Copy native Android File Manager

Modeled after the Android native File Manager, this is a simple demo that can be easily followed up by existing code, as follows:

First create a new Listview_item, learn the adapter students should know what to do this is to draw the interface of each list item, here with the icon + file name

Listview_item.xml

<span style= "FONT-SIZE:18PX;" ><?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:o rientation= "Horizontal" >        <imageview        android:id= "@+id/icon" android:layout_width= "Wrap_        Content "        android:layout_height=" wrap_content "/>        <textview         android:id=" @+id/name "        Android : textsize= "25sp"        android:layout_marginleft= "10DP"        android:layout_gravity= "center_vertical"        Android:textcolor= "#080808"        android:layout_width= "wrap_content"        android:layout_height= "Wrap_content" />            </LinearLayout></span>

And then we started writing about our main interface layout, the two-tiered linearlayout nesting

Activity_main.xml

<span style= "FONT-SIZE:18PX;" ><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=" Match_parent "Android:orien tation= "vertical" tools:context= "com.example.filemanagerdemo.MainActivity" > <linearlayout android:lay Out_width= "Fill_parent" android:layout_height= "wrap_content" android:orientation= "Horizontal" > &lt ; Button android:id= "@+id/parent" android:text= "return" android:background= "#00EE76" Androi D:layout_width= "Wrap_content" android:layout_height= "Wrap_content"/> <textview Android : id= "@+id/textview" android:layout_width= "wrap_content" android:layout_height= "Wrap_content" an droid:layout_weight= "1"/> </LinearLayout> <listview android:layout_width= "Wrap_content" an Droid:layout_height= "0DP" android:layout_margintop= "3DP" android:id= "@+id/listview" android:dividerheight= "1DP" android:layout_weight= "1" > </ListView></LinearLayout></span>

Well, now that the static interface is ready, here's the key to the main activity code to explain

Mainactivity.java

<span style= "FONT-SIZE:18PX;" >package com.example.filemanagerdemo;import java.io.file;import Java.io.ioexception;import java.util.ArrayList; Import Java.util.hashmap;import java.util.list;import Java.util.map;import Android.app.activity;import Android.os.bundle;import Android.os.environment;import Android.view.view;import Android.view.View.OnClickListener ; Import Android.widget.adapterview;import Android.widget.button;import Android.widget.listview;import Android.widget.simpleadapter;import Android.widget.textview;import Android.widget.toast;public class MainActivity Extends Activity {Private Button parent;p rivate listview ListView;p rivate TextView TextView;p rivate File currentparent    ; Records the parent folder of the current file private file[] currentfiles; @Overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_main); init ();} /* * Initialize control */private void init () {//TODO auto-generated method stubthis.parent = (Button) Findviewbyid (R.ID.Parent); This.listview = (ListView) Findviewbyid (R.id.listview); This.textview = (TextView) Findviewbyid (R.id.textview) ; File root = new file (Environment.getexternalstoragedirectory (). GetPath ()); if (Root.exists ()) {currentparent = root; Currentfiles = Root.listfiles (); Inflatelistview (currentfiles);} This.parent.setOnClickListener (New Onclicklistener () {@Overridepublic void OnClick (View v) {//TODO auto-generated Method Stubtry {if (!currentparent.getcanonicalfile (). Equals (Environment.getexternalstoragedirectory (). GetPath ())             {currentparent = Currentparent.getparentfile ();//Get parent Directory currentfiles = Currentparent.listfiles ();                             Get all the files in the current layer Inflatelistview (currentfiles); Update list}} catch (IOException e) {//TODO auto-generated catch Blocke.printstacktrace ();}}); This.listview.setOnItemClickListener (New Adapterview.onitemclicklistener () {@Overridepublic void Onitemclick ( Adapterview<?> parent, View view,int position, long ID) {//TODO auto-generated MethOd stub//If clicked is a file, do not do any processing if (Currentfiles[position].isfile ()) {return;} file[] temp = currentfiles[position].listfiles (); if (temp = = NULL | | temp.length = = 0) {Toast.maketext (Getapplicationcont Ext (), "This folder is unavailable or the folder is empty", Toast.length_long). Show ();; return;} Currentparent = Currentfiles[position]; currentfiles = temp; Inflatelistview (currentfiles);}) ;} /* * Update listview */private void Inflatelistview (file[] files) {//TODO auto-generated method Stublist<map<string,obj ect>> list = new arraylist<map<string, object>> (); for (int i = 0; i<files.length; i++) {map<string ,object> item= New hashmap<string, object> (), if (Files[i].isdirectory ()) {item.put ("icon", R.drawable.folder ) ;} else {item.put ("icon", r.drawable.file);//This can be written to add different icon}item.put ("name", Files[i].getname ()) According to the specific file type; List.add ( Item);} Simpleadapter adapter = new Simpleadapter (Getapplicationcontext (), List,r.layout.listview_item, new string[]{"icon", " Name "}, new Int[]{r.id.icon,r.id.name}); This.lisTview.setadapter (adapter); try{Textview.settext (Currentparent.getcanonicalpath ());  }catch (IOException e) {e.printstacktrace (); }}}</span>

The code should be easy to read from OnCreate. Ok, a copy of the Android native System File Manager demo on the development completed, this demo in order to let everyone see clearly, I used a very irregular writing habits, such as string should be put into string.xml, color also best not directly use RGB encoding, A new color.xml should be created under value to specify a name for this RGB encoding. Here in order to explain the principle of clarity, I have all used hard code, there is the way I get the root directory of the SD card is too simple rough, normal should write a method to judge all kinds of anomalies, such as determine whether there is an SD card or the current SD card is available, otherwise, once the user performs a bit of abnormal operation, our program will be This is the difference between a formal project and a demo.

OK that's all, there are errors, I hope the visitors can correct me.

I think it's a good thing.

Top!

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Or

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。

Copy native Android File Manager