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;


public class MainActivity extends AppCompatActivity {
 private RecyclerView recyclerview;
 private EditText et_input;
 private ArrayList 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);
 }

 
 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));
 }

 
 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("");
  }
  }
 });

 }
}

package com.itheima74.chatui;



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;



class MsgAdapter extends RecyclerView.Adapter {
 private ArrayList mMsgList;

 MsgAdapter(ArrayList 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：

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考高分网。