Selecting a button color of the screen will change.

Q8.Create an application with three buttons vertically aligned, on selecting a button color of the screen will change.

Android Program :

 

Activity_main.xml

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

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

    xmlns:tools="http://schemas.android.com/tools"

    android:id="@+id/layout"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

   android:orientation="horizontal"

    tools:context="com.kishanhaldar.program8.MainActivity">

    <Button

        android:text="Red"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/red"

        android:layout_weight="1"

        android:layout_gravity="center"

        android:onClick="mycolor"/>

    <Button

        android:text="Blue"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/blue"

        android:layout_weight="1"

        android:layout_gravity="center"

        android:onClick="mycolor"/>

    <Button

        android:text="Green"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/green"

        android:layout_weight="1"

        android:layout_gravity="center"

        android:onClick="mycolor"/>

</LinearLayout>

MainActivity.java

package com.kishanhaldar.program8;

 import android.graphics.Color;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity {

  LinearLayout l;

    Button r,b,g;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        l=(LinearLayout)findViewById(R.id.layout);

    }

    public void mycolor(View v){

        if(v.getId()==R.id.red){

            l.setBackgroundColor(Color.RED);

        }

        if(v.getId()==R.id.blue){

            l.setBackgroundColor(Color.BLUE);

        }

        if(v.getId()==R.id.green){

            l.setBackgroundColor(Color.GREEN);

        }

    }

}