Android--切換屏幕方向

main.xml代碼：

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); // 設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("無法進行屏幕方向");
			} 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);
				}
			}

		}

	}
}

	
	
	
		android:configChanges="orientation|keyboard"
		     android:screenOrientation="portrait">