a.java 文件源码

/**
 * Change the desired orientation of this activity.  If the activity
 * is currently in the foreground or otherwise impacting the screen
 * orientation, the screen will immediately be changed (possibly causing
 * the activity to be restarted). Otherwise, this will be used the next
 * time the activity is visible.
 *
 * @param requestedOrientation An orientation constant as used in
 * {@link ActivityInfo#screenOrientation ActivityInfo.screenOrientation}.
 */
public void setRequestedOrientation(@ActivityInfo.ScreenOrientation int requestedOrientation) {
    if (mParent == null) {
        try {
            ActivityManagerNative.getDefault().setRequestedOrientation(
                    mToken, requestedOrientation);
        } catch (RemoteException e) {
            // Empty
        }
    } else {
        mParent.setRequestedOrientation(requestedOrientation);
    }
}