/**
     * 设定拍照返回的图片路径
     * @param image 图片路径
     * @param i 约定值
     */
    protected void image(String image, int i) {
        //创建file对象，用于存储拍照后的图片，这也是拍照成功后的照片路径
        outputImage = new File(getExternalCacheDir(),image);
        try {
            //判断文件是否存在，存在删除，不存在创建
            if (outputImage.exists()){
                outputImage.delete();
            }
            outputImage.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
        //相机拍照返回图片路径
        Uri photoUri;
        //判断当前Android版本
        if(Build.VERSION.SDK_INT>=24){
            photoUri = FileProvider.getUriForFile(TextActivity.this,"包名.FileProvider",outputImage);
        }else {
            photoUri = Uri.fromFile(outputImage);
        }
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);
        startActivityForResult(intent, i);
    }

/**
     * 压缩图片的方法
     * @param url
     * @param width
     * @param height
     * @return
 */
    public static Bitmap getBitmapFromUrl(String url, double width, double height) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true; // 设置了此属性一定要记得将值设置为false
        Bitmap bitmap = BitmapFactory.decodeFile(url);
        // 防止OOM发生
        options.inJustDecodeBounds = false;
        int mWidth = bitmap.getWidth();
        int mHeight = bitmap.getHeight();
        Matrix matrix = new Matrix();
        float scaleWidth = 1;
        float scaleHeight = 1;
        // 按照固定宽高进行缩放
        if(mWidth <= mHeight) {
            scaleWidth = (float) (width/mWidth);
            scaleHeight = (float) (height/mHeight);
        } else {
            scaleWidth = (float) (height/mWidth);
            scaleHeight = (float) (width/mHeight);
        }
        // 按照固定大小对图片进行缩放
        matrix.postScale(scaleWidth, scaleHeight);
        Bitmap newBitmap = Bitmap.createBitmap(bitmap, 0, 0, mWidth, mHeight, matrix, true);
        // 用完了记得回收
        bitmap.recycle();
        return newBitmap;
    }

    /**
     * Android保存Bitmap到文件
     * @param bitmap
     * @param file
     * @return
     */
    public static boolean saveBitmap(Bitmap bitmap, File file) {
        if (bitmap == null)
            return false;
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(file);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            return true;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return false;
    }

    /**
     * 旋转图片
     * @param bitmap 图片
     * @param rotate 角度
     * @return
     */
    public static Bitmap rotateBitmap(Bitmap bitmap, int rotate) {
        if (bitmap == null)
            return null;

        int w = bitmap.getWidth();
        int h = bitmap.getHeight();

        Matrix mtx = new Matrix();
        mtx.postRotate(rotate);
        return Bitmap.createBitmap(bitmap, 0, 0, w, h, mtx, true);
    }