android.widget.RadioButton 選項按鈕

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 大家好,我們今天這一節要介紹的是RadioGroup 的組事件.RadioGroup 可將各自不同的RadioButton ,設限於同一個Radio 按鈕組,同一個RadioGroup 組裡的按鈕,只能做出單一選擇(單選題).

首先,我們先設計一個TextView Widget ,以及一個RadioGroup ,並將該RadioGroup 內放置兩個RadioButton ,預設為都不選擇,在程式運行階段,利用onCheckedChanged 作為啟動事件裝置,讓User選擇其中一個按鈕,顯示被選擇的內容,最的將RadioButton 的選項文字顯示於TextView 當中.

 

下面我們看一下:

 

    

 

 

下面是涉及的相關代碼:

 

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">帥哥</string>  <string name="tr_radio_op2">美女</string>  <string name="str_radio_question1">請問你是？</string> </resources>

 

 

主布局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"  >  <!--第一個TextView -->  <TextView    android:id="@+id/myTextView"    android:layout_width="228px"    android:layout_height="49px"    android:text="@string/str_radio_question1"    android:textSize="30sp"      />     <!--建立一個RadioGroup -->  <RadioGroup    android:id="@+id/myRadioGroup"    android:layout_width="137px"    android:layout_height="216px"    android:orientation="vertical"    >    <!--第一個RadioButton -->    <RadioButton      android:id="@+id/myRadioButton1"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="@string/tr_radio_op1"    />    <!--第二個RadioButton -->    <RadioButton      android:id="@+id/myRadioButton2"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="@string/tr_radio_op2"    />    </RadioGroup>     </LinearLayout> 

 

最後是主控製程序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);          /*取得 TextView、RadioGroup、RadioButton對象*/    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用OnCheckedChangeListener來運行*/     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())      {         /*把mRadio1的內容傳到mTextView1*/        mTextView1.setText(mRadio1.getText());      }       else if(checkedId==mRadio2.getId())       {         /*把mRadio2的內容傳到mTextView1*/        mTextView1.setText(mRadio2.getText());       }           }   }; } 

 

運行RadioGroupDemo.java ,將得到以上效果...今天就到這~

android.widget.RadioButton 選項按鈕（轉）