从Android 5.0开始，谷歌公司推出了一个用于大量数据展示的新控件RecylerView，可以用来代替传统的ListView，更加强大和灵活。在上篇文章给大家介绍了Android RecylerView入门教程，大家可以点击查看详情。
效果图如下：(其中，聊天框背景图用9-patch图，可以内容自适应调节。利用AndroidStudio自带的功能制作就行了，图片->右键->create 9-patch file。
其中要注意的是：
1、将9-patch图保存到drawable目录下才管用。
2、要将背景图片处理一下，缩放到足够小，它会自动伸缩。)
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; } }} 总结
以上所述是小编给大家介绍的Android中使用RecylerView实现聊天框效果，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对VEVB武林网网站的支持！
注：相关教程知识阅读请移步到Android开发频道。
