android图片处理方法（不断收集中）
尊重原创，博客内容摘抄至：http://gundumw100.iteye.com/blog/849729
1.//压缩图片大小
2. public static Bitmap compressImage(Bitmap image) {
3.
4. ByteArrayOutputStream baos = new ByteArrayOutputStream();
5. image.compress(Bitmap.CompressFormat.JPEG, 100, baos);//质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中
6. int options = 100;
7. while ( baos.toByteArray().length / 1024>100) { //循环判断如果压缩后图片是否大于100kb,大于继续压缩
8. baos.reset();//重置baos即清空baos
9. image.compress(Bitmap.CompressFormat.JPEG, options, baos);//这里压缩options%，把压缩后的数据存放到baos中
10. options -= 10;//每次都减少10
11. }
12. ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());//把压缩后的数据baos存放到ByteArrayInputStream中
13. Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);//把ByteArrayInputStream数据生成图片
14. return bitmap;
15. }
Java代码
1./**
2. * 将彩色图转换为灰度图
3. * @param img 位图
4. * @return 返回转换好的位图
5. */
6. public Bitmap convertGreyImg(Bitmap img) {
7. int width = img.getWidth(); //获取位图的宽
8. int height = img.getHeight(); //获取位图的高
9.
10. int []pixels = new int[width * height]; //通过位图的大小创建像素点数组
11.
12. img.getPixels(pixels, 0, width, 0, 0, width, height);
13. int alpha = 0xFF << 24;
14. for(int i = 0; i < height; i++) {
15. for(int j = 0; j < width; j++) {
16. int grey = pixels[width * i + j];
17.
18. int red = ((grey & 0x00FF0000 ) >> 16);
19. int green = ((grey & 0x0000FF00) >> 8);
20. int blue = (grey & 0x000000FF);
21.
22. grey = (int)((float) red * 0.3 + (float)green * 0.59 + (float)blue * 0.11);
23. grey = alpha | (grey << 16) | (grey << 8) | grey;
24. pixels[width * i + j] = grey;
25. }
26. }
27. Bitmap result = Bitmap.createBitmap(width, height, Config.RGB_565);
28. result.setPixels(pixels, 0, width, 0, 0, width, height);
29. return result;
30. }
将一个图片切割成多个图片
有种场景，我们想将一个图片切割成多个图片。比如我们在开发一个拼图的游戏，就首先要对图片进行切割。
以下是封装好的两个类，可以实现图片的切割。仅供参考和学习。
一个是ImagePiece类，此类保存了一个Bitmap对象和一个标识图片的顺序索引的int变量。
Java代码
1.import android.graphics.Bitmap;
2.public class ImagePiece {
3. public int index = 0;
4. public Bitmap bitmap = null;
5.}
一个是ImageSplitter类，有一个静态方法split，传入的参数是要切割的Bitmap对象，和横向和竖向的切割片数。比如传入的是3、3，则横竖向都切割成3片，最终会将整个图片切割成3X3=9片。
Java代码
1.import java.util.ArrayList;
2.import java.util.List;
3.
4.import android.graphics.Bitmap;
5.
6.public class ImageSplitter {
7.
8. public static List<ImagePiece> split(Bitmap bitmap, int xPiece, int yPiece) {
9.
10. List<ImagePiece> pieces = new ArrayList<ImagePiece>(xPiece * yPiece);
11. int width = bitmap.getWidth();
12. int height = bitmap.getHeight();
13. int pieceWidth = width / 3;
14. int pieceHeight = height / 3;
15. for (int i = 0; i < yPiece; i++) {
16. for (int j = 0; j < xPiece; j++) {
17. ImagePiece piece = new ImagePiece();
18. piece.index = j + i * xPiece;
19. int xValue = j * pieceWidth;
20. int yValue = i * pieceHeight;
21. piece.bitmap = Bitmap.createBitmap(bitmap, xValue, yValue,
22. pieceWidth, pieceHeight);
23. pieces.add(piece);
24. }
25. }
26.
27. return pieces;
28. }
29.
30.}
1、图标加灰色过滤；
2、android的图片资源默认是静态的，单实例；如果两个IM好友的头像一样，最简单的都是用的软件自带头像，有一个在线，一个离线，直接改变头像的灰度，则两个用户的头像都会变灰或者在线，答案是：Drawable.mutate()。
Java代码
1.Drawable mDrawable = context.getResources().getDrawable(R.drawable.face_icon);
2.//Make this drawable mutable.
3.//A mutable drawable is guaranteed to not share its state with any other drawable.
4.mDrawable.mutate();
5.ColorMatrix cm = new ColorMatrix();
6.cm.setSaturation(0);
7.ColorMatrixColorFilter cf = new ColorMatrixColorFilter(cm);
8.mDrawable.setColorFilter(cf);
生成缩略图，抠自android launcher源码：
Java代码
1./*
2. * Copyright (C) 2008 The Android Open Source Project
3. *
4. * Licensed under the Apache License, Version 2.0 (the "License");
5. * you may not use this file except in compliance with the License.
6. * You may obtain a copy of the License at
7. *
8. * http://www.apache.org/licenses/LICENSE-2.0
9. *
10. * Unless required by applicable law or agreed to in writing, software
11. * distributed under the License is distributed on an "AS IS" BASIS,
12. * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13. * See the License for the specific language governing permissions and
14. * limitations under the License.
15. */
16.
17.package com.android.launcher;
18.
19.import android.graphics.drawable.BitmapDrawable;
20.import android.graphics.drawable.Drawable;
21.import android.graphics.drawable.PaintDrawable;
22.import android.graphics.Bitmap;
23.import android.graphics.PixelFormat;
24.import android.graphics.Canvas;
25.import android.graphics.PaintFlagsDrawFilter;
26.import android.graphics.Paint;
27.import android.graphics.Rect;
28.import android.content.res.Resources;
29.import android.content.Context;
30.
31./**
32. * Various utilities shared amongst the Launcher's classes.
33. */
34.final class Utilities {
35. private static int sIconWidth = -1;
36. private static int sIconHeight = -1;
37.
38. private static final Paint sPaint = new Paint();
39. private static final Rect sBounds = new Rect();
40. private static final Rect sOldBounds = new Rect();
41. private static Canvas sCanvas = new Canvas();
42.
43. static {
44. sCanvas.setDrawFilter(new PaintFlagsDrawFilter(Paint.DITHER_FLAG,
45. Paint.FILTER_BITMAP_FLAG));
46. }
47.
48. /**
49. * Returns a Drawable representing the thumbnail of the specified Drawable.
50. * The size of the thumbnail is defined by the dimension
51. * android.R.dimen.launcher_application_icon_size.
52. *
53. * This method is not thread-safe and should be invoked on the UI thread only.
54. *
55. * @param icon The icon to get a thumbnail of.
56. * @param context The application's context.
57. *
58. * @return A thumbnail for the specified icon or the icon itself if the
59. * thumbnail could not be created.
60. */
61. static Drawable createIconThumbnail(Drawable icon, Context context) {
62. if (sIconWidth == -1) {
63. final Resources resources = context.getResources();
64. sIconWidth = sIconHeight = (int) resources.getDimension(android.R.dimen.app_icon_size);
65. }
66.
67. int width = sIconWidth;
68. int height = sIconHeight;
69.
70. float scale = 1.0f;
71. if (icon instanceof PaintDrawable) {
72. PaintDrawable painter = (PaintDrawable) icon;
73. painter.setIntrinsicWidth(width);
74. painter.setIntrinsicHeight(height);
75. } else if (icon instanceof BitmapDrawable) {
76. // Ensure the bitmap has a density.
77. BitmapDrawable bitmapDrawable = (BitmapDrawable) icon;
78. Bitmap bitmap = bitmapDrawable.getBitmap();
79. if (bitmap.getDensity() == Bitmap.DENSITY_NONE) {
80. bitmapDrawable.setTargetDensity(context.getResources().getDisplayMetrics());
81. }
82. }
83. int iconWidth = icon.getIntrinsicWidth();
84. int iconHeight = icon.getIntrinsicHeight();
85.
86. if (width > 0 && height > 0) {
87. if (width < iconWidth || height < iconHeight || scale != 1.0f) {
88. final float ratio = (float) iconWidth / iconHeight;
89.
90. if (iconWidth > iconHeight) {
91. height = (int) (width / ratio);
92. } else if (iconHeight > iconWidth) {
93. width = (int) (height * ratio);
94. }
95.
96. final Bitmap.Config c = icon.getOpacity() != PixelFormat.OPAQUE ?
97. Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
98. final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c);
99. final Canvas canvas = sCanvas;
100. canvas.setBitmap(thumb);
101. // Copy the old bounds to restore them later
102. // If we were to do oldBounds = icon.getBounds(),
103. // the call to setBounds() that follows would
104. // change the same instance and we would lose the
105. // old bounds
106. sOldBounds.set(icon.getBounds());
107. final int x = (sIconWidth - width) / 2;
108. final int y = (sIconHeight - height) / 2;
109. icon.setBounds(x, y, x + width, y + height);
110. icon.draw(canvas);
111. icon.setBounds(sOldBounds);
112. icon = new FastBitmapDrawable(thumb);
113. } else if (iconWidth < width && iconHeight < height) {
114. final Bitmap.Config c = Bitmap.Config.ARGB_8888;
115. final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c);
116. final Canvas canvas = sCanvas;
117. canvas.setBitmap(thumb);
118. sOldBounds.set(icon.getBounds());
119. final int x = (width - iconWidth) / 2;
120. final int y = (height - iconHeight) / 2;
121. icon.setBounds(x, y, x + iconWidth, y + iconHeight);
122. icon.draw(canvas);
123. icon.setBounds(sOldBounds);
124. icon = new FastBitmapDrawable(thumb);
125. }
126. }
127.
128. return icon;
129. }
130.
131. /**
132. * Returns a Bitmap representing the thumbnail of the specified Bitmap.
133. * The size of the thumbnail is defined by the dimension
134. * android.R.dimen.launcher_application_icon_size.
135. *
136. * This method is not thread-safe and should be invoked on the UI thread only.
137. *
138. * @param bitmap The bitmap to get a thumbnail of.
139. * @param context The application's context.
140. *
141. * @return A thumbnail for the specified bitmap or the bitmap itself if the
142. * thumbnail could not be created.
143. */
144. static Bitmap createBitmapThumbnail(Bitmap bitmap, Context context) {
145. if (sIconWidth == -1) {
146. final Resources resources = context.getResources();
147. sIconWidth = sIconHeight = (int) resources.getDimension(
148. android.R.dimen.app_icon_size);
149. }
150.
151. int width = sIconWidth;
152. int height = sIconHeight;
153.
154. final int bitmapWidth = bitmap.getWidth();
155. final int bitmapHeight = bitmap.getHeight();
156.
157. if (width > 0 && height > 0) {
158. if (width < bitmapWidth || height < bitmapHeight) {
159. final float ratio = (float) bitmapWidth / bitmapHeight;
160.
161. if (bitmapWidth > bitmapHeight) {
162. height = (int) (width / ratio);
163. } else if (bitmapHeight > bitmapWidth) {
164. width = (int) (height * ratio);
165. }
166.
167. final Bitmap.Config c = (width == sIconWidth && height == sIconHeight) ?
168. bitmap.getConfig() : Bitmap.Config.ARGB_8888;
169. final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c);
170. final Canvas canvas = sCanvas;
171. final Paint paint = sPaint;
172. canvas.setBitmap(thumb);
173. paint.setDither(false);
174. paint.setFilterBitmap(true);
175. sBounds.set((sIconWidth - width) / 2, (sIconHeight - height) / 2, width, height);
176. sOldBounds.set(0, 0, bitmapWidth, bitmapHeight);
177. canvas.drawBitmap(bitmap, sOldBounds, sBounds, paint);
178. return thumb;
179. } else if (bitmapWidth < width || bitmapHeight < height) {
180. final Bitmap.Config c = Bitmap.Config.ARGB_8888;
181. final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c);
182. final Canvas canvas = sCanvas;
183. final Paint paint = sPaint;
184. canvas.setBitmap(thumb);
185. paint.setDither(false);
186. paint.setFilterBitmap(true);
187. canvas.drawBitmap(bitmap, (sIconWidth - bitmapWidth) / 2,
188. (sIconHeight - bitmapHeight) / 2, paint);
189. return thumb;
190. }
191. }
192.
193. return bitmap;
194. }
195.}
Java代码
1.//Android Matrix类实现镜像方法
2.public void drawRegion(Image image_src,
3.
4.int x_src, int y_src,
5.
6.int width, int height,
7.
8.int transform,
9.
10.int x_dest, int y_dest,
11.
12.int anchor){
13.
14.if((anchor&VCENTER) != 0){
15.
16.y_dest -= height/2;
17.
18.}else if((anchor&BOTTOM) != 0){
19.
20.y_dest -= height;
21.
22.}
23.
24.if((anchor&RIGHT) != 0){
25.
26.x_dest -= width;
27.
28.}else if((anchor&HCENTER) != 0){
29.
30.x_dest -= width/2;
31.
32.}
33.
34.Bitmap newMap = Bitmap.createBitmap(image_src.getBitmap(), x_src, y_src, width, height);
35.
36.Matrix mMatrix = new Matrix();
37.
38.Matrix temp = new Matrix();
39.
40.Matrix temp2 = new Matrix();
41.
42.float[] mirrorY = {
43.
44.-1, 0, 0,
45.0, 1, 0,
46.0, 0, 1
47.
48.};
49.
50.temp.setValues(mirrorY);
51.
52.switch(transform){
53.
54.case Sprite.TRANS_NONE:
55.
56.break;
57.
58.case Sprite.TRANS_ROT90:
59.
60.mMatrix.setRotate(90,width/2, height/2);
61.
62.break;
63.
64.case Sprite.TRANS_ROT180:
65.
66.mMatrix.setRotate(180,width/2, height/2);
67.
68.break;
69.
70.case Sprite.TRANS_ROT270:
71.
72.mMatrix.setRotate(270,width/2, height/2);
73.
74.break;
75.
76.case Sprite.TRANS_MIRROR:
77.
78.mMatrix.postConcat(temp);
79.
80.break;
81.
82.case Sprite.TRANS_MIRROR_ROT90:
83.
84.mMatrix.postConcat(temp);
85.
86.mMatrix.setRotate(90,width/2, height/2);
87.
88.break;
89.
90.case Sprite.TRANS_MIRROR_ROT180:
91.
92.mMatrix.postConcat(temp);
93.
94.mMatrix.setRotate(180,width/2, height/2);
95.
96.break;
97.
98.case Sprite.TRANS_MIRROR_ROT270:
99.
100.mMatrix.postConcat(temp);
101.
102.mMatrix.setRotate(270,width/2, height/2);
103.
104.break;
105.
106.}
107.
108.mMatrix.setTranslate(x_dest, y_dest);
109.
110.canvas.drawBitmap(newMap, mMatrix, mPaint);
111.
112.}
Java代码
1.//图片Url保存为位图并进行缩放操作
2.//通过传入图片url获取位图方法
3.public Bitmap returnBitMap(String url) {
4. URL myFileUrl = null;
5. Bitmap bitmap = null;
6. try {
7. myFileUrl = new URL(url);
8. } catch (MalformedURLException e) {
9. e.printStackTrace();
10. }
11. try {
12. HttpURLConnection conn = (HttpURLConnection) myFileUrl
13. .openConnection();
14. conn.setDoInput(true);
15. conn.connect();
16. InputStream is = conn.getInputStream();
17. bitmap = BitmapFactory.decodeStream(is);
18. is.close();
19. } catch (IOException e) {
20. e.printStackTrace();
21. }
22. Log.v(tag, bitmap.toString());
23.
24. return bitmap;
25. }
26.//通过传入位图,新的宽.高比进行位图的缩放操作
27.public static Drawable resizeImage(Bitmap bitmap, int w, int h) {
28.
29. // load the origial Bitmap
30. Bitmap BitmapOrg = bitmap;
31.
32. int width = BitmapOrg.getWidth();
33. int height = BitmapOrg.getHeight();
34. int newWidth = w;
35. int newHeight = h;
36.
37. Log.v(tag, String.valueOf(width));
38. Log.v(tag, String.valueOf(height));
39.
40. Log.v(tag, String.valueOf(newWidth));
41. Log.v(tag, String.valueOf(newHeight));
42.
43. // calculate the scale
44. float scaleWidth = ((float) newWidth) / width;
45. float scaleHeight = ((float) newHeight) / height;
46.
47. // create a matrix for the manipulation
48. Matrix matrix = new Matrix();
49. // resize the Bitmap
50. matrix.postScale(scaleWidth, scaleHeight);
51. // if you want to rotate the Bitmap
52. // matrix.postRotate(45);
53.
54. // recreate the new Bitmap
55. Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 0, 0, width,
56. height, matrix, true);
57.
58. // make a Drawable from Bitmap to allow to set the Bitmap
59. // to the ImageView, ImageButton or what ever
60. return new BitmapDrawable(resizedBitmap);
61.
62. }
Java代码
1.1.图片加载方法，方便用户加载图片
2./***
3.* 加载本地图片
4.* @param context：主运行函数实例
5.* @param bitAdress：图片地址，一般指向R下的drawable目录
6.* @return
7.*/
8.public final Bitmap CreatImage(Context context, int bitAdress) {
9.Bitmap bitmaptemp = null;
10.bitmaptemp = BitmapFactory.decodeResource(context.getResources(),
11.bitAdress);
12.return bitmaptemp;
13.}
14.2.图片平均分割方法，将大图平均分割为N行N列，方便用户使用
15./***
16.* 图片分割
17.*
18.* @param g
19.* ：画布
20.* @param paint
21.* ：画笔
22.* @param imgBit
23.* ：图片
24.* @param x
25.* ：X轴起点坐标
26.* @param y
27.* ：Y轴起点坐标
28.* @param w
29.* ：单一图片的宽度
30.* @param h
31.* ：单一图片的高度
32.* @param line
33.* ：第几列
34.* @param row
35.* ：第几行
36.*/
37.public final void cuteImage(Canvas g, Paint paint, Bitmap imgBit, int x,
38.int y, int w, int h, int line, int row) {
39.g.clipRect(x, y, x + w, h + y);
40.g.drawBitmap(imgBit, x – line * w, y – row * h, paint);
41.g.restore();
42.}
43.3.图片缩放，对当前图片进行缩放处理
44./***
45.* 图片的缩放方法
46.*
47.* @param bgimage
48.* ：源图片资源
49.* @param newWidth
50.* ：缩放后宽度
51.* @param newHeight
52.* ：缩放后高度
53.* @return
54.*/
55.public Bitmap zoomImage(Bitmap bgimage, int newWidth, int newHeight) {
56.// 获取这个图片的宽和高
57.int width = bgimage.getWidth();
58.int height = bgimage.getHeight();
59.// 创建操作图片用的matrix对象
60.Matrix matrix = new Matrix();
61.// 计算缩放率，新尺寸除原始尺寸
62.float scaleWidth = ((float) newWidth) / width;
63.float scaleHeight = ((float) newHeight) / height;
64.// 缩放图片动作
65.matrix.postScale(scaleWidth, scaleHeight);
66.Bitmap bitmap = Bitmap.createBitmap(bgimage, 0, 0, width, height,
67.matrix, true);
68.return bitmap;
69.}
70.4.绘制带有边框的文字，一般在游戏中起文字的美化作用
71./***
72.* 绘制带有边框的文字
73.*
74.* @param strMsg
75.* ：绘制内容
76.* @param g
77.* ：画布
78.* @param paint
79.* ：画笔
80.* @param setx
81.* ：：X轴起始坐标
82.* @param sety
83.* ：Y轴的起始坐标
84.* @param fg
85.* ：前景色
86.* @param bg
87.* ：背景色
88.*/
89.public void drawText(String strMsg, Canvas g, Paint paint, int setx,
90.int sety, int fg, int bg) {
91.paint.setColor(bg);
92.g.drawText(strMsg, setx + 1, sety, paint);
93.g.drawText(strMsg, setx, sety – 1, paint);
94.g.drawText(strMsg, setx, sety + 1, paint);
95.g.drawText(strMsg, setx – 1, sety, paint);
96.paint.setColor(fg);
97.g.drawText(strMsg, setx, sety, paint);
98.g.restore();
99.}
100.5.Android 图片透明度处理代码
101./**
102.* 图片透明度处理
103.*
104.* @param sourceImg
105.* 原始图片
106.* @param number
107.* 透明度
108.* @return
109.*/
110.public static Bitmap setAlpha(Bitmap sourceImg, int number) {
111.int[] argb = new int[sourceImg.getWidth() * sourceImg.getHeight()];
112.sourceImg.getPixels(argb, 0, sourceImg.getWidth(), 0, 0,sourceImg.getWidth(), sourceImg.getHeight());// 获得图片的ARGB值
113.number = number * 255 / 100;
114.for (int i = 0; i < argb.length; i++) {
115.argb = (number << 24) | (argb & 0×00FFFFFF);// 修改最高2位的值
116.}
117.sourceImg = Bitmap.createBitmap(argb, sourceImg.getWidth(), sourceImg.getHeight(), Config.ARGB_8888);
118.return sourceImg;
119.}
120.6.图片翻转
121.Resources res = this.getContext().getResources();
122.img = BitmapFactory.decodeResource(res, R.drawable.slogo);
123.Matrix matrix = new Matrix();
124.matrix.postRotate(90); /*翻转90度*/
125.int width = img.getWidth();
126.int height = img.getHeight();
127.r_img = Bitmap.createBitmap(img, 0, 0, width, height, matrix, true);
Java代码
1.import android.graphics.Bitmap;
2.import android.graphics.Canvas;
3.import android.graphics.LinearGradient;
4.import android.graphics.Matrix;
5.import android.graphics.Paint;
6.import android.graphics.PixelFormat;
7.import android.graphics.PorterDuffXfermode;
8.import android.graphics.Rect;
9.import android.graphics.RectF;
10.import android.graphics.Bitmap.Config;
11.import android.graphics.PorterDuff.Mode;
12.import android.graphics.Shader.TileMode;
13.import android.graphics.drawable.Drawable;
14./**
15.*
16.* @author superdev
17.* @version 1.0
18.*
19.*/
20.public class ImageUtil {
21.
22./**
23.* 放大缩小图片
24.*/
25.public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {
26. int width = bitmap.getWidth();
27. int height = bitmap.getHeight();
28. Matrix matrix = new Matrix();
29. float scaleWidht = ((float) w / width);
30. float scaleHeight = ((float) h / height);
31. matrix.postScale(scaleWidht, scaleHeight);
32. Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
33. return newbmp;
34.}
35.
36./**
37.* 将Drawable转化为Bitmap
38.*/
39.public static Bitmap drawableToBitmap(Drawable drawable) {
40. int width = drawable.getIntrinsicWidth();
41. int height = drawable.getIntrinsicHeight();
42. Bitmap bitmap = Bitmap.createBitmap(width, height, drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);
43. Canvas canvas = new Canvas(bitmap);
44. drawable.setBounds(0, 0, width, height);
45. drawable.draw(canvas);
46. return bitmap;
47.
48.}
49.
50./**
51.* 获得圆角图片的方法
52.*/
53.public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {
54.
55. Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
56. Canvas canvas = new Canvas(output);
57.
58. final int color = 0xff424242;
59. final Paint paint = new Paint();
60. final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
61. final RectF rectF = new RectF(rect);
62.
63. paint.setAntiAlias(true);
64. canvas.drawARGB(0, 0, 0, 0);
65. paint.setColor(color);
66. canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
67.
68. paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
69. canvas.drawBitmap(bitmap, rect, rect, paint);
70.
71. return output;
72.}
73.
74./**
75.* 获得带倒影的图片方法
76.*/
77.public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap) {
78. final int reflectionGap = 4;
79. int width = bitmap.getWidth();
80. int height = bitmap.getHeight();
81.
82. Matrix matrix = new Matrix();
83. matrix.preScale(1, -1);
84.
85. Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, height / 2, width, height / 2, matrix, false);
86.
87. Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height / 2), Config.ARGB_8888);
88.
89. Canvas canvas = new Canvas(bitmapWithReflection);
90. canvas.drawBitmap(bitmap, 0, 0, null);
91. Paint deafalutPaint = new Paint();
92. canvas.drawRect(0, height, width, height + reflectionGap, deafalutPaint);
93.
94. canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
95.
96. Paint paint = new Paint();
97. LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0, bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
98. paint.setShader(shader);
99. // Set the Transfer mode to be porter duff and destination in
100. paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
101. // Draw a rectangle using the paint with our linear gradient
102. canvas.drawRect(0, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint);
103. return bitmapWithReflection;
104.}
105.}
Java代码
1.private byte[] Bitmap2Bytes(Bitmap bm){
2. ByteArrayOutputStream baos = new ByteArrayOutputStream();
3. bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
4. return baos.toByteArray();
5.}
6.private Bitmap Bytes2Bimap(byte[] b){
7. if(b.length!=0){
8. return BitmapFactory.decodeByteArray(b, 0, b.length);
9. }
10. else {
11. return null;
12. }
13. }
14.
15. /**
16. * create the bitmap from a byte array
17. *生成水印图片
18. * @param src the bitmap object you want proecss
19. * @param watermark the water mark above the src
20. * @return return a bitmap object ,if paramter's length is 0,return null
21. */
22. private Bitmap createBitmap( Bitmap src, Bitmap watermark )
23. {
24. String tag = "createBitmap";
25. Log.d( tag, "create a new bitmap" );
26. if( src == null )
27. {
28. return null;
29. }
30.
31. int w = src.getWidth();
32. int h = src.getHeight();
33. int ww = watermark.getWidth();
34. int wh = watermark.getHeight();
35. //create the new blank bitmap
36. Bitmap newb = Bitmap.createBitmap( w, h, Config.ARGB_8888 );//创建一个新的和SRC长度宽度一样的位图
37. Canvas cv = new Canvas( newb );
38. //draw src into
39. cv.drawBitmap( src, 0, 0, null );//在 0，0坐标开始画入src
40. //draw watermark into
41. cv.drawBitmap( watermark, w - ww + 5, h - wh + 5, null );//在src的右下角画入水印
42. //save all clip
43. cv.save( Canvas.ALL_SAVE_FLAG );//保存
44. //store
45. cv.restore();//存储
46. return newb;
47. }
48. /** 重新编码Bitmap
49. *
50. * @param src
51. * 需要重新编码的Bitmap
52. *
53. * @param format
54. * 编码后的格式（目前只支持png和jpeg这两种格式）
55. *
56. * @param quality
57. * 重新生成后的bitmap的质量
58. *
59. * @return
60. * 返回重新生成后的bitmap
61. */
62. private static Bitmap codec(Bitmap src, Bitmap.CompressFormat format,
63. int quality) {
64. ByteArrayOutputStream os = new ByteArrayOutputStream();
65. src.compress(format, quality, os);
66.
67. byte[] array = os.toByteArray();
68. return BitmapFactory.decodeByteArray(array, 0, array.length);
69. }
70.
71.//Stream转换成Byte
72.static byte[] streamToBytes(InputStream is) {
73. ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
74. byte[] buffer = new byte[1024];
75. int len;
76. try {
77. while ((len = is.read(buffer)) >= 0) {
78. os.write(buffer, 0, len);
79. }
80. } catch (java.io.IOException e) {
81.
82. }
83. return os.toByteArray();
84.}
85.//把View转换成Bitmap
86.
87. /**
88. * 把一个View的对象转换成bitmap
89. */
90. static Bitmap getViewBitmap(View v) {
91.
92. v.clearFocus();
93. v.setPressed(false);
94.
95. //能画缓存就返回false
96. boolean willNotCache = v.willNotCacheDrawing();
97. v.setWillNotCacheDrawing(false);
98. int color = v.getDrawingCacheBackgroundColor();
99. v.setDrawingCacheBackgroundColor(0);
100. if (color != 0) {
101. v.destroyDrawingCache();
102. }
103. v.buildDrawingCache();
104. Bitmap cacheBitmap = v.getDrawingCache();
105. if (cacheBitmap == null) {
106. Log.e(TAG, "failed getViewBitmap(" + v + ")", new RuntimeException());
107. return null;
108. }
109. Bitmap bitmap = Bitmap.createBitmap(cacheBitmap);
110. // Restore the view
111. v.destroyDrawingCache();
112. v.setWillNotCacheDrawing(willNotCache);
113. v.setDrawingCacheBackgroundColor(color);
114. return bitmap;
115. }
Java代码
1.读取raw资源文件中的mp3文件，然后通过音乐播放器播放：
2.
3. /**
4. * 把mp3文件写入卡
5. *
6. * @param fileName
7. * 输出的文件名（全路径）
8. * @param context
9. * context对象
10. */
11. private void writeMP3ToSDcard(String fileName, Context context) {
12. byte[] buffer = new byte[1024 * 8];
13. int read;
14. BufferedInputStream bin = new BufferedInputStream(context.getResources().openRawResource(R.raw.ring));
15. try {
16. BufferedOutputStream bout = new BufferedOutputStream(new FileOutputStream(fileName));
17. while ((read = bin.read(buffer)) > -1) {
18. bout.write(buffer, 0, read);
19. }
20. bout.flush();
21. bout.close();
22. bin.close();
23. } catch (FileNotFoundException e) {
24. e.printStackTrace();
25. } catch (IOException e) {
26. e.printStackTrace();
27. }
28. }
29.
30.
31.Intent intent = new Intent();
32.intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
33.intent.setAction(android.content.Intent.ACTION_VIEW);
34.intent.setDataAndType(Uri.fromFile(newFile("XXXXmp3的文件全路径")),"audio/*");
35.startActivity(intent);
绘制图像倒影
Java代码
1.private void
2._Init()
3.{
4. m_paint = new Paint(Paint.ANTI_ALIAS_FLAG);
5. LinearGradient lg = new LinearGradient(
6. 0, 0, 0, m_nShadowH,
7. 0xB0FFFFFF, 0x00000000,
8. Shader.TileMode.CLAMP);
9. m_paint.setShader(lg);
10. m_paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY));
11.}
12.
13.@Override protected void
14.onDraw(Canvas canvas)
15.{
16. super.onDraw(canvas);
17.
18. int nX = 0;
19. int nY = 20;
20.
21. _DrawNormalImg(canvas, nX, nY);
22. _DrawMirror(canvas, nX, nY);
23.}
24.
25.private void
26._DrawNormalImg(Canvas canvas, int nX, int nY)
27.{
28. canvas.save(Canvas.MATRIX_SAVE_FLAG);
29. canvas.translate(nX, nY);
30. m_dw.draw(canvas);
31. canvas.restore();
32.}
33.
34.private void
35._DrawMirror(Canvas canvas, int nX, int nY)
36.{
37. int nW = m_dw.getIntrinsicWidth();
38. int nH = m_dw.getIntrinsicHeight();
39.
40. ///////////////////////////////////
41. //draw mirror image
42. canvas.save(Canvas.MATRIX_SAVE_FLAG);
43. canvas.scale(1.0f, -1.0f);
44. canvas.translate(nX, -(nY + nH * 2));
45. canvas.clipRect(0, nH, nW, nH - m_nShadowH);
46. m_dw.draw(canvas);
47. canvas.restore();
48.
49. //////////////////////////////
50. //draw mask
51. canvas.save();
52. canvas.translate(nX, nY + nH);
53. canvas.drawRect(0, 0, nW, m_nShadowH, m_paint);
54. canvas.restore();
55.}
Android 繪圖座標體系預設的原點在左上角，X 軸往右是越來越大的正值，而 Y 軸往下，則是越來越大的正值。要畫出垂直翻轉的圖片，其實也就是要垂直翻轉整個繪圖座標體系。在 Android 中，要如何做？答案就是 canvas.scale(1.0f, -1.0f)。很簡單吧，沒想到給 scale() 函式一個負值，就可以翻轉相對應的軸。
在 Photoshop 中，做鏡像特效的第二步是要對這翻轉的圖片，加個由灰到黑的漸層 mask。
在 Android 中，要畫漸層色，那就一定得用 LinearGradient 這個類別。至於要對背景圖加上個 mask，就請參考一下 Paint 的 setXfermode() 函式。_Init() 這個函式，就是負責生成一個由灰到黑漸層 mask 的 m_paint 物件。
http://blog.csdn.net/Android_Tutor/archive/2010/11/02/5981753.aspx
http://www.cnblogs.com/TerryBlog/archive/2012/01/08/2316482.html
android常用图片特效处理
http://www.eoeandroid.com/thread-170526-1-1.html
相机（Camera）实时滤镜效果
http://www.eoeandroid.com/thread-171528-1-1.html
Android, WindowsPhone7, IOS ,vc2010平台40多套图片滤镜开源
http://www.cnblogs.com/daizhj/archive/2012/05/15/2501406.html
Android实现获取本机中所有图片
http://www.cnblogs.com/hanyonglu/archive/2012/05/10/2494908.html
1.//压缩图片大小
2. public static Bitmap compressImage(Bitmap image) {
3.
4. ByteArrayOutputStream baos = new ByteArrayOutputStream();
5. image.compress(Bitmap.CompressFormat.JPEG, 100, baos);//质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中
6. int options = 100;
7. while ( baos.toByteArray().length / 1024>100) { //循环判断如果压缩后图片是否大于100kb,大于继续压缩
8. baos.reset();//重置baos即清空baos
9. image.compress(Bitmap.CompressFormat.JPEG, options, baos);//这里压缩options%，把压缩后的数据存放到baos中
10. options -= 10;//每次都减少10
11. }
12. ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());//把压缩后的数据baos存放到ByteArrayInputStream中
13. Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);//把ByteArrayInputStream数据生成图片
14. return bitmap;
15. }
Java代码
1./**
2. * 将彩色图转换为灰度图
3. * @param img 位图
4. * @return 返回转换好的位图
5. */
6. public Bitmap convertGreyImg(Bitmap img) {
7. int width = img.getWidth(); //获取位图的宽
8. int height = img.getHeight(); //获取位图的高
9.
10. int []pixels = new int[width * height]; //通过位图的大小创建像素点数组
11.
12. img.getPixels(pixels, 0, width, 0, 0, width, height);
13. int alpha = 0xFF << 24;
14. for(int i = 0; i < height; i++) {
15. for(int j = 0; j < width; j++) {
16. int grey = pixels[width * i + j];
17.
18. int red = ((grey & 0x00FF0000 ) >> 16);
19. int green = ((grey & 0x0000FF00) >> 8);
20. int blue = (grey & 0x000000FF);
21.
22. grey = (int)((float) red * 0.3 + (float)green * 0.59 + (float)blue * 0.11);
23. grey = alpha | (grey << 16) | (grey << 8) | grey;
24. pixels[width * i + j] = grey;
25. }
26. }
27. Bitmap result = Bitmap.createBitmap(width, height, Config.RGB_565);
28. result.setPixels(pixels, 0, width, 0, 0, width, height);
29. return result;
30. }
将一个图片切割成多个图片
有种场景，我们想将一个图片切割成多个图片。比如我们在开发一个拼图的游戏，就首先要对图片进行切割。
以下是封装好的两个类，可以实现图片的切割。仅供参考和学习。
一个是ImagePiece类，此类保存了一个Bitmap对象和一个标识图片的顺序索引的int变量。
Java代码
1.import android.graphics.Bitmap;
2.public class ImagePiece {
3. public int index = 0;
4. public Bitmap bitmap = null;
5.}
一个是ImageSplitter类，有一个静态方法split，传入的参数是要切割的Bitmap对象，和横向和竖向的切割片数。比如传入的是3、3，则横竖向都切割成3片，最终会将整个图片切割成3X3=9片。
Java代码
1.import java.util.ArrayList;
2.import java.util.List;
3.
4.import android.graphics.Bitmap;
5.
6.public class ImageSplitter {
7.
8. public static List<ImagePiece> split(Bitmap bitmap, int xPiece, int yPiece) {
9.
10. List<ImagePiece> pieces = new ArrayList<ImagePiece>(xPiece * yPiece);
11. int width = bitmap.getWidth();
12. int height = bitmap.getHeight();
13. int pieceWidth = width / 3;
14. int pieceHeight = height / 3;
15. for (int i = 0; i < yPiece; i++) {
16. for (int j = 0; j < xPiece; j++) {
17. ImagePiece piece = new ImagePiece();
18. piece.index = j + i * xPiece;
19. int xValue = j * pieceWidth;
20. int yValue = i * pieceHeight;
21. piece.bitmap = Bitmap.createBitmap(bitmap, xValue, yValue,
22. pieceWidth, pieceHeight);
23. pieces.add(piece);
24. }
25. }
26.
27. return pieces;
28. }
29.
30.}
1、图标加灰色过滤；
2、android的图片资源默认是静态的，单实例；如果两个IM好友的头像一样，最简单的都是用的软件自带头像，有一个在线，一个离线，直接改变头像的灰度，则两个用户的头像都会变灰或者在线，答案是：Drawable.mutate()。
Java代码
1.Drawable mDrawable = context.getResources().getDrawable(R.drawable.face_icon);
2.//Make this drawable mutable.
3.//A mutable drawable is guaranteed to not share its state with any other drawable.
4.mDrawable.mutate();
5.ColorMatrix cm = new ColorMatrix();
6.cm.setSaturation(0);
7.ColorMatrixColorFilter cf = new ColorMatrixColorFilter(cm);
8.mDrawable.setColorFilter(cf);
生成缩略图，抠自android launcher源码：
Java代码
1./*
2. * Copyright (C) 2008 The Android Open Source Project
3. *
4. * Licensed under the Apache License, Version 2.0 (the "License");
5. * you may not use this file except in compliance with the License.
6. * You may obtain a copy of the License at
7. *
8. * http://www.apache.org/licenses/LICENSE-2.0
9. *
10. * Unless required by applicable law or agreed to in writing, software
11. * distributed under the License is distributed on an "AS IS" BASIS,
12. * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13. * See the License for the specific language governing permissions and
14. * limitations under the License.
15. */
16.
17.package com.android.launcher;
18.
19.import android.graphics.drawable.BitmapDrawable;
20.import android.graphics.drawable.Drawable;
21.import android.graphics.drawable.PaintDrawable;
22.import android.graphics.Bitmap;
23.import android.graphics.PixelFormat;
24.import android.graphics.Canvas;
25.import android.graphics.PaintFlagsDrawFilter;
26.import android.graphics.Paint;
27.import android.graphics.Rect;
28.import android.content.res.Resources;
29.import android.content.Context;
30.
31./**
32. * Various utilities shared amongst the Launcher's classes.
33. */
34.final class Utilities {
35. private static int sIconWidth = -1;
36. private static int sIconHeight = -1;
37.
38. private static final Paint sPaint = new Paint();
39. private static final Rect sBounds = new Rect();
40. private static final Rect sOldBounds = new Rect();
41. private static Canvas sCanvas = new Canvas();
42.
43. static {
44. sCanvas.setDrawFilter(new PaintFlagsDrawFilter(Paint.DITHER_FLAG,
45. Paint.FILTER_BITMAP_FLAG));
46. }
47.
48. /**
49. * Returns a Drawable representing the thumbnail of the specified Drawable.
50. * The size of the thumbnail is defined by the dimension
51. * android.R.dimen.launcher_application_icon_size.
52. *
53. * This method is not thread-safe and should be invoked on the UI thread only.
54. *
55. * @param icon The icon to get a thumbnail of.
56. * @param context The application's context.
57. *
58. * @return A thumbnail for the specified icon or the icon itself if the
59. * thumbnail could not be created.
60. */
61. static Drawable createIconThumbnail(Drawable icon, Context context) {
62. if (sIconWidth == -1) {
63. final Resources resources = context.getResources();
64. sIconWidth = sIconHeight = (int) resources.getDimension(android.R.dimen.app_icon_size);
65. }
66.
67. int width = sIconWidth;
68. int height = sIconHeight;
69.
70. float scale = 1.0f;
71. if (icon instanceof PaintDrawable) {
72. PaintDrawable painter = (PaintDrawable) icon;
73. painter.setIntrinsicWidth(width);
74. painter.setIntrinsicHeight(height);
75. } else if (icon instanceof BitmapDrawable) {
76. // Ensure the bitmap has a density.
77. BitmapDrawable bitmapDrawable = (BitmapDrawable) icon;
78. Bitmap bitmap = bitmapDrawable.getBitmap();
79. if (bitmap.getDensity() == Bitmap.DENSITY_NONE) {
80. bitmapDrawable.setTargetDensity(context.getResources().getDisplayMetrics());
81. }
82. }
83. int iconWidth = icon.getIntrinsicWidth();
84. int iconHeight = icon.getIntrinsicHeight();
85.
86. if (width > 0 && height > 0) {
87. if (width < iconWidth || height < iconHeight || scale != 1.0f) {
88. final float ratio = (float) iconWidth / iconHeight;
89.
90. if (iconWidth > iconHeight) {
91. height = (int) (width / ratio);
92. } else if (iconHeight > iconWidth) {
93. width = (int) (height * ratio);
94. }
95.
96. final Bitmap.Config c = icon.getOpacity() != PixelFormat.OPAQUE ?
97. Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
98. final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c);
99. final Canvas canvas = sCanvas;
100. canvas.setBitmap(thumb);
101. // Copy the old bounds to restore them later
102. // If we were to do oldBounds = icon.getBounds(),
103. // the call to setBounds() that follows would
104. // change the same instance and we would lose the
105. // old bounds
106. sOldBounds.set(icon.getBounds());
107. final int x = (sIconWidth - width) / 2;
108. final int y = (sIconHeight - height) / 2;
109. icon.setBounds(x, y, x + width, y + height);
110. icon.draw(canvas);
111. icon.setBounds(sOldBounds);
112. icon = new FastBitmapDrawable(thumb);
113. } else if (iconWidth < width && iconHeight < height) {
114. final Bitmap.Config c = Bitmap.Config.ARGB_8888;
115. final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c);
116. final Canvas canvas = sCanvas;
117. canvas.setBitmap(thumb);
118. sOldBounds.set(icon.getBounds());
119. final int x = (width - iconWidth) / 2;
120. final int y = (height - iconHeight) / 2;
121. icon.setBounds(x, y, x + iconWidth, y + iconHeight);
122. icon.draw(canvas);
123. icon.setBounds(sOldBounds);
124. icon = new FastBitmapDrawable(thumb);
125. }
126. }
127.
128. return icon;
129. }
130.
131. /**
132. * Returns a Bitmap representing the thumbnail of the specified Bitmap.
133. * The size of the thumbnail is defined by the dimension
134. * android.R.dimen.launcher_application_icon_size.
135. *
136. * This method is not thread-safe and should be invoked on the UI thread only.
137. *
138. * @param bitmap The bitmap to get a thumbnail of.
139. * @param context The application's context.
140. *
141. * @return A thumbnail for the specified bitmap or the bitmap itself if the
142. * thumbnail could not be created.
143. */
144. static Bitmap createBitmapThumbnail(Bitmap bitmap, Context context) {
145. if (sIconWidth == -1) {
146. final Resources resources = context.getResources();
147. sIconWidth = sIconHeight = (int) resources.getDimension(
148. android.R.dimen.app_icon_size);
149. }
150.
151. int width = sIconWidth;
152. int height = sIconHeight;
153.
154. final int bitmapWidth = bitmap.getWidth();
155. final int bitmapHeight = bitmap.getHeight();
156.
157. if (width > 0 && height > 0) {
158. if (width < bitmapWidth || height < bitmapHeight) {
159. final float ratio = (float) bitmapWidth / bitmapHeight;
160.
161. if (bitmapWidth > bitmapHeight) {
162. height = (int) (width / ratio);
163. } else if (bitmapHeight > bitmapWidth) {
164. width = (int) (height * ratio);
165. }
166.
167. final Bitmap.Config c = (width == sIconWidth && height == sIconHeight) ?
168. bitmap.getConfig() : Bitmap.Config.ARGB_8888;
169. final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c);
170. final Canvas canvas = sCanvas;
171. final Paint paint = sPaint;
172. canvas.setBitmap(thumb);
173. paint.setDither(false);
174. paint.setFilterBitmap(true);
175. sBounds.set((sIconWidth - width) / 2, (sIconHeight - height) / 2, width, height);
176. sOldBounds.set(0, 0, bitmapWidth, bitmapHeight);
177. canvas.drawBitmap(bitmap, sOldBounds, sBounds, paint);
178. return thumb;
179. } else if (bitmapWidth < width || bitmapHeight < height) {
180. final Bitmap.Config c = Bitmap.Config.ARGB_8888;
181. final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c);
182. final Canvas canvas = sCanvas;
183. final Paint paint = sPaint;
184. canvas.setBitmap(thumb);
185. paint.setDither(false);
186. paint.setFilterBitmap(true);
187. canvas.drawBitmap(bitmap, (sIconWidth - bitmapWidth) / 2,
188. (sIconHeight - bitmapHeight) / 2, paint);
189. return thumb;
190. }
191. }
192.
193. return bitmap;
194. }
195.}
Java代码
1.//Android Matrix类实现镜像方法
2.public void drawRegion(Image image_src,
3.
4.int x_src, int y_src,
5.
6.int width, int height,
7.
8.int transform,
9.
10.int x_dest, int y_dest,
11.
12.int anchor){
13.
14.if((anchor&VCENTER) != 0){
15.
16.y_dest -= height/2;
17.
18.}else if((anchor&BOTTOM) != 0){
19.
20.y_dest -= height;
21.
22.}
23.
24.if((anchor&RIGHT) != 0){
25.
26.x_dest -= width;
27.
28.}else if((anchor&HCENTER) != 0){
29.
30.x_dest -= width/2;
31.
32.}
33.
34.Bitmap newMap = Bitmap.createBitmap(image_src.getBitmap(), x_src, y_src, width, height);
35.
36.Matrix mMatrix = new Matrix();
37.
38.Matrix temp = new Matrix();
39.
40.Matrix temp2 = new Matrix();
41.
42.float[] mirrorY = {
43.
44.-1, 0, 0,
45.0, 1, 0,
46.0, 0, 1
47.
48.};
49.
50.temp.setValues(mirrorY);
51.
52.switch(transform){
53.
54.case Sprite.TRANS_NONE:
55.
56.break;
57.
58.case Sprite.TRANS_ROT90:
59.
60.mMatrix.setRotate(90,width/2, height/2);
61.
62.break;
63.
64.case Sprite.TRANS_ROT180:
65.
66.mMatrix.setRotate(180,width/2, height/2);
67.
68.break;
69.
70.case Sprite.TRANS_ROT270:
71.
72.mMatrix.setRotate(270,width/2, height/2);
73.
74.break;
75.
76.case Sprite.TRANS_MIRROR:
77.
78.mMatrix.postConcat(temp);
79.
80.break;
81.
82.case Sprite.TRANS_MIRROR_ROT90:
83.
84.mMatrix.postConcat(temp);
85.
86.mMatrix.setRotate(90,width/2, height/2);
87.
88.break;
89.
90.case Sprite.TRANS_MIRROR_ROT180:
91.
92.mMatrix.postConcat(temp);
93.
94.mMatrix.setRotate(180,width/2, height/2);
95.
96.break;
97.
98.case Sprite.TRANS_MIRROR_ROT270:
99.
100.mMatrix.postConcat(temp);
101.
102.mMatrix.setRotate(270,width/2, height/2);
103.
104.break;
105.
106.}
107.
108.mMatrix.setTranslate(x_dest, y_dest);
109.
110.canvas.drawBitmap(newMap, mMatrix, mPaint);
111.
112.}
Java代码
1.//图片Url保存为位图并进行缩放操作
2.//通过传入图片url获取位图方法
3.public Bitmap returnBitMap(String url) {
4. URL myFileUrl = null;
5. Bitmap bitmap = null;
6. try {
7. myFileUrl = new URL(url);
8. } catch (MalformedURLException e) {
9. e.printStackTrace();
10. }
11. try {
12. HttpURLConnection conn = (HttpURLConnection) myFileUrl
13. .openConnection();
14. conn.setDoInput(true);
15. conn.connect();
16. InputStream is = conn.getInputStream();
17. bitmap = BitmapFactory.decodeStream(is);
18. is.close();
19. } catch (IOException e) {
20. e.printStackTrace();
21. }
22. Log.v(tag, bitmap.toString());
23.
24. return bitmap;
25. }
26.//通过传入位图,新的宽.高比进行位图的缩放操作
27.public static Drawable resizeImage(Bitmap bitmap, int w, int h) {
28.
29. // load the origial Bitmap
30. Bitmap BitmapOrg = bitmap;
31.
32. int width = BitmapOrg.getWidth();
33. int height = BitmapOrg.getHeight();
34. int newWidth = w;
35. int newHeight = h;
36.
37. Log.v(tag, String.valueOf(width));
38. Log.v(tag, String.valueOf(height));
39.
40. Log.v(tag, String.valueOf(newWidth));
41. Log.v(tag, String.valueOf(newHeight));
42.
43. // calculate the scale
44. float scaleWidth = ((float) newWidth) / width;
45. float scaleHeight = ((float) newHeight) / height;
46.
47. // create a matrix for the manipulation
48. Matrix matrix = new Matrix();
49. // resize the Bitmap
50. matrix.postScale(scaleWidth, scaleHeight);
51. // if you want to rotate the Bitmap
52. // matrix.postRotate(45);
53.
54. // recreate the new Bitmap
55. Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 0, 0, width,
56. height, matrix, true);
57.
58. // make a Drawable from Bitmap to allow to set the Bitmap
59. // to the ImageView, ImageButton or what ever
60. return new BitmapDrawable(resizedBitmap);
61.
62. }
Java代码
1.1.图片加载方法，方便用户加载图片
2./***
3.* 加载本地图片
4.* @param context：主运行函数实例
5.* @param bitAdress：图片地址，一般指向R下的drawable目录
6.* @return
7.*/
8.public final Bitmap CreatImage(Context context, int bitAdress) {
9.Bitmap bitmaptemp = null;
10.bitmaptemp = BitmapFactory.decodeResource(context.getResources(),
11.bitAdress);
12.return bitmaptemp;
13.}
14.2.图片平均分割方法，将大图平均分割为N行N列，方便用户使用
15./***
16.* 图片分割
17.*
18.* @param g
19.* ：画布
20.* @param paint
21.* ：画笔
22.* @param imgBit
23.* ：图片
24.* @param x
25.* ：X轴起点坐标
26.* @param y
27.* ：Y轴起点坐标
28.* @param w
29.* ：单一图片的宽度
30.* @param h
31.* ：单一图片的高度
32.* @param line
33.* ：第几列
34.* @param row
35.* ：第几行
36.*/
37.public final void cuteImage(Canvas g, Paint paint, Bitmap imgBit, int x,
38.int y, int w, int h, int line, int row) {
39.g.clipRect(x, y, x + w, h + y);
40.g.drawBitmap(imgBit, x – line * w, y – row * h, paint);
41.g.restore();
42.}
43.3.图片缩放，对当前图片进行缩放处理
44./***
45.* 图片的缩放方法
46.*
47.* @param bgimage
48.* ：源图片资源
49.* @param newWidth
50.* ：缩放后宽度
51.* @param newHeight
52.* ：缩放后高度
53.* @return
54.*/
55.public Bitmap zoomImage(Bitmap bgimage, int newWidth, int newHeight) {
56.// 获取这个图片的宽和高
57.int width = bgimage.getWidth();
58.int height = bgimage.getHeight();
59.// 创建操作图片用的matrix对象
60.Matrix matrix = new Matrix();
61.// 计算缩放率，新尺寸除原始尺寸
62.float scaleWidth = ((float) newWidth) / width;
63.float scaleHeight = ((float) newHeight) / height;
64.// 缩放图片动作
65.matrix.postScale(scaleWidth, scaleHeight);
66.Bitmap bitmap = Bitmap.createBitmap(bgimage, 0, 0, width, height,
67.matrix, true);
68.return bitmap;
69.}
70.4.绘制带有边框的文字，一般在游戏中起文字的美化作用
71./***
72.* 绘制带有边框的文字
73.*
74.* @param strMsg
75.* ：绘制内容
76.* @param g
77.* ：画布
78.* @param paint
79.* ：画笔
80.* @param setx
81.* ：：X轴起始坐标
82.* @param sety
83.* ：Y轴的起始坐标
84.* @param fg
85.* ：前景色
86.* @param bg
87.* ：背景色
88.*/
89.public void drawText(String strMsg, Canvas g, Paint paint, int setx,
90.int sety, int fg, int bg) {
91.paint.setColor(bg);
92.g.drawText(strMsg, setx + 1, sety, paint);
93.g.drawText(strMsg, setx, sety – 1, paint);
94.g.drawText(strMsg, setx, sety + 1, paint);
95.g.drawText(strMsg, setx – 1, sety, paint);
96.paint.setColor(fg);
97.g.drawText(strMsg, setx, sety, paint);
98.g.restore();
99.}
100.5.Android 图片透明度处理代码
101./**
102.* 图片透明度处理
103.*
104.* @param sourceImg
105.* 原始图片
106.* @param number
107.* 透明度
108.* @return
109.*/
110.public static Bitmap setAlpha(Bitmap sourceImg, int number) {
111.int[] argb = new int[sourceImg.getWidth() * sourceImg.getHeight()];
112.sourceImg.getPixels(argb, 0, sourceImg.getWidth(), 0, 0,sourceImg.getWidth(), sourceImg.getHeight());// 获得图片的ARGB值
113.number = number * 255 / 100;
114.for (int i = 0; i < argb.length; i++) {
115.argb = (number << 24) | (argb & 0×00FFFFFF);// 修改最高2位的值
116.}
117.sourceImg = Bitmap.createBitmap(argb, sourceImg.getWidth(), sourceImg.getHeight(), Config.ARGB_8888);
118.return sourceImg;
119.}
120.6.图片翻转
121.Resources res = this.getContext().getResources();
122.img = BitmapFactory.decodeResource(res, R.drawable.slogo);
123.Matrix matrix = new Matrix();
124.matrix.postRotate(90); /*翻转90度*/
125.int width = img.getWidth();
126.int height = img.getHeight();
127.r_img = Bitmap.createBitmap(img, 0, 0, width, height, matrix, true);
Java代码
1.import android.graphics.Bitmap;
2.import android.graphics.Canvas;
3.import android.graphics.LinearGradient;
4.import android.graphics.Matrix;
5.import android.graphics.Paint;
6.import android.graphics.PixelFormat;
7.import android.graphics.PorterDuffXfermode;
8.import android.graphics.Rect;
9.import android.graphics.RectF;
10.import android.graphics.Bitmap.Config;
11.import android.graphics.PorterDuff.Mode;
12.import android.graphics.Shader.TileMode;
13.import android.graphics.drawable.Drawable;
14./**
15.*
16.* @author superdev
17.* @version 1.0
18.*
19.*/
20.public class ImageUtil {
21.
22./**
23.* 放大缩小图片
24.*/
25.public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {
26. int width = bitmap.getWidth();
27. int height = bitmap.getHeight();
28. Matrix matrix = new Matrix();
29. float scaleWidht = ((float) w / width);
30. float scaleHeight = ((float) h / height);
31. matrix.postScale(scaleWidht, scaleHeight);
32. Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
33. return newbmp;
34.}
35.
36./**
37.* 将Drawable转化为Bitmap
38.*/
39.public static Bitmap drawableToBitmap(Drawable drawable) {
40. int width = drawable.getIntrinsicWidth();
41. int height = drawable.getIntrinsicHeight();
42. Bitmap bitmap = Bitmap.createBitmap(width, height, drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);
43. Canvas canvas = new Canvas(bitmap);
44. drawable.setBounds(0, 0, width, height);
45. drawable.draw(canvas);
46. return bitmap;
47.
48.}
49.
50./**
51.* 获得圆角图片的方法
52.*/
53.public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {
54.
55. Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
56. Canvas canvas = new Canvas(output);
57.
58. final int color = 0xff424242;
59. final Paint paint = new Paint();
60. final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
61. final RectF rectF = new RectF(rect);
62.
63. paint.setAntiAlias(true);
64. canvas.drawARGB(0, 0, 0, 0);
65. paint.setColor(color);
66. canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
67.
68. paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
69. canvas.drawBitmap(bitmap, rect, rect, paint);
70.
71. return output;
72.}
73.
74./**
75.* 获得带倒影的图片方法
76.*/
77.public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap) {
78. final int reflectionGap = 4;
79. int width = bitmap.getWidth();
80. int height = bitmap.getHeight();
81.
82. Matrix matrix = new Matrix();
83. matrix.preScale(1, -1);
84.
85. Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, height / 2, width, height / 2, matrix, false);
86.
87. Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height / 2), Config.ARGB_8888);
88.
89. Canvas canvas = new Canvas(bitmapWithReflection);
90. canvas.drawBitmap(bitmap, 0, 0, null);
91. Paint deafalutPaint = new Paint();
92. canvas.drawRect(0, height, width, height + reflectionGap, deafalutPaint);
93.
94. canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
95.
96. Paint paint = new Paint();
97. LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0, bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
98. paint.setShader(shader);
99. // Set the Transfer mode to be porter duff and destination in
100. paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
101. // Draw a rectangle using the paint with our linear gradient
102. canvas.drawRect(0, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint);
103. return bitmapWithReflection;
104.}
105.}
Java代码
1.private byte[] Bitmap2Bytes(Bitmap bm){
2. ByteArrayOutputStream baos = new ByteArrayOutputStream();
3. bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
4. return baos.toByteArray();
5.}
6.private Bitmap Bytes2Bimap(byte[] b){
7. if(b.length!=0){
8. return BitmapFactory.decodeByteArray(b, 0, b.length);
9. }
10. else {
11. return null;
12. }
13. }
14.
15. /**
16. * create the bitmap from a byte array
17. *生成水印图片
18. * @param src the bitmap object you want proecss
19. * @param watermark the water mark above the src
20. * @return return a bitmap object ,if paramter's length is 0,return null
21. */
22. private Bitmap createBitmap( Bitmap src, Bitmap watermark )
23. {
24. String tag = "createBitmap";
25. Log.d( tag, "create a new bitmap" );
26. if( src == null )
27. {
28. return null;
29. }
30.
31. int w = src.getWidth();
32. int h = src.getHeight();
33. int ww = watermark.getWidth();
34. int wh = watermark.getHeight();
35. //create the new blank bitmap
36. Bitmap newb = Bitmap.createBitmap( w, h, Config.ARGB_8888 );//创建一个新的和SRC长度宽度一样的位图
37. Canvas cv = new Canvas( newb );
38. //draw src into
39. cv.drawBitmap( src, 0, 0, null );//在 0，0坐标开始画入src
40. //draw watermark into
41. cv.drawBitmap( watermark, w - ww + 5, h - wh + 5, null );//在src的右下角画入水印
42. //save all clip
43. cv.save( Canvas.ALL_SAVE_FLAG );//保存
44. //store
45. cv.restore();//存储
46. return newb;
47. }
48. /** 重新编码Bitmap
49. *
50. * @param src
51. * 需要重新编码的Bitmap
52. *
53. * @param format
54. * 编码后的格式（目前只支持png和jpeg这两种格式）
55. *
56. * @param quality
57. * 重新生成后的bitmap的质量
58. *
59. * @return
60. * 返回重新生成后的bitmap
61. */
62. private static Bitmap codec(Bitmap src, Bitmap.CompressFormat format,
63. int quality) {
64. ByteArrayOutputStream os = new ByteArrayOutputStream();
65. src.compress(format, quality, os);
66.
67. byte[] array = os.toByteArray();
68. return BitmapFactory.decodeByteArray(array, 0, array.length);
69. }
70.
71.//Stream转换成Byte
72.static byte[] streamToBytes(InputStream is) {
73. ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
74. byte[] buffer = new byte[1024];
75. int len;
76. try {
77. while ((len = is.read(buffer)) >= 0) {
78. os.write(buffer, 0, len);
79. }
80. } catch (java.io.IOException e) {
81.
82. }
83. return os.toByteArray();
84.}
85.//把View转换成Bitmap
86.
87. /**
88. * 把一个View的对象转换成bitmap
89. */
90. static Bitmap getViewBitmap(View v) {
91.
92. v.clearFocus();
93. v.setPressed(false);
94.
95. //能画缓存就返回false
96. boolean willNotCache = v.willNotCacheDrawing();
97. v.setWillNotCacheDrawing(false);
98. int color = v.getDrawingCacheBackgroundColor();
99. v.setDrawingCacheBackgroundColor(0);
100. if (color != 0) {
101. v.destroyDrawingCache();
102. }
103. v.buildDrawingCache();
104. Bitmap cacheBitmap = v.getDrawingCache();
105. if (cacheBitmap == null) {
106. Log.e(TAG, "failed getViewBitmap(" + v + ")", new RuntimeException());
107. return null;
108. }
109. Bitmap bitmap = Bitmap.createBitmap(cacheBitmap);
110. // Restore the view
111. v.destroyDrawingCache();
112. v.setWillNotCacheDrawing(willNotCache);
113. v.setDrawingCacheBackgroundColor(color);
114. return bitmap;
115. }
Java代码
1.读取raw资源文件中的mp3文件，然后通过音乐播放器播放：
2.
3. /**
4. * 把mp3文件写入卡
5. *
6. * @param fileName
7. * 输出的文件名（全路径）
8. * @param context
9. * context对象
10. */
11. private void writeMP3ToSDcard(String fileName, Context context) {
12. byte[] buffer = new byte[1024 * 8];
13. int read;
14. BufferedInputStream bin = new BufferedInputStream(context.getResources().openRawResource(R.raw.ring));
15. try {
16. BufferedOutputStream bout = new BufferedOutputStream(new FileOutputStream(fileName));
17. while ((read = bin.read(buffer)) > -1) {
18. bout.write(buffer, 0, read);
19. }
20. bout.flush();
21. bout.close();
22. bin.close();
23. } catch (FileNotFoundException e) {
24. e.printStackTrace();
25. } catch (IOException e) {
26. e.printStackTrace();
27. }
28. }
29.
30.
31.Intent intent = new Intent();
32.intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
33.intent.setAction(android.content.Intent.ACTION_VIEW);
34.intent.setDataAndType(Uri.fromFile(newFile("XXXXmp3的文件全路径")),"audio/*");
35.startActivity(intent);
绘制图像倒影
Java代码
1.private void
2._Init()
3.{
4. m_paint = new Paint(Paint.ANTI_ALIAS_FLAG);
5. LinearGradient lg = new LinearGradient(
6. 0, 0, 0, m_nShadowH,
7. 0xB0FFFFFF, 0x00000000,
8. Shader.TileMode.CLAMP);
9. m_paint.setShader(lg);
10. m_paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY));
11.}
12.
13.@Override protected void
14.onDraw(Canvas canvas)
15.{
16. super.onDraw(canvas);
17.
18. int nX = 0;
19. int nY = 20;
20.
21. _DrawNormalImg(canvas, nX, nY);
22. _DrawMirror(canvas, nX, nY);
23.}
24.
25.private void
26._DrawNormalImg(Canvas canvas, int nX, int nY)
27.{
28. canvas.save(Canvas.MATRIX_SAVE_FLAG);
29. canvas.translate(nX, nY);
30. m_dw.draw(canvas);
31. canvas.restore();
32.}
33.
34.private void
35._DrawMirror(Canvas canvas, int nX, int nY)
36.{
37. int nW = m_dw.getIntrinsicWidth();
38. int nH = m_dw.getIntrinsicHeight();
39.
40. ///////////////////////////////////
41. //draw mirror image
42. canvas.save(Canvas.MATRIX_SAVE_FLAG);
43. canvas.scale(1.0f, -1.0f);
44. canvas.translate(nX, -(nY + nH * 2));
45. canvas.clipRect(0, nH, nW, nH - m_nShadowH);
46. m_dw.draw(canvas);
47. canvas.restore();
48.
49. //////////////////////////////
50. //draw mask
51. canvas.save();
52. canvas.translate(nX, nY + nH);
53. canvas.drawRect(0, 0, nW, m_nShadowH, m_paint);
54. canvas.restore();
55.}
Android 繪圖座標體系預設的原點在左上角，X 軸往右是越來越大的正值，而 Y 軸往下，則是越來越大的正值。要畫出垂直翻轉的圖片，其實也就是要垂直翻轉整個繪圖座標體系。在 Android 中，要如何做？答案就是 canvas.scale(1.0f, -1.0f)。很簡單吧，沒想到給 scale() 函式一個負值，就可以翻轉相對應的軸。
在 Photoshop 中，做鏡像特效的第二步是要對這翻轉的圖片，加個由灰到黑的漸層 mask。
在 Android 中，要畫漸層色，那就一定得用 LinearGradient 這個類別。至於要對背景圖加上個 mask，就請參考一下 Paint 的 setXfermode() 函式。_Init() 這個函式，就是負責生成一個由灰到黑漸層 mask 的 m_paint 物件。
http://blog.csdn.net/Android_Tutor/archive/2010/11/02/5981753.aspx
http://www.cnblogs.com/TerryBlog/archive/2012/01/08/2316482.html
android常用图片特效处理
http://www.eoeandroid.com/thread-170526-1-1.html
相机（Camera）实时滤镜效果
http://www.eoeandroid.com/thread-171528-1-1.html
Android, WindowsPhone7, IOS ,vc2010平台40多套图片滤镜开源
http://www.cnblogs.com/daizhj/archive/2012/05/15/2501406.html
Android实现获取本机中所有图片
http://www.cnblogs.com/hanyonglu/archive/2012/05/10/2494908.html