how to change text size of listview

Go into layout folder and create a new xml file named mytextview.xml(whatever you want to name it)

    <?xml version="1.0" encoding="utf-8"?>
    <TextView xmlns:android="http://schemas.android.com/apk/res/android" 
     android:id="@android:id/text1"  
            android:paddingTop="2dip" 
            android:paddingBottom="3dip" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content"
        android:textSize="2dp" /> 

and in the code

    setListAdapter(new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, results));

change it to

    setListAdapter(new ArrayAdapter<String>(this,
            R.layout.mytextview, results));