public void takePic(){

        String forderPath =  getExternalFilesDir("")  + "/pic";

        File file = new File(forderPath);

        if (!file.exists()){

            file.mkdirs();

        }

        String randomNum = DateTools.getCurrentData_yyyyMMddHHmmss();

        //创建File对象，用于存储拍照后的照片

        File outputImage = new File(forderPath,randomNum + "_output_image.jpg");

        currentImagPath = outputImage.getAbsolutePath();

        try {

            if (outputImage.exists()){

                outputImage.delete();

            }

            outputImage.createNewFile();

        }catch (IOException e){

            e.printStackTrace();

        }

        if (Build.VERSION.SDK_INT >= 24){

            imageUri = FileProvider.getUriForFile(context,"xxxxxx.packagename",outputImage);

        }else {

            imageUri = Uri.fromFile(outputImage);

        }

        //启动相机程序

        Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");

        intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);

        startActivityForResult(intent,TAKE_PHOTO);

    }

 @Override

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        switch (requestCode){

            case TAKE_PHOTO:

                if (resultCode == RESULT_OK){

//                    String mimgUri =  imageUri.toString();

//                    String path = imageUri.getPath();

                    String path  = getProviderUriPath(imageUri);

                    Uri uri = Uri.parse(path);

                    mUploadMessage.onReceiveValue(uri);

                }

                break;

    }

}