ReflectionImage是从android.widget.ImageView继承而来,使用方法和其他的Android控件一样
实现思路是从某个网站上剽窃过来的。
实现起来很简单,详细的解释写到注释里面,总体思路就是在Canvas里面重新把原始图片画一次,反转图片用Matrix来做,透明处理实际上是加了一层渐变的蒙板.
源码如下：
1. importandroid.content.Context;
2. importandroid.graphics.Bitmap;
3. importandroid.graphics.BitmapFactory;
4. importandroid.graphics.Canvas;
5. importandroid.graphics.LinearGradient;
6. importandroid.graphics.Matrix;
7. importandroid.graphics.Paint;
8. importandroid.graphics.PorterDuffXfermode;
9. importandroid.graphics.Bitmap.Config;
10. importandroid.graphics.PorterDuff.Mode;
11. importandroid.graphics.Shader.TileMode;
12. importandroid.graphics.drawable.BitmapDrawable;
13. importandroid.util.AttributeSet;
14. importandroid.widget.ImageView;
15. publicclassReflectionImage extendsImageView {
16. //是否为Reflection模式
17. privatebooleanmReflectionMode = true;
18. publicReflectionImage(Context context) {
19. super(context);
20. }
21. publicReflectionImage(Context context, AttributeSet attrs) {
22. super(context, attrs);
23. //取得原始图片的bitmap并重画
24. Bitmap originalImage = ((BitmapDrawable)this.getDrawable()).getBitmap();
25. DoReflection(originalImage);
26. }
27. publicReflectionImage(Context context, AttributeSet attrs,
28. intdefStyle) {
29. super(context, attrs, defStyle);
30. Bitmap originalImage = ((BitmapDrawable)this.getDrawable()).getBitmap();
31. DoReflection(originalImage);
32. }
33. publicvoidsetReflectionMode(booleanisRef) {
34. mReflectionMode = isRef;
35. }
36. publicbooleangetReflectionMode() {
37. returnmReflectionMode;
38. }
39. //偷懒了,只重写了setImageResource,和构造函数里面干了同样的事情
40. @Override
41. publicvoidsetImageResource(intresId) {
42. Bitmap originalImage = BitmapFactory.decodeResource(
43. getResources(), resId);
44. DoReflection(originalImage);
45. //super.setImageResource(resId);
46. }
47. privatevoidDoReflection(Bitmap originalImage) {
48. finalintreflectionGap = 4; //原始图片和反射图片中间的间距
49. intwidth = originalImage.getWidth();
50. intheight = originalImage.getHeight();
51.
52. //反转
53. Matrix matrix = newMatrix();
54. matrix.preScale(1, -1);
55. //reflectionImage就是下面透明的那部分,可以设置它的高度为原始的3/4,这样效果会更好些
56. Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,
57. 0, width, height, matrix, false);
58. //创建一个新的bitmap,高度为原来的两倍
59. Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height), Config.ARGB_8888);
60. Canvas canvasRef = newCanvas(bitmapWithReflection);
61.
62. //先画原始的图片
63. canvasRef.drawBitmap(originalImage, 0, 0, null);
64. //画间距
65. Paint deafaultPaint = newPaint();
66. canvasRef.drawRect(0, height, width, height + reflectionGap, deafaultPaint);
67.
68. //画被反转以后的图片
69. canvasRef.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
70. // 创建一个渐变的蒙版放在下面被反转的图片上面
71. Paint paint = newPaint();
72. LinearGradient shader = newLinearGradient(0,
73. originalImage.getHeight(), 0, bitmapWithReflection.getHeight()
74. + reflectionGap, 0x80ffffff, 0x00ffffff, TileMode.CLAMP);
75. // Set the paint to use this shader (linear gradient)
76. paint.setShader(shader);
77. // Set the Transfer mode to be porter duff and destination in
78. paint.setXfermode(newPorterDuffXfermode(Mode.DST_IN));
79. // Draw a rectangle using the paint with our linear gradient
80. canvasRef.drawRect(0, height, width, bitmapWithReflection.getHeight()
81. + reflectionGap, paint);
82. //调用ImageView中的setImageBitmap
83. this.setImageBitmap(bitmapWithReflection);
84. }
85. }
android 圆角与倒影
http://lipeng88213.iteye.com/blog/1201993
http://www.devdiv.com/article-2516-1.html
