如何选择多个图像并立即将它们发送到firebase数据库

Question

我想创建一个Android电子商务应用程序，允许用户上传多个图像并将其保存在firebase中。但我似乎找不到任何有用的教程如何做到这一点。请帮助您提供示例代码。

这是我在onActivityResult中的代码：

    switch (requestCode) {
        case 0:
            if (resultCode == RESULT_OK) {

              mImageUri = data.getData();
                activity(mImageUri)
                        .setGuidelines(CropImageView.Guidelines.ON)
                        .start(this);
              mSelectImage.setImageURI(mImageUri);


            }


            break;

        case 1:
            if(resultCode == RESULT_OK){
                mImageUri = data.getData();
                activity(mImageUri)
                        .setGuidelines(CropImageView.Guidelines.ON)
                        .start(this);
                mSelectImage.setImageURI(mImageUri);

            }
            break;
    }


    if (requestCode == CROP_IMAGE_ACTIVITY_REQUEST_CODE) {
        ActivityResult result = getActivityResult(data);
        if (resultCode == RESULT_OK) {

            mImageUri = result.getUri();

            mSelectImage.setImageURI(mImageUri);

        } else if (resultCode == CROP_IMAGE_ACTIVITY_RESULT_ERROR_CODE) {
            Exception error = result.getError();
        }
    }
}



private void selectImage() {

    final CharSequence[] items = {"Take Photo", "Choose from Library",
            "Cancel"};


    AlertDialog.Builder builder = new AlertDialog.Builder(
            PostActivity.this);


    builder.setTitle("Add Photo");
    builder.setItems(items, new DialogInterface.OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog, int item) {
            if (items[item].equals("Take Photo")) {
                Intent takePicture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                if (takePicture.resolveActivity(getPackageManager()) != null) {
                    startActivityForResult(takePicture, 0);}

            } else if (items[item].equals("Choose from Library")) {
                Intent pickPhoto = new Intent(Intent.ACTION_PICK,
                        android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                startActivityForResult(pickPhoto , 1);
            } else if (items[item].equals("Cancel")) {
                dialog.dismiss();
            }
        }
    });
    builder.show();

}`

图库请求工作正常，但拍照后相机请求崩溃了。我可以添加或删除什么？

请注意我正在使用theartofdev cropping