RadioGroup 和Radio的使用

这里用一个实例，介绍radio的基本使用 ：一个radioGroup中的两个radio，点击相应的，在textView中显示相应文字 

1 String.xml中显示

	  <string name="tr_radio_op1">大头娘娘</string>
	  <string name="tr_radio_op2">小头皇帝</string>
	  <string name="str_radio_question1">请问你是？</string> 

 2 布局中的使用

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
 
  <!--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>

 3  java的例子

  

import android.app.Activity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

/**
 * RadioGroup 的学习 
 */ 

public class RadioGroupActivity extends Activity {
	public TextView mTextView1;
	public RadioGroup mRadioGroup1;
	public RadioButton mRadio1, mRadio2;

	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.radiogroup);

		/* 取得 TextView、RadioGroup、RadioButton对象 */
		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来运行 */
		mRadioGroup1.setOnCheckedChangeListener(mChangeRadio);
	}

	private RadioGroup.OnCheckedChangeListener mChangeRadio = new RadioGroup.OnCheckedChangeListener() {
		@Override
		public void onCheckedChanged(RadioGroup group, int checkedId) {
			if (checkedId == mRadio1.getId()) {
				/* 把mRadio1的内容传到mTextView1 */
				mTextView1.setText(mRadio1.getText());
			} else if (checkedId == mRadio2.getId()) {
				/* 把mRadio2的内容传到mTextView1 */
				mTextView1.setText(mRadio2.getText());
			}
		}
	};

}