安卓(Android) 怎么根据活动(Activity)的旋转设置相机(Camera)显示方向

2019年10月27日22:31:57安卓(Android) 怎么根据活动(Activity)的旋转设置相机(Camera)显示方向已关闭评论 324 1219字阅读4分3秒

1.简介

安卓(Android) 怎么根据活动(Activity)的旋转设置相机(Camera)显示方向?——请看下文。

2.示例代码

/**
 * 版权所有 编程十万个怎么办(www.tah1986.com)
 */


import android.annotation.SuppressLint;
import android.app.Activity;
import android.hardware.Camera;
import android.view.Surface;

public class Main {
    
     
    @SuppressLint("NewApi")
    public static void setCameraDisplayOrientation(Activity activity,
            int cameraId, android.hardware.Camera camera) {
        final int rotation = activity.getWindowManager()
                .getDefaultDisplay().getRotation();
        final int rotDeg = getCameraRotationForSurfaceRotation(rotation,
                camera, cameraId);
        if (rotDeg != 0) {
            camera.setDisplayOrientation(rotDeg);
        }
    }

    
    @SuppressLint("NewApi")
    public static int getCameraRotationForSurfaceRotation(
            int surfaceRotation, Camera camera, int cameraID) {
        android.hardware.Camera.CameraInfo info = new android.hardware.Camera.CameraInfo();
        android.hardware.Camera.getCameraInfo(cameraID, info);

        int degrees = 0;

        switch (surfaceRotation) {
        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;
        if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
            result = (info.orientation + degrees) % 360;
            result = (360 - result) % 360; 
        } else { 
            result = (info.orientation - degrees + 360) % 360;
        }
        return result;
    }
}

 
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