Detect Touch Event, test on Custom View

package com.TestSingleTouch;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;

public class TestSingleTouch extends Activity {

public class TouchView extends View {

 private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
 private float x, y;
 boolean touching = false;

public TouchView(Context context) {
 super(context);
 // TODO Auto-generated constructor stub
}

@Override
protected void onDraw(Canvas canvas) {
 // TODO Auto-generated method stub
 if(touching){
  paint.setStyle(Paint.Style.STROKE);
  paint.setStrokeWidth(1);
  paint.setColor(Color.WHITE);
  canvas.drawCircle(x, y, 50f, paint);
 }
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 // TODO Auto-generated method stub
 setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec),
       MeasureSpec.getSize(heightMeasureSpec));
}

@Override
public boolean onTouchEvent(MotionEvent event) {
 // TODO Auto-generated method stub

 int action = event.getAction();
 switch(action){
 case MotionEvent.ACTION_MOVE:
  x = event.getX();
  y = event.getY();
  touching = true;
  break;
 case MotionEvent.ACTION_DOWN:
  x = event.getX();
  y = event.getY();
  touching = true;
  break;
 case MotionEvent.ACTION_UP:
  touching = false;
  break;
 default:
  touching = false;
 }
 invalidate();
 return true;
}

}

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(new TouchView(this));

}

}

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