Android uses OnDraw to implement an example of drawing operations in view

The following is an introduction to Android through the OnDraw implementation of the drawing operation in the view of the sample code for detailed analysis, the need for friends can come to refer to the next

The Android drawing operation implements the drawing in the OnDraw function by inheriting the view implementation.
The following is a simple example:

Copy Code code as follows:

public class Androidtest extends activity {


/** called when the "activity is" is a. */


@Override


public void OnCreate (Bundle savedinstancestate) {


super.oncreate (savedinstancestate);





myview mv = new MyView (this);


Setcontentview (MV);


    }





public class MyView extends View {


MyView (Context context) {


super (context);


     }





@Override


protected void OnDraw (Canvas Canvas) {


//TODO auto-generated method stub


Super.ondraw (canvas);





//First define a paint


Paint Paint = new Paint ();


//Draw rectangular area-filled rectangle


//Set color


Paint.setcolor (Color.Blue);


//Set style-fill


Paint.setstyle (Style.fill);


//Draw a rectangle


Canvas.drawrect (New Rect (0, 0, getwidth (), GetHeight ()), paint);


//Painted hollow rectangle


//Set color


Paint.setcolor (color.red);


Set style-Hollow rectangle


Paint.setstyle (Style.stroke);


//Draw a rectangle


Canvas.drawrect (New Rect (a), paint);


//Painting text


//Set color


Paint.setcolor (Color.green);


//Painting text


canvas.drawtext ("Hello", m, paint);


//Drawing


//Generate bitmaps from the resource file


Bitmap Bitmap = Bitmapfactory.decoderesource (Getresources (), R.drawable.icon);


//Drawing


Canvas.drawbitmap (bitmap, n, paint);


  }





    }


}