Android Checkbox Example

In Android, you can use “android.widget.CheckBox” class to render a checkbox.

In this tutorial, we show you how to create 3 checkboxes in XML file, and demonstrates the use of listener to check the checkbox state – checked or unchecked.

1. Custom String

Open “res/values/strings.xml” file, add some user-defined string.

File : res/values/strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, MyAndroidAppActivity!</string>
    <string name="app_name">MyAndroidApp</string>
    <string name="chk_ios">IPhone</string>
    <string name="chk_android">Android</string>
    <string name="chk_windows">Windows Mobile</string>
    <string name="btn_display">Display</string>
</resources>

2. CheckBox

Open “res/layout/main.xml” file, add 3 “CheckBox” and a button, inside the LinearLayout.

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/chkIos"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/chk_ios" />
 
    <CheckBox
        android:id="@+id/chkAndroid"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/chk_android"
        android:checked="true" />
 
    <CheckBox
        android:id="@+id/chkWindows"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/chk_windows" />
 
    <Button
        android:id="@+id/btnDisplay"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/btn_display" />
 
</LinearLayout>

3. Code Code

Attach listeners inside your activity “onCreate()” method, to monitor following events :

1. If checkbox id : “chkIos” is checked, display a floating box with message “Bro, try Android”.
2. If button is is clicked, display a floating box and display the checkbox states.

File : MyAndroidAppActivity.java

package com.abhi.android;
 
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 MyAndroidAppActivity extends Activity {
 
  private CheckBox chkIos, chkAndroid, chkWindows;
  private Button btnDisplay;
 
  @Override
  public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.main);
 
	addListenerOnChkIos();
	addListenerOnButton();
  }
 
  public void addListenerOnChkIos() {
 
	chkIos = (CheckBox) findViewById(R.id.chkIos);
 
	chkIos.setOnClickListener(new OnClickListener() {
 
	  @Override
	  public void onClick(View v) {
                //is chkIos checked?
		if (((CheckBox) v).isChecked()) {
			Toast.makeText(MyAndroidAppActivity.this,
		 	   "Bro, try Android :)", Toast.LENGTH_LONG).show();
		}
 
	  }
	});
 
  }
 
  public void addListenerOnButton() {
 
	chkIos = (CheckBox) findViewById(R.id.chkIos);
	chkAndroid = (CheckBox) findViewById(R.id.chkAndroid);
	chkWindows = (CheckBox) findViewById(R.id.chkWindows);
	btnDisplay = (Button) findViewById(R.id.btnDisplay);
 
	btnDisplay.setOnClickListener(new OnClickListener() {
 
          //Run when button is clicked
	  @Override
	  public void onClick(View v) {
 
		StringBuffer result = new StringBuffer();
		result.append("IPhone check : ").append(chkIos.isChecked());
		result.append("\nAndroid check : ").append(chkAndroid.isChecked());
		result.append("\nWindows Mobile check :").append(chkWindows.isChecked());
 
		Toast.makeText(MyAndroidAppActivity.this, result.toString(),
				Toast.LENGTH_LONG).show();
 
	  }
	});
 
  }
}

4. Demo

Run the application.

1. Result :

this is how you use the checkbox feature of android.

try this and explore. 

OraNgE.