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Working with Multiple Button Android Example

Multiple Button 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: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.desktop.buttonexample.MainActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="button 1"
        android:id="@+id/button1"
        android:layout_marginTop="53dp"
        android:layout_alignParentTop="true"
        android:layout_alignLeft="@+id/button2"
        android:layout_alignStart="@+id/button2" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="button 2"
        android:onClick="clickme"
        android:id="@+id/button2"
        android:layout_below="@+id/button1"
        android:layout_centerHorizontal="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="button 3"
        android:id="@+id/button3"
        android:layout_below="@+id/button2"
        android:layout_centerHorizontal="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="button 4"
        android:id="@+id/button4"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="button 5"
        android:id="@+id/button5"
        android:layout_below="@+id/button4"
        android:layout_centerHorizontal="true" />
</RelativeLayout>

MainActivity.java
package com.example.desktop.buttonexample;

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

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    Button btn1,btn2,btn3,btn4,btn5;

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

        btn1 = (Button) findViewById(R.id.button1);
        btn2 = (Button) findViewById(R.id.button2);
        btn3 = (Button) findViewById(R.id.button3);
        btn4 = (Button) findViewById(R.id.button4);
        btn5 = (Button) findViewById(R.id.button5);

        btn1.setOnClickListener(this);
        btn2.setOnClickListener(this);
        btn3.setOnClickListener(this);
        btn4.setOnClickListener(this);
        btn5.setOnClickListener(this);
    }

    public void onClick(View v) {
        switch (v.getId()){
            case R.id.button1:
                Toast.makeText(this,"Button 1 is working",Toast.LENGTH_SHORT)
                        .show();
                break;
            case R.id.button2:
                Toast.makeText(this,"Button 2 is working",Toast.LENGTH_SHORT)
                        .show();
                break;
            case R.id.button3:
                Toast.makeText(this,"Button 3 is working",Toast.LENGTH_SHORT)
                        .show();
                break;
            case R.id.button4:
                Toast.makeText(this,"Button 4 is working",Toast.LENGTH_SHORT)
                        .show();
                break;
            case R.id.button5:
                Toast.makeText(this,"Button 5 is working",Toast.LENGTH_SHORT)
                        .show();
                break;
        }
    }
}

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