Understand Menu option.
i. Create an application that will change color of the screen, based on selected options from the menu.


MainActivity.java

package com.example.assignment7;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Color;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        final Button b1=(Button)findViewById(R.id.btnRed);

        final Button b2=(Button)findViewById(R.id.btnBlue);

        final Button b3=(Button)findViewById(R.id.btnPink);

        final Button b4=(Button)findViewById(R.id.btnGreen);

        final Button b5=(Button)findViewById(R.id.btnOrange);

        final Button b6=(Button)findViewById(R.id.btnYellow);

        b1.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                setMyScreenColor(Color.RED);

            }

        });

        b2.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                setMyScreenColor(Color.BLUE);

            }

        });

        b3.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                setMyScreenColor(0xFFFFC0CB);

            }

        });

        b4.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                setMyScreenColor(Color.GREEN);

            }

        });

        b5.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                setMyScreenColor(0xFFFF8300);

            }

        });

        b6.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                setMyScreenColor(Color.YELLOW);

            }

        });

    }

    public  void  setMyScreenColor(int color){

        View view=this.getWindow().getDecorView();

        view.setBackgroundColor(color);

    }

}

activity_main.xml

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

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

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

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".MainActivity">

    <Button

        android:id="@+id/btnRed"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Red"

        android:textSize="24sp"

        app:layout_constraintBaseline_toBaselineOf="@+id/btnBlue"

        app:layout_constraintEnd_toStartOf="@+id/btnBlue"

        app:layout_constraintHorizontal_bias="0.5"

        app:layout_constraintStart_toStartOf="parent" />

    <Button

        android:id="@+id/btnBlue"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Blue"

        android:textSize="24sp"

        app:layout_constraintBaseline_toBaselineOf="@+id/btnPink"

        app:layout_constraintEnd_toStartOf="@+id/btnPink"

        app:layout_constraintHorizontal_bias="0.5"

        app:layout_constraintStart_toEndOf="@+id/btnRed" />

    <Button

        android:id="@+id/btnPink"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginBottom="28dp"

        android:text="pink"

        android:textSize="24sp"

        app:layout_constraintBottom_toTopOf="@+id/btnYellow"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintHorizontal_bias="0.5"

        app:layout_constraintStart_toEndOf="@+id/btnBlue" />

    <Button

        android:id="@+id/btnGreen"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginBottom="40dp"

        android:text="green"

        android:textSize="24sp"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintEnd_toStartOf="@+id/btnOrange"

        app:layout_constraintHorizontal_bias="0.5"

        app:layout_constraintStart_toStartOf="parent" />

    <Button

        android:id="@+id/btnOrange"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="orange"

        android:textSize="24sp"

        app:layout_constraintBaseline_toBaselineOf="@+id/btnGreen"

        app:layout_constraintEnd_toStartOf="@+id/btnYellow"

        app:layout_constraintHorizontal_bias="0.5"

        app:layout_constraintStart_toEndOf="@+id/btnGreen" />

    <Button

        android:id="@+id/btnYellow"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="yellow"

        android:textSize="24sp"

        app:layout_constraintBaseline_toBaselineOf="@+id/btnOrange"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintHorizontal_bias="0.5"

        app:layout_constraintStart_toEndOf="@+id/btnOrange" />

</androidx.constraintlayout.widget.ConstraintLayout>




Output

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