android - setRequestedOrientation，但仍根据传感器改变

Question

我想在处理屏幕方向方面模拟 youtube 视频观看行为。

用例:
p1。当用户按下最大化时 -> Activity 总是进入横向
p2。当用户按下最小化时 -> Activity 总是进入纵向
p3。当用户旋转设备时 -> 即使之前应用了 p1 或 p2，屏幕方向也应相应改变。

目前我使用:

 @Override
 public void onClick(View view) {
     if (getResources().getConfiguration().orientation == ORIENTATION_PORTRAIT) {
         setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);
     } else {
         setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT);
     }

然而，这会永久锁定方向，并且 p3 失败。

Answer 1

经过一段时间的尝试，我找到了正确的解决方案。首先 - 问题是 android 在调用 setRequestedOrientation 后锁定屏幕，你不能混合使用两者，唯一的办法就是手动完成所有操作。

方法如下:

class PlayerOrientationListener extends OrientationEventListener {
    PlayerOrientationListener() {
        super(VideoPlayerActivity.this);
    }

    @Override
    public void onOrientationChanged(int orientation) {
        int threshold = 5;
        if (Math.abs(orientation - 0) < threshold) orientation = 0;
        else if (Math.abs(orientation - 90) < threshold) orientation = 90;
        else if (Math.abs(orientation - 180) < threshold) orientation = 180;
        else if (Math.abs(orientation - 270) < threshold) orientation = 270;

        switch (orientation) {
            case 0:
                if (!orientationLandscapeLocked) {
                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
                    orientationPortraitLocked = false;
                }
                break;
            case 90:
                if (!orientationPortraitLocked) {
                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE);
                    orientationLandscapeLocked = false;
                }
                break;
            case 180:
                if (!orientationLandscapeLocked) {
                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT);
                    orientationPortraitLocked = false;
                }
                break;
            case 270:
                if (!orientationPortraitLocked) {
                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
                    orientationLandscapeLocked = false;
                }
                break;
        }
    }
}

和 Activity 代码:

View.OnClickListener onExpandClick = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (getResources().getConfiguration().orientation == ORIENTATION_PORTRAIT) {
                setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);
                orientationLandscapeLocked = true;
                orientationPortraitLocked = false;
            } else {
                setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT);
                orientationPortraitLocked = true;
                orientationLandscapeLocked = false;
            }
        }
    };
btnExpandVideo.setOnClickListener(onExpandClick);

orientationListener = new PlayerOrientationListener();
orientationListener.enable();