Anti-aliasing of Android graphics

At the time of drawing, if the picture is rotated or scaled, there will always be those gorgeous jagged edges. In fact, Android comes with a solution.
Method One: Add an anti-aliasing flag to paint. The Paint object is then passed as a parameter to the canvas's drawing method.

Java code

1. Paint.setantialias (true);

Method Two: Add anti-aliasing flags to the canvas.
Some places can not use paint, directly to the canvas anti-aliasing, more convenient.

Java code

1. Canvas.setdrawfilter (new Paintflagsdrawfilter (0, Paint.anti_alias_flag|  Paint.filter_bitmap_flag));

The test code is as follows:

Java code

2. Import Android.content.Context;
4. Import Android.graphics.Bitmap;
6. Import Android.graphics.BitmapFactory;
8. Import Android.graphics.Canvas;
10. Import Android.graphics.Matrix;
12. Import Android.graphics.Paint;
14. Import Android.graphics.PaintFlagsDrawFilter;
16. Import Android.view.View;
20. Public class MyView extends View {
22. private Paintflagsdrawfilter PFD;
24. private Paint Mpaint = new Paint ();
26. private Matrix matrix = new Matrix ();
28. private Bitmap bmp;
32. Public MyView (context context) {
34. super (context);
36. Initialize ();
38. }
42. private Void Initialize () {
44. PFD = New Paintflagsdrawfilter (0, Paint.anti_alias_flag|        Paint.filter_bitmap_flag);
46. Mpaint.setantialias (true);
48. Matrix.setrotate (30);
50. Matrix.postscale (0.5f, 0.5f);
52. BMP = Bitmapfactory.decoderesource (Getresources (), r.drawable.show);
54. }
58. @Override
60. public void Dispatchdraw (canvas canvas) {
62. Canvas.translate ( 0);
64. Canvas.drawbitmap (BMP, Matrix, null);
66. Canvas.translate (0, 250);
68. Canvas.drawbitmap (BMP, Matrix, mpaint);
70. Canvas.setdrawfilter (PFD);
72. Canvas.translate (0, 250);
74. Canvas.drawbitmap (BMP, Matrix, null);
76. }
78. }

is the effect:

As you can see, both of these methods are quite effective.

Anti-aliasing of Android graphics