Android Button Example

How to create button and code below see example:

Activity_main.XML :

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

 <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:paddingLeft="@dimen/activity_horizontal_margin" 

 android:paddingRight="@dimen/activity_horizontal_margin" 

 android:paddingTop="@dimen/activity_vertical_margin"     

 android:paddingBottom="@dimen/activity_vertical_margin" 

 tools:context="com.kiranapp.MainActivity">

 <Button 

  android:layout_width="wrap_content"         

  android:layout_height="wrap_content" 

  android:text="b1" 

  android:id="@+id/button" 

  android:layout_alignParentTop="true" 

  android:layout_centerHorizontal="true"         

  android:layout_marginTop="59dp" />

<Button 

  android:layout_width="wrap_content"         

  android:layout_height="wrap_content" 

  android:text="b2" 

  android:id="@+id/button2" 

  android:layout_below="@+id/button" 

  android:layout_alignStart="@+id/button" /> 

<Button         

  android:layout_width="wrap_content" 

  android:layout_height="wrap_content" 

  android:text="b3" 

  android:id="@+id/button3" 

  android:layout_centerVertical="true" 

  android:layout_alignStart="@+id/button2" />
</RelativeLayout>

MainActivity.java :

 
package com.kiranapp;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    Button b1,b2,b3; 

@Override 

 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
   b1 = (Button) findViewById(R.id.button);
   b2 = (Button) findViewById(R.id.button2);
   b3 = (Button) findViewById(R.id.button3);
   b1.setOnClickListener(this);
   b2.setOnClickListener(this);
   b3.setOnClickListener(this);

 } 

@Override 

 public void onClick(View view) {
  switch (view.getId()){
   case R.id.button:
Toast.makeText(MainActivity.this, "Button1 is working", Toast.LENGTH_SHORT).show();
  break;
 case R.id.button2:
Toast.makeText(MainActivity.this, "Button2 is working", Toast.LENGTH_SHORT).show();
 break;
 case R.id.button3:
Toast.makeText(MainActivity.this, "Button3 is working", Toast.LENGTH_SHORT).show();
 break;
  }
 }

}

Output :

Android Button fig:1

Android Button Example fig:2

Android Button Example fig:3