Android tutorial - Android checkbox - android app development - android studio - android development tutorial



 checkbox-output

Checkbox

  • Alternatively referred to as a checkbox, selection box, or tick box, a check box is a square box where the user can click to say that they want or have a particular setting.
  • Check boxes are used when more than one option may need to be selected.
  • Checking would disable it.
  • The box would enable that option and unchecking it .
  • 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 Demo - android emulator - android tutorialnstrates the use of listener to check the checkbox state – checked or unchecked.

Custom String

  • Open “res/values/strings.xml” file, add some user-defined string.
android codes - android tutorial - android sdk
<?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>
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CheckBox

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

File : res/layout/main.xml

android codes - android tutorial - android sdk
<?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>
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 example

Code

  • Attach listeners inside your activity “onCreate()” method, to monitor following events :
  • If checkbox id : “chkIos” is checked, display a floating box with message “Wikitechy - Android Tutorial”.
  • If button is is clicked, display a floating box and display the checkbox states.

File : MyAndroidAppActivity.java

android codes - android tutorial - android sdk
package com.wikitechy.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,
		 	   "Wikitechy - Android Tutorial", 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();

	  }
	});

  }
}
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 sample_code

Demo - android emulator - android tutorial

  • Run the application.
  • Result :
 android
  • If “IPhone” is checked :
 android
  • Checked “IPhone” and “Windows Mobile”, later, click on the “display” button :
 windows

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