implementing View.OnClickListener for multiple button events...

BaseActivity.java

package com.android.sample.events;

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



public class BaseActivity extends Activity implements View.OnClickListener 
{
	// declare variable to represent our components...
	Button b1,b2,b3,b4;
	TextView t1;
  
	/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        // inside this method we reference our buttons, textview and add event listeners...
        setupViews();
        
        
    }

	private void setupViews() 
	{
			b1=(Button)findViewById(R.id.b_1_id);
			b2=(Button)findViewById(R.id.b_2_id);
			b3=(Button)findViewById(R.id.b_3_id);
			b4=(Button)findViewById(R.id.b_4_id);
			
			t1=(TextView)findViewById(R.id.t_id);
			
			b1.setOnClickListener(this);
			b2.setOnClickListener(this);
			b3.setOnClickListener(this);
			b4.setOnClickListener(this);
	}
	
	// this method is called when any of the buttons is clicked...
	// the text on the TextView is set according the button pressed...
	
	@Override
	public void onClick(View v) 
	{
		switch(v.getId())
		{
			case R.id.b_1_id:
			t1.setText("Button 1 is pressed");
			break;
		
			case R.id.b_2_id:
				t1.setText("Button 2 is pressed");
				break;
		
			case R.id.b_3_id:
				t1.setText("Button 3 is pressed");
				break;
		
	case R.id.b_4_id:
		t1.setText("Button 4 is pressed");
		break;
		
		}
	
		
	}
	
}