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POAndroid 2.2: ProgressDialog Freezing In Second Thread
 

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  1. POAndroid 2.2: ProgressDialog Freezing In Second Thread
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    <p>I have recently experimented with creating an easy way to open a ProgressDialog up in a second thread, so if the main thread freezes the dialog will keep working.</p> <p>Here is the class: public class ProgressDialogThread extends Thread { public Looper ThreadLooper; public Handler mHandler;</p> <p>public ProgressDialog ThreadDialog; public Context DialogContext; public String DialogTitle; public String DialogMessage;</p> <pre><code>public ProgressDialogThread(Context mContext, String mTitle, String mMessage) { DialogContext = mContext; DialogTitle = mTitle; DialogMessage = mMessage; } public void run() { Looper.prepare(); ThreadLooper = Looper.myLooper(); ThreadDialog = new ProgressDialog(DialogContext); ThreadDialog.setTitle(DialogTitle); ThreadDialog.setMessage(DialogMessage); ThreadDialog.show(); mHandler = new Handler(); Looper.loop(); } public void Update(final String mTitle, final String mMessage) { while(mHandler == null) synchronized(this) { try { wait(10); } catch (InterruptedException e) { Log.d("Exception(ProgressDialogThread.Update)", e.getMessage() == null ? "MISSING MESSAGE" : e.getMessage()); } } mHandler.post(new Runnable(){ @Override public void run() { ThreadDialog.setTitle(mTitle); ThreadDialog.setMessage(mMessage); }}); } public void Dismiss() { while(ThreadDialog == null || mHandler == null) synchronized(this) { try { wait(10); } catch (InterruptedException e) { Log.d("Exception(ProgressDialogThread.Dismiss)", e.getMessage() == null ? "MISSING MESSAGE" : e.getMessage()); } } mHandler.post(new Runnable(){ @Override public void run() { ThreadDialog.dismiss(); }}); } public void Continue() { while(ThreadLooper == null || mHandler == null) synchronized(this) { try { wait(10); } catch (InterruptedException e) { Log.d("Exception(ProgressDialogThread.Continue)", e.getMessage() == null ? "MISSING MESSAGE" : e.getMessage()); } } mHandler.post(new Runnable(){ @Override public void run() { ThreadLooper.quit(); }}); } </code></pre> <p>However it sometimes work perfectly but other times the application simply freezes and crashes eventually.</p> <p>Here is an example of use:</p> <pre><code>ProgressDialogThread thread = new ProgressDialogThread(this, "Loading", "Please wait..."); thread.start(); // Do Stuff thread.Dismiss(); thread.Continue(); </code></pre> <p>It generates a lot of warning and even some crashes sometimes:</p> <p>eg. Handler: Sending message to dead thread....</p> <p>and exceptions like ANR in ...... Reason: keyDispatchingTimedOut</p> <p>Thanks for any help, Alex.</p>
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    1. USAlex Hope O'Connor
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      1. USKelly Merrell
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