Android编写简易文件管理模块

<?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="match_parent"
 android:orientation="vertical">

 <horizontalscrollview
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:scrollbars="none">

 <linearlayout
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:orientation="horizontal"
 android:id="@+id/lypath">

 <textview
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:textappearance="?android:textappearance"
 android:text="@string/txt_path_now"/>

 <textview
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:textappearance="?android:textappearance"
 android:text="mnt/sdcard"
 android:id="@+id/txtpath"/>

 </linearlayout>
 </horizontalscrollview>

 <view
 android:layout_width="match_parent"
 android:layout_height="1dp"
 android:background="@android:color/darker_gray"/>

 <linearlayout
 android:layout_width="match_parent"
 android:layout_height="0dp"
 android:layout_weight="1">

 <listview
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:id="@+id/folderlist"/>

 </linearlayout>
</linearlayout>

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:orientation="vertical">

 <linearlayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:orientation="horizontal"
 android:scaley="0.9">

 <checkbox
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:focusable = "false"
 android:focusableintouchmode="false"
 android:id="@+id/cbselect"/>

 <imageview
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/img"
 android:src="@mipmap/other"
 tools:ignore="contentdescription" />

 <linearlayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:orientation="vertical">

 <textview
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:textappearance="?android:textappearance"
 android:id="@+id/name"
 android:text="setting"/>

 <linearlayout
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="horizontal">

 <textview
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:id="@+id/time"
  android:text="2017-3-30 21:40:02"/>

 <view
  android:layout_width="20dp"
  android:layout_height="match_parent"/>

 <textview
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:id="@+id/size"
  android:text="1.2mb"/>

 </linearlayout>

 </linearlayout>

 </linearlayout>

 <view
 android:layout_width="match_parent"
 android:layout_height="1dp"
 android:background="@android:color/darker_gray"/>

</linearlayout>

package czhy.grey.sun.exam.bin.adapter_;

import android.content.context;
import android.view.layoutinflater;
import android.view.view;
import android.view.viewgroup;
import android.widget.baseadapter;
import android.widget.checkbox;

import java.io.file;
import java.text.decimalformat;
import java.text.simpledateformat;
import java.util.arraylist;
import java.util.hashmap;

import czhy.grey.sun.exam.r;
import czhy.grey.sun.exam.bin.holder_.fileholder;

public class fileadapter extends baseadapter {
 private arraylist<file> list;
 private layoutinflater inflater;
 private boolean isroot;
 // 用来控制checkbox的选中状况
 private hashmap<integer, boolean> isselected;
 private int selectnum;

 public fileadapter(context context, arraylist<file> list,boolean isroot) {
 this.list = list;
 this.isroot = isroot;
 inflater = layoutinflater.from(context);
 isselected = new hashmap<>();
 // 初始化数据
 initdate();
 }

 @override
 public int getcount() {
 return list.size();
 }

 @override
 public file getitem(int position) {
 return list.get(position);
 }

 @override
 public long getitemid(int position) {
 return position;
 }

 @override
 public view getview(int position, view convertview, viewgroup parent) {
 fileholder holder;
 file file = getitem(position);

 if (convertview == null) {
 convertview = inflater.inflate(r.layout.list_file_style, parent, false);
 holder = new fileholder(convertview);
 convertview.settag(holder);
 } else {
 holder = (fileholder) convertview.gettag();
 }
 // todo: 2017/4/1 根目录ui优化
 if (!isroot && position == 0) {
 holder.setname("返回上一层", file.isdirectory(),isselectedfor(position));
 holder.setid(position,isselectedfor(position),new view.onclicklistener() {
 @override
 public void onclick(view v) {
  int position = (int) v.gettag();
  boolean b = !isselected.get(position);

  isselected.put(position, b);
  ((checkbox) v).setchecked(b);
  //全选或全取消操作
  for(int i=0;i< getcount();i++){
  setchecked(i,b);
  }
  selectnum = b?getcount():0;

  notifydatasetchanged();
 }
 });
 holder.settime("全选");
 holder.setsize("已选择"+selectnum+"项");
 } else {
 holder.setname(file.getname(), file.isdirectory(),isselectedfor(position));
 holder.setid(position,isselectedfor(position),new view.onclicklistener() {
 @override
 public void onclick(view v) {
  int position = (int) v.gettag();
  boolean b = !isselectedfor(position);
  isselected.put(position, b);
  ((checkbox) v).setchecked(b);
  //是否已经全选
  if(isselectedall()) {
  isselected.put(0, true);
  selectnum = getcount();
  }else {
  isselected.put(0, false);
  selectnum = b?selectnum+1:selectnum-1;
  }

  notifydatasetchanged();
 }
 });
 holder.settime(new simpledateformat("yyyy/mm/hh/dd hh:mm:ss").format(file.lastmodified()));

 if (file.isfile())
 holder.setsize(filelength(file.length()));
 else {
 holder.setsize("");
 }
 }

 return convertview;
 }

 public boolean isselectedfor(int id) {
 return isselected.get(id);
 }

 public int getselectnum() {
 return selectnum;
 }

 //私有函数
 /** 初始化isselected的数据
 */
 private void initdate() {
 selectnum = 0;
 for (int i = 0; i < list.size(); i++) {
 isselected.put(i, false);
 }
 }

 private void setchecked(int id,boolean ischecked) {
 isselected.put(id,ischecked);
 }

 private string filelength(long length) {
 string size;

 if (length > 1024 * 1024)
 size = new decimalformat("#.00").format(length / (1024.0 * 1024.0)) + "mb";
 else if (length > 1024)
 size = new decimalformat("#.00").format(length / 1024.0) + "kb";
 else
 size = length + "b";

 return size;
 }

 private boolean isselectedall(){
 for(int i=1;i< getcount();i++){
 if(!isselectedfor(i))
 return false;
 }

 return true;
 }

}

package czhy.grey.sun.exam.bin.holder_;


import android.view.view;
import android.widget.checkbox;
import android.widget.imageview;
import android.widget.textview;

import czhy.grey.sun.exam.r;

public class fileholder{

 private checkbox cbselect;
 private textview name;
 private textview time;
 private textview size;
 private imageview img;

 public fileholder(view convertview) {
 cbselect = (checkbox)convertview.findviewbyid(r.id.cbselect);
 name = (textview)convertview.findviewbyid(r.id.name);
 time = (textview)convertview.findviewbyid(r.id.time);
 img = (imageview)convertview.findviewbyid(r.id.img);
 size = (textview)convertview.findviewbyid(r.id.size);
 }

 public void settime(string time) {
 this.time.settext(time);
 }

 public void setid(int id,boolean isselected, view.onclicklistener listener) {
 cbselect.settag(id);
 cbselect.setchecked(isselected);
 cbselect.setonclicklistener(listener);
 }

 public void setname(string name,boolean isdirectory,boolean ischecked) {
 this.name.settext(name);
 cbselect.setchecked(ischecked);
 if (isdirectory) {
 if(name.equalsignorecase("返回上一层")){
 img.setimageresource(r.mipmap.back);
 }else
 img.setimageresource(r.mipmap.folder);
 }else {
 string type = name.substring(name.lastindexof(".")+1,name.length());

 if ((type.equalsignorecase("doc") || type.equalsignorecase("docx") || type.equalsignorecase("txt"))) {
 img.setimageresource(r.mipmap.doc_text);
 } else {
 img.setimageresource(r.mipmap.other);
 }
 }
 }

 public void setsize(string size) {
 this.size.settext(size);
 }
}

 private listview folderlist;
 private textview txtpath;
 private fileadapter fileadapter;
 private arraylist<file> rootfilelist;
 private boolean isrootnow;

 private void getrootfile(){
 rootfilelist = new arraylist<>();
 storagemanager storagemanager = (storagemanager) this.getsystemservice(storage_service);
 try {
 //内部存储器
 file inside = null;
 //可移除存储器集合
 arraylist<file> outside = new arraylist<>();

 //获取存储器接口 api-24以下不支持storagevolume接口
 //api-24开始可直接 list<storagevolume> svlist = storagemanager.getstoragevolumes();
 method getvolumelist = storagemanager.class.getmethod("getvolumelist");
 getvolumelist.setaccessible(true);
 //获取存储器列表
 object[] invokes = (object[]) getvolumelist.invoke(storagemanager);
 if (invokes != null) {
 for (object obj:invokes) {
  //获取存储器地址接口
  method getpath = obj.getclass().getmethod("getpath");
  //获取存储器地址
  string path = (string) getpath.invoke(obj);
  file file = new file(path);
  if (file.canwrite()) {
  //获取存储器是否可移除接口
  method isremovable = obj.getclass().getmethod("isremovable");
  //存储器是否可移除
  if((isremovable.invoke(obj)).equals(true)){
  outside.add(file);
  }else {
  inside = file;
  }
  }
 }
 //按0-内部存储器 >0外部存储器 顺序 添加到根目录列表
 rootfilelist.add(inside);
 rootfilelist.addall(outside);
 }
 } catch (nosuchmethodexception |
 illegalargumentexception |
 illegalaccessexception |
 invocationtargetexception e1) {
 e1.printstacktrace();
 }
 }

 //获取目录数据
 private void refurbish(file folder) {
 txtpath.settext(folder.getpath());
 arraylist<file> files = new arraylist<>();

 files.add(folder.getparentfile());

 file[] folderfile = folder.listfiles();
 if (null != folderfile && folderfile.length > 0) {
 for(file file:folderfile)
 files.add(file);
 }

 //新建集合用做打开文件夹
 arraylist<file> openedfolder = new arraylist<>();
 //获取第一个文件夹 上一级文件夹
 openedfolder.add(files.get(0));
 //移除 上一级文件夹 剩下为当前文件夹内容
 files.remove(0);
 //排序 文件夹在前，然后按文件名排序
 collections.sort(files, new comparator<file>() {
 @override
 public int compare(file f1, file f2) {
 if (f1.isdirectory()) {
  if (f2.isdirectory()) {
  return f1.getname().comparetoignorecase(f2.getname());
  } else {
  return -1;
  }
 } else if (f2.isdirectory()) {
  return 1;
 } else {
  return f1.getname().comparetoignorecase(f2.getname());
 }
 }
 });
 //将排序完毕的内容添加到目标集合 目的:解决第一个文件夹不是上一层地址问题
 openedfolder.addall(files);
 fileadapter = new fileadapter(this, openedfolder,folder.getparent() == null);
 folderlist.setadapter(fileadapter);
 isrootnow = false;
 } 

 //获取根目录数据
 private void rootfile() {
 txtpath.settext("/");
 fileadapter = new fileadapter(this, rootfilelist,true);
 folderlist.setadapter(fileadapter);
 isrootnow = true;
 }

 public boolean isrootfile(file file) {
 //经过两部不同的手机测试，这两个目录是可能的目录
 //如果不能正确返回可以自行测试
 //测试方法：输出父目录，然后在这里添加或修改即可
 return file.getparent().equalsignorecase("/") || file.getparent().equalsignorecase("/storage");
 }

@override
 protected void oncreate(bundle savedinstancestate) {
 super.oncreate(savedinstancestate);
 setcontentview(r.layout.activity_import);

 txtpath = (textview) findviewbyid(r.id.txtpath);
 folderlist = (listview) findviewbyid(r.id.folderlist);
 folderlist.setonitemclicklistener(new adapterview.onitemclicklistener() {
 @override
 public void onitemclick(adapterview<?> parent, view view, int position, long id) {
 file file = fileadapter.getitem(position);
 //因为为的程序中不需要对文件进行其他操作，所有不做处理
 //有需求的在这里添加else即可
 if (file.isdirectory()) {
  if (isrootnow)
  refurbish(file);
  else if (isrootfile(file))
  rootfile();
  else
  refurbish(file);
 }
 }
 });
 getrootfile();
 rootfile();
 }

 /**
 * 监听物理按键
 * 需要注意的是这个函数是有返回值的
 * 返回值可以理解为
 * true表示做了处理，就不提交给处理系统的back按键事件
 * false则是提交给系统处理
 */
 @override
 public boolean onkeydown(int keycode, keyevent event) {
 if ((keycode == keyevent.keycode_back && event.getrepeatcount() == 0)) {

 if (!isrootnow) {
 file file = fileadapter.getitem(0);
 if (isrootfile(file))
  rootfile();
 else
  refurbish(file);

 return true;
 } else {
 finish();
 }
 }

 return super.onkeydown(keycode, event);
 }