让【改变的TextView】跟随鼠标点击出现的有关问题

public class MoveViews extends Activity {    public static final String[] value = {            "Hello",            "Hello Kitty",            "中国，我爱你，我的祖国！！！",            "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" };    int length = value.length;    TextView tv;    int i = 0;    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        tv = (TextView) this.findViewById(R.id.showtext);    }    public boolean onTouchEvent(MotionEvent event) {        if (event.getAction() == MotionEvent.ACTION_DOWN) {            tv.layout((int) event.getX(), (int) event.getY(), (int) event                    .getX()                    + tv.getWidth(), (int) event.getY() + tv.getHeight());            tv.setVisibility(View.VISIBLE);            tv.setText(value[i]);            i++;            if (i >= value.length) {                i = 0;            }        }        return false;    }}

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:id="@+id/layout"    ><EditText    android:id="@+id/showtext"      android:layout_width="100dp"     android:layout_height="wrap_content"    android:visibility="invisible"    /></RelativeLayout>