Setting the TextView font size on Java code

Part of the source code:

    /*** Set The default text size to a given unit and value. See {@link* Typedvalue} for the possible dimension units. *     * @paramunit the desired dimension unit. * @paramsize the desired size in the given units. * * @attr ref Android. R.styleable#textview_textsize*/     Public voidSettextsize (intUnitfloatsize) {Context C=GetContext ();        Resources R; if(c = =NULL) R=Resources.getsystem (); ElseR=c.getresources ();    Setrawtextsize (typedvalue.applydimension (unit, size, R.getdisplaymetrics ())); }    Private voidSetrawtextsize (floatsize) {        if(Size! =mtextpaint.gettextsize ())            {mtextpaint.settextsize (size); if(Mlayout! =NULL) {nulllayouts ();                Requestlayout ();            Invalidate (); }        }    }    /*** Converts an unpacked complex data value holding a dimension to it final floating * point value. The Parameters <var>unit</var> and <var>value</var> * is as in {@link#TYPE_DIMENSION}. *       * @paramUnit The unit to convert from. * @paramvalue The value to apply the unit to. * @paramMetrics current display metrics to use in the conversion--* Supplies display density and Scalin     G information. *      * @returnThe complex floating point value multiplied is the appropriate * metrics depending on its unit. */     Public Static floatApplydimension (intUnitfloatvalue, Displaymetrics metrics) {        Switch(unit) { Casecomplex_unit_px:returnvalue;  CaseComplex_unit_dip:returnValue *metrics.density;  Casecomplex_unit_sp:returnValue *metrics.scaleddensity;  Casecomplex_unit_pt:returnValue * metrics.xdpi * (1.0f/72);  Casecomplex_unit_in:returnValue *metrics.xdpi;  Casecomplex_unit_mm:returnValue * metrics.xdpi * (1.0f/25.4f); }        return0; }

1. By default:

<name= "text_size">20sp</dimen>

float size =

At this point, size gets a value of 20, but the font size set by TextView is: Setrawtextsize (metrics.scaleddensity);

2. Set the font size to 20:

float size =