如何调整此代码，以便可以发送图片或文本？

Question

所以我前段时间在Android Studio中编写了此代码，现在我又回到了它来更新该应用程序。在本活动中，我可以选择一个图片，向其中写入一些文本，然后将其发布并保存到我的Firebase数据库中。但是我不能简单地写一个文本并发布它，我真的不知道现在怎么样。如果我不选择图片，只需要选择一个选项，就应该没有...

我已经四处张望了，但是什么也没找到。

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_post);

        PostImageReference = FirebaseStorage.getInstance().getReference();

        mAuth = FirebaseAuth.getInstance();
        current_user_id = mAuth.getCurrentUser().getUid();
        UsersRef = FirebaseDatabase.getInstance().getReference().child("Users");
        PostsRef = FirebaseDatabase.getInstance().getReference().child("Posts");

        SelectPostImage = (ImageButton) findViewById(R.id.select_post_image);
        UpdatePostButton = (Button) findViewById(R.id.update_post_button);
        PostDescription = (EditText) findViewById(R.id.post_description);

        UpdatePostButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ValidatePostInfo();
            }
        });
    }

    private void ValidatePostInfo() {

        Description = PostDescription.getText().toString();

        if(ImageUri==null){
            Toast.makeText(this, "Please Select a Post Image", Toast.LENGTH_SHORT).show();
        }
        else if(TextUtils.isEmpty(Description)){
            Toast.makeText(this, "Cannot post this without any text!", Toast.LENGTH_SHORT).show();
        }
        else {
            loadingBar.setTitle("Add new Post");
            loadingBar.setMessage("Please wait while post is updating...");
            loadingBar.show();
            loadingBar.setCanceledOnTouchOutside(true);
            StoringImageToFirebaseStorage();
        }
    }

    private void StoringImageToFirebaseStorage() {
        Calendar calForDate = Calendar.getInstance();
        SimpleDateFormat currentDate = new SimpleDateFormat("yyyy-MM-dd");
        saveCurrentDate = currentDate.format(calForDate.getTime());

        Calendar calForTime = Calendar.getInstance();
        SimpleDateFormat currentTime = new SimpleDateFormat("HH:mm");
        saveCurrentTime = currentTime.format(calForTime.getTime());

        postRandomName = saveCurrentDate + saveCurrentTime + current_user_id;

        final StorageReference filePath = PostImageReference.child("Post Images").child(ImageUri.getLastPathSegment() + postRandomName + ".jpg");

        filePath.putFile(ImageUri).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();
                }
                return filePath.getDownloadUrl();
            }
        }).addOnCompleteListener(new OnCompleteListener<Uri>() {
            @Override
            public void onComplete(@NonNull Task<Uri> task) {

                if(task.isSuccessful()){
                    Uri downUri = task.getResult();

                    Toast.makeText(PostActivity.this, "Image uploaded successfully to Database...", Toast.LENGTH_SHORT).show();
                    downloadUrl = downUri.toString();

                    SavingPostInformationToDatabase();
                }
                else{
                    String message = task.getException().getMessage();
                    Toast.makeText(PostActivity.this, "Error: " + message, Toast.LENGTH_SHORT).show();
                }
            }
        });
    }

    private void SavingPostInformationToDatabase() {
        UsersRef.child(current_user_id).addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                if(dataSnapshot.exists()){
                    String userFullName = dataSnapshot.child("fullname").getValue().toString();
                    String userProfileImage = dataSnapshot.child("profileimage").getValue().toString();
                    TagUser(Description);
                    createNotification(userFullName, Description);
                    HashMap postsMap = new HashMap();
                    postsMap.put("uid", current_user_id);
                    postsMap.put("date", saveCurrentDate);
                    postsMap.put("time",saveCurrentTime);
                    postsMap.put("description", Description);
                    postsMap.put("postimage", downloadUrl);
                    postsMap.put("profileimage", userProfileImage);
                    postsMap.put("fullname", userFullName);
                    PostsRef.child(postRandomName).updateChildren(postsMap)
                            .addOnCompleteListener(new OnCompleteListener() {
                                    @Override
                                public void onComplete(@NonNull Task task) {
                                    if (task.isSuccessful()){
                                        SendUserToMainActivity();
                                        Toast.makeText(PostActivity.this, "Post update Successul!", Toast.LENGTH_SHORT).show();

                                    }
                                    else {
                                        Toast.makeText(PostActivity.this, "Error occured while updating your post.", Toast.LENGTH_SHORT).show();
                                    }
                                }
                            });
                }
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {

            }
        });
    }