Android Checkbox example

How to create checkboxes in Android and capture current state of the checkbox

In this example we will learn the following

• Create checkboxes using XML layout resource 
• Set the checkbox default value in the XML layout 
• Set the checkbox default value programmatically 
• Find the current state of the checkbox inside the program

Source for the Screen 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" >



    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:text="@string/hello"
        android:textSize="20sp" />

    <CheckBox
        android:id="@+id/selectAndroid"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Android" />


    <CheckBox
        android:id="@+id/selectIOS"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:checked="true"
        android:text="iOS" />


    <CheckBox
        android:id="@+id/selectWindows"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Windows" />

    <CheckBox
        android:id="@+id/selectRIM"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="RIM" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:text="Click here to see Results" />


    <TextView
        android:id="@+id/responseText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:text=""
        android:textAppearance="?android:attr/textAppearanceMedium" />

</LinearLayout>

Source for the Activity - AndroidCheckBoxesActivity.java

package com.as400samplecode;

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.TextView;

public class AndroidCheckBoxesActivity extends Activity {

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

  CheckBox android = (CheckBox) findViewById(R.id.selectAndroid);
  android.setChecked(true);
  checkButtonClick();

 }

 private void checkButtonClick() {


  Button myButton = (Button) findViewById(R.id.button1);
  myButton.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {

   CheckBox android = (CheckBox) findViewById(R.id.selectAndroid);
   CheckBox iOS = (CheckBox) findViewById(R.id.selectIOS);
   CheckBox windows = (CheckBox) findViewById(R.id.selectWindows);
   CheckBox rimOS = (CheckBox) findViewById(R.id.selectRIM);

   StringBuffer responseText = new StringBuffer();
   responseText.append("The following were selected...\n");
   responseText.append("Android : ")
    .append(android.isChecked()).append("\n");
   responseText.append("iOS : ")
    .append(iOS.isChecked()).append("\n");
   responseText.append("Windows : ")
    .append(windows.isChecked()).append("\n");
   responseText.append("RIM : ")
    .append(rimOS.isChecked()).append("\n");

   TextView myTextView = (TextView) findViewById(R.id.responseText);
   myTextView.setText(responseText);

   }
  });

 }

}