Android--切换屏幕方向

main.xml代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/mybtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="改变屏幕方向（当前为竖屏显示）" />

    <ImageView
        android:id="@+id/myview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/aa"/>

</LinearLayout>

.java代码如下：

package org.lxh.demo;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnFocusChangeListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;

public class Hello extends Activity {
	private Button change = null;
	private ImageView img = null;

	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState); // 生命周期方法
		super.setContentView(R.layout.main); // 设置要使用的布局管理器

		this.change = (Button) super.findViewById(R.id.mybtn);
		this.img = (ImageView) super.findViewById(R.id.myview);
		this.change.setOnClickListener(new OnClickListenerImpl());

	}

	private class OnClickListenerImpl implements OnClickListener {

		public void onClick(View arg0) {
			if (Hello.this.getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED) {
				Hello.this.change.setText("无法进行屏幕方向");
			} else {
				if (Hello.this.getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) {
					Hello.this
							.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
				} else if (Hello.this.getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) {
					Hello.this
							.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
				}
			}

		}

	}
}

需要配置权限：

<?xml version="1.0" encoding="utf-8"?>
<manifest
	xmlns:android="http://schemas.android.com/apk/res/android"
	package="org.lxh.demo"
	android:versionCode="1"
	android:versionName="1.0">
	<uses-sdk android:minSdkVersion="10" />
<strong>	<span style="color:#ff0000;"><uses-permission android:name="android.permission.CHANGE_CONFIGURATION"/></span></strong>
	<application
		android:icon="@drawable/icon"
		android:label="@string/app_name">
		<activity
			android:name=".Hello"
			android:label="@string/app_name"
			<strong><span style="color:#ff0000;">android:configChanges="orientation|keyboard"
		     android:screenOrientation="portrait"</span></strong>>
			<intent-filter>
				<action android:name="android.intent.action.MAIN" />
				<category android:name="android.intent.category.LAUNCHER" />
			</intent-filter>
		</activity>
	</application>
</manifest>