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>

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