假设您的问题是关于先将文本和图像上传到firebase的Firestore中，您需要将图像上传到firebase存储并获取下载URI

    // Create a storage reference from our app
   StorageReference storageRef = storage.getReference();
   Uri file = Uri.fromFile(new File(IMAGE PATH));
   final StorageReference riversRef = storageRef.child("images/"+file.getLastPathSegment());
uploadTask = ref.putFile(file);

Task<Uri> urlTask = uploadTask.continueWithTask(new Continuation<UploadTask.TaskSnapshot, Task<Uri>>() {
    @Override
    public Task<Uri> then(@NonNull Task<UploadTask.TaskSnapshot> task) throws Exception {
        if (!task.isSuccessful()) {
            throw task.getException();
        }

        // Continue with the task to get the download URL
        return ref.getDownloadUrl();
    }
}).addOnCompleteListener(new OnCompleteListener<Uri>() {
    @Override
    public void onComplete(@NonNull Task<Uri> task) {
        if (task.isSuccessful()) {
            Uri downloadUri = task.getResult();
             // TODO NEXT PART 
        } else {
            // Handle failures
            // ...
        }
    }
});

在获得下载uri之后，将uri和textView都上传到Firestore，如下所示

Map<String, String> post = new HashMap<>();
user.put("text", myPostEditText.getText().toString());
user.put("image", downloadUri);

FirebaseFirestore db = FirebaseFirestore.getInstance();
// Add a new document with a generated ID
db.collection("posts")
        .add(post)

所以保存上传的最后代码应该是这样的

     // Create a storage reference from our app
     StorageReference storageRef = storage.getReference();
     Uri file = Uri.fromFile(new File(IMAGE PATH));
        final StorageReference riversRef = storageRef.child("images/"+file.getLastPathSegment());
        uploadTask = ref.putFile(file);

        Task<Uri> urlTask = uploadTask.continueWithTask(new Continuation<UploadTask.TaskSnapshot, Task<Uri>>() {
            @Override
            public Task<Uri> then(@NonNull Task<UploadTask.TaskSnapshot> task) throws Exception {
                if (!task.isSuccessful()) {
                    throw task.getException();
                }

                // Continue with the task to get the download URL
                return ref.getDownloadUrl();
            }
        }).addOnCompleteListener(new OnCompleteListener<Uri>() {
            @Override
            public void onComplete(@NonNull Task<Uri> task) {
                if (task.isSuccessful()) {
                    Uri downloadUri = task.getResult();
                    Map<String, String> post = new HashMap<>();
                    user.put("text", myPostEditText.getText().toString());
                    user.put("image", downloadUri);

                    FirebaseFirestore db = FirebaseFirestore.getInstance();
// Add a new document with a generated ID
                    db.collection("posts")
                            .add(post).addOnSuccessListener(new OnSuccessListener<DocumentReference>() {
                        @Override
                        public void onSuccess(DocumentReference documentReference) {
                            Toast.makeText(MainActivity.this, "Uploaded successfully", Toast.LENGTH_SHORT).show();
                            Log.d(TAG, "DocumentSnapshot added with ID: " + documentReference.getId());
                        }
                    })
                            .addOnFailureListener(new OnFailureListener() {
                                @Override
                                public void onFailure(@NonNull Exception e) {
                                    Log.w(TAG, "Error adding document", e);
                                }
                            });
                } else {
                    // Handle failures
                    // ...
                }
            }
        });