Android RecyclerView的简单使用，实现了文件浏览器。

最新推荐文章于 2025-06-22 11:31:21 发布

Aaron - Wistron

最新推荐文章于 2025-06-22 11:31:21 发布

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分类专栏： Android开发

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本文介绍了一个简单的文件浏览器实现，利用RecyclerView展示文件列表，通过自定义Adapter和ViewHolder处理文件夹和文件的显示，支持点击文件夹进入下一级目录及返回上一级操作。

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这是一个文件浏览器的例子，点击文件夹就会进入到这里文件夹，点button就返回上一级目录，用到了RecyclerView。

布局比较简单，最上面是个textview显示当前路径，然后是个button返回上级目录，最后是一个recyclerview用来显示文件列表。

先贴一下布局，然后看怎么使用recyclerview实现。

mainactivity.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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=".MainActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/list"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/back" />

    <TextView
        android:id="@+id/path"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="TextView"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/back"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="Button"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/path" />
</android.support.constraint.ConstraintLayout>

item

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    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">

    <ImageView
        android:id="@+id/icon"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/name"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="TextView"
        app:layout_constraintStart_toEndOf="@+id/icon"
        app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

1.自定义 RecyclerView.adapter和RecyclerView.ViewHolder

我们这里的list使用的是标准的类型（File，类似的还有String等），所以没有额外新建自己的类。

这里使用了自定义接口的方法来实现的item的点击事件。当然你也可以直接在onBindViewHolder方法中直接实现，类似listview中的geview。

package com.example.sdcardbrowser;

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.ImageView;
import android.widget.TextView;

import java.io.File;
import java.util.List;

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

    private Context context;
    private List<File> list;
    //自定义点击接口，可以在activity中使用。 你也可以直接在onBindViewHolder中写点击事件。
    private MyViewHolder.OnItemClickListener mListener;

    public MyAdapter(Context context, List<File> list) {
        this.context = context;
        this.list = list;
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(context).inflate(R.layout.item, null);
        return new MyViewHolder(view,mListener);
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder myViewHolder, int i) {
        File file = list.get(i);

        myViewHolder.txt_path.setText(file.getName());
        if (file.isDirectory()) {
            myViewHolder.icon.setImageResource(R.drawable.folder);
        } else {
            myViewHolder.icon.setImageResource(R.drawable.file);
        }

    }

    public void setOnItemClickListener(MyViewHolder.OnItemClickListener listener){
        mListener=listener;
    }

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

    static class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        TextView txt_path;
        ImageView icon;
        OnItemClickListener mListener;

        public MyViewHolder(@NonNull View itemView,OnItemClickListener listener) {
            super(itemView);
            
            //定义了点击事件，然后在里面调用自己定义的接口（点击事件）
            mListener=listener;
            itemView.setOnClickListener(this);

            txt_path=itemView.findViewById(R.id.name);
            icon=itemView.findViewById(R.id.icon);
        }

        @Override
        public void onClick(View view) {
            mListener.onItemClick(view,getAdapterPosition());
        }

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

2.在activity中使用

package com.example.sdcardbrowser;

import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Environment;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

public class MainActivity extends AppCompatActivity implements MyAdapter.MyViewHolder.OnItemClickListener, View.OnClickListener {

    private RecyclerView recyclerView;
    private TextView txt_path;
    private Button btn_previous;

    private File currentParent;
    private File[] currentFiles;

    private String[] permissions = new String[]{
            Manifest.permission.WRITE_EXTERNAL_STORAGE
    };
    private MyAdapter myAdapter;
    private List<File> myList=new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //使用RecyclerView的基本步骤
        recyclerView = findViewById(R.id.list);
        //设置一个布局管理，你也可以设置横向滑动，还可以设置动画等
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        recyclerView.setLayoutManager(linearLayoutManager);

        txt_path = findViewById(R.id.path);
        btn_previous=findViewById(R.id.back);
        btn_previous.setOnClickListener(this);


        myAdapter=new MyAdapter(this,myList);
        //设置我们自定义点击事件监听
        myAdapter.setOnItemClickListener(this);
        //给RecyclerView设置adapter
        recyclerView.setAdapter(myAdapter);

        requestPermissions(permissions, 1);

    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if (requestCode == 1) {
            Log.d("a",""+grantResults[0]);
            if (grantResults != null && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                File root = Environment.getExternalStorageDirectory();
                if (root.exists()) {
                    currentParent = root;
                    currentFiles = root.listFiles();

                    Collections.addAll(myList,currentFiles);
                    myAdapter.notifyDataSetChanged();
                    txt_path.setText(currentParent.toString());

                }
            } else {
                Toast.makeText(this, "no permission", Toast.LENGTH_SHORT).show();
            }
        }
    }

    //自定义item点击事件的实现
    @Override
    public void onItemClick(View view, int position) {
        if(currentFiles[position].isFile()) return;
        File[] tmp=currentFiles[position].listFiles();
        if(tmp==null||tmp.length==0){
            Toast.makeText(this,"no files",Toast.LENGTH_SHORT).show();
        }else {
            currentParent=currentFiles[position];
            currentFiles=tmp;

            myList.clear();
            //数组与list的转换
            Collections.addAll(myList,currentFiles);
            myAdapter.notifyDataSetChanged();
            txt_path.setText(currentParent.toString());
        }
    }

    @Override
    public void onClick(View view) {

            if(!Environment.getExternalStorageDirectory().equals(currentParent)){
                currentParent=currentParent.getParentFile();
                currentFiles=currentParent.listFiles();

                myList.clear();
                Collections.addAll(myList,currentFiles);
                myAdapter.notifyDataSetChanged();
            }

    }
}