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本篇文章给大家分享的是有关怎么在android中利用recyclerview制作一个聊天界面,小编觉得挺实用的,因此分享给大家学习,希望大家阅读完这篇文章后可以有所收获,话不多说,跟着小编一起来看看吧。
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>
以上就是怎么在android中利用recyclerview制作一个聊天界面,小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注亿速云行业资讯频道。
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