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 -> activity 总是进入横向
p2。当用户按下最小化 -> 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失败 p3。

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();

Answer 2

@Yuriy 的回答对我来说非常有用，这里是在 Kotlin 中进行了一些小的修改，以便它可以存在于一个单独的文件中：

class PlayerOrientationListener(val activity: Activity?) : OrientationEventListener(activity) {
    companion object {
        private const val ROT_THRESHOLD = 5

        private const val ROT_0 = 0
        private const val ROT_90 = 90
        private const val ROT_180 = 180
        private const val ROT_270 = 270
    }

    private var orientationLockedPortrait = false
    private var orientationLockedLandscape = false

    fun lockLandscape() {
        activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE
        orientationLockedLandscape = true
        orientationLockedPortrait = false
    }

    fun lockPortrait() {
        activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT
        orientationLockedPortrait = true
        orientationLockedLandscape = false
    }

    override fun onOrientationChanged(orientation: Int) {
        if (orientation == ORIENTATION_UNKNOWN) {
            return
        }

        val rotation: Int =
                when {
                    Math.abs(orientation - ROT_0) < ROT_THRESHOLD -> ROT_0
                    Math.abs(orientation - ROT_90) < ROT_THRESHOLD -> ROT_90
                    Math.abs(orientation - ROT_180) < ROT_THRESHOLD -> ROT_180
                    Math.abs(orientation - ROT_270) < ROT_THRESHOLD -> ROT_270
                    else -> ORIENTATION_UNKNOWN
                }

        when (rotation) {
            ROT_0 -> if (!orientationLockedLandscape) {
                activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
                orientationLockedPortrait = false
            }
            ROT_90 -> if (!orientationLockedPortrait) {
                activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE
                orientationLockedLandscape = false
            }
            ROT_180 -> if (!orientationLockedLandscape) {
                activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT
                orientationLockedPortrait = false
            }
            ROT_270 -> if (!orientationLockedPortrait) {
                activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE
                orientationLockedLandscape = false
            }
        }
    }
}

然后在你的片段中，像这样：

val orientationListener = PlayerOrientationListener(activity)
orientationListener.enable()

menuItemMaximize?.setOnMenuItemClickListener {
    orientationListener.lockLandscape()
    true
}

menuItemMinimize?.setOnMenuItemClickListener {
    orientationListener.lockPortrait()
    true
}

setRequestedOrientation，但仍根据传感器改变

setRequestedOrientation, but still change according to sensor

android

orientation

android-sensors

android-activity