Android图片处理工具类（圆角，压缩）工作中用到的图片处理工具类，简单写下来，以便备用！public class BitmapUtils {/*** 图像背景圆角处理* bitmap要处理的图片 roundPx 图片弯角的圆度一般是5到10之间*/public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {// 创建与原图大小一样的bitmap文件，Config.ARGB_8888根据情况可以改用其它的Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);// 实例画布，绘制的bitmap将保存至output中Canvas canvas = new Canvas(output);final int color = 0xff424242;//写自己需要的颜色值final Paint paint = new Paint();final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());final RectF rectF = new RectF(rect);paint.setAntiAlias(true);canvas.drawARGB(0, 0, 0, 0);paint.setColor(color);canvas.drawRoundRect(rectF, roundPx, roundPx, paint);paint.setXfermode(newPorterDuffXfermode(android.graphics.PorterDuff.Mode.SRC_IN)); canvas.drawBitmap(bitmap, rect, rect, paint);bitmap.recycle();bitmap = null;return output;}/*** bitmap缩放* width要缩放的宽度 height要缩放的高度*/public static Bitmap getBitmapDeflation(Bitmap bitmap, int width, int height, boolean recycle) {if (null == bitmap) {return null;}float scaleWidth = 0f;float scaleHeight = 0f;// 获取bitmap宽高int bitmapWidth = bitmap.getWidth();int bitmapHeight = bitmap.getHeight();// 计算缩放比,图片的宽高小于指定的宽高则不缩放if (width < bitmapWidth) {scaleWidth = ((float) width) / bitmapWidth;} else {scaleWidth = 1.00f;}if (height < bitmapHeight) {scaleHeight = ((float) height) / bitmapHeight; } else {scaleHeight = 1.00f;}Matrix matrix = new Matrix();matrix.postScale(scaleWidth, scaleHeight);Bitmap newBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmapWidth, bitmapHeight, matrix, true);if (recycle && !bitmap.isRecycled()) {bitmap.recycle();}bitmap = null;return newBitmap;}/**** 方法概述：进入图片的大小与质量压缩，用于区分大小图片*/public static Bitmap getCompressedImage(String srcPath) {BitmapFactory.Options newOpts = new BitmapFactory.Options();// 开始读入图片，此时把options.inJustDecodeBounds 设回true了 newOpts.inPreferredConfig = Bitmap.Config.RGB_565;newOpts.inPurgeable = true;newOpts.inJustDecodeBounds = true;FileInputStream is = null;try {is = new FileInputStream(srcPath);} catch (FileNotFoundException e) {e.printStackTrace();}Bitmap bitmap = BitmapFactory.decodeStream(is, null, newOpts);// 此时返回bm为空newOpts.inJustDecodeBounds = false;int w = newOpts.outWidth;int h = newOpts.outHeight;// 现在主流手机比较多是800*480分辨率，所以高和宽我们设置为float hh = 130f;// 这里设置高度为800ffloat ww = 130f;// 这里设置宽度为480f// 缩放比。

由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可int be = 1;// be=1表示不缩放if (w > h && w > ww) {// 如果宽度大的话根据宽度固定大小缩放be = (int) (newOpts.outWidth / ww);} else if (w < h && h > hh) {// 如果高度高的话根据宽度固定大小缩放be = (int) (newOpts.outHeight / hh);}if (be <= 0) {be = 1;}newOpts.inSampleSize = be;// 设置缩放比例// 重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了bitmap = BitmapFactory.decodeFile(srcPath, newOpts);if (bitmap != null) { return compressImageSize(bitmap, 8);// 压缩好比例大小后再进行质量压缩}return null;}/**** 方法概述：图片质量压缩*/protected static Bitmap compressImageSize(Bitmap image, int size) {if (image == null)return image;ByteArrayOutputStream baos = new ByteArrayOutputStream();press(pressFormat.JPEG, 100, baos);// 质量压缩方法，这里10表示不压缩，把压缩后的数据存放到baos中int options = 100;while(baos.toByteArray().length / 1000> size && options / 3> 0) { // 循环判断如果压缩后图片是否大于10kb,大于继续压缩baos.reset();// 重置baos即清空baospress(pressFormat.JPEG, options, baos);// 这里压缩options%，把压缩后的数据存放到baos中options -= options / 3;// 每次都减少30%}ByteArrayInputStream isBm = newByteArrayInputStream(baos.toByteArray());// 把压缩后的数据baos存放到ByteArrayInputStream中Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);// 把ByteArrayInputStream数据生成图片return bitmap;}/**** 方法概述：保存图片*/public static String saveBitmapWithName(String path, String bitName, Bitmap mBitmap) {File f = new File(path + bitName + ".png");String url = path + bitName + ".png";try {f.createNewFile();} catch (IOException e) {System.out.println("文件创建出错");}FileOutputStream fOut = null;try {fOut = new FileOutputStream(f);} catch (FileNotFoundException e) {System.out.println(" 创建文件流失败");e.printStackTrace();}press(pressFormat.PNG, 100, fOut);try {fOut.flush();} catch (IOException e) {e.printStackTrace();}try {fOut.close();} catch (IOException e) {e.printStackTrace();}return url;}/**** 方法概述：根据传入参数保存图片*/public static boolean saveImageTo(Bitmap photo, String spath) { try {BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(spath, false));press(pressFormat.PNG, 100, bos);bos.flush();bos.close();} catch (Exception e) {e.printStackTrace();return false;}return true;}}</pre>。