关于android:screenOrientation="portrait" 横竖屏切换

当在AndroidManifest.xml文件中定义了android:screenOrientation="portrait"，就表示当我们切换横竖屏的时候，屏幕的内容始终以竖屏显示，而不会根据屏幕的方向来显示内容

AndroidManifest.xml文件

<? 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 >

main.xml文件

<? 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 >

TestActivity.java文件

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 " );
}

}
}

可以亲测一下，以验证我刚才说的结论

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