android button example

In this post we are going to see how to create a simple android application that contains two buttons and how to create the response for the button clicks.
Create a new android project named ButtonDemo in eclipse.
In  the activity_main.xml add two buttons as shown bellow.

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
   xmlns:tools="http://schemas.android.com/tools"  
   android:layout_width="match_parent"  
   android:layout_height="match_parent"  
   android:paddingBottom="@dimen/activity_vertical_margin"  
   android:paddingLeft="@dimen/activity_horizontal_margin"  
   android:paddingRight="@dimen/activity_horizontal_margin"  
   android:paddingTop="@dimen/activity_vertical_margin"  
   tools:context=".MainActivity" >  
   <Button  
     android:id="@+id/button2"  
     android:layout_width="fill_parent"  
     android:layout_height="wrap_content"  
     android:onClick="clickMeMethod"  
     android:text="@string/first_button" />  
   <Button  
     android:id="@+id/bn"  
     android:layout_width="wrap_content"  
     android:layout_height="wrap_content"  
     android:layout_below="@+id/button2"  
     android:layout_centerHorizontal="true"  
     android:layout_marginTop="39dp"  
     android:text="Click me too" />  
 </RelativeLayout>  

Now made the following changes in the MainActivity.java file which is on the package coming under the Src folder.

 package com.buttondemo;  
 import android.app.Activity;  
 import android.os.Bundle;  
 import android.view.Menu;  
 import android.view.View;  
 import android.view.View.OnClickListener;  
 import android.widget.Button;  
 import android.widget.Toast;  
 public class MainActivity extends Activity {  
      Button button;  
      @Override  
      protected void onCreate(Bundle savedInstanceState) {  
           super.onCreate(savedInstanceState);  
           setContentView(R.layout.activity_main);  
           button = (Button)findViewById(R.id.bn);  
           button.setOnClickListener(new OnClickListener() {  
                @Override  
                public void onClick(View v) {  
                     // TODO Auto-generated method stub  
                     Toast.makeText(getBaseContext(), "You click the CLICK ME TOO button", Toast.LENGTH_LONG).show();  
                }  
           });  
      }  
      @Override  
      public boolean onCreateOptionsMenu(Menu menu) {  
           // Inflate the menu; this adds items to the action bar if it is present.  
           getMenuInflater().inflate(R.menu.main, menu);  
           return true;  
      }  
      public void clickMeMethod(View v)  
      {  
           Toast.makeText(getBaseContext(), "You just click CLICK ME button", Toast.LENGTH_LONG).show();  
      }  
 }  

Save the project and run.

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