Android checkbox 예제

1. Custom String

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

File : res/values/strings.xml

Markup

<?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

Markup

<?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>

Make CheckBox is checked by default
Put android:checked="true" inside checkbox element to make it checked bu default. In this case, “Android” option is checked by default.

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

Java

package com.mkyong.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 :

2. If “IPhone” is checked :

3. Checked “IPhone” and “Windows Mobile”, later, click on the “display” button :

Download Source Code

Download it – Android-Checkbox-Example.zip (15 KB)

출처 - https://www.mkyong.com/android/android-checkbox-example/