[android-developers] Bold a row in ListView programmatically

I have created a ListView with rows of text+icon. On certain
conditions, I want to BOLD the text on a particular row.

I first tried it out in the On-Click and it works.

myListView.setOnItemClickListener(new OnItemClickListener(){
public void onItemClick(AdapterView<?> parent, View v, int
position,long id) {
TextView b1 = (TextView) v.findViewById
(R.id.itemText);
b1.setTypeface(null, Typeface.BOLD);
Log.i(TAG, "onItemClick ..."+b1.getText());
//b1.setText("testing");
}});

However when I put the codes into a function and call it (I created a
menu item to activate it), the text does not become bold.

public void setBold() {
View v = (View) mySimpleAdapter.getView(2, null,
myListView); // get row 3
TextView tv2 = (TextView) v.findViewById(R.id.itemText);
tv2.setTypeface(null, Typeface.BOLD);
Log.i(TAG, "setBold ..."+tv2.getText());
tv2.setText("testing");
//v.invalidate();
//mySimpleAdapter.notifyDataSetChanged();
}

The Log in setBold function does show up, so I believe the codes in
setBold() are being executed. What is so different about on-Click that
refreshed the ListView but not through the function?

I am using the default ListView and a SimpleAdapter to populate the
List.

Is there something I should add to the setBold() to refresh the view
or is there other better way to change the textView to bold?

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