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    CheckBox Example

    checkbox
    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.blogspot.help2computer.checkbox.MainActivity">

        <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="CheckBox"
            android:id="@+id/checkBox"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="136dp"
            android:checked="false" />
    </RelativeLayout>

    MainActivity.java
    package com.blogspot.help2computer.checkbox;
    
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.widget.CheckBox;
    import android.widget.CompoundButton;
    import android.widget.Toast;
    
    public class MainActivity extends AppCompatActivity {
    
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            CheckBox checkBox = (CheckBox)findViewById(R.id.checkBox);
            checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                    if (isChecked){
                        Toast.makeText(MainActivity.this,"Checked",Toast.LENGTH_SHORT)
                                .show();
                    }
                    else {
                        Toast.makeText(MainActivity.this,"Not Checked",Toast.LENGTH_SHORT)
                                .show();
                    }
                }
            });
    
        }
    }

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