CODEWITHSUNDEEP
androidcamera
adrian
adrian

Reputation: 4594

problem with camera preview in android

I have the following problem:I have an app where I'm using the camera of the android device. I have built my own camera.The BIG problem is that when the preview starts all the image looks resized.Every object looks longer, larger...

in surfaceChanged() method I've done this:

List<Size> previews = p.getSupportedPreviewSizes();

I looped this list previews but I haven't found a better size for my preview. The list previews has the size equal to 7 but nne of this items make my image look better!!

Here is how my method looks like:

 public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
            Log.e(TAG, "surfaceChanged");
            if (mPreviewRunning) {
                mCamera.stopPreview();
            }

            Camera.Parameters p = mCamera.getParameters();
            List<Size> sizes = p.getSupportedPictureSizes();
            List<Size> previews = p.getSupportedPreviewSizes();

            Size preview = previews.get(3);

    // the size of preview is 7 and looped each item....

         p.setPreviewSize(preview.width,preview.height);

         int f=p.getJpegQuality(); 
         Size   size = sizes.get(3);
         p.setJpegQuality(f);
         p.setPictureSize(size.width,size.height);

           mCamera.setParameters(p);
            try {
                mCamera.setPreviewDisplay(holder);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            mCamera.startPreview();
            mPreviewRunning = true;
        }

Anyone any idea?

Upvotes: 3

Views: 4975

Answers (2)

bluefalcon
bluefalcon

Reputation: 4245

You need to maintain your aspect ratio.

Try setting your preview size to 640x480 if your device supports it. This will maintain an aspect ratio of 4:3.

If your dev doesn't support 640x480 try setting it to a different resolution which maintains an aspect ratio of 4:3.

You can set the preview size on the camera like this -

 mCameraDevPara.setPreviewSize(PREVIEW_WIDTH, PREVIEW_HEIGHT);
 mCameraDev.setParameters(mCameraDevPara);

Only after you set the preview size you can call the API mCameraDev.setPreviewDisplay(mSurfaceHolder); and mCameraDev.startPreview();

Upvotes: 0

Michael
Michael

Reputation: 54725

Take a look at the PreviewFrameLayout class from the default Camera app. It's used to display SurfaceView using the aspect ratio it must have.

Upvotes: 1

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