安卓照片压缩问题

在使用相机拍摄照片时 原图在1到3m左右 但是在上传使用时 文件较大很耗时 在服务器访问时获取较慢 所以对上传图片进行了压缩 以消耗图片质量的情况下减小图片 降低了清晰度 直接上方法

对于取到的相册或拍照图片路径

oldPath

 进行处理

 //图片压缩 300k左右

    private String getThumbUploadPath(String oldPath, int bitmapMaxWidth) throws Exception {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(oldPath, options);
        int height = options.outHeight;
        int width = options.outWidth;
        int reqHeight = 0;
        int reqWidth = bitmapMaxWidth;
        reqHeight = (reqWidth * height) / width;
        // 在内存中创建bitmap对象，这个对象按照缩放大小创建的
        options.inSampleSize = calculateInSampleSize(options, bitmapMaxWidth, reqHeight);
        options.inJustDecodeBounds = false;
        Bitmap bitmap = BitmapFactory.decodeFile(oldPath, options);
        Bitmap bm = compressImage(Bitmap.createScaledBitmap(bitmap, bitmapMaxWidth, reqHeight, false));
//        saveMyBitmap(bm);
//        ByteArrayOutputStream baos = new ByteArrayOutputStream();
//        bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
        return saveMyBitmap(bm);
    }

    private int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;
        if (height > reqHeight || width > reqWidth) {
            if (width > height) {
                inSampleSize = Math.round((float) height / (float) reqHeight);
            } else {
                inSampleSize = Math.round((float) width / (float) reqWidth);
            }
        }
        return inSampleSize;
    }

    private Bitmap compressImage(Bitmap image) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        image.compress(Bitmap.CompressFormat.JPEG, 80, 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
        int options = 100;
        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
            options -= 10;// 每次都减少10
            baos.reset();// 重置baos即清空baos
            image.compress(Bitmap.CompressFormat.JPEG, options, baos);// 这里压缩options%，把压缩后的数据存放到baos中
        }
        ByteArrayInputStream isBm = new ByteArrayInputStream(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;
    }

    /**
     * 保存Bitmap到sd卡
     *
     * @param mBitmap
     * @return
     */
    public String saveMyBitmap(Bitmap mBitmap) {
        if (!checkSDcardValid() || !createDir()) {
            return "";
        }
        String currentPhotoName = System.currentTimeMillis() + ".jpg";
        File dir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/zpay/");
        File out = new File(dir, currentPhotoName);

        try {
            out.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
        FileOutputStream fOut = null;
        try {
            fOut = new FileOutputStream(out);
            mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, fOut);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        try {
            fOut.flush();
            fOut.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        Log.d(TAG, "压缩图路径：" + out.getAbsolutePath());
        return out.getAbsolutePath();
    }

经过处理后保存到新路径 图片大小在300k左右 减小上传压力

String uploadBufferpath = getThumbUploadPath(path, 480);