單位換算api, ps to pt, dip to ps

public static int pixelsToPt(Context context, int sp) //context可傳入this.getApplicationContext()

{

        float scaledDensity = context.getResources().getDisplayMetrics().scaledDensity;

        return (int) (sp*scaledDensity);

}

public float convertDipToPixels(int dips)

{

        Resources r = getResources();

        return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dips, r.getDisplayMetrics());

}