Android 图像处理（类型转换，比例缩放，倒影，圆角）

Java代码

1. /**
2. *1.放大缩小图片
3. *
4. *@parambitmap
5. *@paramw
6. *@paramh
7. *@return
8. */
9. publicstaticBitmapzoomBitmap(Bitmapbitmap,intw,inth){
10. intwidth=bitmap.getWidth();
11. intheight=bitmap.getHeight();
12. Matrixmatrix=newMatrix();
13. floatscaleWidht=((float)w/width);
14. floatscaleHeight=((float)h/height);
15. matrix.postScale(scaleWidht,scaleHeight);
16. Bitmapnewbmp=Bitmap.createBitmap(bitmap,0,0,width,height,
17. matrix,true);
18. returnnewbmp;
19. }
21. /**
22. *2.获得圆角图片的方法
23. *
24. *@parambitmap
25. *@paramroundPx
26. *@return
27. */
28. publicstaticBitmapgetRoundedCornerBitmap(Bitmapbitmap,floatroundPx){
29. Bitmapoutput=Bitmap.createBitmap(bitmap.getWidth(),bitmap
30. .getHeight(),Config.ARGB_8888);
31. Canvascanvas=newCanvas(output);
32. finalintcolor=0xff424242;
33. finalPaintpaint=newPaint();
34. finalRectrect=newRect(0,0,bitmap.getWidth(),bitmap.getHeight());
35. finalRectFrectF=newRectF(rect);
36. paint.setAntiAlias(true);
37. canvas.drawARGB(0,0,0,0);
38. paint.setColor(color);
39. canvas.drawRoundRect(rectF,roundPx,roundPx,paint);
40. paint.setXfermode(newPorterDuffXfermode(Mode.SRC_IN));
41. canvas.drawBitmap(bitmap,rect,rect,paint);
42. returnoutput;
43. }
45. /**
46. *3.获得带倒影的图片方法
47. *
48. *@parambitmap
49. *@return
50. */
51. publicstaticBitmapcreateReflectionImageWithOrigin(Bitmapbitmap){
52. finalintreflectionGap=4;
53. intwidth=bitmap.getWidth();
54. intheight=bitmap.getHeight();
55. Matrixmatrix=newMatrix();
56. matrix.preScale(1,-1);
57. BitmapreflectionImage=Bitmap.createBitmap(bitmap,0,height/2,
58. width,height/2,matrix,false);
59. BitmapbitmapWithReflection=Bitmap.createBitmap(width,
60. (height+height/2),Config.ARGB_8888);
61. Canvascanvas=newCanvas(bitmapWithReflection);
62. canvas.drawBitmap(bitmap,0,0,null);
63. PaintdeafalutPaint=newPaint();
64. canvas
65. .drawRect(0,height,width,height+reflectionGap,
66. deafalutPaint);
67. canvas.drawBitmap(reflectionImage,0,height+reflectionGap,null);
68. Paintpaint=newPaint();
69. LinearGradientshader=newLinearGradient(0,bitmap.getHeight(),0,
70. bitmapWithReflection.getHeight()+reflectionGap,0x70ffffff,
71. 0x00ffffff,TileMode.CLAMP);
72. paint.setShader(shader);
73. //SettheTransfermodetobeporterduffanddestinationin
74. paint.setXfermode(newPorterDuffXfermode(Mode.DST_IN));
75. //Drawarectangleusingthepaintwithourlineargradient
76. canvas.drawRect(0,height,width,bitmapWithReflection.getHeight()
77. +reflectionGap,paint);
78. returnbitmapWithReflection;
79. }
81. /**
82. *4.将Drawable转化为Bitmap
83. *
84. *@paramdrawable
85. *@return
86. */
87. publicstaticBitmapdrawableToBitmap(Drawabledrawable){
88. intwidth=drawable.getIntrinsicWidth();
89. intheight=drawable.getIntrinsicHeight();
90. Bitmapbitmap=Bitmap.createBitmap(width,height,drawable
91. .getOpacity()!=PixelFormat.OPAQUE?Bitmap.Config.ARGB_8888
92. :Bitmap.Config.RGB_565);
93. Canvascanvas=newCanvas(bitmap);
94. drawable.setBounds(0,0,width,height);
95. drawable.draw(canvas);
96. returnbitmap;
97. }