Android Application Development Cookbook: 93 Recipes for Building Winning Apps

android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ToggleButton"
android:onClick="onToggle" />

The most common way to handle a Button event is to implement its 
onClick
event. There are a few 
ways to do this:
package net.learn2develop.buttons;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
import android.widget.ToggleButton;
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//---Button view---
Button btn = (Button) findViewById(R.id.button3); 
btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Toast.makeText(getBaseContext(), "Button 3 was clicked!", 
Toast.LENGTH_SHORT).show();
}
});
//---the two buttons are wired to the same event handler--- 
Button btn4 = (Button) findViewById(R.id.button4);
btn4.setOnClickListener(btnListener);
Button btn5 = (Button) findViewById(R.id.button5); 
btn5.setOnClickListener(btnListener);
}
//---create an anonymous class to act as a button click listener---
private OnClickListener btnListener = new OnClickListener() {
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ChAPter 2
using Views to design the user interFAce
public void onClick(View view)
{
Toast.makeText(getBaseContext(),