Android activity限制横屏

android 在某些情况需要限制activity的横竖屏，具体可以在manifest文件中配置

见下面红色部分，如果是限制为横屏配置为landscape

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

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.mobi.location.MainActivity"
            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>
        <service android:name=".QueryService" />
    </application>

</manifest>