Question

我正在使用firebase开发一个Android聊天，但我在分配消息的严重性方面遇到了问题。发件人的邮件在左边，收件人的邮件在右边。

这是我的代码：

@Override
public void onStart() {
    super.onStart();
    mFirebaseAdapter1 = new FirebaseRecyclerAdapter<ChatModel, ChatMessageViewHolder>(ChatModel.class,
            R.layout.textview,
            ChatMessageViewHolder.class,
            ref_chatchildnode1) {
        @Override
        protected void populateViewHolder(ChatMessageViewHolder chatMessageViewHolder, ChatModel m, int i) {

            if (m.getSender().equals(LoggedInUser)) {

                chatMessageViewHolder.msg.setText(m.getMessage());
                chatMessageViewHolder.msg.setBackground(ContextCompat.getDrawable(getActivity(), R.color.user));

            } else {

                chatMessageViewHolder.msg.setText(m.getMessage());
                chatMessageViewHolder.msg.setBackground(ContextCompat.getDrawable(getActivity(),R.color.ae));
            }

        }
    };
    mRecyclerView.setAdapter(mFirebaseAdapter1);
    //mRecyclerView.setAdapter(mFirebaseAdapter2);
    mFirebaseAdapter1.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
        @Override
        public void onItemRangeInserted(int positionStart, int itemCount) {
            super.onItemRangeInserted(positionStart, itemCount);
            int friendlyMessageCount = mFirebaseAdapter1.getItemCount();
            int lastVisiblePosition = linearLayoutManager.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 >= (friendlyMessageCount - 1) &&
                            lastVisiblePosition == (positionStart - 1))) {
                mRecyclerView.scrollToPosition(positionStart);
            }
        }
    });
}

我尝试以编程方式执行LinearLayout但没有任何反应。这是我做的：

if (m.getSender().equals(LoggedInUser)) {

    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    params.weight = 1.0f;
    params.gravity = Gravity.RIGHT;

    chatMessageViewHolder.msg.setText(m.getMessage());
    chatMessageViewHolder.msg.setLayoutParams(params);
    chatMessageViewHolder.msg.setBackground(ContextCompat.getDrawable(getActivity(), R.color.user));

} else {

    chatMessageViewHolder.msg.setText(m.getMessage());
    chatMessageViewHolder.msg.setGravity(Gravity.LEFT);
    chatMessageViewHolder.msg.setBackground(ContextCompat.getDrawable(getActivity(),R.color.ae));

}

请帮我构建我的代码。

Answer 1

现在我可以看到2个可能的解决方案... 第一个尝试使用两个带有firebaseUI的ViewHolders（我不知道是否可以这样做）和第二个，最简单，每行使用相对布局并放入气泡聊天视图，然后使用对齐父右或左父。

Answer 2

我解决了我的问题。

这就是我所做的。

if (m.getSender().equals(LoggedInUser)) {

    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    params.weight = 1.0f;
    params.gravity = Gravity.RIGHT;

    chatMessageViewHolder.msg.setText(m.getMessage());
    chatMessageViewHolder.msg.setLayoutParams(params);
    chatMessageViewHolder.msg.setBackground(ContextCompat.getDrawable(getActivity(), R.color.user));

} else {
    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    params.weight = 1.0f;
    params.gravity = Gravity.LEFT;

    chatMessageViewHolder.msg.setText(m.getMessage());
    chatMessageViewHolder.msg.setLayoutParams(params);
    chatMessageViewHolder.msg.setBackground(ContextCompat.getDrawable(getActivity(),R.color.ae));
}

Android firebase聊天发送器和接收器重力左右不起作用

2 个答案: