在 AndroidManifest.xml 中设置 screenOrientation 不起作用

我有一个简单的 hello world Android 测试项目。在我的 AndroidManifest.xml 中，我已经设置

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

但是当我调试代码时，变量 isLandscape 应该是 False，但它却是 True

boolean isLandscape = getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE;

我知道我也可以通过代码设置活动方向，但由于某些原因我需要在xml中设置它。我该怎么做？

编辑：我的 AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.androidgames.mreater"
android:versionCode="1"
android:versionName="1.0" 
android:installLocation="preferExternal">

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="17" />

<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

<application
    android:icon="@drawable/ic_launcher"
    android:allowBackup="true"
    android:label="Mr. Eater" >
    <activity
        android:name="com.androidgames.mreater.MrEaterGame"
        android:label="Mr. Eater" 
        android:screenOrientation="portrait"
        android:configChanges="keyboard|keyboardHidden|orientation|screenSize">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

我实际的 onCreate 活动方法：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean isLandscape = getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE;

    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);

    int frameBufferWidth = isLandscape ? 480 : 320;
    int frameBufferHeight = isLandscape ? 320 : 480;
   Bitmap frameBuffer = Bitmap.createBitmap(frameBufferWidth,
            frameBufferHeight, Config.RGB_565);

    float scaleX = (float) frameBufferWidth
            / getWindowManager().getDefaultDisplay().getWidth();
    float scaleY = (float) frameBufferHeight
            / getWindowManager().getDefaultDisplay().getHeight();

    renderView = new AndroidFastRenderView(this, frameBuffer);
    graphics = new AndroidGraphics(getAssets(), frameBuffer);
    fileIO = new AndroidFileIO(getAssets());
    audio = new AndroidAudio(this);
    input = new AndroidInput(this, renderView, scaleX, scaleY);
    screen = this.getStartScreen();
   setContentView(renderView);

    PowerManager powerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
    wakeLock = powerManager.newWakeLock(PowerManager.FULL_WAKE_LOCK, "GLGame");
}

现在事情变得更奇怪了，isLandscape 变量是 True，但有时却是 False。它在某种程度上就像一个错误。

确保将其放入<activity>标签，而不是<application> tag.

它仅适用于<activity>标签，但如果你把它放在<application> tag.

http://developer.android.com/guide/topics/manifest/application-element.html http://developer.android.com/guide/topics/manifest/application-element.html

vs

http://developer.android.com/guide/topics/manifest/activity-element.html http://developer.android.com/guide/topics/manifest/activity-element.html

你需要把它放在每个Activity你定义在你的manifest.xml