Android CheckBox

In this tutorial, it shows you on how to create 3 checkboxes in XML file, and demonstrates the use of listener to check or uncheck the checkbox

How it works?

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

<?xml version="1.0" encoding="utf-8"?>

<string name="chkbscoe">BSCoE</string>

<string name="btndisplay">Display</string>

<string name="app_name">ESS CheckBox</string>

</resources>

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

<?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/chkBSIT"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/chkbsit" />

<CheckBox

android:id="@+id/chkBSCOE"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/chkbscoe" />

<CheckBox

android:id="@+id/chkITP"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/chkitp" />

<Button

android:id="@+id/btnDISPLAY"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/btndisplay" />

</LinearLayout>

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

If checkbox id : “chkbsit” is checked, display a floating box with message “Go Webhunters”.
If button is clicked, display a floating box and display the checkbox states.

package ess.checkbox.isourcecode;

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 ESSCheckBoxActivity extends Activity implements OnClickListener {

/** Called when the activity is first created. */

CheckBox cbsit, cbscoe, citp;

Button bdisplay;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

cbsit=(CheckBox)findViewById(R.id.chkBSIT);

cbscoe=(CheckBox)findViewById(R.id.chkBSCOE);

citp=(CheckBox)findViewById(R.id.chkITP);

bdisplay=(Button)findViewById(R.id.btnDISPLAY);

bdisplay.setOnClickListener(this);

cbsit.setOnClickListener(this);

}

public void onClick(View v) {

// TODO Auto-generated method stub

if(v.getId()==R.id.btnDISPLAY){

StringBuffer result = new StringBuffer();

result.append("BSIT check:").append(cbsit.isChecked() + "\n");

result.append("BSCOE check:").append(cbscoe.isChecked() + "\n");

result.append("ITP check:").append(citp.isChecked());

Toast.makeText(this, result.toString(), Toast.LENGTH_LONG).show();

}else if(v.getId()==R.id.chkBSIT){

if (cbsit.isChecked()){

Toast.makeText(this, "Go WebHunters!", Toast.LENGTH_LONG).show();

}

4. Run the application.

Programming Language: Java + XML
Programming IDE: Eclipse

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