Use Button in Android

Button plays a very important role in app development. It would be next to impossible to design an app without using a button. Let's have a look at this important component in this post.
In this tutorial, we shall learn how to display a normal button, add a click listener and open a URL in your Android’s internet browser, when a user clicks on the button.

1. Add Button

Let us first add the button in the layout file. Open “res/layout/main.xml” file, and add a button.
File : res/layout/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:gravity="center"

    android:orientation="vertical" >

   

<Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Go to mobilitytutorials blog" />




</LinearLayout>

2. Code

We shall attach a click listener to the button so that when a user clicks on it, mobile browser is opened and the URL: "http://mobilitytutorials.blogspot.in" is displayed.
File : MainActivity.java

package com.endeavour.buttontutorial;



import android.app.Activity;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;

import android.widget.Button;

import android.view.View;

import android.view.View.OnClickListener;



public class MainActivity extends Activity {



       Button button;



       @Override




       public void onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              setContentView(R.layout.main);

              addListenerOnButton();



       }



       public void addListenerOnButton(){



              button = (Button)findViewById(R.id.button1);

              button.setOnClickListener(new OnClickListener() {



                     @Override

                     public void onClick(View arg0) {




                       Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://mobilitytutorials.blogspot.in/p/index.html"));




                       startActivity(browserIntent);

      }

    });

  }

}

3. Output

The following output shall be displayed:

1. Button on the home screen

2. Clicking the button takes you to the stated URL.