Android控件(View)之TextView, Button, ImageButton, ImageView, CheckBox

android:checkedButton="@+id/rad3" android:orientation="horizontal"

android:gravity="center_vertical|center_horizontal">

< RadioButton android:text="rad1" android:id="@+id/rad1"

android:layout_width="wrap_content" android:layout_height="wrap_content">< /RadioButton>

< RadioButton android:text="rad2" android:id="@+id/rad2"

android:layout_width="wrap_content" android:layout_height="wrap_content">< /RadioButton>

< RadioButton android:text="rad3" android:id="@+id/rad3"

android:layout_width="wrap_content" android:layout_height="wrap_content">< /RadioButton>

< /RadioGroup>

< /LinearLayout>

_RadioButton.java

代码

package com.webabcd.view;

import android.app.Activity;

import android.os.Bundle;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.TextView;

public class _RadioButton extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

this.setContentView(R.layout.radiobutton);

setTitle("RadioButton");

RadioGroup group = (RadioGroup) this.findViewById(R.id.radioGroup);

// setOnCheckedChangeListener() - 响应单选框组内的选中项发生变化时的事件

group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

@Override

public void onCheckedChanged(RadioGroup group, int checkedId) {

TextView txt = (TextView) _RadioButton.this.findViewById(R.id.textView);

txt.setText(((RadioButton)findViewById(checkedId)).getText() + " 被选中");

}

});

}

}

7、AnalogClock 的 Demo