Implement OnTouchListener to handle multi-touch event

In this exercise, we will implement our OnTouchListener to handle the following MotionEvent:
ACTION_DOWN: A pressed gesture has started, the motion contains the initial starting location.
ACTION_POINTER_DOWN: A non-primary pointer has gone down.
ACTION_MOVE: A change has happened during a press gesture (between ACTION_DOWN and ACTION_UP).
ACTION_UP: A pressed gesture has finished.
ACTION_POINTER_UP: A non-primary pointer has gone up.

It will be used to implement our pinch zoom in coming exercise.

package com.exercise.AndroidTouchPinchZoom;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.TextView;

public class AndroidTouchPinchZoomActivity extends Activity {
 
 TextView myTouchEvent;
 ImageView myImageView;
 Bitmap bitmap;
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       myTouchEvent = (TextView)findViewById(R.id.touchevent);
       myImageView = (ImageView)findViewById(R.id.imageview);
      
       bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
       myImageView.setImageBitmap(bitmap);
      
       myImageView.setOnTouchListener(MyOnTouchListener);
   }
  
   OnTouchListener MyOnTouchListener
   = new OnTouchListener(){

  @Override
  public boolean onTouch(View view, MotionEvent event) {
   // TODO Auto-generated method stub
   
   switch(event.getAction() & MotionEvent.ACTION_MASK){
   case MotionEvent.ACTION_DOWN:
    //A pressed gesture has started, the motion contains the initial starting location.
    myTouchEvent.setText("ACTION_DOWN");
    break;
   case MotionEvent.ACTION_POINTER_DOWN:
    //A non-primary pointer has gone down.
    myTouchEvent.setText("ACTION_POINTER_DOWN");
    break;
   case MotionEvent.ACTION_MOVE:
    //A change has happened during a press gesture (between ACTION_DOWN and ACTION_UP).
    myTouchEvent.setText("ACTION_MOVE");
    break;
   case MotionEvent.ACTION_UP:
    //A pressed gesture has finished.
    myTouchEvent.setText("ACTION_UP");
    break;
   case MotionEvent.ACTION_POINTER_UP:
    //A non-primary pointer has gone up.
    myTouchEvent.setText("ACTION_POINTER_UP");
    break;
   }
   
   return true;
  }
    
   };
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:orientation="vertical" >

   <TextView
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:text="@string/hello" />
   <TextView
       android:id="@+id/touchevent"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content" />
   <ImageView
       android:id="@+id/imageview"
       android:layout_gravity="center"
       android:layout_width="fill_parent"
       android:layout_height="fill_parent"
       android:scaleType="center" />

</LinearLayout>

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