上面是一个TextView,下面有个RadioGroup,布局如下:
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"> <!--第一个TextView --> <TextView android:id="@+id/myTextView" android:layout_width="228px" android:layout_height="49px" android:text="@string/str_radio_question1" android:textSize="30sp" /> <!--建立一个RadioGroup --> <RadioGroup android:id="@+id/myRadioGroup" android:layout_width="137px" android:layout_height="216px" android:orientation="vertical"> <!--第一个RadioButton --> <RadioButton android:id="@+id/myRadioButton1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/tr_radio_op1" /> <!--第二个RadioButton --> <RadioButton android:id="@+id/myRadioButton2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/tr_radio_op2" /> </RadioGroup> </LinearLayout>
主控制程序 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) { // TODO Auto-generated method stub 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()); } } }; }
需要注意的就是RadioGroup的消息处理。
mRadioGroup1.setOnCheckedChangeListener(mChangeRadio);