转自: https://blog.csdn.net/nonamepao/article/details/120943245

项目介绍

本次项目在上一次类微信界面的设计上，增加了用recyclerview实现的模拟微信聊天联系人列表，其中从列表跳转到联系内容的部分使用了activity的跳转。

设计

列表界面

用一个xml来设计列表的界面，这里采用了最简单的单个textview作为标题模式。

    <?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="50dp"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_margin="8dp"
        android:orientation="vertical">

        <TextView
            android:id="@+id/textView1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="8dp"
            android:gravity="center"
            android:text="TextView" />

    </LinearLayout>

联系内容界面

显示联系内容的界面新建两个activity来实现，在activity2.xml文件作为被跳转的布局文件用来显示联系内容。

activity_1.xml

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:orientation="vertical"
        tools:context=".Activity1">

        <TextView
            android:id="@+id/textView7"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="这是第一个activity"
            android:textSize="40sp" />

    </LinearLayout>

activity_2.xml

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".Activity2">

        <TextView
            android:id="@+id/textView5"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="联系内容"
            android:textSize="40dp" />
    </LinearLayout>

列表的展示

修改之前的weixin.java文件，调用布局文件来实现列表的展示

    package com.example.wechatlike;

    import android.content.Context;
    import android.os.Bundle;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.app.Fragment;

    import androidx.recyclerview.widget.LinearLayoutManager;
    import androidx.recyclerview.widget.RecyclerView;

    import java.util.ArrayList;
    import java.util.List;

    public class weixin extends Fragment {

        private RecyclerView recyclerView;
        private MyAdapter myadapter;
        private List<String> list = new ArrayList<>();
        private Context context;

        public weixin() {

        }

        private void initData(){
            for(int i=0;i<10;i++) {
                list.add("联系人" + i );
            }
        }

        private void initView3(){
            context=this.getActivity();
            myadapter=new MyAdapter(list,context);

            LinearLayoutManager manager3=new LinearLayoutManager(context);
            manager3.setOrientation(LinearLayoutManager.VERTICAL);

            recyclerView.setAdapter(myadapter);
            recyclerView.setLayoutManager(manager3);
        }
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {

            View view = inflater.inflate(R.layout.fragment_weixin, container, false);
            recyclerView=view.findViewById(R.id.recycleview);
            initData();
            initView3();
            return view;
        }

    }

adpter适配器

adpter对前后接口进行适配，在常规recyclerview适配上增加OnItemClickListener 监听事件。

    package com.example.wechatlike;

    import android.content.Context;
    import android.content.Intent;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.TextView;

    import androidx.annotation.NonNull;
    import androidx.recyclerview.widget.RecyclerView;

    import java.util.List;

    public class MyAdapter extends RecyclerView.Adapter <MyAdapter.MyViewHolder>{
        private View itemView;
        private Context context;
        private MyAdapter myadapter;
        private List<String> list;
        private OnItemClickListener onItemClickListener;
        public MyAdapter(List<String> list, Context context){
            this.context=context;
            this.list =list;
        }

        @NonNull
        @Override
        public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            itemView= LayoutInflater.from(context).inflate(R.layout.item,parent,false);
            MyViewHolder myViewHolder=new MyViewHolder(itemView);
            return myViewHolder;
        }

        @Override
        public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
            holder.textView1.setText(list.get(position));
            holder.itemView.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View view) {
                    Intent intent = new Intent(context,Activity2.class);
                    context.startActivity(intent);
                }
            });

        }

        @Override
        public int getItemCount() {
            return list.size();
        }

        public class MyViewHolder extends RecyclerView.ViewHolder{
            TextView textView1;
            public MyViewHolder(@NonNull View itemView) {
                super(itemView);
                textView1=itemView.findViewById(R.id.textView1);

            }
        }

        public interface OnItemClickListener{
            void onItemClick(int position);
        }

        public void setOnItemClickListener(OnItemClickListener onItemClickListener){
            this.onItemClickListener = onItemClickListener;
        }
    }

结果展示

代码仓库：张润宇/WeChatlike https://gitee.com/noname-pao/we-chatlike