Checkbox Basics With Example

In This example creating checkbox and listener to listen checkbox click and show selected checkbox value.

Checkboxes allow the user to select one or more options from a set.

Create a CheckBox in your layout. Checkbox options allows the user to select multiple items, each checkbox is managed separately and you must register a click listener for each one.

Project Structure :

File : res/layout/main.xml

        <?xml version="1.0" encoding="utf-8"?>
        <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:orientation="vertical" >    
            
                    <CheckBox
                        android:id="@+id/android"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Android" />
                    
                    <CheckBox
                        android:id="@+id/java"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Java"
                        android:checked="true" />
                    
                    <CheckBox
                        android:id="@+id/opencv"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="OpenCV" />
                    
                    <Button
                        android:id="@+id/Clickhere"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Click here" />
        
        </LinearLayout>

File : src/CheckboxExample.java

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.Toast;

public class CheckboxExample extends Activity {

    private CheckBox android, java, opencv;
    private Button Clickhere;

    @Override
    public void onCreate(Bundle savedInstanceState) {
    
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        android   = (CheckBox) findViewById(R.id.android);
        java      = (CheckBox) findViewById(R.id.java);
        opencv    = (CheckBox) findViewById(R.id.opencv);
        Clickhere = (Button) findViewById(R.id.Clickhere);
        
        
        
        Clickhere.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                // Create string buffer to

                StringBuffer OUTPUT = new StringBuffer();
                OUTPUT.append("Android : ")
                        .append(android.isChecked());

                OUTPUT.append("\nJava : ").append(
                        java.isChecked());

               OUTPUT.append("\nOpenCV :").append(
                        opencv.isChecked());

                Toast.makeText(CheckboxExample.this, OUTPUT.toString(),
                        Toast.LENGTH_LONG).show();

            }
        });
        
    }
}

Conclusion :

Final words- Just download the project and run it using your emulator and if you have any doubts or suggestions, please place them in the comments.