android recyclerview模拟聊天界面

本文实例为大家分享了android recyclerview模拟聊天界面的具体代码，供大家参考，具体内容如下

效果图：

实现代码：

package com.itheima74.chatui;

import android.os.bundle;
import android.support.v7.app.appcompatactivity;
import android.support.v7.widget.linearlayoutmanager;
import android.support.v7.widget.recyclerview;
import android.view.view;
import android.widget.button;
import android.widget.edittext;

import java.util.arraylist;

/**
 * 聊天界面,使用recyclerview实现
 * 效果不好,发送的消息不能靠右对齐,
 * 不知何故,怎么弄都弄不好,请教!
 * 问题的解决:用relativelayout代替linearlayout可以解决上述问题
 */
public class mainactivity extends appcompatactivity {
 private recyclerview recyclerview;
 private edittext et_input;
 private arraylist<msg> mmsglist;
 private msgadapter mmsgadapter;

 @override
 protected void oncreate(bundle savedinstancestate) {
 super.oncreate(savedinstancestate);
 setcontentview(r.layout.activity_main);

 initview();
 initdata();
 initadapter();
 }

 private void initadapter() {
 mmsgadapter = new msgadapter(mmsglist);
 recyclerview.setadapter(mmsgadapter);
 }

 /**
 * 初始化数据源
 */
 private void initdata() {
 mmsglist = new arraylist<>();
 mmsglist.add(new msg("hello!", msg.type_receive));
 mmsglist.add(new msg("hello! who is that?", msg.type_send));
 mmsglist.add(new msg("this is jack,nice to meet you!", msg.type_receive));
 }

 /**
 * 初始化控件
 */
 private void initview() {
 recyclerview = (recyclerview) findviewbyid(r.id.recyclerview);
 et_input = (edittext) findviewbyid(r.id.et_input);
 button bt_send = (button) findviewbyid(r.id.bt_send);

 linearlayoutmanager layoutmanager = new linearlayoutmanager(this);
 layoutmanager.setorientation(linearlayoutmanager.vertical);
 recyclerview.setlayoutmanager(layoutmanager);

 bt_send.setonclicklistener(new view.onclicklistener() {
  @override
  public void onclick(view v) {
  string content = et_input.gettext().tostring().trim();
  // 如果用户没有输入,则是一个空串""
  if (!content.isempty()) {
   mmsglist.add(new msg(content, msg.type_send));
   // 通知数据适配器刷新界面
   mmsgadapter.notifydatasetchanged();
   // 定位到最后一行
   recyclerview.scrolltoposition(mmsglist.size() - 1);
   // 输入框置空
   et_input.settext("");
  }
  }
 });

 }
}

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:background="#d8e0e8"
 android:orientation="vertical">

 <android.support.v7.widget.recyclerview
 android:id="@+id/recyclerview"
 android:layout_width="match_parent"
 android:layout_height="0dp"
 android:layout_weight="1" />

 <linearlayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:orientation="horizontal">

 <edittext
  android:id="@+id/et_input"
  android:layout_width="0dp"
  android:layout_height="wrap_content"
  android:layout_weight="1"
  android:hint="请输入要发送的内容" />

 <button
  android:id="@+id/bt_send"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="发送" />
 </linearlayout>

</linearlayout>

package com.itheima74.chatui;

/**
 * created by my on 2017/3/3.
 */

class msg {
 static final int type_receive = 1;
 static final int type_send = 2;
 string content;
 int type;

 msg(string content, int type) {
 this.content = content;
 this.type = type;
 }
}

package com.itheima74.chatui;

import android.support.v7.widget.recyclerview;
import android.view.view;
import android.view.viewgroup;
import android.widget.textview;

import java.util.arraylist;

/**
 * created by my on 2017/3/3.
 */

class msgadapter extends recyclerview.adapter<msgadapter.viewholder> {
 private arraylist<msg> mmsglist;

 msgadapter(arraylist<msg> mmsglist) {
 this.mmsglist = mmsglist;
 }

 @override
 public viewholder oncreateviewholder(viewgroup parent, int viewtype) {
 view view = view.inflate(parent.getcontext(), r.layout.recyclerview_item, null);
 return new viewholder(view);
 }

 @override
 public void onbindviewholder(viewholder holder, int position) {
 msg msg = mmsglist.get(position);
 if (msg.type == msg.type_receive) {
  holder.tv_receive.setvisibility(view.visible);
  holder.tv_send.setvisibility(view.gone);
  holder.tv_receive.settext(msg.content);
 } else {
  holder.tv_send.setvisibility(view.visible);
  holder.tv_receive.setvisibility(view.gone);
  holder.tv_send.settext(msg.content);
 }
 }

 @override
 public int getitemcount() {
 return mmsglist.size();
 }

 static class viewholder extends recyclerview.viewholder {
 private textview tv_receive;
 private textview tv_send;

 viewholder(view itemview) {
  super(itemview);
  tv_receive = (textview) itemview.findviewbyid(r.id.tv_receive);
  tv_send = (textview) itemview.findviewbyid(r.id.tv_send);
 }
 }
}

xml：

<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:padding="10dp">

 <textview
 android:id="@+id/tv_receive"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:background="@drawable/message_left"
 android:gravity="center"
 android:text="who?"
 android:textsize="20sp" />

 <textview
 android:id="@+id/tv_send"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_alignparentright="true"
 android:layout_below="@id/tv_receive"
 android:background="@drawable/message_right"
 android:gravity="center"
 android:text="i am your father"
 android:textsize="20sp" />


</relativelayout>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。