Checkboxes In Android

Introduction

This article explains Checkboxes in Android. Android Studio is used to create the sample.

CheckBox

A CheckBox is a type of two-state button that can either be checked or unchecked.

In this article I used three CheckBoxes that, when clicked, display a toast that contains the id of that checkbox. If you check the first checkBox then it displays checkbox1 and if you check the second CheckBox then the toast displays checkbox2. I have also used a button so when clicking the button the state of the checkboxes display on the screen that shows which TextBox is selected. If one TextBox is selected then it shows checkbox1:true and another with false. If all the checkboxes are selected then it shows checkbox1:true, checkbox2:true, checkbox3:true.

Step 1

Create a project like this:



Step 2

Create an XML file and the following.

In this I used three checkboxes and a button that show the state of all the checkboxes on a click.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    android:paddingBottom="@dimen/activity_vertical_margin"

    tools:context=".MainActivity"

    android:background="#83a697">

 

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Check Box Example"

        android:layout_centerHorizontal="true"

        android:textStyle="bold"

        android:textColor="#00ffff"

        android:textSize="30dp" />

 

 

    <CheckBox

        android:id="@+id/checkbox1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginTop="70dp"

        android:text="Check1"

        android:textStyle="bold"

        android:textColor="#00ffff" />

 

 

    <CheckBox

        android:id="@+id/checkbox2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginTop="140dp"

        android:text="Check2"

        android:textStyle="bold"

        android:textColor="#00ffff" />

 

    <CheckBox

 

        android:id="@+id/checkbox3"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginTop="210dp"

        android:text="Check3"

        android:textStyle="bold"

        android:textColor="#00ffff" />

 

    <Button

        android:layout_width="wrap_content"

        android:id="@+id/buttonDelete"

        android:layout_height="wrap_content"

        android:layout_marginTop="300dp"

        android:layout_centerHorizontal="true"

        android:textColor="#00ffff"

        android:text="Show Message" />

 

</RelativeLayout>

 

Step 3

 

Create a Java class file and write the following.
 

First I created the layout, the id of the checkboxes and button. Now set checkbox1 on its clickListener() and oncheck get the state of the checkbox.  I also used the button to show the state of the checkboxes.

package com.checkboxexample;

 

import android.os.Bundle;

import android.app.Activity;

import android.view.Gravity;

import android.view.Menu;

import android.view.View;

import android.widget.Button;

import android.widget.CheckBox;

import android.widget.Toast;

 

public class MainActivity extends Activity {

 

    CheckBox checkBox1, checkBox2, checkBox3;

    Button buttonDelete;

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

 

        buttonDelete = (Button) findViewById(R.id.buttonDelete);

        checkBox1 = (CheckBox) findViewById(R.id.checkbox1);

        checkBox2 = (CheckBox) findViewById(R.id.checkbox2);

        checkBox3 = (CheckBox) findViewById(R.id.checkbox3);

 

        checkBox1.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

 

                if (checkBox1.isChecked()) {

                    checkBox1.getText().toString();

                    Toast.makeText(getApplicationContext(), checkBox1.getText().toString(), Toast.LENGTH_LONG).show();

                }

            }

        });

        checkBox2.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                checkBox2.getText().toString();

                Toast.makeText(getApplicationContext(), checkBox2.getText().toString(), Toast.LENGTH_LONG).show();

 

            }

        });

 

        checkBox3.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                checkBox3.getText().toString();

                Toast.makeText(getApplicationContext(), checkBox3.getText().toString(), Toast.LENGTH_LONG).show();

 

            }

        });

        buttonDelete.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                StringBuffer buffer = new StringBuffer();

                buffer.append("checkBox1 :").append(checkBox1.isChecked());

                buffer.append("\ncheckBox2 :").append(checkBox2.isChecked());

                buffer.append("\ncheckBox3 :").append(checkBox3.isChecked());

 

                Toast toast=new Toast(getApplicationContext());

           toast.makeText(getApplicationContext(),buffer.toString(),Toast.LENGTH_LONG).show();

            toast.setGravity(Gravity.CENTER_VERTICAL,0,30);

            }

        });

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }

 

}

Step 4

Output image when no checkbox is checked:


 

 Step 5

When one checkbox ic shecked:

 

 Step 6

When two checkboxes are checked: