Android中使用RecylerView实现聊天框效果

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小牛知识库网站的支持！