WindowManager windowManager = (WindowManager)     getSystemService(Context.WINDOW_SERVICE);
Display d = windowManager.getDefaultDisplay();
mWidth = d.getWidth();mHeight = d.getHeight();
DisplayMetrics dm = getResources().getDisplayMetrics()
mScreenDensity = dm.density;

float scaleWidth = mWidth / uiWidth;
float scaleHeight = mHeight/ uiHeight;

public static int getWidthSize(int size) {
        return (int) (size * scaleWidth);
    }

    public static int getHightSize(int size) {
        return (int) (size * scaleHeight);
    }

    public static float getTextSize(int pxSize) {
        return (pxSize * scaleHeight) / mScreenDensity;
    }

    public static void setViewSize(int width, int height, View v) {
        int paramWidth = getWidthSize(width);
        int paramHeight = getHightSize(height);
        ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) v
                .getLayoutParams();
        if (width != INVALID) {
            params.width = paramWidth;
        }
        if (height != INVALID) {
            params.height = paramHeight;
        }
        v.setLayoutParams(params);
    }

    public static void setViewPadding(int left, int top, int right, int bottom,
            View v) {
        left = getWidthSize(left);
        top = getHightSize(top);
        right = getWidthSize(right);
        bottom = getWidthSize(bottom);
        v.setPadding(left, top, right, bottom);
    }

    public static void setViewMargin(int left, int top, int right, int bottom,
            View v) {
        int paramLeft = getWidthSize(left);
        int paramTop = getHightSize(top);
        int paramRight = getWidthSize(right);
        int paramBottom = getHightSize(bottom);
        ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) v
                .getLayoutParams();
        if (left != INVALID) {
            params.leftMargin = paramLeft;
        }
        if (right != INVALID) {
            params.rightMargin = paramRight;
        }
        if (top != INVALID) {
            params.topMargin = paramTop;
        }
        if (bottom != INVALID) {
            params.bottomMargin = paramBottom;
        }
        v.setLayoutParams(params);}

setViewSize(100, 100, mView);
    setViewMargin(20, 0, 0, 20, mView);
    setViewPadding(10, 10, 10, 10, mView);
    mTextView.setTextSize(getTextSize(30));