解决之道：在EditText的父级控件设置成
android:focusable="true"
android:focusableInTouchMode="true"
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:focusable="true"
android:focusableInTouchMode="true"
android:fitsSystemWindows="true"
tools:context="com.zxzd.im.new_branch.chat.CreateGroupChat">