Question

In my Activity there is a TabView with 3 Tabs , each tab has a ListView and a Button.
When i navigate the tabs using the D-Pad on the emulator there is no problem, but when i use the scroll-wheel(mouse) to navigate the view and then click in the View there is a ForceClose. I think its got something to do with “touchmodechange” but not sure how to handle this. Really appreciate any help…

12-23 19:14:25.352: ERROR/ActivityThread(116): Failed to find provider info for android.server.checkin
12-23 19:18:09.184: ERROR/AndroidRuntime(226): Uncaught handler: thread main exiting due to uncaught exception
12-23 19:18:09.224: ERROR/AndroidRuntime(226): java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread.
12-23 19:18:09.224: ERROR/AndroidRuntime(226):     at android.widget.ListView.layoutChildren(ListView.java:1428)
12-23 19:18:09.224: ERROR/AndroidRuntime(226):     at android.widget.AbsListView.onTouchModeChanged(AbsListView.java:1888)
12-23 19:18:09.224: ERROR/AndroidRuntime(226):     at android.view.ViewTreeObserver.dispatchOnTouchModeChanged(ViewTreeObserver.java:591)
12-23 19:18:09.224: ERROR/AndroidRuntime(226):     at android.view.ViewRoot.ensureTouchModeLocally(ViewRoot.java:1877)
12-23 19:18:09.224: ERROR/AndroidRuntime(226):     at android.view.ViewRoot.ensureTouchMode(ViewRoot.java:1861)
12-23 19:18:09.224: ERROR/AndroidRuntime(226):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1652)
12-23 19:18:09.224: ERROR/AndroidRuntime(226):     at android.os.Handler.dispatchMessage(Handler.java:99)
12-23 19:18:09.224: ERROR/AndroidRuntime(226):     at android.os.Looper.loop(Looper.java:123)
12-23 19:18:09.224: ERROR/AndroidRuntime(226):     at android.app.ActivityThread.main(ActivityThread.java:4203)
12-23 19:18:09.224: ERROR/AndroidRuntime(226):     at java.lang.reflect.Method.invokeNative(Native Method)
12-23 19:18:09.224: ERROR/AndroidRuntime(226):     at java.lang.reflect.Method.invoke(Method.java:521)
12-23 19:18:09.224: ERROR/AndroidRuntime(226):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
12-23 19:18:09.224: ERROR/AndroidRuntime(226):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
12-23 19:18:09.224: ERROR/AndroidRuntime(226):     at dalvik.system.NativeStart.main(Native Method)



private void fillData(int tab)
    {
        Cursor cursor;
        Long millis;
        String tempstr;
        //query table and obtain cursor 
        if(tab==0)
            cursor=dbAdapter.getAllRemindersCursor();
        else if(tab==1)
            cursor=dbAdapter.getAutoRemindersCursors();
        else if(tab==2) 
            cursor=dbAdapter.getUserRemindersCursors();
        else
            cursor=dbAdapter.getAllRemindersCursor();

        results.clear();

        //populate the ArrayList using the cursor
        if(cursor!=null)
        {
            if(cursor.moveToFirst())
            {
                Log.d("Msg","Cursor at first item");
                Log.d("Msg",cursor.getCount()+" items in cursor");
                do
                {
                    millis=cursor.getLong(1);
                    tempstr=cursor.getString(2);
                    tempstr=" "+tempstr+"\n"+" "+dtf.format(millis);
                    results.add(tempstr);
                    category.add(cursor.getInt(4));
                    Log.d("Msg","message and type items added");
                }
                while(cursor.moveToNext());
            }
        }
        else
        {
            Log.d("Msg","Cursor is empty");
        }

        if(tab==0)
            lv1.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,results));
        else if(tab==1)
            lv2.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,results));
        else if(tab==2)
            lv3.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,results));
        else
            lv1.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,results));
    }

This method is called every time onTabChangedListener is triggered. Other wise there is
nothing much else at present in this Activity.

Answer 1

The problem is that you are sharing the same results List for all of your Adapters. This list is directly referenced inside the adapter, so when you switch a tab you’re updating the adapter on all of them (this is why you get an IllegalStateException). Instead of reusing the results variable, simply create a new one inside your filldata method, there’s no need (that I can see from the code above) to use the same one. I believe you could have also just used CursorAdapters and not bothered the intermediate List.