Android Canvas drawText

Question

I have a view  I m drawing with the Canvas object in the onDraw Canvas canvas  method  My code is   Paint paint   new Paint    paint setColor Color WHITE   paint setStyle Style FILL   canvas drawPaint paint    paint setColor android R color black   paint setTextSize 20   canvas drawText  Some Text   10  25  paint     The problem is the text doesn t show through the background  what am I doing wrong  If I remove the canvas drawPaint paint  and paint setColor android R color black  you can see the text on the screen

User · Accepted Answer

Worked this out  turns out that android R color black is not the same as Color BLACK  Changed the code to   Paint paint   new Paint     paint setColor Color WHITE    paint setStyle Style FILL    canvas drawPaint paint     paint setColor Color BLACK    paint setTextSize 20    canvas drawText  Some Text   10  25  paint      and it all works fine now

User · Answer

It should be noted that the documentation recommends using a Layout rather than Canvas drawText directly  My full answer about using a StaticLayout is here  but I will provide a summary below   String text    This is some text     TextPaint textPaint   new TextPaint    textPaint setAntiAlias true   textPaint setTextSize 16   getResources   getDisplayMetrics   density   textPaint setColor 0xFF000000    int width    int  textPaint measureText text   StaticLayout staticLayout   new StaticLayout text  textPaint   int  width  Layout Alignment ALIGN NORMAL  1 0f  0  false   staticLayout draw canvas     Here is a fuller example in the context of a custom view     public class MyView extends View        String mText    This is some text        TextPaint mTextPaint      StaticLayout mStaticLayout          use this constructor if creating MyView programmatically     public MyView Context context            super context           initLabelView                  this constructor is used when created from xml     public MyView Context context  AttributeSet attrs            super context  attrs           initLabelView               private void initLabelView             mTextPaint   new TextPaint            mTextPaint setAntiAlias true           mTextPaint setTextSize 16   getResources   getDisplayMetrics   density           mTextPaint setColor 0xFF000000               default to a single line of text         int width    int  mTextPaint measureText mText           mStaticLayout   new StaticLayout mText  mTextPaint   int  width  Layout Alignment ALIGN NORMAL  1 0f  0  false               New API alternate                       StaticLayout Builder builder   StaticLayout Builder obtain mText  0  mText length    mTextPaint  width                     setAlignment Layout Alignment ALIGN NORMAL                     setLineSpacing 1  0     multiplier  add                    setIncludePad false              mStaticLayout   builder build                Override     protected void onMeasure int widthMeasureSpec  int heightMeasureSpec               Tell the parent layout how big this view would like to be            but still respect any requirements  measure specs  that are passed down              determine the width         int width          int widthMode   MeasureSpec getMode widthMeasureSpec           int widthRequirement   MeasureSpec getSize widthMeasureSpec           if  widthMode    MeasureSpec EXACTLY                width   widthRequirement            else               width   mStaticLayout getWidth     getPaddingLeft     getPaddingRight                if  widthMode    MeasureSpec AT MOST                    if  width  gt  widthRequirement                        width   widthRequirement                         too long for a single line so relayout as multiline                     mStaticLayout   new StaticLayout mText  mTextPaint  width  Layout Alignment ALIGN NORMAL  1 0f  0  false                                                         determine the height         int height          int heightMode   MeasureSpec getMode heightMeasureSpec           int heightRequirement   MeasureSpec getSize heightMeasureSpec           if  heightMode    MeasureSpec EXACTLY                height   heightRequirement            else               height   mStaticLayout getHeight     getPaddingTop     getPaddingBottom                if  heightMode    MeasureSpec AT MOST                    height   Math min height  heightRequirement                                       Required call  set width and height         setMeasuredDimension width  height               Override     protected void onDraw Canvas canvas            super onDraw canvas              do as little as possible inside onDraw to improve performance             draw the text on the canvas after adjusting for padding         canvas save            canvas translate getPaddingLeft    getPaddingTop             mStaticLayout draw canvas           canvas restore

[android] Android Canvas.drawText

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