Comprehensive Application Example of RadioGroup in Android Programming

This article describes the usage of Android programming single option box RadioGroup. Share it with everyone for reference, as follows:

Today, we introduce the group event of RadioGroup. RadioGroup can limit each different RadioButton to the same Radio button group, and the buttons in the same RadioGroup group can only make a single choice (single choice question).

Firstly, we design a TextView Widget and a RadioGroup, and place two RadioButton inside the RadioGroup, defaulting to no selection. During the program's execution phase, use onCheckedChanged as the trigger event, allowing the User to select one button, displaying the selected content, and finally displaying the RadioButton's option text in the TextView.

Next, let's take a look at the effect diagram:

　

Below is the relevant code involved:

string.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
 <string name="hello">Hello World, RadioGroupDemo</string>
 <string name="app_name">RadioGroupDemo</string>
 <string name="tr_radio_op1"> Handsome man</string>
 <string name="tr_radio_op2">Beautiful girl</string>
 <string name="str_radio_question1">Please ask you are? </string>
</resources>

Main layout main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:Android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 >
 !--The first TextView -->
 <TextView
  android:id="@"+id/myTextView"
  android:layout_width="228px"
  android:layout_height="49px"
  android:text="@string/str_radio_question1"
  android:textSize="30sp"
 />
 !--Establish a RadioGroup -->
 <RadioGroup
  android:id="@"+id/myRadioGroup"
  android:layout_width="137px"
  android:layout_height="216px"
  android:orientation="vertical"
  >
  !--First RadioButton -->
  <RadioButton
   android:id="@"+id/myRadioButton1"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="@string/tr_radio_op1"
  />
  !--Second RadioButton -->
  <RadioButton
   android:id="@"+id/myRadioButton2"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="@string/tr_radio_op2"
  />
  </RadioGroup>
</LinearLayout>

Finally, it is the main control program RadioGroupDemo.Java:

package com.android.test;
import android.app.Activity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
public class RadioGroupDemo extends Activity
{
 public TextView mTextView1;
 public RadioGroup mRadioGroup1;
 public RadioButton mRadio1,mRadio2;
 public void onCreate(Bundle savedInstanceState)
 {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  /*Get TextView, RadioGroup, RadioButton objects*/
  mTextView1 = (TextView) findViewById(R.id.myTextView);
  mRadioGroup1 = (RadioGroup) findViewById(R.id.myRadioGroup);
  mRadio1 = (RadioButton) findViewById(R.id.myRadioButton1);
  mRadio2 = (RadioButton) findViewById(R.id.myRadioButton2);
  /*RadioGroup uses OnCheckedChangeListener to run*/
  mRadioGroup1.setOnCheckedChangeListener(mChangeRadio);
 }
 private RadioGroup.OnCheckedChangeListener mChangeRadio = new
      RadioGroup.OnCheckedChangeListener()
 {
  @Override
  public void onCheckedChanged(RadioGroup group, int checkedId)
  {
   // TODO Auto-generated method stub
   if(checkedId==mRadio1.getId())
   {
    /*Set mRadio1and pass the content to mTextView1*/
    mTextView1.setText(mRadio1.getText());
   }
   else if(checkedId==mRadio2.getId())
   {
    /*Set mRadio2and pass the content to mTextView1*/
    mTextView1.setText(mRadio2.getText());
   }
  }
 };
}

Run RadioGroupDemo.java, and you will get the above effect.

Readers who are interested in more content related to Android can check the special topics on this site: 'Summary of Android View View Techniques', 'Summary of Android Layout Techniques', 'Summary of Android Graphics and Image Processing Techniques', 'Android Development Tutorial for Beginners and Advanced', 'Summary of Android Debugging Techniques and Common Problem Solutions', 'Summary of Android Multimedia Operation Techniques (audio, video, recording, etc.)', 'Summary of Android Basic Component Usage', and 'Summary of Android Widget Usage'

I hope the content described in this article will be helpful to everyone in Android program design.

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