Android canvas draw rectangle

Question

how to draw empty rectangle with etc  borderWidth 3 and borderColor black and part within rectangle don t have content or color  Which function in Canvas to use  void drawRect float left  float top  float right  float bottom  Paint paint   void drawRect RectF rect  Paint paint   void drawRect Rect r  Paint paint    Thanks   I try this example  Paint myPaint   new Paint    myPaint setColor Color rgb 0  0  0    myPaint setStrokeWidth 10   c drawRect 100  100  200  200  myPaint     It draws rectangle and fill it with black color but I want just  frame  around like this image

User · Answer

Assuming that  part within rectangle don t have content color  means that you want different fills within the rectangle  you need to draw a rectangle within your rectangle then with stroke width 0 and the desired fill colour s      For example   DrawView java  import android content Context  import android graphics Canvas  import android graphics Color  import android graphics Paint  import android view View   public class DrawView extends View       Paint paint   new Paint         public DrawView Context context            super context                           Override     public void onDraw Canvas canvas            paint setColor Color BLACK           paint setStrokeWidth 3           canvas drawRect 30  30  80  80  paint           paint setStrokeWidth 0           paint setColor Color CYAN           canvas drawRect 33  60  77  77  paint            paint setColor Color YELLOW           canvas drawRect 33  33  77  60  paint                The activity to start it   StartDraw java  import android app Activity  import android graphics Color  import android os Bundle   public class StartDraw extends Activity       DrawView drawView        Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState            drawView   new DrawView this           drawView setBackgroundColor Color WHITE           setContentView drawView                 will turn out this way

User · Answer

The code is fine just setStyle of paint as STROKE  paint setStyle Paint Style STROKE

User · Answer

Try paint setStyle Paint Style STROKE

User · Answer

Don t know if this is too late  but the way I solved this was to draw four thin rectangles that together made up a one big border   Drawing the border with one rectangle seems to be undoable since they re all opaque  so you should draw each edge of the border separately

User · Answer

white background canvas drawRGB 255  255  255     border s properties paint setColor Color BLACK   paint setStrokeWidth 0           paint setStyle Paint Style STROKE            canvas drawRect 100  100  200  200  paint

User · Answer

Create a new class MyView  Which extends View  Override the onDraw Canvas canvas  method to draw rectangle on Canvas   import android content Context  import android graphics Canvas  import android graphics Color  import android graphics Paint  import android graphics Path  import android util AttributeSet  import android view View   public class MyView extends View     Paint paint   Path path    public MyView Context context      super context     init         public MyView Context context  AttributeSet attrs      super context  attrs     init         public MyView Context context  AttributeSet attrs  int defStyle      super context  attrs  defStyle     init         private void init      paint   new Paint      paint setColor Color BLUE     paint setStrokeWidth 10     paint setStyle Paint Style STROKE          Override  protected void onDraw Canvas canvas         TODO Auto-generated method stub   super onDraw canvas      canvas drawRect 30  50  200  350  paint     canvas drawRect 100  100  300  400  paint       drawRect left  top  right  bottom  paint           Then Move your Java activity to setContentView   using our custom View  MyView Call this way       public void onCreate Bundle savedInstanceState          super onCreate savedInstanceState         setContentView new MyView this          For more details you can visit here      http   developer android com reference android graphics Canvas html

User · Answer

paint setStrokeWidth 3    paint setColor BLACK     and either one of your drawRect should work

[android] Android canvas draw rectangle

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Examples related to android-canvas