Android studio中使用Recyclerview与Activity跳转

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