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;@Overrideprotected 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;}@Overridepublic Fragment getItem(int position) {return fragmentList.get(position);}@Overridepublic int getCount() {return fragmentList.size();}@Overridepublic 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.TabLayoutandroid: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.ViewPagerandroid: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;@Overridepublic int getLayoutResource() {return R.layout.fragment_media;}@Overridepublic 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)@Overridepublic 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<List<FileInfo>>() {@Overridepublic void onComplete() {progressDialog.dismiss();bxFilesList.add(audioFiles);bxFilesList.add(videoFiles);expandablieAdapter = new ExpandablieAdapter(getActivity(), groupList, bxFilesList,avChooseMap);expandableListview.setAdapter(expandablieAdapter);}});}private void setOnClick() {//父节点点击事件expandableListview.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {@Overridepublic boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {expandablieAdapter.setChooseMap(avChooseMap);expandablieAdapter.notifyDataSetChanged();return false;}});}
}

2.然后是图片识别的Fragment 都是单独拆分开的.

package com.example.wenjianshibie.Fragment;import android.app.ProgressDialog;
import android.os.Bundle;import androidx.fragment.app.Fragment;import android.provider.MediaStore;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.ExpandableListView;import com.example.wenjianshibie.Adapter.ExpandabliePicAdapter;
import com.example.wenjianshibie.Base.FileInfo;
import com.example.wenjianshibie.Base.FolderInfo;
import com.example.wenjianshibie.Gongjulei.LocalMediaLoader;
import com.example.wenjianshibie.R;import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;/*** 2.图片Fragment*/
public class PictureFragment extends BaseFileFragment {private ExpandableListView expandableListview;private ExpandabliePicAdapter expandabliePicAdapter;private static String[] IMAGE_PROJECTION = new String[]{MediaStore.Images.Media.DATA,MediaStore.Images.Media.DISPLAY_NAME,MediaStore.Images.Media.DATE_ADDED,MediaStore.Images.Media._ID,};private List<String> folderList = new ArrayList<>();private List<List<FileInfo>> fileList = new ArrayList<>();private ProgressDialog progressDialog;private Map<String, List<FileInfo>> picChooseMap = new HashMap<>();@Overridepublic int getLayoutResource() {return R.layout.fragment_picture;}@Overridepublic void initView(View view) {progressDialog = new ProgressDialog(getActivity());progressDialog.setMessage("数据加载中");progressDialog.setCanceledOnTouchOutside(false);progressDialog.show();expandableListview = view.findViewById(R.id.expand_picture);expandableListview.setGroupIndicator(null);expandabliePicAdapter = new ExpandabliePicAdapter(getActivity(), folderList, fileList,picChooseMap);expandableListview.setAdapter(expandabliePicAdapter);initData();setOnClick();}private void initData() {folderList.clear();fileList.clear();new LocalMediaLoader(getActivity(), LocalMediaLoader.TYPE_IMAGE).loadAllImage(new LocalMediaLoader.LocalMediaLoadListener() {@Overridepublic void loadComplete(List<FolderInfo> folders) {progressDialog.dismiss();for (int i = 0; i < folders.size(); i++) {folderList.add(folders.get(i).getName());fileList.add(folders.get(i).getImages());List<FileInfo> fileInfos = new ArrayList<>();picChooseMap.put(folders.get(i).getName(), fileInfos);}expandabliePicAdapter.setNewData(folderList, fileList);expandabliePicAdapter.notifyDataSetChanged();}});}private void setOnClick() {//父节点点击事件expandableListview.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {@Overridepublic boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {expandabliePicAdapter.setChooseMap(picChooseMap);expandabliePicAdapter.notifyDataSetChanged();return false;}});//子节点点击事件expandableListview.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {@Overridepublic boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {CheckBox fileCheckBox = v.findViewById(R.id.fileCheckBox);FileInfo fileInfo = fileList.get(groupPosition).get(childPosition);List<FileInfo> chooseFiles = picChooseMap.get(folderList.get(groupPosition));if (chooseFiles.contains(fileInfo)) {chooseFiles.remove(fileInfo);picChooseMap.put(folderList.get(groupPosition), chooseFiles);fileCheckBox.setChecked(false);} else {chooseFiles.add(fileInfo);picChooseMap.put(folderList.get(groupPosition), chooseFiles);fileCheckBox.setChecked(true);}return true;}});}
}

3.这边是文档识别的代码.

package com.example.wenjianshibie.Fragment;import android.app.ProgressDialog;
import android.os.Bundle;import androidx.fragment.app.Fragment;import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.ExpandableListView;import com.example.wenjianshibie.Adapter.ExpandablieDocAdapter;
import com.example.wenjianshibie.Adapter.ObserverAdapter;
import com.example.wenjianshibie.Base.FileInfo;
import com.example.wenjianshibie.Gongjulei.FileInfoManager;
import com.example.wenjianshibie.R;import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;import io.reactivex.Observable;
import io.reactivex.ObservableEmitter;
import io.reactivex.ObservableOnSubscribe;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.schedulers.Schedulers;/***3.文档Fragment*/
public class DocumentFileFragment extends BaseFileFragment {private ExpandableListView expandableListview;private List<String> groupList = new ArrayList<>();private ProgressDialog progressDialog;private ExpandablieDocAdapter expandablieDocAdapter;private Map<String, List<FileInfo>> docChooseMap = new HashMap<>();private FileInfoManager bfm;private List<List<FileInfo>> docFiles;public DocumentFileFragment() {}@Overridepublic int getLayoutResource() {return R.layout.fragment_document_file;}@Overridepublic void initView(View view) {bfm = new FileInfoManager();progressDialog = new ProgressDialog(getActivity());progressDialog.setMessage("加载中");progressDialog.setCanceledOnTouchOutside(false);progressDialog.show();expandableListview = view.findViewById(R.id.expandablelistview);expandableListview.setGroupIndicator(null);initData();setOnClick();}private void initData() {groupList.clear();groupList.add("TXT");groupList.add("WORD");groupList.add("EXCEL");groupList.add("PPT");groupList.add("PDF");groupList.add("XML");groupList.add("HTML");if (docChooseMap.size() == 0){for (int i = 0; i < groupList.size(); i++) {ArrayList<FileInfo> strings = new ArrayList<>();docChooseMap.put(groupList.get(i),strings);}}docFiles = bfm.geDocListFile();if (docFiles == null){Observable.create(new ObservableOnSubscribe<List<List<FileInfo>>>() {@Overridepublic void subscribe(ObservableEmitter<List<List<FileInfo>>> subscriber) throws Exception {//优化完美docFiles = bfm.scanFilet(DocumentFileFragment.this.getActivity());subscriber.onNext(docFiles);if (docFiles != null) {progressDialog.dismiss();}}}).subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread()).subscribe(new ObserverAdapter<List<List<FileInfo>>>() {@Overridepublic void onNext(List<List<FileInfo>> strings) {expandablieDocAdapter = new ExpandablieDocAdapter(getActivity(), groupList, strings,docChooseMap);expandableListview.setAdapter(expandablieDocAdapter);progressDialog.dismiss();}@Overridepublic void onComplete() {progressDialog.dismiss();}@Overridepublic void onError(Throwable e) {progressDialog.dismiss();}});}else {expandablieDocAdapter = new ExpandablieDocAdapter(getActivity(), groupList, docFiles,docChooseMap);expandableListview.setAdapter(expandablieDocAdapter);progressDialog.dismiss();}}private void setOnClick() {expandableListview.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {@Overridepublic boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {expandablieDocAdapter.setChooseMap(docChooseMap);expandablieDocAdapter.notifyDataSetChanged();return false;}});expandableListview.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {@Overridepublic boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {CheckBox fileCheckBox = v.findViewById(R.id.fileCheckBox);FileInfo fileInfo = docFiles.get(groupPosition).get(childPosition);List<FileInfo> fileList = docChooseMap.get(groupList.get(groupPosition));if (fileList.contains(fileInfo)) {fileList.remove(fileInfo);docChooseMap.put(groupList.get(groupPosition), fileList);fileCheckBox.setChecked(false);} else {fileList.add(fileInfo);docChooseMap.put(groupList.get(groupPosition), fileList);fileCheckBox.setChecked(true);}return true;}});}
}

4.其他Framgnt页面获取了手机系统文件

package com.example.wenjianshibie.Fragment;import android.annotation.SuppressLint;import android.os.Environment;
import android.view.View;
import android.widget.AdapterView;
import android.widget.CheckBox;
import android.widget.ListView;import com.example.wenjianshibie.Adapter.OtherAdapter;
import com.example.wenjianshibie.Base.FileInfo;
import com.example.wenjianshibie.Gongjulei.FileUtils;
import com.example.wenjianshibie.R;import java.io.File;
import java.io.FileFilter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;import io.reactivex.Observable;
import io.reactivex.ObservableSource;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.functions.Consumer;
import io.reactivex.functions.Function;
import io.reactivex.schedulers.Schedulers;/*** 4.其他Fragment*/
public class OtherFragment extends BaseFileFragment {private String mCurrentDir = Environment.getExternalStorageDirectory().getAbsolutePath();private final String rootDir = Environment.getExternalStorageDirectory().getPath();private List<FileInfo> fileInfoList = new ArrayList<>();private Set<String> chooseSet = new HashSet<>();private Map<String, FileInfo> temp = new HashMap<>();private List<FileInfo> chooseFiles = new ArrayList<>();private OtherAdapter otherAdapter;private ListView otherListView;public OtherFragment() {}@Overridepublic int getLayoutResource() {return R.layout.fragment_other;}@Overridepublic void initView(View view) {otherListView = view.findViewById(R.id.listview);otherAdapter = new OtherAdapter(getActivity(), fileInfoList, chooseSet);otherListView.setAdapter(otherAdapter);loadData();setOnClick();}@SuppressLint("CheckResult")private void loadData() {Observable.just(mCurrentDir).subscribeOn(Schedulers.io()).flatMap(new Function<String, ObservableSource<List<FileInfo>>>() {@Overridepublic ObservableSource<List<FileInfo>> apply(String path) throws Exception {File currentDir = new File(path);File[] files = currentDir.listFiles(filter);List<FileInfo> infos = new ArrayList<>(files == null ? 1 : files.length);if (files != null)for (File file : files) {FileInfo info = FileUtils.getFileInfoFromFile(file);info.setFileSize(file.isDirectory() ? "" : FileUtil.getFileSizeUnit(file.length()));infos.add(info);}Collections.sort(infos, comparator);if (!mCurrentDir.equals(rootDir)) {FileInfo fileInfo = new FileInfo();fileInfo.setFileName("..");fileInfo.setFilePath(currentDir.getParent());fileInfo.setFileSize("上层文件夹");fileInfo.setDirectory(true);fileInfo.setTime("");infos.add(0, fileInfo);}return Observable.just(infos);}}).observeOn(AndroidSchedulers.mainThread()).subscribe(new Consumer<List<FileInfo>>() {@Overridepublic void accept(List<FileInfo> fileInfos) throws Exception {fileInfoList.clear();fileInfoList.addAll(fileInfos);otherAdapter.notifyDataSetChanged();}});}private FileFilter filter = new FileFilter() {@Overridepublic boolean accept(File file) {return !file.isHidden();}};private Comparator<FileInfo> comparator = new Comparator<FileInfo>() {@Overridepublic int compare(FileInfo f1, FileInfo f2) {if (f1.isDirectory() && f2.isDirectory())return f1.getFileName().compareToIgnoreCase(f2.getFileName());if (!f1.isDirectory() && !f2.isDirectory())return f1.getFileName().compareToIgnoreCase(f2.getFileName());return f1.isDirectory() ? -1 : 1;}};private void setOnClick() {otherListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position, long id) {FileInfo fileInfo = fileInfoList.get(position);String path = fileInfo.getFilePath();if (fileInfo.isDirectory()) {mCurrentDir = path;OtherFragment.this.loadData();} else {CheckBox fileCheckBox = view.findViewById(R.id.fileCheckBox);if (chooseSet.contains(path)) {chooseSet.remove(path);chooseFiles.remove(temp.get(path));fileCheckBox.setChecked(false);} else {chooseSet.add(path);FileInfo addInfo = temp.get(path);if (addInfo == null) {addInfo = fileInfo;temp.put(path, addInfo);}chooseFiles.add(addInfo);fileCheckBox.setChecked(true);}}}});}
}

二、下面会主要复制一些重要性的代码可以用于参考.
由于代码量实在太大了，粘出来看的会很麻烦最后会附上源码路径哦. 下载下来就可以跑起来的非常方便的.
主要代码就是这个工具类，看不懂的可以在最后下载源码哦，这是是对文件识别做过优化的，因为这个东西之前就写好了，由于文件量大的话加载速度会特别慢所以对其进行了优化处理，之前将近加载一分钟，现在三到五秒就可以了。

package com.example.wenjianshibie.Gongjulei;import android.app.Activity;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.provider.MediaStore;
import android.util.Log;import androidx.annotation.RequiresApi;
import androidx.fragment.app.FragmentActivity;import com.example.wenjianshibie.Base.FileInfo;import java.io.File;
import java.util.ArrayList;
import java.util.List;/*** 1.文件识别工具类*/public class FileInfoManager {//1.获取单个文件类型public static final String TEXT = "txt";public static final String WORD = "doc";public static final String EXCEL = "xls";public static final String PPT = "ppt";public static final String PDF = "pdf";public static final String XML = "xml";public static final String HTML = "html";//2.获取文件配置方法final String[] DOC_PROJECTION = {MediaStore.Images.Media._ID,MediaStore.Images.Media.DATA,MediaStore.Files.FileColumns.MIME_TYPE,MediaStore.Files.FileColumns.SIZE,MediaStore.Files.FileColumns.TITLE};//初始化private FileInfoManager instance;//实体类private FileInfo fileInfo;private List<FileInfo> otherFile;private List<List<FileInfo>> otherlists;private ArrayList<List<FileInfo>> doclists;//构造方法public FileInfoManager getInstance() {if (null == instance) {instance = new FileInfoManager();}return instance;}//查找external多媒体文件@RequiresApi(api = Build.VERSION_CODES.KITKAT)public List<FileInfo> getMediaFiles(Activity cxt, Uri uri) {try (Cursor mCursor = cxt.getContentResolver().query(uri, new String[]{MediaStore.Audio.Media.DATA}, null, null, " date_modified desc")) {int count = mCursor.getCount();List<FileInfo> data = new ArrayList<>();if (count > 0) {if (mCursor.moveToFirst()) {do {String path = mCursor.getString(0);if (FileUtils.isFileExist(path)) {File file = new File(path);fileInfo = new FileInfo();fileInfo.setFileName(file.getName());Log.i("文件1：---", file.getName());fileInfo.setFilePath(file.getAbsolutePath());if (!file.isDirectory()) {fileInfo.setFileSize(String.valueOf(file.length()));fileInfo.setTime(DateUtil.getDateTime(file.lastModified()));String exspansion = FileUtils.getExspansion(file.getName());fileInfo.setExspansion(exspansion);}}data.add(fileInfo);} while (mCursor.moveToNext());}return data;} else {return data;}} catch (Exception e) {e.printStackTrace();}return null;}//    String selection = MediaStore.Files.FileColumns.MIME_TYPE + "= ? "//                               + " or " + MediaStore.Files.FileColumns.MIME_TYPE + " = ? "//                               + " or " + MediaStore.Files.FileColumns.MIME_TYPE + " = ? "//                               + " or " + MediaStore.Files.FileColumns.MIME_TYPE + " = ? "//                               + " or " + MediaStore.Files.FileColumns.MIME_TYPE + " = ? ";////    String[] selectionArgs = new String[]{"text/plain", "application/msword", "application/pdf", "application/vnd.ms-powerpoint", "application/vnd.ms-excel"};//查找external多媒体文件@RequiresApi(api = Build.VERSION_CODES.KITKAT)private List<FileInfo> getFilesByType(Activity cxt, String fileType) {List<FileInfo> data = new ArrayList<>();try (Cursor mCursor = cxt.getContentResolver().query(MediaStore.Files.getContentUri("external"), new String[]{MediaStore.Files.FileColumns.DATA, MediaStore.Files.FileColumns.DATE_ADDED, MediaStore.Files.FileColumns.SIZE, MediaStore.Files.FileColumns.TITLE}, MediaStore.Files.FileColumns.MIME_TYPE + " = ? ", new String[]{FileType.getFileOpenProgramByType(fileType)}, " date_modified desc")) {int count = mCursor.getCount();if (count > 0) {while (mCursor.moveToNext()) {String path = mCursor.getString(mCursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns.DATA));int time = mCursor.getInt(mCursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns.DATE_ADDED));int size = mCursor.getInt(mCursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns.SIZE));File file = new File(path);if (!file.exists())continue;fileInfo = new FileInfo();fileInfo.setFileName(file.getName());Log.i("文件2：---", file.getName());fileInfo.setFilePath(file.getAbsolutePath());if (!file.isDirectory()) {fileInfo.setFileSize(String.valueOf(size));
//                        fileInfo.setTime(DateUtil.getDateTime(time));fileInfo.setExspansion(FileUtils.getExspansion(file.getName()));}data.add(fileInfo);}}} catch (Exception e) {e.printStackTrace();}return data;}@RequiresApi(api = Build.VERSION_CODES.KITKAT)public synchronized List<List<FileInfo>> getDocFiles(FragmentActivity activity) {List<FileInfo> mTxtDocuments = getFilesByType(activity, TEXT);List<FileInfo> mDocDocuments = getFilesByType(activity, WORD);List<FileInfo> mXlsDocuments = getFilesByType(activity, EXCEL);List<FileInfo> mPptDocuments = getFilesByType(activity, PPT);List<FileInfo> mPdfDocuments = getFilesByType(activity, PDF);List<FileInfo> mXmlDocuments = getFilesByType(activity, XML);List<FileInfo> mHtmlDocuments = getFilesByType(activity, HTML);doclists = new ArrayList<>();doclists.add(mTxtDocuments);doclists.add(mDocDocuments);doclists.add(mXlsDocuments);doclists.add(mPptDocuments);doclists.add(mPdfDocuments);doclists.add(mXmlDocuments);doclists.add(mHtmlDocuments);return doclists;}/*** 扫描文件** @param activity* @return*/public List<List<FileInfo>> scanFilet(FragmentActivity activity) {List<FileInfo> mTxtDocuments = new ArrayList<>();List<FileInfo> mDocDocuments = new ArrayList<>();List<FileInfo> mXlsDocuments = new ArrayList<>();List<FileInfo> mPptDocuments = new ArrayList<>();List<FileInfo> mPdfDocuments = new ArrayList<>();List<FileInfo> mXmlDocuments = new ArrayList<>();List<FileInfo> mHtmlDocuments = new ArrayList<>();doclists = new ArrayList<>();//QYJ优化文件加载final String[] projection = DOC_PROJECTION;Uri uri = MediaStore.Files.getContentUri("external");//一些能通过mime_type查询出来的文档 .doc .pdf .txt .apkString selection = "(" + MediaStore.Files.FileColumns.DATA + " LIKE '%.txt'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.log'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.java'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.doc'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.docx'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.rtf'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.xls'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.xlsx'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.ppt'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.pptx'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.pdf'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.xml'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.html'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.htm'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.xhtml'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.json'" + ")";String[] selectionArgs = null;final Cursor c = activity.getContentResolver().query(uri,projection,selection,selectionArgs,MediaStore.Files.FileColumns.DATA);int count = c.getColumnIndex(MediaStore.Files.FileColumns.DATA);while (c.moveToNext()) {String path = c.getString(count);File file = new File(path);if (!file.exists())continue;fileInfo = new FileInfo();fileInfo.setFileName(file.getName());Log.i("文件3：---", file.getName());fileInfo.setFilePath(file.getAbsolutePath());if (!file.isDirectory()) {fileInfo.setFileSize(String.valueOf(file.length()));
//                fileInfo.setTime(DateUtil.getDateTime(file.lastModified()));fileInfo.setExspansion(FileUtils.getExspansion(file.getName()));}if (FileUtils.checkSuffix(path, new String[]{"txt", "log", "java"})) {mTxtDocuments.add(fileInfo);} else if (FileUtils.checkSuffix(path, new String[]{"doc", "docx", "dot", "rtf", "wps"})) {mDocDocuments.add(fileInfo);} else if (FileUtils.checkSuffix(path, new String[]{"xls", "xlsx"})) {mXlsDocuments.add(fileInfo);} else if (FileUtils.checkSuffix(path, new String[]{"ppt", "pptx"})) {mPptDocuments.add(fileInfo);} else if (FileUtils.checkSuffix(path, new String[]{"pdf"})) {mPdfDocuments.add(fileInfo);} else if (FileUtils.checkSuffix(path, new String[]{"xml"})) {mXmlDocuments.add(fileInfo);} else if (FileUtils.checkSuffix(path, new String[]{"html", "htm", "xhtml", "json"})) {mHtmlDocuments.add(fileInfo);}}doclists.add(mTxtDocuments);doclists.add(mDocDocuments);doclists.add(mXlsDocuments);doclists.add(mPptDocuments);doclists.add(mPdfDocuments);doclists.add(mXmlDocuments);doclists.add(mHtmlDocuments);return doclists;}public List<List<FileInfo>> geDocListFile() {return doclists;}public List<List<FileInfo>> getOtherListFile() {return otherlists;}
}

三、主要代码优化模块是下面这一块，也不算优化吧，只是指定的去查询就会节省很多时间，如果我们想查别的也可以在这个模块的基础上去修改，这边只提供了一个模型。

 //一些能通过mime_type查询出来的文档 .doc .pdf .txt .apkString selection = "(" + MediaStore.Files.FileColumns.DATA + " LIKE '%.txt'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.log'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.java'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.doc'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.docx'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.rtf'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.xls'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.xlsx'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.ppt'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.pptx'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.pdf'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.xml'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.html'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.htm'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.xhtml'" +" or " + MediaStore.Files.FileColumns.DATA + " LIKE '%.json'" + ")";String[] selectionArgs = null;

四、源码模型已经搭好了，可以在这个模块的基础上进行修改，下面附上源码地址：点这里提取码：k1tf

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