Check Box Button Handling-Android Studio.

CheckBox Tutorial With Example In Android Studio. In Android, CheckBox is a type of two state button either unchecked or checked in Android. Or you can say it is a type of on/off switch that can be toggled by the users. CompoundButton is the parent class of CheckBox class.

Lets write a simple example for checkBox, whenever we check the box it will display a Toast message. The code for MainActivity.java and acitivity.xml is shown below.

MainActivity.java 

package com.gcrt.checkboxhandling;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
    Button b1;
    CheckBox ck1,ck2,ck3,ck4;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        b1 = (Button) findViewById(R.id.button);
        ck1 = (CheckBox) findViewById(R.id.checkBox);
        ck2 = (CheckBox) findViewById(R.id.checkBox2);
        ck3 = (CheckBox) findViewById(R.id.checkBox3);
        ck4 = (CheckBox) findViewById(R.id.checkBox4);
    }
    public void click(View view) {
        CheckBox checkBox = (CheckBox) view;
        boolean isSelected = checkBox.isChecked();
            switch (view.getId()) {
                case R.id.checkBox:
                    if (isSelected == true) {
                    Toast.makeText(MainActivity.this, "APPLE IS SELECTED", Toast.LENGTH_SHORT).show();
                    }
                    break;
                case R.id.checkBox2:
                    if (isSelected == true) {
                        Toast.makeText(MainActivity.this, "MOTO G IS SELECTED", Toast.LENGTH_SHORT).show();
                    }
                    break;
                case R.id.checkBox3:
                    if (isSelected == true) {
                        Toast.makeText(MainActivity.this, "REDME IS SELECTED", Toast.LENGTH_SHORT).show();
                    }
                    break;
                case R.id.checkBox4:
                    if (isSelected == true) {
                        Toast.makeText(MainActivity.this, "NOKIA IS SELCTED", Toast.LENGTH_SHORT).show();
                    }
                    break;
            }
        }
    public void clicked(View view) {
        if (ck1.isChecked()== false || ck4.isChecked() == false || ck2.isChecked() == false || ck3.isChecked() == false) {
            Toast.makeText(MainActivity.this, "Select at least one", Toast.LENGTH_SHORT).show();
        }
        }
    }

acitivity.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:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    android:background="#FF9"
   android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="APPLE"
        android:layout_marginTop="30dp"
        android:textSize="60px"
        android:onClick="click"
        android:id="@+id/checkBox" />
    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="MOTO G"
        android:layout_marginTop="30dp"
        android:onClick="click"
        android:textSize="60px"
       android:id="@+id/checkBox2" />
    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="REDMI"
        android:layout_marginTop="20dp"
        android:onClick="click"
        android:textSize="60px"
        android:id="@+id/checkBox3" />
    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="NOKIA"
        android:layout_marginTop="20dp"
        android:onClick="click"
        android:textSize="60px"
       android:id="@+id/checkBox4" />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="CHECK"
        android:onClick="clicked"
        android:id="@+id/button" />
</LinearLayout>

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