问Android摄像头预览尺寸

EN

try {
            c = ((Class<? extends Controllo>) getIntent().getExtras().get("ctrl")).newInstance();
        } catch (Exception e) {
            Log.w("Error", e.toString());
            throw new RuntimeException(e.getMessage());
        }


        autoFocusHandler = new Handler();
        mCamera = getCameraInstance();

        Display display = getWindowManager().getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);

        FrameLayout preview = (FrameLayout)findViewById(com.x720.qrscanner.R.id.cameraPreview);

        Camera.Parameters parameters = mCamera.getParameters();
        Boolean trovatoParam = false;
        int minValWidth = 0;
        int minValHeight = 0;
        for (Camera.Size previewSize: mCamera.getParameters().getSupportedPreviewSizes())
        {
            Log.e("SIZE", previewSize.width+" - " +previewSize.height);
            Log.e("SCHERMO", size.y+" - "+size.x);
            if(previewSize.width > minValWidth && previewSize.height > minValHeight && previewSize.width <= size.y && previewSize.height <= size.x) {
                parameters.setPreviewSize(previewSize.width, previewSize.height);
                Log.e("-------------SELEZIONO", previewSize.width+"");
                trovatoParam = true;
                minValWidth = previewSize.width;
                minValHeight = previewSize.height;
            }
        }

        if(trovatoParam == true)
            mCamera.setParameters(parameters);


        /* Instance barcode scanner */
        scanner = new ImageScanner();
        scanner.setConfig(0, Config.X_DENSITY, 3);
        scanner.setConfig(0, Config.Y_DENSITY, 3);

        scanner.setConfig(0, Config.ENABLE, 0);
        // only enable QRCODE
        scanner.setConfig(Symbol.QRCODE, Config.ENABLE, 1);

        mPreview = new CameraPreview(this, mCamera, previewCb, autoFocusCB);

        preview.addView(mPreview);

public static Camera getCameraInstance(){
    Camera c = null;
    try {
        c = Camera.open();
    } catch (Exception e){
    }
    return c;
}