這次實驗我遇到的困難是在xml文件的佈局和對於第三個實驗内容的實現上，

这次实验我遇到的困难是在xml文件的布局和对于第三个实验内容的实现上，一开始我进行聊天界面的布局设计，因为控件没有constrains，我就点了infer constrains，然后直接运行，就只会出现两个消息，之后的输入也无法显示，之后才发现是布局的锅，下面的输入框和recycleview的距离定死了，就不能输入了，之后改了才好。实验三内容没想出来，一开始准备添加recycleview的点击按钮，但是没成功，问了同学的方法才行的。

这次实验我遇到的困难是在xml文件的布局和对于第三个实验内容的实现上，一开始我进行聊天界面的布局设计，因为控件没有constrains，我就点了infer constrains，然后直接运行，就衹会出现两个消息，之後的輸入也無法顯示，之後才發現是佈局的鍋，下面的輸入框和recycleview的距離定死了，就不能輸入了，之後改了才好。 实验三内容没想出来，一开始准备添加recycleview的点击按钮，但是没成功，问了同学的方法才行的。

The difficulty I met in this experiment was the layout of XML file and the implementation of the third experiment content. At the beginning, I designed the layout of chat interface, because the control didn't have constraints, so I ordered infer Constraints, and then run it directly. Only two messages will appear. Later input cannot be displayed. Later, it is found that it is a layout pot. If the distance between the input box below and recycleview is fixed, you can't input it. After that, you can change it. The third experiment didn't come up with the content. At first, I was going to add the click button of recycleview, but it didn't succeed. I asked my classmates for the method.<br>