如何在运行时锁定方向

Question

有没有办法在运行时锁定方向？例如,如果用户当前处于横向状态并切换菜单选项,我想允许用户将屏幕锁定为横向.

Answer 1

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

在某个活动上调用,会将其锁定为横向.查找ActivityInfo类中的其他标志.您可以将其锁定为纵向或使其传感器/滑块驱动.

更多信息:http://www.devx.com/wireless/Article/40792

Answer 2

注意getConfiguration返回和setRequestedOrientation想要的区别 - 它们都是int,但它们来自不同的常量定义.

以下是如何锁定当前方向,同时允许180度翻转

int currentOrientation = getResources().getConfiguration().orientation;
if (currentOrientation == Configuration.ORIENTATION_LANDSCAPE) {
   setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);
}
else {
   setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT);
}

Answer 3

这适用于具有反向纵向和反向横向的设备.

锁定方向:

    int orientation = getActivity().getRequestedOrientation();
    int rotation = ((WindowManager) getActivity().getSystemService(
            Context.WINDOW_SERVICE)).getDefaultDisplay().getRotation();
    switch (rotation) {
    case Surface.ROTATION_0:
        orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
        break;
    case Surface.ROTATION_90:
        orientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
        break;
    case Surface.ROTATION_180:
        orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT;
        break;
    default:
        orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
        break;
    }

    getActivity().setRequestedOrientation(orientation);

解锁方向:

   getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);

Answer 4

我好像有类似的情况.我想支持任何方向,但我需要在工作流程中的某个点之后保持当前方向.我的解决方案是:

在进入受保护的工作流程时:

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_NOSENSOR);

退出受保护的工作流程时:

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);

Answer 5

替代@pstoppani回答支持平板电脑(与@pstoppani答案一样,这只适用于设备> 2.2) -
测试Samsung Galaxy SIII和Samsung Galaxy Tab 10.1

public static void lockOrientation(Activity activity) {
    Display display = ((WindowManager) activity.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
    int rotation = display.getRotation();
    int tempOrientation = activity.getResources().getConfiguration().orientation;
    int orientation = 0;
    switch(tempOrientation)
    {
    case Configuration.ORIENTATION_LANDSCAPE:
        if(rotation == Surface.ROTATION_0 || rotation == Surface.ROTATION_90)
            orientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
        else
            orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
        break;
    case Configuration.ORIENTATION_PORTRAIT:
        if(rotation == Surface.ROTATION_0 || rotation == Surface.ROTATION_270)
            orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
        else
            orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT;
    }
    activity.setRequestedOrientation(orientation);
}

Answer 6

这是我的代码,您可以使用其中一种方法锁定屏幕,一旦完成任务,使用unlockOrientation解锁它:

/** Static methods related to device orientation. */
public class OrientationUtils {
    private OrientationUtils() {}

    /** Locks the device window in landscape mode. */
    public static void lockOrientationLandscape(Activity activity) {
        activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
    }

    /** Locks the device window in portrait mode. */
    public static void lockOrientationPortrait(Activity activity) {
    activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    }

    /** Locks the device window in actual screen mode. */
    public static void lockOrientation(Activity activity) {
        final int orientation = activity.getResources().getConfiguration().orientation;
        final int rotation = ((WindowManager) activity.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getRotation();

        // Copied from Android docs, since we don't have these values in Froyo 2.2
        int SCREEN_ORIENTATION_REVERSE_LANDSCAPE = 8;
        int SCREEN_ORIENTATION_REVERSE_PORTRAIT = 9;

        // Build.VERSION.SDK_INT <= Build.VERSION_CODES.FROYO
        if (!BuildVersionUtils.hasGingerbread()) {
            SCREEN_ORIENTATION_REVERSE_LANDSCAPE = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
            SCREEN_ORIENTATION_REVERSE_PORTRAIT = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
        }

        if (rotation == Surface.ROTATION_0 || rotation == Surface.ROTATION_90){
            if (orientation == Configuration.ORIENTATION_PORTRAIT){
                activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
            }
            else if (orientation == Configuration.ORIENTATION_LANDSCAPE){
                activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
            }
        }
        else if (rotation == Surface.ROTATION_180 || rotation == Surface.ROTATION_270) 
        {
            if (orientation == Configuration.ORIENTATION_PORTRAIT){
                activity.setRequestedOrientation(SCREEN_ORIENTATION_REVERSE_PORTRAIT);
            }
            else if (orientation == Configuration.ORIENTATION_LANDSCAPE){
                activity.setRequestedOrientation(SCREEN_ORIENTATION_REVERSE_LANDSCAPE);
            }
        }
    }

    /** Unlocks the device window in user defined screen mode. */
    public static void unlockOrientation(Activity activity) {
        activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_USER);
    }

}