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

（4）所有布局的尺寸用代码实现

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);
}