public void getBitmap(String imgPath, String outPath) {  
        BitmapFactory.Options newOpts = new BitmapFactory.Options();  
        newOpts.inJustDecodeBounds = false;  
        newOpts.inPurgeable = true;  
        newOpts.inInputShareable = true;  
        // Do not compress  
        newOpts.inSampleSize = 1;  
        newOpts.inPreferredConfig = Config.RGB_565;  
        storeImage(bitmap, outPath); //保存圖片
    }

/**
     * 把bitmap轉(zhuǎn)化成圖片存儲(chǔ)在本地
     *
     * @param bitmap
     * @param outPath 本地的存儲(chǔ)路徑
     * @throws FileNotFoundException
     */
    public static boolean storeImage(Bitmap bitmap, String outPath) throws FileNotFoundException {
        FileOutputStream os = new FileOutputStream(outPath);
        boolean compressResult = bitmap.compress(Bitmap.CompressFormat.JPEG, 100, os);
        return compressResult;
    }

/**
     * 按比例壓縮
     *
     * @param path    原圖片路徑
     * @param targetW 壓縮后寬度
     * @param targetH 壓縮后高度
     * @return 壓縮后的圖片的保存路徑
     */
    public static String compressScale(String path,, String outPath, int targetW, int targetH) throws FileNotFoundException {
        // 獲取option  
        BitmapFactory.Options options = new BitmapFactory.Options();
        // inJustDecodeBounds設(shè)置為true,這樣使用該option decode出來的Bitmap是null，  
        // 只是把長寬存放到option中  
        options.inJustDecodeBounds = true;
        // 此時(shí)bitmap為null  
        Bitmap bitmap = BitmapFactory.decodeFile(path, options);
        int inSampleSize = 1; // 1是不縮放  
        // 計(jì)算寬高縮放比例  
        int inSampleSizeW = options.outWidth / targetW;
        int inSampleSizeH = options.outHeight / targetH;
        // 最終取大的那個(gè)為縮放比例，這樣才能適配，例如寬縮放3倍才能適配屏幕，而  
        // 高不縮放就可以，那樣的話如果按高縮放，寬在屏幕內(nèi)就顯示不下了  
        if (inSampleSizeW > inSampleSizeH) {
            inSampleSize = inSampleSizeW;
        } else {
            inSampleSize = inSampleSizeH;
        }
        // 一定要記得將inJustDecodeBounds設(shè)為false，否則Bitmap為null  
        options.inJustDecodeBounds = false;
        // 設(shè)置縮放比例(采樣率)  
        options.inSampleSize = inSampleSize;
        bitmap = BitmapFactory.decodeFile(path, options);
        boolean isSuccess = storeImage(bitmap, outPath);
        if (isSuccess) {
            return outPath;
        }
        return "";
    }

/**
     * 獲取本地文件大小
     *
     * @param imgPath 圖片的路徑
     * @return 圖片實(shí)際的大小，單位byte
     */
    public static int getFileSize(String imgPath) {
        int size = 0;
        try {
            FileInputStream fis = new FileInputStream(new File(imgPath));
            size = fis.available();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return size;
    }

compile 'top.zibin:Luban:1.1.3'

private void lunBanPress(String path) {
        String pressPath = Environment.getExternalStorageDirectory().getPath();
        Luban.with(this)
                .load(path)                                   // 傳人要壓縮的圖片列表
                .ignoreBy(100)                                  // 忽略不壓縮圖片的大小
                .setTargetDir(pressPath)                        // 設(shè)置壓縮后文件存儲(chǔ)位置
                .setCompressListener(new OnCompressListener() { //設(shè)置回調(diào)
                    @Override
                    public void onStart() {
                        // TODO 壓縮開始前調(diào)用，可以在方法內(nèi)啟動(dòng) loading UI
                        Log.i(TAG, "onStart:開始魯班壓縮 ");
                    }

                    @Override
                    public void onSuccess(File file) {
                        // TODO 壓縮成功后調(diào)用，返回壓縮后的圖片文件
                        Glide.with(activity).load(file).into(iv2);
                        Log.i(TAG, "onSuccess: 魯班壓縮成功 ：");
                        try {
                            int size = new FileInputStream(file).available();
                            Log.i("tag", "魯班壓縮 size--->:" + "byte:" + size + "    kb:"
                                    + (float) size / 1024);
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }

                    @Override
                    public void onError(Throwable e) {
                        // TODO 當(dāng)壓縮過程出現(xiàn)問題時(shí)調(diào)用
                        Log.i(TAG, "onError: 魯班壓縮出錯(cuò)");
                    }
                }).launch();    //啟動(dòng)壓縮
    }