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POCursorAdapter and OnItemClickListener for ListView Related Questions
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copied!<p>I would like to two questions related to the behavior of <code>OnItemClickListener</code>, when using a cursor adapter for my listivew. More specifically:</p> <p>I have overridden the <code>getCount()</code> of cursor adapter in order to add a log (in order to check when it is called). I have noticed that when I click on an item of the list, I see that the getCount() has been executed twice. I don't really understand why this is happening.. Below is the overridden <code>getCount()</code>. <code>mCursor</code> is a cursor object of my adapter.</p> <pre><code> @Override public int getCount() { if (mCursor != null) { int total = mCursor.getCount(); Log.d(TAG, "Count of cursor is: " + total); return total; } else Log.e(TAG, "Count of cursor is: " + 0); return 0; } </code></pre> <p>Secondly, from this listener I want to start another activity. When I click an item, I get the following exception:</p> <blockquote> <p>08-26 14:15:20.487: DEBUG/AgendaAdapter(14110): Count of cursor is: 14</p> <p>08-26 14:15:20.525: DEBUG/AgendaAdapter(14110): Count of cursor is: 14</p> <p>08-26 14:15:20.535: DEBUG/AgendaActivity(14110): Position is: 2</p> <p>08-26 14:15:20.535: DEBUG/AgendaActivity(14110): Id is: 353</p> <p>08-26 14:15:20.535: INFO/ActivityManager(104): Starting activity: Intent {AgendaEventActivity (has extras) }</p> <p>08-26 14:15:20.575: DEBUG/AgendaActivity(14110): onPause</p> <p>08-26 14:15:20.865: INFO/ActivityManager(104): Displayed activity AgendaEventActivity: 287 ms (total 287 ms)</p> <p>08-26 14:15:20.875: DEBUG/AgendaAdapter(14110): Count of cursor is: 14</p> <p>08-26 14:15:20.875: DEBUG/AgendaAdapter(14110): Count of cursor is: 14</p> <p>08-26 14:15:20.885: DEBUG/AgendaAdapter(14110): Count of cursor is: 14</p> <p>08-26 14:15:20.885: DEBUG/AgendaAdapter(14110): Count of cursor is: 14</p> <p>08-26 14:15:20.885: DEBUG/AndroidRuntime(14110): Shutting down VM</p> <p>08-26 14:15:20.885: WARN/dalvikvm(14110): threadid=1: thread exiting with uncaught exception (group=0x40028a00) 08-26 14:15:20.905: ERROR/AndroidRuntime(14110): FATAL EXCEPTION: main 08-26 14:15:20.905: ERROR/AndroidRuntime(14110): java.lang.IllegalStateException: this should only be called when the cursor is valid</p> </blockquote> <p>So, the <code>getCount()</code> is executed when I click an item, then follows two logs from <code>onItemClickListener</code> with the <code>pos</code> and the <code>id</code> of the clicked item, and then <code>getCount()</code> is called again... Finally the current activity get paused and the new one that I start get this <code>IllegalStateException</code>, which I cant understand why..</p> <p>For the cursor, I used managedquery() when I start it..</p> <p>Any help would be really grateful! Thank you for your time!</p> <p>The stack trace of the exception is:</p> <blockquote> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): FATAL EXCEPTION: main</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): java.lang.IllegalStateException: this should only be called when the cursor is valid 08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.widget.CursorAdapter.getView(CursorAdapter.java:175)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.widget.AbsListView.obtainView(AbsListView.java:1294)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.widget.ListView.makeAndAddView(ListView.java:1727)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.widget.ListView.fillSpecific(ListView.java:1272)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.widget.ListView.layoutChildren(ListView.java:1591)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.widget.AbsListView.onLayout(AbsListView.java:1147)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.view.View.layout(View.java:7034)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.view.View.layout(View.java:7034)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.widget.RelativeLayout.onLayout(RelativeLayout.java:909)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.view.View.layout(View.java:7034)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.widget.FrameLayout.onLayout(FrameLayout.java:333)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.view.View.layout(View.java:7034)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.widget.FrameLayout.onLayout(FrameLayout.java:333)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.view.View.layout(View.java:7034)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.view.ViewRoot.performTraversals(ViewRoot.java:1049)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.view.ViewRoot.handleMessage(ViewRoot.java:1744)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.os.Handler.dispatchMessage(Handler.java:99)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.os.Looper.loop(Looper.java:143)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at android.app.ActivityThread.main(ActivityThread.java:4914)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at java.lang.reflect.Method.invokeNative(Native Method)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at java.lang.reflect.Method.invoke(Method.java:521)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)</p> <p>08-26 14:35:17.735: ERROR/AndroidRuntime(24173): at dalvik.system.NativeStart.main(Native Method)</p> </blockquote> <p>And this is the dumpStack from getCount():</p> <blockquote> <p>08-26 14:35:17.615: WARN/System.err(24173): java.lang.Throwable: stack dump</p> <p>08-26 14:35:17.695: DEBUG/dalvikvm(24173): GC_FOR_MALLOC freed 19264 objects / 1052704 bytes in 78ms</p> <p>08-26 14:35:17.695: WARN/System.err(24173): at java.lang.Thread.dumpStack(Thread.java:618)</p> <p>08-26 14:35:17.705: WARN/System.err(24173): at AgendaAdapter.getCount(AgendaAdapter.java:31)</p> <p>08-26 14:35:17.705: WARN/System.err(24173): at android.widget.ListView.layoutChildren(ListView.java:1491)</p> <p>08-26 14:35:17.705: WARN/System.err(24173): at android.widget.AbsListView.onLayout(AbsListView.java:1147)</p> <p>08-26 14:35:17.705: WARN/System.err(24173): at android.view.View.layout(View.java:7034)</p> <p>08-26 14:35:17.705: WARN/System.err(24173): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)</p> <p>08-26 14:35:17.705: WARN/System.err(24173): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)</p> <p>08-26 14:35:17.705: WARN/System.err(24173): at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)</p> <p>08-26 14:35:17.705: WARN/System.err(24173): at android.view.View.layout(View.java:7034)</p> <p>08-26 14:35:17.705: WARN/System.err(24173): at android.widget.RelativeLayout.onLayout(RelativeLayout.java:909)</p> <p>08-26 14:35:17.705: WARN/System.err(24173): at android.view.View.layout(View.java:7034)</p> <p>08-26 14:35:17.715: WARN/System.err(24173): at android.widget.FrameLayout.onLayout(FrameLayout.java:333)</p> <p>08-26 14:35:17.715: WARN/System.err(24173): at android.view.View.layout(View.java:7034)</p> <p>08-26 14:35:17.715: WARN/System.err(24173): at android.widget.FrameLayout.onLayout(FrameLayout.java:333)</p> <p>08-26 14:35:17.715: WARN/System.err(24173): at android.view.View.layout(View.java:7034)</p> <p>08-26 14:35:17.715: WARN/System.err(24173): at android.view.ViewRoot.performTraversals(ViewRoot.java:1049)</p> <p>08-26 14:35:17.715: WARN/System.err(24173): at android.view.ViewRoot.handleMessage(ViewRoot.java:1744)</p> <p>08-26 14:35:17.715: WARN/System.err(24173): at android.os.Handler.dispatchMessage(Handler.java:99)</p> <p>08-26 14:35:17.715: WARN/System.err(24173): at android.os.Looper.loop(Looper.java:143)</p> <p>08-26 14:35:17.715: WARN/System.err(24173): at android.app.ActivityThread.main(ActivityThread.java:4914)</p> <p>08-26 14:35:17.715: WARN/System.err(24173): at java.lang.reflect.Method.invokeNative(Native Method)</p> <p>08-26 14:35:17.715: WARN/System.err(24173): at java.lang.reflect.Method.invoke(Method.java:521)</p> <p>08-26 14:35:17.715: WARN/System.err(24173): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)</p> <p>08-26 14:35:17.715: WARN/System.err(24173): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)</p> <p>08-26 14:35:17.715: WARN/System.err(24173): at dalvik.system.NativeStart.main(Native Method)</p> </blockquote> <p>Thus it is called from the <code>ListView</code>, but how can it be called after <code>onPause()</code> of the activity?</p>

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