从Android相机旋转图片

Question

I'm setting rotation for camera:

stopPreview();
Camera.Parameters p = mCamera.getParameters();
p.setRotation(90);
mCamera.setParameters(p);
startPreview();

Photo is taken when device is in horizontal orientation. I need photo rotated to vertical orientation. But when I'm saving jpeg it is never rotated, it's always horizontal.

protected void onJpegPicture(byte[] data, int width, int height) {
    saveJpeg(data, file);
}

Am I missing something? I don't think I should manually rotate picture after taking it. I think camera should be able to do this for me.

setRotation parameter doesn't matter. I tried all possible values (0, 90, 180, 270).

Answer 1

The code snippet you have should work, assuming you call setParameters() before calling takePicture(). You could try setting the parameters right before your takePicture call, instead of before starting preview, but that should not matter.

Note that you probably don't want to use 90 here, since the orientation of the picture is determined relative to the orientation of the sensor, not to your current UI orientation. And whether the sensor is aligned with portrait or landscape depends on your device - you can check this with CameraInfo.orientation . Nevertheless, you should see an effect if you've tried all the rotation values.

Which devices are you seeing this behavior on? Also, how are you viewing the final image? Some image viewers still don't interpret the JPEG rotation field correctly, though any on-device gallery app really should (especially if it's the default application).

Answer 2

Try rotating both camera and it's preview. ie

//rotate preview
camera.setDisplayOrientation(90);
//rotate camera
Camera.Parameters p = camera.getParameters();
p.setRotation(90);
camera.setParameters(p);

Tested on several HTC devices and it works.

Answer 3

Use this method by passing to it the Image itself and the rotation degree that is 90 in your case

public static Image rotate(Image img, double angle){
    double sin = Math.abs(Math.sin(Math.toRadians(angle))), cos = Math.abs(Math.cos(Math.toRadians(angle)));
    int w = img.getWidth(null), h = img.getHeight(null);
    int neww = (int) Math.floor(w * cos + h * sin), newh = (int) Math.floor(h
        * cos + w * sin);
    BufferedImage bimg = toBufferedImage(getEmptyImage(neww, newh));
    Graphics2D g = bimg.createGraphics();
    g.translate((neww - w) / 2, (newh - h) / 2);
    g.rotate(Math.toRadians(angle), w / 2, h / 2);
    g.drawRenderedImage(toBufferedImage(img), null);
    g.dispose();
    return toImage(bimg);
}