android识别手机文件 快速扫描并优化加载速度

一.最近在做一个需求，手机文件的快速扫描功能。
先附上效果图：

二.这边写了四种类型的文件识别，分别为音视频，图片，文件，并调取手机文件，这边分别用了四个Fragment，方便复制粘贴，用哪个粘哪个，不要太感动呢. 下面附上代码：

package com.example.wenjianshibie;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.viewpager.widget.ViewPager;

import android.os.Bundle;

import com.example.wenjianshibie.Adapter.MyFragmentPagerAdapter;
import com.example.wenjianshibie.Fragment.DocumentFileFragment;
import com.example.wenjianshibie.Fragment.MediaFragment;
import com.example.wenjianshibie.Fragment.OtherFragment;
import com.example.wenjianshibie.Fragment.PictureFragment;
import com.google.android.material.tabs.TabLayout;

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

public class MainActivity extends AppCompatActivity {
   
   
    TabLayout tabLayout;
    ViewPager viewPager;
    List<String> titles;
    List<Fragment> fragments;

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

        tabLayout = (TabLayout) findViewById(R.id.mytab);
        viewPager = (ViewPager) findViewById(R.id.vp_myfile);

        titles = new ArrayList<>();
        titles.add("影音");
        titles.add("图片");
        titles.add("文档");
        titles.add("其他");
        //创建构造方法
        initView();
    }

    private void initView() {
   
   
        fragments = new ArrayList<>();
        //影音
        fragments.add(new MediaFragment());
        //图片
        fragments.add(new PictureFragment());
        //文档
        fragments.add(new DocumentFileFragment());
        //其他
        fragments.add(new OtherFragment());

        //适配器
        MyFragmentPagerAdapter myFragmentPagerAdapter = new MyFragmentPagerAdapter(getSupportFragmentManager(), fragments, titles);

        viewPager.setAdapter(myFragmentPagerAdapter);
//        使用ViewPager进行设置
        tabLayout.setupWithViewPager(viewPager);
    }
}

这边附上Fragment 的适配器。

package com.example.wenjianshibie.Adapter;

import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;

import java.util.List;
//1.Framgnt 适配器
public class MyFragmentPagerAdapter extends FragmentPagerAdapter {
   
   
 
    private FragmentManager fragmentManager;
    private List<Fragment> fragmentList;
    private List<String> title;
 
    public MyFragmentPagerAdapter(FragmentManager supportFragmentManager, List<Fragment> fragments,List<String> titles) {
   
   
        super(supportFragmentManager);
        fragmentManager = supportFragmentManager;
        fragmentList = fragments;
        title = titles;
 
    }
 
    @Override
    public Fragment getItem(int position) {
   
   
        return fragmentList.get(position);
    }
 
    @Override
    public int getCount() {
   
   
        return fragmentList.size();
    }
 
    @Override
    public CharSequence getPageTitle(int position){
   
   
        return title.get(position);
    }
}

这边用到了是TabLayout+ViewPager之间的切换 有需要的可以粘贴哈.附上布局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">
    <com.google.android.material.tabs.TabLayout
        android:id="@+id/mytab"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabTextColor="#ffffff"
        app:tabBackground="@drawable/tab_background"
        app:tabMode="fixed"
        />
    <androidx.viewpager.widget.ViewPager
        android:id="@+id/vp_myfile"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/mytab"/>

</RelativeLayout>

1.第一个Fragment 音视频功能.

package com.example.wenjianshibie.Fragment;

import android.app.ProgressDialog;

import android.os.Build;
import android.provider.MediaStore;
import android.view.View;
import android.widget.ExpandableListView;

import androidx.annotation.RequiresApi;

import com.example.wenjianshibie.Adapter.ExpandablieAdapter;
import com.example.wenjianshibie.Base.FileInfo;
import com.example.wenjianshibie.Gongjulei.FileInfoManager;
import com.example.wenjianshibie.Adapter.ObserverAdapter;
import io.reactivex.Observable;
import io.reactivex.ObservableEmitter;
import io.reactivex.ObservableOnSubscribe;
import com.example.wenjianshibie.R;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.schedulers.Schedulers;

/**
 * 1.影音Fragment
 */
public class MediaFragment extends BaseFileFragment {
   
   
    private ExpandableListView expandableListview;
    private FileInfoManager bfm;
    private ArrayList<String> groupList = new ArrayList<>();
    private ArrayList<List<FileInfo>> bxFilesList = new ArrayList<List<FileInfo>>();
    private ExpandablieAdapter expandablieAdapter;
    private Map<String, List<FileInfo>> avChooseMap = new HashMap<>();
    private List<FileInfo> audioFiles = new ArrayList<>();
    private List<FileInfo> videoFiles = new ArrayList<>();
    private ProgressDialog progressDialog;
    @Override
    public int getLayoutResource() {
   
   
        return R.layout.fragment_media;
    }

    @Override
    public void initView(View view) {
   
   
        expandableListview = view.findViewById(R.id.expandablelistview);
        expandableListview.setGroupIndicator(null);
        initData();
        setOnClick();
    }

    private void initData() {
   
   
        groupList.clear();
        bxFilesList.clear();
        groupList.add("音频");
        groupList.add("视频");
        bfm = new FileInfoManager();
        progressDialog = new ProgressDialog(getActivity());
        progressDialog.setMessage("数据加载中");
        progressDialog.setCanceledOnTouchOutside(false);
        if (avChooseMap.size() == 0){
   
   
            for (int i = 0; i < groupList.size(); i++) {
   
   
                List<FileInfo> bxFiles = new ArrayList<>();
                avChooseMap.put(groupList.get(i),bxFiles);
            }
        }
        setAudioData();
    }

    private void setAudioData() {
   
   
        //获取
        Observable.create(new ObservableOnSubscribe<List<FileInfo>>() {
   
   
            @RequiresApi(api = Build.VERSION_CODES.KITKAT)
            @Override
            public void subscribe(ObservableEmitter<List<FileInfo>> subscriber) throws Exception {
   
   
                //设置音频
                audioFiles = bfm.getMediaFiles(getActivity(), MediaStore.Audio.Media.EXTERNAL_CONTENT_URI);
//                设置视频
                videoFiles = bfm.getMediaFiles(getActivity(), MediaStore.Audio.Media.EXTERNAL_CONTENT_URI);
                subscriber.onComplete();
            }
        }).subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new ObserverAdapter<