Android gets the file and cache path of the current program!

The main interface is to display two buttons to go to the file and cache directories respectively:

 

 

The program architecture is as follows:

 

 

Let's take a look at the main program code:

 

Public class filecacheactivity extends activity implements onclicklistener <br/>{< br/> private button mybutton1; <br/> private button mybutton2; <br/> private file cachedir; <br/> private file filedir; </P> <p>/** called when the activity is first created. */<br/> @ override <br/> Public void oncreate (bundle savedinstancestate) <br/>{< br/> super. oncreate (savedinstancestate); <br/> setcontentview (R. layout. main); </P> <p> mybutton1 = (button) findviewbyid (R. id. mybutton1); <br/> mybutton2 = (button) findviewbyid (R. id. mybutton2); </P> <p> mybutton1.setonclicklistener (this); <br/> mybutton2.setonclicklistener (this ); </P> <p>/** <br/> * obtain the current cache directory <br/> */<br/> cachedir = This. getcachedir (); </P> <p>/** <br/> * obtain the current file directory <br/> */<br/> filedir = This. getfilesdir (); <br/>}</P> <p>/* Call ex05_16_1 and pass the path to */<br/> private void showactivity (string path) <br/>{< br/> intent = new intent (); <br/> intent. setclass (filecacheactivity. this, filecachelistactivity. class); </P> <p> bundle = new bundle (); <br/> bundle. putstring ("path", PATH); <br/> intent. putextras (bundle); </P> <p> startactivity (intent ); <br/>}</P> <p> @ override <br/> Public void onclick (view V) <br/> {<br/> // todo auto-generated method stub <br/> int viewid = v. GETID (); <br/> switch (viewid) <br/>{< br/> case R. id. mybutton1: <br/>{< br/> string Path = filedir. getparent () + file. separator <br/> + filedir. getname (); <br/> showactivity (PATH); <br/> break; <br/>}< br/> case R. id. mybutton2: <br/>{< br/> string Path = cachedir. getparent () + file. separator <br/> + cachedir. getname (); <br/> showactivity (PATH); <br/> break; <br/>}< br/> default: <br/> break; <br/>}</P> <p>}

 

Then the code of the listview is displayed:

 

Public class filecachelistactivity extends activity implements <br/> onitemclicklistener <br/>{< br/> private list <string> items = NULL; <br/> private string path; <br/> private listview; </P> <p>/** called when the activity is first created. */<br/> Public void oncreate (bundle savedinstancestate) <br/>{< br/> super. oncreate (savedinstancestate); <br/> setcontentview (R. layout. mylist); </P> <P> listview = (listview) findviewbyid (R. id. list); <br/> listview. setonitemclicklistener (this); <br/>/** <br/> * Get bundle <br/> */<br/> bundle bunde = This. getintent (). getextras (); </P> <p>/** <br/> * obtain the data imported into the bundle on the previous page. <br/> */<br/> Path = bunde. getstring ("path"); </P> <p> This. settitle (PATH ); </P> <p>/** <br/> * use a new file directory to display all files in the directory. <br/> */<br/> File = new file (PATH ); <br/> Fill (file. list Files (); // list all files under this path <br/>}</P> <p> private void fill (file [] files) <br/>{< br/> items = new arraylist <string> (); <br/> If (Files = NULL) <br/>{< br/> return; <br/>}</P> <p>/* put the obtained file name into the arraylist */<br/> for (File file: files) <br/>{< br/> items. add (file. getname ()); <br/>}</P> <p>/* put arraylist into arrayadapter */<br/> arrayadapter <string> filelist = new arrayadapter <string> (this, <br/> Andro Id. r. layout. simple_list_item_1, items); <br/> listview. setadapter (filelist); <br/>}</P> <p> @ override <br/> Public void onitemclick (adapterview <?> L, view V, int position, long ID) <br/>{< br/> file = new file (path + file. separator + items. get (position); </P> <p> If (file. isdirectory () <br/>{< br/> Fill (file. listfiles (); <br/>}</P> <p >}< br/>

 

The last two XML files

Main. xml

<? XML version = "1.0" encoding = "UTF-8"?> <Br/> <linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android" <br/> Android: Orientation = "vertical" <br/> Android: layout_width = "fill_parent" <br/> Android: layout_height = "fill_parent" <br/> <button <br/> Android: id = "@ + ID/mybutton1" <br/> Android: layout_width = "fill_parent" <br/> Android: layout_height = "wrap_content" <br/> Android: TEXT = "@ string/strlist1" <br/> </button> <br/> <button <br/> Android: id = "@ + ID/mybutton2" <br/> Android: layout_width = "fill_parent" <br/> Android: layout_height = "wrap_content" <br/> Android: TEXT = "@ string/strlist2" <br/> </button> <br/> </linearlayout>

 

Mylist. xml

<? XML version = "1.0" encoding = "UTF-8"?> <Br/> <linearlayout <br/> xmlns: Android = "http://schemas.android.com/apk/res/android" <br/> Android: layout_width = "wrap_content" <br/> Android: layout_height = "wrap_content"> <br/> <listview <br/> Android: Id = "@ + ID/List" <br/> Android: layout_width = "fill_parent" <br/> Android: layout_height = "fill_parent" <br/> </listview> <br/> </linearlayout>

 

Finished!