如何在Android中使用RecylerView实现聊天框效果？针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
1、activity_main.xml的代码如下：
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" xmlns:android="http://schemas.android.com/apk/res/android"> <android.support.v7.widget.RecyclerView android:id="@+id/Main_rView" android:layout_width="match_parent" android:layout_height="wrap_content" android:paddingBottom="50dp"></android.support.v7.widget.RecyclerView> <LinearLayout android:layout_width="match_parent" android:layout_height="50dp" android:layout_alignParentBottom="true" android:padding="5dp" android:orientation="horizontal"> <EditText android:id="@+id/Main_etContent" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content" android:minLines="1" android:maxLines="3" android:hint="说点什么吧" android:textSize="14dp"/> <Button android:id="@+id/Main_btnSend" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="14dp" android:text="Send" android:textAllCaps="false"/> </LinearLayout> </RelativeLayout>
2、layout_item_content.xml的代码如下：
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="10dp" xmlns:android="http://schemas.android.com/apk/res/android"> <LinearLayout android:id="@+id/Layout_Item_Content_lLayoutReceive" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="10dp" android:layout_alignParentLeft="true" android:background="@drawable/bg_chat2" android:orientation="vertical"> <TextView android:id="@+id/Layout_Item_Content_tvContentReceive" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="10dp" android:text="内容内容内" android:textSize="14dp"/> </LinearLayout> <LinearLayout android:id="@+id/Layout_Item_Content_lLayoutSend" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="10dp" android:layout_alignParentRight="true" android:background="@drawable/bg_chat1" android:orientation="vertical"> <TextView android:id="@+id/Layout_Item_Content_tvContentSend" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="内容" android:textSize="14dp" android:layout_marginTop="20dp" android:layout_marginLeft="5dp" android:layout_marginRight="5dp" /> </LinearLayout> </RelativeLayout>
3、RecyclerViewAdapter.java的代码如下：
package com.deepreality.recyclerviewdemo;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import java.util.List;
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {
private Context mContext;
private List<Tb_ChatContent> tbChatContentList;
private Tb_ChatContent tb_chatContent;
static class ViewHolder extends RecyclerView.ViewHolder {
private LinearLayout lLayoutReceive, lLayoutSend;
private TextView tvReceive, tvSend;
public ViewHolder(View itemView) {
super(itemView);
lLayoutReceive = itemView.findViewById(R.id.Layout_Item_Content_lLayoutReceive);
lLayoutSend = itemView.findViewById(R.id.Layout_Item_Content_lLayoutSend);
tvReceive = itemView.findViewById(R.id.Layout_Item_Content_tvContentReceive);
tvSend = itemView.findViewById(R.id.Layout_Item_Content_tvContentSend);
}
}
public RecyclerViewAdapter(Context mContext, List<Tb_ChatContent> tbChatContentList) {
this.mContext = mContext;
this.tbChatContentList = tbChatContentList;
}
@NonNull
@Override
public RecyclerViewAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mContext).inflate(R.layout.layout_item_content, parent, false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(@NonNull RecyclerViewAdapter.ViewHolder holder, int position) {
tb_chatContent = tbChatContentList.get(position);
if (tb_chatContent.getType() == 0) {
holder.lLayoutReceive.setVisibility(View.VISIBLE);
holder.lLayoutSend.setVisibility(View.GONE);
holder.tvReceive.setText(tb_chatContent.getContent());
} else {
holder.lLayoutReceive.setVisibility(View.GONE);
holder.lLayoutSend.setVisibility(View.VISIBLE);
holder.tvSend.setText(tb_chatContent.getContent());
}
}
@Override
public int getItemCount() {
return tbChatContentList.size();
}
}4、MainActivity.java的代码如下：
package com.deepreality.recyclerviewdemo;
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
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;
import java.util.List;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private Context mContext;
private RecyclerView rViewChat;
private EditText etContent;
private Button btnSend;
private List<Tb_ChatContent> tbChatContentList;
private Tb_ChatContent tb_chatContent;
private RecyclerViewAdapter recyclerViewAdapter;
private String[] arrayContents = new String[]{"How are you", "Fine,Thank you.", "How are you"
, "Fine,Thank you.", "How are you", "Fine,Thank you."};
private int[] arrayTypes = new int[] {0, 1, 0, 1, 0, 1};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
baseDataInit();
bindViews();
viewsAddListener();
viewsDataInit();
}
private void baseDataInit() {
mContext = this;
tbChatContentList = new ArrayList<>();
}
private void bindViews() {
rViewChat = findViewById(R.id.Main_rView);
etContent = findViewById(R.id.Main_etContent);
btnSend = findViewById(R.id.Main_btnSend);
}
private void viewsAddListener() {
btnSend.setOnClickListener(this);
}
private void viewsDataInit() {
rViewSetAdapter();
}
private void rViewSetAdapter() {
for (int i = 0; i < arrayContents.length; i++) {
tb_chatContent = new Tb_ChatContent(arrayContents[i], arrayTypes[i]);
tbChatContentList.add(tb_chatContent);
}
//设置RecylerView的排列方式（线性，网格，瀑布流三种）
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(mContext);
rViewChat.setLayoutManager(linearLayoutManager);
//创建并绑定数据适配器
recyclerViewAdapter = new RecyclerViewAdapter(mContext, tbChatContentList);
rViewChat.setAdapter(recyclerViewAdapter);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.Main_btnSend: {
tb_chatContent = new Tb_ChatContent(etContent.getText().toString(), Tb_ChatContent.TYPE_SEND);
tbChatContentList.add(tb_chatContent);
//数据刷新
recyclerViewAdapter.notifyDataSetChanged();
//滑动到某一位置
rViewChat.smoothScrollToPosition(tbChatContentList.size() - 1);
break;
}
default:break;
}
}
}Android是一种基于Linux内核的自由及开放源代码的操作系统，主要使用于移动设备，如智能手机和平板电脑，由美国Google公司和开放手机联盟领导及开发。
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