关于android:screenOrientation="portrait"

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.test"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="8" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".TestActivity"
                  android:label="@string/app_name"
                  android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
</manifest>

<?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"
    >
    <TextView  
        android:id="@+id/tv"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:text="横竖屏切换测试"
        />
    <EditText 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:id="@+id/et"
        />
</LinearLayout>

package com.test;

import android.app.Activity;
import android.content.res.Configuration;
import android.os.Bundle;
import android.widget.EditText;
import android.widget.TextView;

public class TestActivity extends Activity {
    EditText et;
    TextView tv;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        et = (EditText) findViewById(R.id.et);
        tv = (TextView) findViewById(R.id.tv);
        System.out.println("我是onCreate方法");
    }
    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        if(newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE){
            tv.setText("横屏");
        }else{
            tv.setText("竖屏");
        }
        
    }
}