Android中图片的处理（放大缩小，去色，转换格式，增加水印等），多张图片四个方位的图片合成，改变bitmap大小，图片去色等功能
Java代码 1.package com.dzh.operateimage;
2.import android.graphics.Bitmap;
3.import android.graphics.Bitmap.Config;
4.import android.graphics.BitmapFactory;
5.import android.graphics.Canvas;
6.import android.graphics.ColorMatrix;
7.import android.graphics.ColorMatrixColorFilter;
8.import android.graphics.Paint;
9.import android.graphics.PorterDuff.Mode;
10.import android.graphics.PorterDuffXfermode;
11.import android.graphics.Rect;
12.import android.graphics.RectF;
13.import android.graphics.drawable.BitmapDrawable;
14.import android.graphics.drawable.Drawable;
15.import java.io.ByteArrayOutputStream;
16.import java.io.File;
17.import java.io.FileNotFoundException;
18.import java.io.FileOutputStream;
19.import java.io.IOException;
20./**
21.* 处理图片的工具类.
22.*/
23.public class ImageTools {
24.public static final int LEFT = 0;
25.public static final int RIGHT = 1;
26.public static final int TOP = 3;
27.public static final int BOTTOM = 4;
28./** */
29./**
30.* 图片去色,返回灰度图片
31.*
32.* @param bmpOriginal 传入的图片
33.* @return 去色后的图片
34.*/
35.public static Bitmap toGrayscale(Bitmap bmpOriginal) {
36.int width, height;
37.height = bmpOriginal.getHeight();
38.width = bmpOriginal.getWidth();
39.Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
40.Canvas c = new Canvas(bmpGrayscale);
41.Paint paint = new Paint();
42.ColorMatrix cm = new ColorMatrix();
43.cm.setSaturation(0);
44.ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
45.paint.setColorFilter(f);
46.c.drawBitmap(bmpOriginal, 0, 0, paint);
47.return bmpGrayscale;
48.}
49./** */
50./**
51.* 去色同时加圆角
52.*
53.* @param bmpOriginal 原图
54.* @param pixels 圆角弧度
55.* @return 修改后的图片
56.*/
57.public static Bitmap toGrayscale(Bitmap bmpOriginal, int pixels) {
58.return toRoundCorner(toGrayscale(bmpOriginal), pixels);
59.}
60./** */
61./**
62.* 把图片变成圆角
63.*
64.* @param bitmap 需要修改的图片
65.* @param pixels 圆角的弧度
66.* @return 圆角图片
67.*/
68.public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {
69.Bitmap output = Bitmap
70..createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
71.Canvas canvas = new Canvas(output);
72.final int color = 0xff424242;
73.final Paint paint = new Paint();
74.final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
75.final RectF rectF = new RectF(rect);
76.final float roundPx = pixels;
77.paint.setAntiAlias(true);
78.canvas.drawARGB(0, 0, 0, 0);
79.paint.setColor(color);
80.canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
81.paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
82.canvas.drawBitmap(bitmap, rect, rect, paint);
83.return output;
84.}
85./** */
86./**
87.* 使圆角功能支持BitampDrawable
88.*
89.* @param bitmapDrawable
90.* @param pixels
91.* @return
92.*/
93.public static BitmapDrawable toRoundCorner(BitmapDrawable bitmapDrawable, int pixels) {
94.Bitmap bitmap = bitmapDrawable.getBitmap();
95.bitmapDrawable = new BitmapDrawable(toRoundCorner(bitmap, pixels));
96.return bitmapDrawable;
97.}
98./**
99.* 读取路径中的图片，然后将其转化为缩放后的bitmap
100.*
101.* @param path
102.*/
103.public static void saveBefore(String path) {
104.BitmapFactory.Options options = new BitmapFactory.Options();
105.options.inJustDecodeBounds = true;
106.// 获取这个图片的宽和高
107.Bitmap bitmap = BitmapFactory.decodeFile(path, options); // 此时返回bm为空
108.options.inJustDecodeBounds = false;
109.// 计算缩放比
110.int be = (int)(options.outHeight / (float)200);
111.if (be <= 0)
112.be = 1;
113.options.inSampleSize = 2; // 图片长宽各缩小二分之一
114.// 重新读入图片，注意这次要把options.inJustDecodeBounds 设为 false哦
115.bitmap = BitmapFactory.decodeFile(path, options);
116.int w = bitmap.getWidth();
117.int h = bitmap.getHeight();
118.System.out.println(w + " " + h);
119.// savePNG_After(bitmap,path);
120.saveJPGE_After(bitmap, path);
121.}
122./**
123.* 保存图片为PNG
124.*
125.* @param bitmap
126.* @param name
127.*/
128.public static void savePNG_After(Bitmap bitmap, String name) {
129.File file = new File(name);
130.try {
131.FileOutputStream out = new FileOutputStream(file);
132.if (bitmap.compress(Bitmap.CompressFormat.PNG, 100, out)) {
133.out.flush();
134.out.close();
135.}
136.} catch (FileNotFoundException e) {
137.e.printStackTrace();
138.} catch (IOException e) {
139.e.printStackTrace();
140.}
141.}
142./**
143.* 保存图片为JPEG
144.*
145.* @param bitmap
146.* @param path
147.*/
148.public static void saveJPGE_After(Bitmap bitmap, String path) {
149.File file = new File(path);
150.try {
151.FileOutputStream out = new FileOutputStream(file);
152.if (bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out)) {
153.out.flush();
154.out.close();
155.}
156.} catch (FileNotFoundException e) {
157.e.printStackTrace();
158.} catch (IOException e) {
159.e.printStackTrace();
160.}
161.}
162./**
163.* 水印
164.*
165.* @param bitmap
166.* @return
167.*/
168.public static Bitmap createBitmapForWatermark(Bitmap src, Bitmap watermark) {
169.if (src == null) {
170.return null;
171.}
172.int w = src.getWidth();
173.int h = src.getHeight();
174.int ww = watermark.getWidth();
175.int wh = watermark.getHeight();
176.// create the new blank bitmap
177.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
178.Canvas cv = new Canvas(newb);
179.// draw src into
180.cv.drawBitmap(src, 0, 0, null);// 在 0，0坐标开始画入src
181.// draw watermark into
182.cv.drawBitmap(watermark, w - ww + 5, h - wh + 5, null);// 在src的右下角画入水印
183.// save all clip
184.cv.save(Canvas.ALL_SAVE_FLAG);// 保存
185.// store
186.cv.restore();// 存储
187.return newb;
188.}
189./**
190.* 图片合成
191.*
192.* @return
193.*/
194.public static Bitmap potoMix(int direction, Bitmap... bitmaps) {
195.if (bitmaps.length <= 0) {
196.return null;
197.}
198.if (bitmaps.length == 1) {
199.return bitmaps[0];
200.}
201.Bitmap newBitmap = bitmaps[0];
202.// newBitmap = createBitmapForFotoMix(bitmaps[0],bitmaps[1],direction);
203.for (int i = 1; i < bitmaps.length; i++) {
204.newBitmap = createBitmapForFotoMix(newBitmap, bitmaps[i], direction);
205.}
206.return newBitmap;
207.}
208.
209.private static Bitmap createBitmapForFotoMix(Bitmap first, Bitmap second, int direction) {
210.if (first == null) {
211.return null;
212.}
213.if (second == null) {
214.return first;
215.}
216.int fw = first.getWidth();
217.int fh = first.getHeight();
218.int sw = second.getWidth();
219.int sh = second.getHeight();
220.Bitmap newBitmap = null;
221.if (direction == LEFT) {
222.newBitmap = Bitmap.createBitmap(fw + sw, fh > sh ? fh : sh, Config.ARGB_8888);
223.Canvas canvas = new Canvas(newBitmap);
224.canvas.drawBitmap(first, sw, 0, null);
225.canvas.drawBitmap(second, 0, 0, null);
226.} else if (direction == RIGHT) {
227.newBitmap = Bitmap.createBitmap(fw + sw, fh > sh ? fh : sh, Config.ARGB_8888);
228.Canvas canvas = new Canvas(newBitmap);
229.canvas.drawBitmap(first, 0, 0, null);
230.canvas.drawBitmap(second, fw, 0, null);
231.} else if (direction == TOP) {
232.newBitmap = Bitmap.createBitmap(sw > fw ? sw : fw, fh + sh, Config.ARGB_8888);
233.Canvas canvas = new Canvas(newBitmap);
234.canvas.drawBitmap(first, 0, sh, null);
235.canvas.drawBitmap(second, 0, 0, null);
236.} else if (direction == BOTTOM) {
237.newBitmap = Bitmap.createBitmap(sw > fw ? sw : fw, fh + sh, Config.ARGB_8888);
238.Canvas canvas = new Canvas(newBitmap);
239.canvas.drawBitmap(first, 0, 0, null);
240.canvas.drawBitmap(second, 0, fh, null);
241.}
242.return newBitmap;
243.}
244./**
245.* 将Bitmap转换成指定大小
246.* @param bitmap
247.* @param width
248.* @param height
249.* @return
250.*/
251.public static Bitmap createBitmapBySize(Bitmap bitmap,int width,int height)
252.{
253.return Bitmap.createScaledBitmap(bitmap, width, height, true);
254.}
255./**
256.* Drawable 转 Bitmap
257.*
258.* @param drawable
259.* @return
260.*/
261.public static Bitmap drawableToBitmapByBD(Drawable drawable) {
262.BitmapDrawable bitmapDrawable = (BitmapDrawable)drawable;
263.return bitmapDrawable.getBitmap();
264.}
265./**
266.* Bitmap 转 Drawable
267.*
268.* @param bitmap
269.* @return
270.*/
271.public static Drawable bitmapToDrawableByBD(Bitmap bitmap) {
272.Drawable drawable = new BitmapDrawable(bitmap);
273.return drawable;
274.}
275./**
276.* byte[] 转 bitmap
277.*
278.* @param b
279.* @return
280.*/
281.public static Bitmap bytesToBimap(byte[] b) {
282.if (b.length != 0) {
283.return BitmapFactory.decodeByteArray(b, 0, b.length);
284.} else {
285.return null;
286.}
287.}
288./**
289.* bitmap 转 byte[]
290.*
291.* @param bm
292.* @return
293.*/
294.public static byte[] bitmapToBytes(Bitmap bm) {
295.ByteArrayOutputStream baos = new ByteArrayOutputStream();
296.bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
297.return baos.toByteArray();
298.}
299.}