Launcher.java 文件源码

@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
public void lockScreenOrientation() {
    if (mRotationEnabled) {
        if (Utilities.ATLEAST_JB_MR2) {
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LOCKED);
        } else {
            setRequestedOrientation(mapConfigurationOriActivityInfoOri(getResources()
                    .getConfiguration().orientation));
        }
    }
}