[Java for Android App Development] estex198:
I have an application with a listview consisting of child objects of type Product, a custom class I've created. I'm trying to set the text of a TextView object called tv_productName to the name of the object selected in the ListView. Im not sure whats going on but I get nothing whenever i click any of the ListView child objects, not even the 'Hello world!' toast.

The following code is in my onCreate() method in the main activity:

// Instantiate AsyncTask and execute the download of products_list.xml, then set ListView
ProductListDownloadTask download = new ProductListDownloadTask();
download.execute();

//TODO populate productName, shelfLife, defaultContainer each time selection changes

productsListView = (ListView)findViewById(R.id.productsListView);
tv_productName = (TextView)findViewById(R.id.tv_productName); // product name textview

productsListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> myAdapter, View myView, int position, long mylng) {
final Product listProduct = (Product) myAdapter.getItemAtPosition(position);
tv_productName.setText(listProduct.toString()); // Product object toString() returns name
Toast.makeText(getApplicationContext(), listProduct.toString(), Toast.LENGTH_SHORT).show();
Toast.makeText(getApplicationContext(), "Hello world!", Toast.LENGTH_SHORT).show();

}
});

This code is outside of the onCreate method, but still within the main activity class:

// This is called when doInBackground() is finished
protected void onPostExecute(Void result) {
//setup our ArrayAdapter using List<Product> and set it to the ListView.
mAdapter = new ProductsAdapter(MainActivity.this, -1, XMLParser.getProductsFromFile(MainActivity.this));
productsListView = (ListView)findViewById(R.id.productsListView);
productsListView.setAdapter(mAdapter);
Log.i("Products", "adapter size = " + mAdapter.getCount());

}

And here are the errors from the logcat:

03-17 21:47:04.960 4527-4527/com.estex.kc_app D/ViewGroup﹕ addInArray been called, this = android.widget.ListView{41c9d4e8 VFED.VC. .F....ID 370,390-688,880 #7f090062 app:id/productsListView}call stack =
java.lang.Throwable: addInArray
at android.view.ViewGroup.addInArray(ViewGroup.java:3786)
at android.view.ViewGroup.addViewInner(ViewGroup.java:3740)
at android.view.ViewGroup.addViewInLayout(ViewGroup.java:3687)
at android.widget.ListView.setupChild(ListView.java:1862)
at android.widget.ListView.makeAndAddView(ListView.java:1815)
at android.widget.ListView.fillDown(ListView.java:698)
at android.widget.ListView.fillFromTop(ListView.java:759)
at android.widget.ListView.layoutChildren(ListView.java:1645)
at android.widget.AbsListView.onLayout(AbsListView.java:2149)
at android.view.View.layout(View.java:15125)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1160)
at android.view.View.layout(View.java:15125)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:515)
at android.widget.FrameLayout.onLayout(FrameLayout.java:450)
at android.view.View.layout(View.java:15125)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.support.v7.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:502)
at android.view.View.layout(View.java:15125)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:515)
at android.widget.FrameLayout.onLayout(FrameLayout.java:450)
at android.view.View.layout(View.java:15125)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1888)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1742)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1651)
at android.view.View.layout(View.java:15125)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:515)
at android.widget.FrameLayout.onLayout(FrameLayout.java:450)
at android.view.View.layout(View.java:15125)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2323)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2029)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1192)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6231)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:788)
at android.view.Choreographer.doCallbacks(Choreographer.java:591)
at android.view.Choreographer.doFrame(Choreographer.java:560)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:774)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5292)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
at dalvik.system.NativeStart.main(Native Method)
03-17 21:47:04.962 4527-4527/com.estex.kc_app D/ListView﹕ mSelectorRect.setEmpty in layoutChildren this=android.widget.ListView{41c9d4e8 VFED.VC. .F....ID 370,390-688,880 #7f090062 app:id/productsListView}
03-17 21:47:04.969 4527-4527/com.estex.kc_app D/OpenGLRenderer﹕ prepareDirty (0.00, 0.00, 720.00, 1280.00) opaque 1 <0x60561530>
03-17 21:47:04.979 4527-4527/com.estex.kc_app D/OpenGLRenderer﹕ finish <0x60561530>
03-17 21:47:04.981 4527-4527/com.estex.kc_app V/InputMethodManager﹕ START INPUT: android.widget.ListView{41c9d4e8 VFED.VC. .F....I. 370,390-688,880 #7f090062 app:id/productsListView} ic=null tba=android.view.inputmethod.EditorInfo@41cfb370 controlFlags=#100
03-17 21:47:50.987 4527-4527/com.estex.kc_app D/ActivityThread﹕ ACT-AM_ON_PAUSE_CALLED ActivityRecord{41c3cd68 token=android.os.BinderProxy@41c3c598 {com.estex.kc_app/com.estex.kc_app.MainActivity}}
03-17 21:47:51.011 4527-4527/com.estex.kc_app D/ActivityThread﹕ ACT-PAUSE_ACTIVITY handled : 0 / android.os.BinderProxy@41c3c598
03-17 21:47:51.012 4527-4527/com.estex.kc_app D/ActivityThread﹕ ACT-STOP_ACTIVITY_SHOW handled : 0 / android.os.BinderProxy@41c3c598
03-17 21:47:51.080 4527-4527/com.estex.kc_app V/InputMethodManager﹕ START INPUT: android.widget.ListView{41c9d4e8 VFED.VC. .F....I. 370,390-688,880 #7f090062 app:id/productsListView} ic=null tba=android.view.inputmethod.EditorInfo@41ce00c0 controlFlags=#100
03-17 21:47:56.342 4527-4527/com.estex.kc_app D/AbsListView﹕ onWindowFocusChanged: hasWindowFocus=false, this=android.widget.ListView{41c9d4e8 VFED.VC. .F....I. 370,390-688,880 #7f090062 app:id/productsListView}
03-17 21:48:02.609 4527-4542/com.estex.kc_app D/dalvikvm﹕ threadid=12: exiting
03-17 21:48:02.609 4527-4542/com.estex.kc_app D/dalvikvm﹕ threadid=12: bye!

I should probably also mention that I am using a custom ArrayAdapter class to generate the view objects, with each object using a radio button Here is that code:

@Override
public View getView(int pos, View convertView, ViewGroup parent){
RelativeLayout row = (RelativeLayout)convertView;
if(row == null){
//No recycled View, we have to inflate one.
LayoutInflater inflater = (LayoutInflater)parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = (RelativeLayout)inflater.inflate(R.layout.row_product, null);
}

//Get our View Reference
RadioButton r = (RadioButton)row.findViewById(R.id.productListItem);

/* Set the relevant text in our RadioButton
* a.) When a RadioButton is checked we must call notifyDataSetChanged(), so that all views get updated.
* b.) When a RadioButton is checked we must set a selectedPosition, to keep track of which RadioButton is selected
* c.) Views are recycled inside ListViews. Therefore, their absolute position changes in the ListView.
* Therefore, inside ListAdapter#getView(), we must call setTag() on each RadioButton.
* This allows us to determine the current position of the RadioButton in the list when the RadioButton is clicked.
* RadioButton#setChecked() must be updated inside getView() for new or pre-existing Views. */

r.setText(getItem(pos).toString());
r.setChecked(pos == selectedPosition);
r.setTag(pos);
r.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
selectedPosition = (Integer)view.getTag();
notifyDataSetChanged();
}
});