Android之小小图片加工厂

有时候我们在项目中，需要把图片加工一下，比如说加个圆角，或者打上马赛克或者水印，虽然不是很难的东西，但是没弄过，还是很纠结的，比如像我这样的小白，现在根据网上一些大牛的一些方法，总结了下面这个图片加工厂工具类，可能还有更多的需求，有需要的时候，再去网上找，继续完善中，，直接上跟大家分享代码，注释比较多，而且简单，我就不多说了，直接上跟大家分享代码：

/** * 图片加工厂 *  * @author way *  */public class ImageUtil {/** * 通过路径获取输入流 *  * @param path *            路径 * @return 输入流 * @throws Exception *             异常 */public static InputStream getRequest(String path) throws Exception {URL url = new URL(path);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("GET");conn.setConnectTimeout(5000);if (conn.getResponseCode() == 200) {return conn.getInputStream();}return null;}/** * 从流中读取二进制数据 *  * @param inStream *            输入流 * @return 二进制数据 * @throws Exception *             异常 */public static byte[] readInputStream(InputStream inStream) throws Exception {ByteArrayOutputStream outSteam = new ByteArrayOutputStream();byte[] buffer = new byte[4096];int len = 0;while ((len = inStream.read(buffer)) != -1) {outSteam.write(buffer, 0, len);}outSteam.close();inStream.close();return outSteam.toByteArray();}/** * 把一个路径转换成Drawable对象 *  * @param url *            路径 * @return Drawable对象 */public static Drawable loadImageFromUrl(String url) {URL m;InputStream i = null;try {m = new URL(url);i = (InputStream) m.getContent();} catch (MalformedURLException e1) {e1.printStackTrace();} catch (IOException e) {e.printStackTrace();}Drawable d = Drawable.createFromStream(i, "src");return d;}/** * 把一个路径转换成Drawable对象 *  * @param url *            字符串路径 * @return Drawable对象 * @throws Exception *             异常 */public static Drawable getDrawableFromUrl(String url) throws Exception {return Drawable.createFromStream(getRequest(url), null);}/** * 从路径中得到位图 *  * @param url *            字符串路径 * @return 位图 * @throws Exception *             异常 */public static Bitmap getBitmapFromUrl(String url) throws Exception {byte[] bytes = getBytesFromUrl(url);return byteToBitmap(bytes);}/** * 从路径中得到圆角位图 *  * @param url *            字符串路径 * @param pixels *            圆角弧度 * @return 圆角位图 * @throws Exception *             异常 */public static Bitmap getRoundBitmapFromUrl(String url, int pixels)throws Exception {byte[] bytes = getBytesFromUrl(url);Bitmap bitmap = byteToBitmap(bytes);return toRoundCorner(bitmap, pixels);}/** * 从路径中得到圆角Drawable对象 *  * @param url *            字符串路径 * @param pixels *            圆角弧度 * @return 圆角Drawable对象 * @throws Exception *             异常 */public static Drawable geRoundDrawableFromUrl(String url, int pixels)throws Exception {byte[] bytes = getBytesFromUrl(url);BitmapDrawable bitmapDrawable = (BitmapDrawable) byteToDrawable(bytes);return toRoundCorner(bitmapDrawable, pixels);}/** * 从路径中得到二进制数据 *  * @param url *            字符串路径 * @return 二进制数据 * @throws Exception *             异常 */public static byte[] getBytesFromUrl(String url) throws Exception {return readInputStream(getRequest(url));}/** * 从二进制数据中得到位图 *  * @param byteArray *            二进制数据 * @return 位图 */public static Bitmap byteToBitmap(byte[] byteArray) {if (byteArray.length != 0) {return BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);} else {return null;}}/** * 从二进制数据中得到Drawable对象 *  * @param byteArray *            二进制数据 * @return Drawable对象 */public static Drawable byteToDrawable(byte[] byteArray) {ByteArrayInputStream ins = new ByteArrayInputStream(byteArray);return Drawable.createFromStream(ins, null);}/** * 把位图转换称二进制数据 *  * @param bm *            位图 * @return 二进制数据 */public static byte[] Bitmap2Bytes(Bitmap bm) {ByteArrayOutputStream baos = new ByteArrayOutputStream();bm.compress(Bitmap.CompressFormat.PNG, 100, baos);return baos.toByteArray();}/** * 把Drawable对象转换称位图 *  * @param drawable *            Drawable对象 * @return 位图 */public static Bitmap drawableToBitmap(Drawable drawable) {Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight(),drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888: Bitmap.Config.RGB_565);Canvas canvas = new Canvas(bitmap);drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight());drawable.draw(canvas);return bitmap;}/** * 图片去色,返回灰度图片 *  * @param bmpOriginal *            传入的图片 * @return 去色后的图片 */public static Bitmap toGrayscale(Bitmap bmpOriginal) {int width, height;height = bmpOriginal.getHeight();width = bmpOriginal.getWidth();Bitmap bmpGrayscale = Bitmap.createBitmap(width, height,Bitmap.Config.RGB_565);Canvas c = new Canvas(bmpGrayscale);Paint paint = new Paint();ColorMatrix cm = new ColorMatrix();cm.setSaturation(0);ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);paint.setColorFilter(f);c.drawBitmap(bmpOriginal, 0, 0, paint);return bmpGrayscale;}/** * 去色同时加圆角 *  * @param bmpOriginal *            原图 * @param pixels *            圆角弧度 * @return 修改后的图片 */public static Bitmap toGrayscale(Bitmap bmpOriginal, int pixels) {return toRoundCorner(toGrayscale(bmpOriginal), pixels);}/** * 把位图变成圆角位图 *  * @param bitmap *            需要修改的位图 * @param pixels *            圆角的弧度 * @return 圆角位图 */public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),bitmap.getHeight(), Config.ARGB_8888);Canvas canvas = new Canvas(output);final int color = 0xff424242;final Paint paint = new Paint();final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());final RectF rectF = new RectF(rect);final float roundPx = pixels;paint.setAntiAlias(true);canvas.drawARGB(0, 0, 0, 0);paint.setColor(color);canvas.drawRoundRect(rectF, roundPx, roundPx, paint);paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));canvas.drawBitmap(bitmap, rect, rect, paint);return output;}/** * 将BitampDrawable转换成圆角的BitampDrawable *  * @param bitmapDrawable *            原生BitampDrawable对象 * @param pixels *            圆角弧度 * @return 圆角BitampDrawable对象 */public static BitmapDrawable toRoundCorner(BitmapDrawable bitmapDrawable,int pixels) {Bitmap bitmap = bitmapDrawable.getBitmap();bitmapDrawable = new BitmapDrawable(toRoundCorner(bitmap, pixels));return bitmapDrawable;}/** * 图片水印生成的方法 *  * @param src *            源图片位图 * @param watermark *            水印图片位图 * @return 返回一个加了水印的图片 */public static Bitmap createBitmap(Bitmap src, Bitmap watermark) {if (src == null)return null;int w = src.getWidth();int h = src.getHeight();int ww = watermark.getWidth();int wh = watermark.getHeight();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Canvas cv = new Canvas(newb);// 初始化画布cv.drawBitmap(src, 0, 0, null);// 在 0，0坐标开始画入srccv.drawBitmap(watermark, w - ww + 5, h - wh + 5, null);// 在src的右下角画入水印cv.save(Canvas.ALL_SAVE_FLAG);// 保存，用来保存Canvas的状态。save之后，可以调用Canvas的平移、放缩、旋转、错切、裁剪等操作。cv.restore();// 存储，用来恢复Canvas之前保存的状态。防止save后对Canvas执行的操作对后续的绘制有影响。return newb;}}

来源：http://blog.csdn.net/weidi1989/article/details/8088309