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POAndroid Childactivity getParent question?
 

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  1. POAndroid Childactivity getParent question?
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    <p>Basically I'm using ActivityGroup in my application. I have this situation:</p> <p>I have Tabhost with activity A.</p> <p>Activity A creates childActivity B.</p> <pre><code>A ---&gt; B startChildActivity("CollectionList", new Intent(this,MyCollectionList.class)); </code></pre> <p>Activity B creates 3 childactivities C, D.</p> <pre><code>B ---&gt; C (childActivity of B) startChildActivity("Recommended", new Intent(MyCollectionList.this,Recommended.class)); B ---&gt; D (childActivity of B) startChildActivity("ExpectSoon", new Intent(MyCollectionList.this,ExpectSoon.class)); </code></pre> <p>B creates another childActivity too, name it E.</p> <pre><code>B ---&gt; E Intent previewMessage = new Intent(getParent(), MyCollectionId.class); TabGroupActivity parentActivity = (TabGroupActivity)getParent(); parentActivity.startChildActivity("MyCollectionId", previewMessage); </code></pre> <p>So basically Activity C and D can start activity E too, with : </p> <pre><code> Intent previewMessage = new Intent(getParent(), MyCollectionId.class); TabGroupActivity parentActivity = (TabGroupActivity)getParent(); parentActivity.startChildActivity("MyCollectionId", previewMessage); </code></pre> <p>I had Override the onBackPressed method so I can control the back button.It looks like this :</p> <pre><code> private ArrayList&lt;String&gt; mIdList; @Override public void onBackPressed () { int length = mIdList.size(); if ( length &gt;=1) { Activity current = getLocalActivityManager().getActivity(mIdList.get(length-1)); current.finish(); } } </code></pre> <p>So my problem is that when I'm in activity E and press the back button my application close.And the other problem that I have is with the alert dialog in activity E.</p> <pre><code>Button deactivate = (Button) findViewById(R.id.deactivate); deactivate.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { new AlertDialog.Builder( getParent() ) .setTitle( "Warning" ) .setMessage( "The collection will be removed completely from the device.You can reactivate it later again.This operation requires internet connection." ) .setPositiveButton( "Go ahead", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { Log.d("AlertDialog", "Positive"); } }) .setNegativeButton( "Cancel", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { Log.d("AlertDialog","Negative"); } }) .show(); } }); </code></pre> <p>When I start Activity E from A, when I click the button,which will show the alert dialog,everything is ok.But when I start activity E from C or D it throws me that exception :</p> <pre><code>08-15 15:48:22.819: ERROR/AndroidRuntime(32440): FATAL EXCEPTION: main 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): android.view.WindowManager$BadTokenException: Unable to add window -- token android.app.LocalActivityManager$LocalActivityRecord@4630ea20 is not valid; is your activity running? 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.view.ViewRoot.setView(ViewRoot.java:509) 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177) 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91) 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.view.Window$LocalWindowManager.addView(Window.java:424) 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.app.Dialog.show(Dialog.java:241) 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.app.AlertDialog$Builder.show(AlertDialog.java:802) 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at com.stampii.stampii.mystampii.MyCollectionId$4.onClick(MyCollectionId.java:75) 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.view.View.performClick(View.java:2408) 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.view.View$PerformClick.run(View.java:8817) 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.os.Handler.handleCallback(Handler.java:587) 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.os.Handler.dispatchMessage(Handler.java:92) 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.os.Looper.loop(Looper.java:144) 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.app.ActivityThread.main(ActivityThread.java:4937) 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at java.lang.reflect.Method.invokeNative(Native Method) 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at java.lang.reflect.Method.invoke(Method.java:521) 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p><strong>EDIT:</strong></p> <p>My startChildActivity looks like this :</p> <pre><code>public void startChildActivity(String Id, Intent intent) { Window window = getLocalActivityManager().startActivity(Id,intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)); if (window != null) { mIdList.add(Id); setContentView(window.getDecorView()); } </code></pre> <p>}</p> <p>latest LogCat,while using Recommended.parentActivity in ActivityE :</p> <pre><code> new AlertDialog.Builder( Recommended.parentActivity ) 08-15 16:33:53.509: ERROR/AndroidRuntime(1967): FATAL EXCEPTION: main 08-15 16:33:53.509: ERROR/AndroidRuntime(1967): java.lang.NullPointerException 08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at com.android.internal.app.AlertController$AlertParams.&lt;init&gt;(AlertController.java:743) 08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at android.app.AlertDialog$Builder.&lt;init&gt;(AlertDialog.java:273) 08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at com.stampii.stampii.mystampii.MyCollectionId$4.onClick(MyCollectionId.java:62) 08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at android.view.View.performClick(View.java:2408) 08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at android.view.View$PerformClick.run(View.java:8817) 08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at android.os.Handler.handleCallback(Handler.java:587) 08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at android.os.Handler.dispatchMessage(Handler.java:92) 08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at android.os.Looper.loop(Looper.java:144) 08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at android.app.ActivityThread.main(ActivityThread.java:4937) 08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at java.lang.reflect.Method.invokeNative(Native Method) 08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at java.lang.reflect.Method.invoke(Method.java:521) 08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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