/** * 质量压缩方法 * * @param image * @return */ private static Bitmap compressImage(Bitmap image) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); image.compress(Bitmap.CompressFormat.JPEG, 100, baos); int options = 100; while (baos.toByteArray().length / 1024 > 100) { baos.reset(); image.compress(Bitmap.CompressFormat.JPEG, options, baos); options -= 10; } ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray()); Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null); return bitmap; } /** * 图片按比例大小压缩方法(根据路径获取图片并压缩) * * @param srcPath * @return */ private static Bitmap getImage(String srcPath) { BitmapFactory.Options newOpts = new BitmapFactory.Options(); newOpts.inJustDecodeBounds = true; Bitmap bitmap = BitmapFactory.decodeFile(srcPath, 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 = 800f;// 这里设置高度为800f float ww = 480f;// 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); return compressImage(bitmap);// 压缩好比例大小后再进行质量压缩 } /** * 将压缩的bitmap保存到SDCard卡临时文件夹,用于上传 * * @param filename * @param bit * @return */ private static String saveMyBitmap(String filename, Bitmap bit) { String baseDir = Environment.getExternalStorageDirectory().getAbsolutePath() + "/chdd/"; String filePath = baseDir + filename; File dir = new File(baseDir); if (!dir.exists()) { dir.mkdir(); } File f = new File(filePath); try { f.createNewFile(); FileOutputStream fOut = null; fOut = new FileOutputStream(f); bit.compress(Bitmap.CompressFormat.PNG, 100, fOut); fOut.flush(); fOut.close(); } catch (IOException e1) { e1.printStackTrace(); } return filePath; } /** * 压缩上传路径 * * @param path * @return */ public static String compressImageUpload(String path) { String filename = path.substring(path.lastIndexOf("/") + 1); Bitmap image = getImage(path); return saveMyBitmap(filename, image); } /** * 清除缓存文件 */ public static void deleteCacheFile() { File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/chdd/"); RecursionDeleteFile(file); } /** * 递归删除 */ private static void RecursionDeleteFile(File file) { if (file.isFile()) { file.delete(); return; } if (file.isDirectory()) { File[] childFile = file.listFiles(); if (childFile == null || childFile.length == 0) { file.delete(); return; } for (File f : childFile) { RecursionDeleteFile(f); } file.delete(); } } 用法 //上传文件 public void postFileRequest(String url, Map<String, String> params, ArrayList<ImageItem> pathList, MyStringCallBack callback) { Map<String, File> files = new HashMap<>(); for (int i = 0; i < pathList.size(); i++) { String newPath = BitmapUtils.compressImageUpload(pathList.get(i).path); files.put(pathList.get(i).name+i,new File(newPath)); } mPost.url(url) .files("files",files) .build() .execute(callback); }