CheckBox In Android

activity_main.xml
------------------

<LinearLayout 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:orientation="vertical"
    android:id="@+id/hello"
    tools:context=".MainActivity">

    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="CheckBox"
        android:id="@+id/checkBox"
        android:layout_gravity="center_horizontal"
        android:checked="false"
        android:layout_marginTop="10dp" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Check"
        android:id="@+id/button"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="15dp" />
</LinearLayout>

MainActivity.java
--------------------

package com.android.anil.checkbox;



import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.Button;

import android.widget.CheckBox;

import android.widget.Toast;



public class MainActivity extends AppCompatActivity {

    CheckBox cb1;

    Button b1;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        cb1=(CheckBox)findViewById(R.id.checkBox);

        b1=(Button)findViewById(R.id.button);

        b1.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                if(cb1.isChecked()){

         Toast.makeText(getApplicationContext(),"CheckBox is Checked",5000).show();

                    

                }else{

       Toast.makeText(getApplicationContext(),"CheckBox is UnChecked",5000).show();



                }

            }

        });

        

    }



}

Output is :
----------