CheckBox Example

CheckBox ExampleCheckboxes allow the user to select one or more options from a set. Typically, you should present each checkbox option in a vertical list.

Now we will create an app which displays a question in a TextView and four answer options in four different Checkboxes. When user selects one of the options and clicks a button, the app tells if the answer is correct or not.

Step 1: Create a new project with name checkboxquiz and package name com.myexample.checkbox. Select File -> New -> New Project. Fill the forms and click “Finish” button.

Step 2: Open res -> layout -> xml (or) main.xml and add the code given below. Here we will create a TextView to display question, 4 CheckBoxes to display options, a Button, and another TextView to display result, in a LinearLayout.

<LinearLayout
	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"
	android:orientation="vertical">
	<LinearLayout
		android:id="@+id/linear1"
		android:layout_width="match_parent"
		android:layout_height="match_parent"
		android:padding="8dp"
		android:background="#FFFFFF"
		android:orientation="vertical">
		<TextView
			android:id="@+id/textview1"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:padding="8dp"
			android:text="Which is the nearest star to planet Earth\?"
			android:textSize="25sp"
			android:textColor="#E91E63"/>
		<CheckBox
			android:id="@+id/checkbox1"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:padding="8dp"
			android:text="Moon"
			android:textSize="18sp"
			android:textColor="#3F51B5"/>
		<CheckBox
			android:id="@+id/checkbox2"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:padding="8dp"
			android:text="Mars"
			android:textSize="18sp"
			android:textColor="#3F51B5"/>
		<CheckBox
			android:id="@+id/checkbox3"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:padding="8dp"
			android:text="Sun"
			android:textSize="18sp"
			android:textColor="#3F51B5"/>
		<CheckBox
			android:id="@+id/checkbox4"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:padding="8dp"
			android:text="Venus"
			android:textSize="18sp"
			android:textColor="#3F51B5"/>
		<Button
			android:id="@+id/button1"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:padding="8dp"
			android:background="#03A9F4"
			android:text="Submit"
			android:textSize="20sp"
			android:textColor="#FFFFFF"/>
		<TextView
			android:id="@+id/textview2"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:padding="8dp"
			android:textSize="18sp"
			android:textColor="#000000"/>
	</LinearLayout>
</LinearLayout>

Step 3: Open app -> java -> package and open MainActivity.java. Add following code in it. Here when a CheckBox is clicked, we will uncheck other 3 CheckBoxes, and when Button is clicked, we display if the CheckBox with correct answer is checked.

package com.myexample.checkbox;

import android.os.*;
import android.app.Activity;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.CheckBox;
import android.widget.Button;
import android.view.View;

public class MainActivity extends Activity {

	private TextView textview1;
	private CheckBox checkbox1;
	private CheckBox checkbox2;
	private CheckBox checkbox3;
	private CheckBox checkbox4;
	private Button button1;
	private TextView textview2;
	
	@Override
	protected void onCreate(Bundle _savedInstanceState) {
		super.onCreate(_savedInstanceState);
		setContentView(R.layout.main);
		
		// find the widgets from their ids on main.xml page
		textview1 = (TextView) findViewById(R.id.textview1);
		checkbox1 = (CheckBox) findViewById(R.id.checkbox1);
		checkbox2 = (CheckBox) findViewById(R.id.checkbox2);
		checkbox3 = (CheckBox) findViewById(R.id.checkbox3);
		checkbox4 = (CheckBox) findViewById(R.id.checkbox4);
		button1 = (Button) findViewById(R.id.button1);
		textview2 = (TextView) findViewById(R.id.textview2);

		checkbox1.setOnClickListener(new View.OnClickListener() {
				@Override
				public void onClick(View view) {
					// When checkbox1 is clicked
					// uncheck checkbox2, checkbox3, and checkbox4
					checkbox2.setChecked(false);
					checkbox3.setChecked(false);
					checkbox4.setChecked(false);
				}
			});

		checkbox2.setOnClickListener(new View.OnClickListener() {
				@Override
				public void onClick(View view) {
					// When checkbox2 is clicked
					// uncheck checkbox1, checkbox3, and checkbox4
					checkbox1.setChecked(false);
					checkbox3.setChecked(false);
					checkbox4.setChecked(false);
				}
			});

		checkbox3.setOnClickListener(new View.OnClickListener() {
				@Override
				public void onClick(View view) {
					// When checkbox3 is clicked
					// uncheck checkbox1, checkbox2, and checkbox4
					checkbox2.setChecked(false);
					checkbox1.setChecked(false);
					checkbox4.setChecked(false);
				}
			});

		checkbox4.setOnClickListener(new View.OnClickListener() {
				@Override
				public void onClick(View view) {
					// When checkbox4 is clicked
					// uncheck checkbox1, checkbox2, and checkbox3
					checkbox2.setChecked(false);
					checkbox3.setChecked(false);
					checkbox1.setChecked(false);
				}
			});

		button1.setOnClickListener(new View.OnClickListener() {
				@Override
				public void onClick(View view) {
					// When button is clicked
					// show if the checked checkbox represent correct answer
					if (checkbox3.isChecked()) {
						textview2.setText("Correct! Sun is the correct answer.");
					}
					else {
						textview2.setText("Sorry! Your answer is incorrect.");
					}
				}
			});
	}
	
}

Output:

Now run the app. You will see the app displays a question and four options in four different Checkboxes. When you select one of the options and click the button, the app displays whether you selected the correct answer.

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