Andoid -- select the file directory

Layout file activity_main.xml of the main activity

<Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android"
Android: layout_width = "fill_parent"
Android: layout_height = "fill_parent"
Android: Orientation = "vertical">

<Button
Android: Id = "@ + ID/filedire_button1"
Android: layout_width = "match_parent"
Android: layout_height = "wrap_content"
Android: text = "select file"/>

<Textview
Android: Id = "@ + ID/filedire_textview1"
Android: layout_width = "match_parent"
Android: layout_height = "match_parent"
Android: text = ""/>

</Linearlayout>

The image is shown as follows:

The layout file Adapter. xml required to create the adapter

<? 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">

<Listview
Android: Id = "@ + ID/adapter_listview1"
Android: layout_width = "match_parent"
Android: layout_height = "wrap_content">
</Listview>

<Linearlayout
Android: layout_width = "match_parent"
Android: layout_height = "wrap_content"
Android: Orientation = "horizontal">

<Imageview
Android: Id = "@ + ID/adapter_image"
Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"
Android: layout_weight = "0.48"
Android: src = "@ drawable/ic_launcher"/>

<Textview
Android: Id = "@ + ID/adapter_filename"
Android: layout_width = "242dp"
Android: layout_height = "match_parent"
Android: text = "textview"/>
</Linearlayout>

</Linearlayout>

Main activity program mainactivity. Java

Package com. example. filedirec;

Import java. Io. file;
Import java. util. arraylist;
Import java. util. hashmap;
Import java. util. List;
Import java. util. Map;

Import Android. OS. Bundle;
Import Android. App. activity;
Import Android. App. alertdialog;
Import Android. App. alertdialog. Builder;
Import Android. content. dialoginterface;
Import Android. View. view;
Import Android. View. View. onclicklistener;
Import Android. widget. Button;
Import Android. widget. simpleadapter;
Import Android. widget. textview;

Public class mainactivity extends activity {
Private button choosefile;
Private textview filedire;
Private string curpath = new string ("/");

@ Override
Protected void oncreate (bundle savedinstancestate ){
Super. oncreate (savedinstancestate );
Setcontentview (R. layout. activity_main );

Choosefile = (button) findviewbyid (R. Id. filedire_button1 );
Filedire = (textview) findviewbyid (R. Id. filedire_textview1 );

Choosefile. setonclicklistener (New onclicklistener (){

@ Override
Public void onclick (view arg0 ){
// Todo auto-generated method stub
Opencurdir (curpath );
}
});
}

Private void opencurdir (string curpath ){
File F = new file (curpath );
File [] file = f. listfiles ();
Final list <Map <string, Object> listitem = new arraylist <Map <string, Object> ();

If (! Curpath. Equals ("/") {// Add this option to the list to be displayed if it is not the root directory
Map <string, Object> map1 = new hashmap <string, Object> ();
Map1.put ("name", "Back to the upper-level directory ");
Map1.put ("image", R. drawable. back02 );
Map1.put ("path", F. getparent ());
Map1.put ("isdire", true );
Listitem. Add (map1 );
}

If (file! = NULL) {// It must be determined. Otherwise, an error will be reported when the directory is empty.
For (INT I = 0; I <file. length; I ++ ){
Map <string, Object> map = new hashmap <string, Object> ();
Map. Put ("name", file [I]. getname ());
Map. Put ("image", (file [I]. isdirectory ())? R. drawable. Folder: r.drawable.doc );
Map. Put ("path", file [I]. getpath ());
Map. Put ("isdire", file [I]. isdirectory ());
Listitem. Add (MAP );
}
}

Simpleadapter adapter = new simpleadapter (mainactivity. This, listitem, R. layout. adapter,
New String [] {"name", "image"}, new int [] {R. Id. adapter_filename, R. Id. adapter_image });

Final alertdialog. Builder B = new Builder (mainactivity. This );
B. setadapter (adapter, new dialoginterface. onclicklistener (){

@ Override
Public void onclick (dialoginterface arg0, int arg1 ){
// Todo auto-generated method stub
If (Boolean) listitem. Get (arg1). Get ("isdire ")){
Opencurdir (string) listitem. Get (arg1). Get ("path "));
} Else {
Filedire. settext (string) listitem. Get (arg1). Get ("path "));
}
}
});
B. Show ();
}

}

The dialog box is displayed as follows:

Andoid -- select the file directory