Android 未调用OnConfiguration Changed

为什么在emulator中切换方向（ctrl+F11）时未调用OnConfiguration Changed override方法

public class HelloSample extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);                
        setContentView(R.layout.main);
        System.out.println("Change in Orientation");
    }

}

在manifest.xml中

<application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".HelloSample"
                  android:label="@string/app_name"
                  android:configChanges="orientation|keyboardHidden"
                  >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

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使用真实设备，emulator不支持