button in android example

As we know that in any technology, if you want to apply some functionality to the UI on the user interaction then best way is to use Button. In android, we can use two type of buttons. i.e

Button
ImageButton.

In this tutorial, i am going to tell you about how to implement the button in android. I will use an example so that you could easily understand the concept. In my example, I have used two buttons so that you can compare their functionality. These are the steps:

Step1:

First of all you have to make the UI for your project. I will not tell you to make new prject and all that because it is already given in the first tutorial. If you don't know how to make a new project then visit

Getting started with android .So lets make the UI. You can use Drag and drop method or just copy and paste the following code into your layout file which is in layout/activity_main.xml

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=".MainActivity" >

<Button

android:id="@+id/btn1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentTop="true"

android:layout_centerHorizontal="true"

android:layout_marginTop="90dp"

android:text="Button 1" />

<Button

android:id="@+id/btn2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@+id/btn1"

android:layout_below="@+id/btn1"

android:layout_marginTop="86dp"

android:text="Button 2" />

</RelativeLayout>

Step 2:

Now you UI is ready. Now add the functionality to the UI. Follow these steps in mainActivity.java file

Make objects of Button.

Button btn1,btn2;

Initialize the objects of button in Oncreate method

//Initilize the objects and add reference.

btn1=(Button)findViewById(R.id.btn1);

btn2=(Button)findViewById(R.id.btn2);

set onclickListener on both buttons

Your final code in mainActivity.java file will be as following:

mainActivity.java

package com.AT4U.button_example;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity {

//creating object for two buttons

Button btn1,btn2;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//Initilize the objects and add reference.

btn1=(Button)findViewById(R.id.btn1);

btn2=(Button)findViewById(R.id.btn2);

//btn1 functionaliy

btn1.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

Toast.makeText(getApplicationContext(), "btn1 is clicked", Toast.LENGTH_SHORT).show();

}

});

//btn2 functionaliy

btn2.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

Toast.makeText(getApplicationContext(), "btn2 is clicked", Toast.LENGTH_SHORT).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;

}

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