public void onClick(View v) {
  switch(v.getId()){
    case R.id.Button1:
      break;
    case R.id.Button2:
      break;
    case R.id.Button3:
      break;
//....
  }
}
	
@Override
public void onClick(View view) {
    int Id = view.getId();
}
	
Button button1 = (Button)findViewById(R.id.Button01);
    Button button2 = (Button)findViewById(R.id.Button02);

    private class myListener implements OnClickListener
    {

        @Override
        public void onClick(View arg0) {

            if (arg0 == button1)
            {
                //button 1 clicked
            }
            else if (arg0 == button2)
            {
                //button 2 clicked
            }
            //etc 
        }

    }

    myListener listener = new myListener();

    button1.setOnClickListener(listener);
    button2.setOnClickListener(listener);
	
<Button android:id="@+id/my_button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/my_button_text"/>
	
final Button button1 = (Button) findViewById(R.id.my_button1);
     button.setOnClickListener(new View.OnClickListener() {
          public void onClick(View v) {
               // Perform action on click
          }
     });