如何在FirebaseRecyclerAdapter中设置多个布局?

问题描述

我只是使用Firebase，在XML中使用RecyclerView和在Android中使用FirebaseRecyclerAdapter来创建聊天应用程序，但是问题是，当我通过EditText发送消息时，消息已成功发送并显示在我设置的右侧您可以在下面的代码中看到布局，但是问题是当我关闭应用程序并重新启动消息时，请转到左侧:

I just make a chat application with Firebase and using RecyclerView in XML and using FirebaseRecyclerAdapter in Android, but the problem is that when I send a message through EditText, the message is sent successfully and show to the right side that I set with Layout as you can see in code below but the problem is that when I close app and restart the message go to left side:

            mFirebaseRecyclerAdapter = new FirebaseRecyclerAdapter<MessageModel, MessageViewHolder>(
                MessageModel.class,
                R.layout.layout_message_sender,
                MessageViewHolder.class,
                mFirebaserefrence_messages) {


            @Override
            public int getItemViewType(int position) {
                MessageModel model = getItem(position);
                if (model.getUserId() == mUserId) {
                    return R.layout.layout_message_sender;
                }
                else {
                    return R.layout.layout_message_recipitent;
                }
            }

            @Override
            protected void populateViewHolder(MessageViewHolder viewHolder, MessageModel model, int position) {
                viewHolder.mTextView_userMessage.setText(model.getUserMessage());
                if (model.getUserName() == null) {
                    viewHolder.mTextView_userName.setText("Anonymous");
                } else {
                    viewHolder.mTextView_userName.setText(model.getUserName());
                }
                if (model.getUserImageUrl() == null) {
                    viewHolder.mCircleImageView_userImage
                            .setImageDrawable(ContextCompat.getDrawable(ChatActivity.this,
                                    R.drawable.ic_account_circle_red_48dp));
                } else {
                    Glide.with(ChatActivity.this)
                            .load(model.getUserImageUrl())
                            .into(viewHolder.mCircleImageView_userImage);
                }
            }

        };

        mFirebaseRecyclerAdapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
            @Override
            public void onItemRangeInserted(int positionStart, int itemCount) {
                super.onItemRangeInserted(positionStart, itemCount);
                int messageCount = mFirebaseRecyclerAdapter.getItemCount();
                int lastVisiblePosition = mLinearLayoutManager.findLastCompletelyVisibleItemPosition();
                // If the recycler view is initially being loaded or the user is at the bottom of the list, scroll
                // to the bottom of the list to show the newly added message.
                if (lastVisiblePosition == -1 ||
                        (positionStart >= (messageCount - 1) && lastVisiblePosition == (positionStart - 1))) {
                    mRecyclerView.scrollToPosition(positionStart);
                }
            }
        });

        mRecyclerView.setLayoutManager(mLinearLayoutManager);
        mRecyclerView.setAdapter(mFirebaseRecyclerAdapter);

        mEditText_message = (EditText) findViewById(R.id.editText_message);
        mEditText_message.addTextChangedListener(new TextWatcher() {
                                                     @Override
                                                     public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                                                     }

                                                     @Override
                                                     public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                                                         if (charSequence.toString().trim().length() > 0) {
                                                             mImageButton.setEnabled(true);
                                                         } else {
                                                             mImageButton.setEnabled(false);
                                                         }
                                                     }

                                                     @Override
                                                     public void afterTextChanged(Editable editable) {
                                                     }
                                                 }
        );

        mImageButton = (ImageButton) findViewById(R.id.imageButton_send);

        mImageButton.setOnClickListener(this);
    }

    @Override
    public void onStart() {
        super.onStart();
        mFirebaseAuth.addAuthStateListener(mFirebaseAuthListener);
    }

    @Override
    public void onStop() {
        super.onStop();
        if (mFirebaseAuthListener != null) {
            mFirebaseAuth.removeAuthStateListener(mFirebaseAuthListener);
        }
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.item_signOut:
                mFirebaseAuth.signOut();
                startActivity(new Intent(ChatActivity.this, SignInActivity.class));
                finish();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    @Override
    public void onClick(View v) {
        if (v == mImageButton) {
            MessageModel messageModel = new MessageModel(mUserId,
                    mUserImageUrl,
                    mEditText_message.getText().toString(),
                    mUsername,
                    null);
            mFirebaserefrence_messages.push().setValue(messageModel);
            mEditText_message.setText(null);
        }
    }
}

推荐答案

public Class MyAdapter extends FirebaseRecyclerAdapter<ModelClass, ViewHolderClass> {

    private static final int LAYOUT_ONE = 1;

    public MyAdapter(Class<ModelClass> modelClass,
                       int modelLayout,
                       Class<ViewHolderClass> viewHolderClass,
                       Query ref) {

        super(modelClass, modelLayout, viewHolderClass, ref);

    }

    @Override
    public ViewHolderClass onCreateViewHolder(ViewGroup parent, int viewType) {

        View view;

        if (viewType == LAYOUT_ONE) {

            view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_one, parent, false);
            return new ViewHoldeClassr(view);

        }

        else {

            view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_two, parent, false);
            return new ViewHolderClass(view);

        }
    }

    @Override
    public int getItemViewType(int position)

        ModelClass model = getItem(position);

        if (model.caseWhenYouWentToUseLayoutOne)) {
            return LAYOUT_ONE;
        }

        return position;
    }

}

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