如何以纵向打开相机？

Question

我的整个 android 相机应用程序都处于纵向模式，因此当我打开相机时，我需要它自动以纵向模式打开。当我现在打开相机时，预览是横向的。如何将相机预览设置为以纵向模式打开以使预览看起来正确？

Answer 1

您可以使用 Android Developer 文档中的此方法来旋转相机预览。

public final void setDisplayOrientation (int degrees)

Set the clockwise rotation of preview display in degrees. This affects the preview frames and the picture displayed after snapshot. This method is useful for portrait mode applications. Note that preview display of front-facing cameras is flipped horizontally before the rotation, that is, the image is reflected along the central vertical axis of the camera sensor. So the users can see themselves as looking into a mirror.

private void setCameraDisplayOrientation(Activity activity, int cameraId,
        android.hardware.Camera camera) {
    android.hardware.Camera.CameraInfo info = new android.hardware.Camera.CameraInfo();
    android.hardware.Camera.getCameraInfo(cameraId, info);
    int rotation = activity.getWindowManager().getDefaultDisplay()
            .getRotation();

    int degrees = 0;
    switch (rotation) {
    case Surface.ROTATION_0:
        degrees = 0;
        break;
    case Surface.ROTATION_90:
        degrees = 90;
        break;
    case Surface.ROTATION_180:
        degrees = 180;
        break;
    case Surface.ROTATION_270:
        degrees = 270;
        break;
    }

    int result = 0;

    if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
        result = (info.orientation + degrees) % 360;
        result = (360 - result) % 360; // compensate the mirror
    } else { // back-facing
        result = (info.orientation - degrees + 360) % 360;
    }
    camera.setDisplayOrientation(result);
}

希望对您有所帮助。

Answer 2

可能是因为您没有指定 screenRotation 尝试：

 android:screenOrientation="portrait"

或尝试以下操作：

在清单中添加方向属性

android:screenOrientation=["unspecified" | "behind" |
                                     "landscape" | "portrait" |
                                     "reverseLandscape" | "reversePortrait" |
                                     "sensorLandscape" | "sensorPortrait" |
                                     "userLandscape" | "userPortrait" |
                                     "sensor" | "fullSensor" | "nosensor" |
                                     "user" | "fullUser" | "locked"]
So in your case it will be

<activity android:name=".yourCameractivity"
      ....
      android:screenOrientation="portrait"/>

如何以纵向打开相机？

How to open camera with a portrait orientation?

java

android

orientation

android-camera