如何正确设置Android相机方向?


89

我想根据Android中的设备方向设置相机方向,但似乎没有任何作用。我尝试旋转“ Surface”以及相机参数,但纵向模式下的相机预览总是颠倒过来。我需要将其顺时针旋转90度才能正确。这是我现在使用的代码,仅在横向模式下有效。

    SurfaceHolder.Callback surfaceCallback = new SurfaceHolder.Callback() {

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        camera.stopPreview();
        camera.release();
        camera = null;
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {          
        initCamera();           
    }

    private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
        final double ASPECT_TOLERANCE = 0.2;
        double targetRatio = (double) w / h;
        if (sizes == null)
            return null;

        Size optimalSize = null;
        double minDiff = Double.MAX_VALUE;

        int targetHeight = h;

        // Try to find an size match aspect ratio and size
        for (Size size : sizes) {
            Log.d(TAG, "Checking size " + size.width + "w " + size.height
                    + "h");
            double ratio = (double) size.width / size.height;
            if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE)
                continue;
            if (Math.abs(size.height - targetHeight) < minDiff) {
                optimalSize = size;
                minDiff = Math.abs(size.height - targetHeight);
            }
        }

        // Cannot find the one match the aspect ratio, ignore the
        // requirement
        if (optimalSize == null) {
            minDiff = Double.MAX_VALUE;
            for (Size size : sizes) {
                if (Math.abs(size.height - targetHeight) < minDiff) {
                    optimalSize = size;
                    minDiff = Math.abs(size.height - targetHeight);
                }
            }
        }
        return optimalSize;
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        Camera.Parameters parameters = camera.getParameters();

        List<Size> sizes = parameters.getSupportedPreviewSizes();
        Size optimalSize = getOptimalPreviewSize(sizes, width, height);         
        Log.d(TAG, "Surface size is " + width + "w " + height + "h");
        Log.d(TAG, "Optimal size is " + optimalSize.width + "w " + optimalSize.height + "h");           
        parameters.setPreviewSize(optimalSize.width, optimalSize.height);           
        // parameters.setPreviewSize(width, height);            
        camera.setParameters(parameters);
        camera.startPreview();
    }
};  

6
AFAIK至少在2.2及更早版本中,相机预览仅在横向中真正起作用。我推测这就是为什么进行摄像头预览的活动倾向于隐藏系统通知栏并且没有标题的原因……尽管显然是肖像,但我认为它们是“真正的”风景。
Reuben Scratton

Answers:


71

来自其他成员和我的问题:

相机旋转问题取决于不同的设备和某些版本。

1.6版:修复了轮换问题,对大多数设备都非常有用

if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT)
        {   
            p.set("orientation", "portrait");
            p.set("rotation",90);
        }
        if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE)
        {                               
            p.set("orientation", "landscape");          
            p.set("rotation", 90);
        }

2.1版:取决于设备类型,例如,不能解决XPeria X10的问题,但对X8和Mini来说是好的

Camera.Parameters parameters = camera.getParameters();
parameters.set("orientation", "portrait");
camera.setParameters(parameters);

2.2版:不适用于所有设备

camera.setDisplayOrientation(90);

http://code.google.com/p/android/issues/detail?id=1193#c42


3
这里的版本是什么意思?
苏莱曼

31

在Javadocs中setDisplayOrientation(int)(要求API级别9):

 public static 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;
     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);
 }

1
@Derzu类CameraInfo没有出台,直到API 9级,所以我张贴的方法需要API级别9
贾森·罗宾逊

2
result = (360 - result) % 360; // compensate the mirror应该删除,否则前置摄像头的图片将无法正确旋转
stevo.mit

@ stevo.mit您是否已在多个设备上对此进行了验证?我已经多次使用此代码进行旋转,并且没有遇到不正确的旋转。
杰森·罗宾逊

2
@ Jason Robinson我有一些api级别高于9的模型列表,但是此方法仍然无效。不知道它的硬件相关问题。设备列表rotation_issue_models = Arrays.asList(“ GT-S5360”,“ GT-S6802”,“ GT-S5830C”,“ GT-S5830I”,“ DROID2”,“ GLOBAL”,“ XT557”,“所需高清”,“ PC36100”,“ GT-I9000”,“ ADR6350”,“ Mi-One Plus”,“ SGH-T989”,“ GT-I9100”,“ GT-I9001”);
维克拉姆2014年

1
@AbdulMohsin查看developer.android.com/reference/android/hardware/…,尤其是CAMERA_FACING_BACK和CAMERA_FACING_FRONT。
2014年

25

该解决方案将适用于所有人版本的Android。您可以在Java中使用反射来使其适用于所有Android设备:

基本上,您应该创建一个反射包装来调用Android 2.2 setDisplayOrientation,而不是调用特定的方法。

方法:

    protected void setDisplayOrientation(Camera camera, int angle){
    Method downPolymorphic;
    try
    {
        downPolymorphic = camera.getClass().getMethod("setDisplayOrientation", new Class[] { int.class });
        if (downPolymorphic != null)
            downPolymorphic.invoke(camera, new Object[] { angle });
    }
    catch (Exception e1)
    {
    }
}

而不是使用camera.setDisplayOrientation(x)来使用setDisplayOrientation(camera,x)

    if (Integer.parseInt(Build.VERSION.SDK) >= 8)
        setDisplayOrientation(mCamera, 90);
    else
    {
        if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT)
        {
            p.set("orientation", "portrait");
            p.set("rotation", 90);
        }
        if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE)
        {
            p.set("orientation", "landscape");
            p.set("rotation", 90);
        }
    }   

1
else部分可在某些2.1设备上运行,但不能在ALL设备上运行(请参见上述maydenec的说明)。
Eric Chen

1
我认为p是典型的Camera.Parameters。尝试添加以下行:Camera.Parameters p = camera.getParameters();
Sehrish Khan 2012年

6

当我使用ZBar扫描选项卡时遇到了问题。相机方向问题。使用下面的代码,我能够解决问题。这不是完整的代码段,请仅从中获取帮助。

 public void surfaceChanged(SurfaceHolder holder, int format, int width,
                               int height) {
     if (isPreviewRunning) {
            mCamera.stopPreview();
        }

 setCameraDisplayOrientation(mCamera);

        previewCamera();

    }



 public void previewCamera() {

        try {
            // Hard code camera surface rotation 90 degs to match Activity view
            // in portrait
            mCamera.setPreviewDisplay(mHolder);
            mCamera.setPreviewCallback(previewCallback);
            mCamera.startPreview();
            mCamera.autoFocus(autoFocusCallback);
            isPreviewRunning = true;
        } catch (Exception e) {
            Log.d("DBG", "Error starting camera preview: " + e.getMessage());
        }


    }


public void setCameraDisplayOrientation(android.hardware.Camera camera) {
        Camera.Parameters parameters = camera.getParameters();

        android.hardware.Camera.CameraInfo camInfo =
                new android.hardware.Camera.CameraInfo();
        android.hardware.Camera.getCameraInfo(getBackFacingCameraId(), camInfo);


        Display display = ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
        int rotation = display.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;
        if (camInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
            result = (camInfo.orientation + degrees) % 360;
            result = (360 - result) % 360;  // compensate the mirror
        } else {  // back-facing
            result = (camInfo.orientation - degrees + 360) % 360;
        }
        camera.setDisplayOrientation(result);
    }




    private int getBackFacingCameraId() {
        int cameraId = -1;
        // Search for the front facing camera
        int numberOfCameras = Camera.getNumberOfCameras();
        for (int i = 0; i < numberOfCameras; i++) {
            Camera.CameraInfo info = new Camera.CameraInfo();
            Camera.getCameraInfo(i, info);
            if (info.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {

                cameraId = i;
                break;
            }
        }
        return cameraId;
    }

5

我终于使用Google的相机应用程序解决了这个问题。它通过使用传感器获取手机的方向,然后适当设置EXIF标签。相机发出的JPEG不会自动定位。

另外,相机预览仅在横向模式下正常工作。如果您需要将活动布局定向为纵向,则必须使用方向传感器中的值手动进行。


2
嘿,如何使用方向传感器获取相机方向?请分享您的代码...
Rishi 2012年


4
感谢您的帮助,但是我的问题是,当即时通讯以竖拍模式在Symsung手机上拍照时,照片在屏幕上旋转了90度。因此,我尝试获取相机的方向,因此将人像模式下的照片旋转了90度
Rishi 2012年

4

这个问题很久以前就已经解决了,但是在将所有部分组合在一起时遇到了一些困难,因此这是我的最终解决方案,希望对其他人有所帮助:

public void startPreview() {
        try {
            Log.i(TAG, "starting preview: " + started);

            // ....
            Camera.CameraInfo camInfo = new Camera.CameraInfo();
            Camera.getCameraInfo(cameraIndex, camInfo);
            int cameraRotationOffset = camInfo.orientation;
            // ...

            Camera.Parameters parameters = camera.getParameters();
            List<Camera.Size> previewSizes = parameters.getSupportedPreviewSizes();
            Camera.Size previewSize = null;
            float closestRatio = Float.MAX_VALUE;

            int targetPreviewWidth = isLandscape() ? getWidth() : getHeight();
            int targetPreviewHeight = isLandscape() ? getHeight() : getWidth();
            float targetRatio = targetPreviewWidth / (float) targetPreviewHeight;

            Log.v(TAG, "target size: " + targetPreviewWidth + " / " + targetPreviewHeight + " ratio:" + targetRatio);
            for (Camera.Size candidateSize : previewSizes) {
                float whRatio = candidateSize.width / (float) candidateSize.height;
                if (previewSize == null || Math.abs(targetRatio - whRatio) < Math.abs(targetRatio - closestRatio)) {
                    closestRatio = whRatio;
                    previewSize = candidateSize;
                }
            }

            int rotation = getWindowManager().getDefaultDisplay().getRotation();
            int degrees = 0;
            switch (rotation) {
            case Surface.ROTATION_0:
                degrees = 0;
                break; // Natural orientation
            case Surface.ROTATION_90:
                degrees = 90;
                break; // Landscape left
            case Surface.ROTATION_180:
                degrees = 180;
                break;// Upside down
            case Surface.ROTATION_270:
                degrees = 270;
                break;// Landscape right
            }
            int displayRotation;
            if (isFrontFacingCam) {
                displayRotation = (cameraRotationOffset + degrees) % 360;
                displayRotation = (360 - displayRotation) % 360; // compensate
                                                                    // the
                                                                    // mirror
            } else { // back-facing
                displayRotation = (cameraRotationOffset - degrees + 360) % 360;
            }

            Log.v(TAG, "rotation cam / phone = displayRotation: " + cameraRotationOffset + " / " + degrees + " = "
                    + displayRotation);

            this.camera.setDisplayOrientation(displayRotation);

            int rotate;
            if (isFrontFacingCam) {
                rotate = (360 + cameraRotationOffset + degrees) % 360;
            } else {
                rotate = (360 + cameraRotationOffset - degrees) % 360;
            }

            Log.v(TAG, "screenshot rotation: " + cameraRotationOffset + " / " + degrees + " = " + rotate);

            Log.v(TAG, "preview size: " + previewSize.width + " / " + previewSize.height);
            parameters.setPreviewSize(previewSize.width, previewSize.height);
            parameters.setRotation(rotate);
            camera.setParameters(parameters);
            camera.setPreviewDisplay(mHolder);
            camera.startPreview();

            Log.d(TAG, "preview started");

            started = true;
        } catch (IOException e) {
            Log.d(TAG, "Error setting camera preview: " + e.getMessage());
        }
    }

“我希望这会对他人有所帮助”,不会,不会。您的代码段脱离了上下文。例如,“ isFrontFacingCam”来自哪里?
seanpj 2014年

4
我认为这实际上是另一个主题,与最初的问题相比,这确实没有任何意义。您可以从android.hardware.Camera.CameraInfo.face == CameraInfo.CAMERA_FACING_FRONT中获取它。为此表示歉意。
Louis GRIGNON 2014年

4

看看这个解决方案

 public static 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;
        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);
    }

感谢您处理前置摄像头。这解决了我的问题
Louis CAD

欢迎您,@ LouisCAD很高兴看到我的解决方案解决了您的问题。
Mudassir Khan
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