android聊天界面键盘、表情切换丝滑实现的具体思路

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <!--  标题view -->
    <androidx.constraintlayout.widget.constraintlayout
        android:layout_width="match_parent"
        android:layout_height="?actionbarsize">

    </androidx.constraintlayout.widget.constraintlayout>

    <!--  聊天展示view   android:layout_weight="1" 让聊天内容填充剩下内容-->
    <com.scwang.smart.refresh.layout.smartrefreshlayout
        android:id="@+id/smartrefreshlayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        app:srlenableloadmore="false"
        app:srlenablerefresh="true">

 <!--  添加framelayout 是为了让键盘弹起时候，聊天内容（recyclerview）平移上去效果-->
        <framelayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <androidx.recyclerview.widget.recyclerview
                android:id="@+id/recyler"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_gravity="bottom"
                android:overscrollmode="never"
                android:scrollbars="none"
                android:visibility="invisible" />

        </framelayout>


    </com.scwang.smart.refresh.layout.smartrefreshlayout>

    <!-- 按钮：发送、输入框等view -->
    <linearlayout
        android:id="@+id/button_input"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">


    </linearlayout>

    <!-- 图片选择、语音、视频等view -->
    <androidx.constraintlayout.widget.constraintlayout
        android:id="@+id/other_select"
        android:layout_width="match_parent"
        android:layout_height="@dimen/common_dp_114"
        android:visibility="gone">

    </androidx.constraintlayout.widget.constraintlayout>

    <!-- emotion 表情选择view  这个是自定义view-->
    <emotionview
        android:id="@+id/emotion"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:visibility="gone" />

</linearlayout>

 private void viewlockheight(int height) {
        linearlayout.layoutparams layoutparams = (linearlayout.layoutparams) smartrefreshlayout.getlayoutparams();
        layoutparams.height = height == 0 ? smartrefreshlayout.getheight() : height;
        layoutparams.weight = 0.0f;
        smartrefreshlayout.setlayoutparams(layoutparams);
    }

 private void viewreleaselockheight(int delaymillis) {
        if (smartrefreshlayout != null) {
            smartrefreshlayout.postdelayed(new runnable() {
                @override
                public void run() {
                    if (smartrefreshlayout != null) {
                        linearlayout.layoutparams layoutparams = (linearlayout.layoutparams) smartrefreshlayout.getlayoutparams();
                        layoutparams.height = linearlayout.layoutparams.match_parent;
                        layoutparams.weight = 1.0f;
                        smartrefreshlayout.setlayoutparams(layoutparams);
                    }
                }
            }, delaymillis == 0 ? 200l : delaymillis);
        }
    }

  public void recyclerstopscroll() {
        recyclerview.stopscroll();
        layoutmanager.scrolltopositionwithoffset(0, 0);
    }