Working with Button

Demo:

1)main.xml:

<?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:background="#5F04B4"

    android:orientation="vertical" >

    <Button

        android:id="@+id/button"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_gravity="center"

        android:layout_marginTop="150dp"

        android:onClick="onClick"

        android:text="Click Me" />

</LinearLayout>

2)Activity:

 

package com.venkool.button;

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;

public class ButtonActivity extends Activity implements OnClickListener {

      /** Called when the activity is first created. */

      Button button;

      @Override

      public void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);

            setContentView(R.layout.main);

            // set the UI

            button = (Button) findViewById(R.id.button);

            //set the Listener for button

            button.setOnClickListener(this);

      }

      public void onClick(View v) {

            // TODO Auto-generated method stub

            Toast.makeText(getApplicationContext(), "Button Clicked",

                        Toast.LENGTH_LONG).show();

      }

}

3)Download this project Click Here