Question

我要将6张图片上传到Firebase存储，并将图片路径和一些数据保存在Firebase数据库中。到目前为止，仅上传全部6张图像时，该功能仍然有效。

我是BSimagePicker库https://github.com/siralam/BSImagePicker，用于选择多个图像，然后将其上传到存储并在数据库中保存路径。

我遇到的问题是，如果我要上传少于6张图像，则会崩溃，并指出我指向的PUTFILE为空。我如何确定如果uri为null则可以上传吗？

此外，我处理路径上传的最佳方式是什么？

我找不到有关上传多个文件并将其路径保存到实时数据库的教程。全部只有一个文件。

private void startPosting() {

    mPost.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.d(ImageLoader.TAG, "onClick: attempting to post...");
            if (!isEmpty(mTitle.getText().toString())
                    && !isEmpty(mDescription.getText().toString())
                    && !isEmpty(mPrice.getText().toString())
                    && !isEmpty(mCountry.getText().toString())
                    && !isEmpty(mStateProvince.getText().toString())
                    && !isEmpty(mCity.getText().toString())
                    && !isEmpty(mContactEmail.getText().toString())) {

                if (mAllUri != null ) {

                    Toast.makeText(getActivity(), "uploading image", Toast.LENGTH_SHORT).show();

                    final String postId = FirebaseDatabase.getInstance().getReference().push().getKey();

                    StorageReference filepath = FirebaseStorage.getInstance().getReference()
                            .child("posts/users/" + FirebaseAuth.getInstance().getCurrentUser().getUid() +
                                    "/" + postId + "/post_image");

                    final StorageReference filepath1 = FirebaseStorage.getInstance().getReference()
                            .child("posts/users/" + FirebaseAuth.getInstance().getCurrentUser().getUid() +
                                    "/" + postId + "/post_image1");
                    final StorageReference filepath2 = FirebaseStorage.getInstance().getReference()
                            .child("posts/users/" + FirebaseAuth.getInstance().getCurrentUser().getUid() +
                                    "/" + postId + "/post_image2");
                    final StorageReference filepath3 = FirebaseStorage.getInstance().getReference()
                            .child("posts/users/" + FirebaseAuth.getInstance().getCurrentUser().getUid() +
                                    "/" + postId + "/post_image3");
                    final StorageReference filepath4 = FirebaseStorage.getInstance().getReference()
                            .child("posts/users/" + FirebaseAuth.getInstance().getCurrentUser().getUid() +
                                    "/" + postId + "/post_image4");
                    final StorageReference filepath5 = FirebaseStorage.getInstance().getReference()
                            .child("posts/users/" + FirebaseAuth.getInstance().getCurrentUser().getUid() +
                                    "/" + postId + "/post_image5");

                    final Uri[] firebaseUri = new Uri[1];
                    final Uri[] firebaseUri1 = new Uri[1];
                    final Uri[] firebaseUri2 = new Uri[1];
                    final Uri[] firebaseUri3 = new Uri[1];
                    final Uri[] firebaseUri4 = new Uri[1];
                    final Uri[] firebaseUri5 = new Uri[1];


                    filepath.putFile(mSelectedUri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {

                        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {

                            firebaseUri[0] = taskSnapshot.getDownloadUrl();

                    filepath1.putFile(mSelectedUri1).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {

                        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {

                             firebaseUri1[0] = taskSnapshot.getDownloadUrl();

                    filepath2.putFile(mSelectedUri2).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {

                        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {

                             firebaseUri2[0] = taskSnapshot.getDownloadUrl();

                    filepath3.putFile(mSelectedUri3).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {

                        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {

                             firebaseUri3[0] = taskSnapshot.getDownloadUrl();

                    filepath4.putFile(mSelectedUri4).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {

                         public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {

                             firebaseUri4[0] = taskSnapshot.getDownloadUrl();

                    filepath5.putFile(mSelectedUri5).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {

                        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {

                            DatabaseReference reference = FirebaseDatabase.getInstance().getReference();

                            firebaseUri5[0] = taskSnapshot.getDownloadUrl();

                            Post post = new Post();
                            post.setCity(mCity.getText().toString());
                            post.setContact_email(mContactEmail.getText().toString());
                            post.setCountry(mCountry.getText().toString());
                            post.setDescription(mDescription.getText().toString());
                            post.setPost_id(postId);
                            post.setPrice(mPrice.getText().toString());
                            post.setState_province(mStateProvince.getText().toString());
                            post.setTitle(mTitle.getText().toString());
                            post.setUser_id(FirebaseAuth.getInstance().getCurrentUser().getUid());

                            post.setImage(firebaseUri[0].toString());
                            post.setImage1(firebaseUri1[0].toString());
                            post.setImage2(firebaseUri2[0].toString());
                            post.setImage3(firebaseUri3[0].toString());
                            post.setImage4(firebaseUri4[0].toString());
                            post.setImage5(firebaseUri5[0].toString());


                            reference.child(getString(R.string.node_posts))
                                    .child(postId)
                                    .setValue(post);
                            showProgressBar();
                            resetFields();

                        }

                    });
                        }//file4
                    });//file4
                        } //file3
                    }); //file3
                        }//file2
                    }); //file2
                        }//file1
                    });//file1
                        }
                    });
                }

           //
            }
        }

    });
}

这是检索uri的函数：

@Override
public void onMultiImageSelected(List<Uri> uriList, String tag) {
    for (int i = 0; i < uriList.size(); i++) {
        mAllUri = uriList.get(i);
        if (i >= 6) return;
        ImageView iv;
        switch (i) {
            case 0:
                iv = ivImage1;
                mSelectedUri = uriList.get(0);
                Log.d(ImageLoader.TAG, "aissa image" + mSelectedUri);

                break;
            case 1:
                iv = ivImage2;
                mSelectedUri1 = uriList.get(1);
                Log.d(ImageLoader.TAG, "aissa1 image" + mSelectedUri1);
                break;
            case 2:
                iv = ivImage3;
                mSelectedUri2 = uriList.get(2);
                break;
            case 3:
                iv = ivImage4;
                mSelectedUri3 = uriList.get(3);
                break;
            case 4:
                iv = ivImage5;
                mSelectedUri4 = uriList.get(4);
                break;
            case 5:
            default:
                iv = ivImage6;
                mSelectedUri5 = uriList.get(5);
        }
        Glide.with(this).load(uriList.get(i)).into(iv);

    }
}

完成课程： https://pastebin.com/BR6M8jC2

Answer 1

据我对您的问题的了解，您希望采用一种不会在ImageView中放入null的方法。

为此，您可以仅检查从ArrayList检索的项目是否为空，换句话说，只需在将if变量放入您的mSelectedURi变量之前就放置一个@Override public void onMultiImageSelected(List<Uri> uriList, String tag) { for (int i = 0; i < uriList.size(); i++) { mAllUri = uriList.get(i); if (i >= 6) return; ImageView iv; switch (i) { case 1: iv = ivImage2; if(uriList.get(1)!=null && !uriList.get(1).equals("")){ mSelectedUri1 = uriList.get(1); Log.d(ImageLoader.TAG, "aissa1 image" + mSelectedUri1); } else // do something when it is null, like displaying a toast or something break; case 2: // do this for all these cases } }语句。

因此，您最后输入的代码应如下所示：

if($query_run = mysqli_query($link, $query)) {
    // This gets you one row at a time, use a while if there are multiple rows
    // while($row = mysqli_fetch_assoc($query_run)){}
    $row = mysqli_fetch_assoc($query_run);
    $count = $row['count'];
    // Do whatever with $count
}

将多个图像路径保存到实时数据库Firebase

1 个答案: