zoukankan      html  css  js  c++  java
  • Android 聊天界面

    界面:

    1.主界面 activity_main.xml

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#d8e0e8">
    
        <android.support.v7.widget.RecyclerView
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:id="@+id/msg_recycler_view"
            android:layout_weight="1" />
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >
    
        <EditText
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/input_text"
            android:layout_weight="1"
            android:hint="Type something here"
            android:maxLines="2" />
    
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/send"
            android:text="Send" />
        </LinearLayout>
    
    
    </LinearLayout>

    2.消息界面 msg_item.xml

    <?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="wrap_content"
        android:orientation="vertical"
        android:padding="10dp">
    
        <LinearLayout
            android:orientation="vertical"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/left_layout"
            android:layout_gravity="left"
            android:background="@drawable/left9">
    
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/left_msg"
                android:layout_gravity="center"
                android:layout_margin="10dp"
                android:textColor="#fff"
                />
    
        </LinearLayout>
    
        <LinearLayout
            android:orientation="vertical"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/right_layout"
            android:layout_gravity="right"
            android:background="@drawable/right">
    
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/right_msg"
                android:layout_gravity="center"
                android:layout_margin="10dp"
                android:textColor="#fff"
                />
    
        </LinearLayout>
    
    </LinearLayout>

    功能实现 

    1.main      MainActivity.java

    package com.example.ken.uibestpractice;
    
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.support.v7.widget.LinearLayoutManager;
    import android.support.v7.widget.RecyclerView;
    import android.text.method.LinkMovementMethod;
    import android.view.View;
    import android.widget.Button;
    import android.widget.EditText;
    
    import java.util.ArrayList;
    import java.util.List;
    import java.util.ResourceBundle;
    
    public class MainActivity extends AppCompatActivity {
    
        private List<Msg> msgList = new ArrayList<>();
        private EditText inputtext;
        private Button send;
        private RecyclerView msgRecyclerView;
        private MsgAdapter adapter;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            initMsgs();
            inputtext = (EditText) findViewById(R.id.input_text);
            send = (Button) findViewById(R.id.send);
            msgRecyclerView = (RecyclerView) findViewById(R.id.msg_recycler_view);
            LinearLayoutManager layoutManager = new LinearLayoutManager(this);
            msgRecyclerView.setLayoutManager(layoutManager);
            adapter = new MsgAdapter(msgList);
            msgRecyclerView.setAdapter(adapter);
            send.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    String content = inputtext.getText().toString();
                    if(""!=content){
                        Msg msg = new Msg(content, Msg.TYPE_SEND);
                        msgList.add(msg);
                        adapter.notifyItemInserted(msgList.size()-1);
                        msgRecyclerView.scrollToPosition(msgList.size()-1);
                        inputtext.setText("");
    
                    }
                }
            });
    
        }
    
        private void initMsgs(){
            Msg msg1 = new Msg("Hello guy.", Msg.TYPE_RECEIVED);
            msgList.add(msg1);
            Msg msg2 = new Msg("Hello. Who is it?", Msg.TYPE_SEND);
            msgList.add(msg2);
            Msg msg3 = new Msg("This is Tom. Nice to talking to you.", Msg.TYPE_RECEIVED);
            msgList.add(msg3);
        }
    }

    2.消息类 Msg.java

    package com.example.ken.uibestpractice;
    
    public class Msg {
        public static final int TYPE_RECEIVED = 0;
        public static final int TYPE_SEND = 1;
        private String content;
        private int type;
    
        public Msg(String content, int type){
            this.content = content;
            this.type = type;
        }
    
        public String getContent() {
            return content;
        }
    
        public int getType() {
            return type;
        }
    }

    3.消息适配器  MsgAdapter.java

    package com.example.ken.uibestpractice;
    
    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 MsgAdapter extends RecyclerView.Adapter<MsgAdapter.ViewHolder> {
    
        private List<Msg> mMsgList;
    
        static class ViewHolder extends RecyclerView.ViewHolder{
            LinearLayout leftlayout;
            LinearLayout rightlayout;
            TextView leftMsg;
            TextView rightMsg;
    
            public ViewHolder(View view){
                super(view);
                leftlayout = (LinearLayout) view.findViewById(R.id.left_layout);
                rightlayout = (LinearLayout) view.findViewById(R.id.right_layout);
                leftMsg = (TextView) view.findViewById(R.id.left_msg);
                rightMsg = (TextView) view.findViewById(R.id.right_msg);
            }
        }
    
        public MsgAdapter(List<Msg> msgList){
            mMsgList = msgList;
        }
    
        @NonNull
        @Override
        public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
            View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.msg_item, viewGroup, false);
            return new ViewHolder(view);
        }
    
        @Override
        public void onBindViewHolder(@NonNull ViewHolder viewHolder, int i) {
            Msg msg = mMsgList.get(i);
            if(msg.getType() == Msg.TYPE_RECEIVED){
                viewHolder.leftlayout.setVisibility(View.VISIBLE);
                viewHolder.rightlayout.setVisibility(View.GONE);
                viewHolder.leftMsg.setText(msg.getContent());
            }
    
            if(msg.getType() == Msg.TYPE_SEND){
                viewHolder.leftlayout.setVisibility(View.GONE);
                viewHolder.rightlayout.setVisibility(View.VISIBLE);
                viewHolder.rightMsg.setText(msg.getContent());
            }
        }
    
        @Override
        public int getItemCount() {
            return mMsgList.size();
        }
    }

    实现的效果是这样的:

  • 相关阅读:
    关于进程间通信
    ipc (进程间通信
    为什么需要进程间通信??
    重载、重写、覆盖
    conerstone代码回滚
    重载、重写、符号冲突、扩展
    UICollectionView(一)基本概念
    UICollectionViewFlowLayout & UICollectionViewDelegateFlowLayout
    UICollectionView框架总结
    UICollectionView
  • 原文地址:https://www.cnblogs.com/KEN-zj/p/9285888.html
Copyright © 2011-2022 走看看