How to catch a click event on a button?

Question

.NET Developer here just getting started with Eclipse and Android.

Can someone show me in the simplest way possible, with the absolute fewest lines of code, how to D

Answer 1

All answers are based on anonymous inner class. We have one more way for adding click event for buttons as well as other components too.

An activity needs to implement View.OnClickListener interface and we need to override the onClick function. I think this is best approach compared to using anonymous class.

package com.pointerunits.helloworld;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity implements OnClickListener {
   private Button login;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      login = (Button)findViewById(R.id.loginbutton);
      login.setOnClickListener((OnClickListener) this);
      Log.i(DISPLAY_SERVICE, "Activity is created");

   }    

   @Override
   public boolean onCreateOptionsMenu(Menu menu) {

      getMenuInflater().inflate(R.menu.main, menu);
      return true;
    }

   @Override
   public void onClick(View v) {
     Log.i(DISPLAY_SERVICE, "Button clicked : " + v.getId());
   }
}