mobile - Android Camera 2 preview size and devices aspect ratio

Question

I'm implementing Camera 2 API in my project. I'm using TextureView and these line of codes to set the camera fullscreen preview size:

StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
                mPreviewSize = map.getOutputSizes(SurfaceTexture.class)[0];

This seems to be the largest preview size that device support. I'm not sure if this size works with all devices and fit its device's aspect ratio without being stretched. Does anyone know?

Answer 1

If your Camera resolutions , texture view and your device's display dimensions are not same then you have to adjust the dimensions. For that you have to put your TextureView inside of FrameLayout. Below Code is applicable to all the devices with various Display resolutions.

Take your Display Dimetions if you are previewing in full screen.Take int DSI_height, int DSI_width global variable.

    DisplayMetrics displayMetrics = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
    DSI_height = displayMetrics.heightPixels;
    DSI_width = displayMetrics.widthPixels;

select your required resolutions from Camera2 API and assign to Size imageDimension, Take private Size imageDimension globally and use

setAspectRatioTextureView(imageDimension.getHeight(),imageDimension.getWidth());

and use below logic

private void setAspectRatioTextureView(int ResolutionWidth , int ResolutionHeight )
    {
        if(ResolutionWidth > ResolutionHeight){
            int newWidth = DSI_width;
            int newHeight = ((DSI_width * ResolutionWidth)/ResolutionHeight);
            updateTextureViewSize(newWidth,newHeight);

        }else {
            int newWidth = DSI_width;
            int newHeight = ((DSI_width * ResolutionHeight)/ResolutionWidth);
            updateTextureViewSize(newWidth,newHeight);
        }

    }

    private void updateTextureViewSize(int viewWidth, int viewHeight) {
        Log.d(TAG, "TextureView Width : " + viewWidth + " TextureView Height : " + viewHeight);
        textureView.setLayoutParams(new FrameLayout.LayoutParams(viewWidth, viewHeight));
    }