Button的使用(九):RadioGroup的OnCheckedChange事件

package com.example.androidtest;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.RadioGroup;
import android.widget.LinearLayout;
import android.view.Gravity;
import android.util.Log;

public class MainActivity extends Activity implements RadioGroup.OnCheckedChangeListener {

RadioGroup orientation;
RadioGroup gravity;

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

orientation = (RadioGroup)findViewById(R.id.orientation);
orientation.setOnCheckedChangeListener(this);
gravity = (RadioGroup)findViewById(R.id.gravity);
gravity.setOnCheckedChangeListener(this);
}

public void onCheckedChanged(RadioGroup group, int checkedId)
{
switch (checkedId) {
case R.id.horizontal:
orientation.setOrientation(LinearLayout.HORIZONTAL);
break;
case R.id.vertical:
orientation.setOrientation(LinearLayout.VERTICAL);
break;
case R.id.left:
gravity.setGravity(Gravity.LEFT);
break;
case R.id.center:
gravity.setGravity(Gravity.CENTER);
break;
case R.id.right:
gravity.setGravity(Gravity.RIGHT);
break;
}
}

}

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"
>
<RadioGroup android:id="@+id/orientation"
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5px">
<RadioButton
android:id="@+id/horizontal"
android:text="horizontal" />
<RadioButton
android:id="@+id/vertical"
android:text="vertical" />
</RadioGroup>
<RadioGroup android:id="@+id/gravity"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="5px">
<RadioButton
android:id="@+id/left"
android:text="left" />
<RadioButton
android:id="@+id/center"
android:text="center" />
<RadioButton
android:id="@+id/right"
android:text="right" />
</RadioGroup>
</LinearLayout>