How To Use Button In Android

Introduction:-
In this tutorial I'll show you how to use normal button, add a click listener , when user click on button open an URl on your android's browser.

Video Demo:-

Implementation:-

Create New Android Project 
1. Click File > New > Android Application Project 

• Add button in your activity_main.xml file 

<Button

        android:id="@+id/button1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginTop="200dp"

        android:text="@string/button" />

• Add listener in your MainActivity.java file

private Button button;

// Add button listener

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

button.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri

.parse("http://www.androidfriction.blogspot.com"));

startActivity(browserIntent);

}

});

2. MainActivity.java (Paste this code in your MainActivity.java)

package com.example.buttoneample;

import android.support.v7.app.ActionBarActivity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;

public class MainActivity extends ActionBarActivity {
private Button button;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

// Add button listener
button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri
.parse("http://www.androidfriction.blogspot.com"));
startActivity(browserIntent);
}
});
}

@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;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

3. activity_main.xml (Paste this code in your activity_main.xml)

<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="com.example.buttoneample.MainActivity" >

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="200dp"
        android:text="@string/button" />

</RelativeLayout>

4. string.xml (Paste this code in your string.xml)

<resources>

    <string name="app_name">ButtonEample</string>

    <string name="hello_world">Hello world!</string>

    <string name="action_settings">Settings</string>

    <string name="button">Click Button</string>

</resources>

5. AndroidMenifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.buttoneample"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

Output:-

You can also download full source code with .zip file.

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OR you can also download .apk file.

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