB (Context c) //pass the context in the constructor { context = c; } public void filldb () { doInBackground(); } @Override protected void onPreExecute() { ProgressDialog progressDialog = new ProgressDialog(context); //crashes with the following line progressDialog.show(context, "Working..", "Retrieving info"); } @Override protected Void doInBackground(Void... params) { // TODO Auto-generated method stub try etc etc etc } } </code></pre> <p>Here's the stack trace from the emulator:</p> <pre><code>----- pid 846 at 2010-03-21 19:58:25 ----- Cmd line: com.trial DALVIK THREADS: "main" prio=5 tid=3 NATIVE | group="main" sCount=1 dsCount=0 s=0 obj=0x40018e70 | sysTid=846 nice=0 sched=0/0 handle=-1098855268 at android.os.BinderProxy.transact(Native Method) at android.app.ActivityManagerProxy.handleApplicationError(ActivityManagerNative.java:2103) at com.android.internal.os.RuntimeInit.crash(RuntimeInit.java:302) at com.android.internal.os.RuntimeInit$UncaughtHandler.uncaughtException(RuntimeInit.java:75) at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:887) at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:884) at dalvik.system.NativeStart.main(Native Method) "Binder Thread #3" prio=5 tid=15 NATIVE | group="main" sCount=1 dsCount=0 s=0 obj=0x43733d88 | sysTid=852 nice=0 sched=0/0 handle=1486928 at dalvik.system.NativeStart.run(Native Method) "Binder Thread #2" prio=5 tid=13 NATIVE | group="main" sCount=1 dsCount=0 s=0 obj=0x437313c8 | sysTid=851 nice=0 sched=0/0 handle=1492472 at dalvik.system.NativeStart.run(Native Method) "Binder Thread #1" prio=5 tid=11 NATIVE | group="main" sCount=1 dsCount=0 s=0 obj=0x4372b9b0 | sysTid=850 nice=0 sched=0/0 handle=1492664 at dalvik.system.NativeStart.run(Native Method) "JDWP" daemon prio=5 tid=9 VMWAIT | group="system" sCount=1 dsCount=0 s=0 obj=0x4372a2a0 | sysTid=849 nice=0 sched=0/0 handle=1490176 at dalvik.system.NativeStart.run(Native Method) "Signal Catcher" daemon prio=5 tid=7 RUNNABLE | group="system" sCount=0 dsCount=0 s=0 obj=0x4372a1e8 | sysTid=848 nice=0 sched=0/0 handle=1487888 at dalvik.system.NativeStart.run(Native Method) "HeapWorker" daemon prio=5 tid=5 VMWAIT | group="system" sCount=1 dsCount=0 s=0 obj=0x427d03c0 | sysTid=847 nice=0 sched=0/0 handle=1487592 at dalvik.system.NativeStart.run(Native Method) ----- end 846 ----- </code></pre> <p>What am I doing wrong?</p> <p>Mr. Snowflake,</p> <p>Tried:</p> <pre><code>@Override protected void onPreExecute() { Activity.this.runOnUiThread(new Runnable() { public void run() { ProgressDialog progressDialog = new ProgressDialog(context); //crashes with the following line progressDialog.show(context, "Working..", "Retrieving info"); } }); } </code></pre> <p>Activity.this is flagged as an error: No enclosing instance of the type Activity is accessible in scope</p> <p>I am thinking I need to FillDB extends Activity then create a private class within FillDB extending AsyncTask? That wont' work. No assurance when the FillDB activity will start and can't use startActivityForResult since no result is returned from AsyncTask when it is completed.</p> <p>Update: Tried creating a private class in the calling class. Still can't show a ProgressDialog. One of the errors is: Unable to add window -- token null is not for an application. I have no idea what token is being referred to.</p>
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    1. COUse `adb logcat`, DDMS, or the DDMS perspective in Eclipse to look at the Java stack trace associated with the force-close dialog, as that stack trace should give you more information about what is going wrong.
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    2. COCommonsWare - I don't know enough about adb to find the stack trace in /data/anr/traces.txt. But looking at the Logcat and DDMS in Eclipse it seems as if I have an uncaught Runtime exception. java.lang.reflect.InvocationTarget Exception java.lang.Runtime Exception WindowMai attempted to add window with non-application token WindowToken (43711b88 token=null) Aborting. I looked to see if the context was null and it doesn't appear to be: this.context shows: context android.app.Application (id=830060323048)
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    3. COWhat happens with the dialog, if you change between landscape/portrait mode while the task is running? Is it save to create the dialog in a Runnable using runOnUiThread(...)?
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