Resize the ListView Default Row Size in Android

1. I had just made my own layout in R/layout as mylist.xml

<?xml version="1.0" encoding="utf-8"?>

    <TextView xmlns:android="http://schemas.android.com/apk/res/android"

              android:layout_width="fill_parent"

              android:layout_height="wrap_content"

              android:textSize="7pt"    

              android:paddingTop="2dip" 

              android:paddingBottom="2dip"

              android:textColor="@android:color/black"   

              android:gravity="center"/>

2.and then i changed my main.xml to show a listview. like,

<LinearLayout android:orientation="horizontal"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent">

        <ListView android:layout_width="fill_parent"

            android:layout_height="wrap_content"

            android:id="@+id/my_list"/>

    </LinearLayout>

And at last i have my activity file like

    // all the stuff

    // i cant put my code here,na?:)

   //Its simple. just change layout to ours

    ListView list;

    list = (ListView)findViewById(R.id.my_list);

    ArrayAdapter<CharSequence> list_adapter= ArrayAdapter.createFromResource(

            this, R.array.my_array, R.layout.mylist);

    my_list.setAdapter(list_adapter);