OnTouch Listener

OnTouchListener: Interface definition for a callback to be invoked when a touch event is dispatched to this view. The callback will be invoked before the touch event is given to the view.

onTouch(View v, MotionEvent event): Called when a touch event is dispatched to a view. This allows listeners to get a chance to respond before the target view. 

The MotionEvent object containing full information about the event.

MainActivity.java :

public class MainActivity extends Activity {

      

       ImageView iv;

       @Override

       protected void onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              setContentView(R.layout.activity_main);

              iv = (ImageView) findViewById(R.id.imageView1);

              iv.setOnTouchListener(new OnTouchListener() {

                    

                     @Override

                     public boolean onTouch(View v, MotionEvent event) {

                           if(event.getAction() == MotionEvent.ACTION_DOWN) {

                       // Button was pressed, change button background

                       iv.setImageResource(R.drawable.flagn);

                       Toast.makeText(MainActivity.this, "I love my India !", Toast.LENGTH_SHORT).show();

                       return true;

                   }

                           return false;

                     }

              });

             

             

             

       }

       @Override

       public boolean onCreateOptionsMenu(Menu menu) {

              // Inflate the menu; this adds items to the action bar if it is present.

              getMenuInflater().inflate(R.menu.main, menu);

              return true;

       }

}

activity_main.xml :

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

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".MainActivity" >

    <ImageView

        android:id="@+id/imageView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true"

        android:layout_marginLeft="96dp"

        android:layout_marginTop="40dp"

        android:src="@drawable/flag" />

</RelativeLayout>

 

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