myButton.setOnClickListener(new View.OnClickListener() {

<?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" >

    <Button
        android:id="@+id/button1"
        android:layout_width="212dp"
        android:layout_height="wrap_content"
        android:layout_weight="0.21"
        android:text="Button" />

</LinearLayout>

package com.skpack.myClickListener;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MyClickListenerActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        Button myButton = (Button) findViewById(R.id.button1);
        
        myButton.setOnClickListener(new View.OnClickListener() {
         
        public void onClick(View v) {
         
        Toast.makeText(MyClickListenerActivity.this, "Button clicked! (MyClickListenerActivity)", Toast.LENGTH_SHORT).show();
         
        }
         
        });
    }
}