Simple implementation browse files on Android SD card

----Main.java

public class main extends activity {private textview textview;private  button button;private listview listview;public file currentparentfile;public  file[] currentfiles;public static  string sdcarddir ;static {try {// The path of the SD card Sdcarddir = environment.getexternalstoragedirectory (). Getcanonicalpath ();}  catch  (ioexception e)  {e.printstacktrace ();}} @Overrideprotected  void oncreate (bundle savedinstancestate)  {super.oncreate ( Savedinstancestate); Setcontentview (R.layout.main);textview =  (TextView)  findviewbyid ( R.ID.TEXTVIEW1);button =  (Button)  findviewbyid (r.id.button1);listview =  (ListView)  findviewbyid (R.ID.LISTVIEW1); File root = new file (Sdcarddir); if (Root.exists ()) {currentparentfile = root; Currentfiles = root.listfiles (); Updatelistview (currentfiles);} ListView.setonitemclicklistener (New onitemclicklistener ()  {@Overridepublic  void onitemclick ( Adapterview<?> parent, view view,int position, long id)  {if  ( Currentfiles[position].isfile ()) return; File[] tmp = currentfiles[position].listfiles ();if  (tmp == null | |  tmp.length == 0)  {toast.maketext (main.this,  "The current path is invalid, or there is no file", Toast.length_short). Show ( );}  else {currentParentFile = currentFiles[position];currentFiles = tmp; Updatelistview (Currentfiles);}}); Button.setonclicklistener (New onclicklistener ()  {@Overridepublic  void onclick (View v)  {try {if  (!currentparentfile.getcanonicalpath (). Equals (Sdcarddir))  {currentparentfile  = currentparentfile.getparentfile (); Currentfiles = currentparentfile.listfiles (); Updatelistview (currentfiles);} Elsereturn;}  catch  (ioexception e) &NBsp {// todo auto-generated catch blocke.printstacktrace ();}});} Private void updatelistview (file[] files)  {List<Map<String, Object>>  itemps = new ArrayList<Map<String, Object>> (;for ) (int i  = 0; i < files.length; i++)  {map<string, object> listitem  = new HashMap<String, Object> ();if  (Files[i].isdirectory ()) listitem.put ("icon" ,  r.drawable.folder); Elselistitem.put ("icon",  r.drawable.file); Listitem.put ("name",  files[i]. GetName ()); Itemps.add (ListItem);} Simpleadapter simpleadapter = new simpleadapter (this, itemps,r.layout.listitem,  new string[] {  "icon",  "name"  }, new int[] {R.id.imageView1,  r.id.text }); Listview.setadapter (Simpleadapter); Try {textview.settext ("Current path is:" + Currentparentfile.getcanonicalpath ());} catch  (ioexception e)  {e.printstacktrace ();}} 

Layout file----main.xml

<relativelayout 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"     tools:context= "${ Relativepackage}.${activityclass} " >    <TextView         android:id= "@+id/textview1"         android:layout_ Width= "Wrap_content"         android:layout_height= "Wrap_content"          android:text= "Current path:"  />    <button         android:id= "@+id/button1"          android:layout_width= "Wrap_content"         android:layout_ height= "Wrap_content"   &Nbsp;     android:layout_alignparentbottom= "true"          android:layout_centerhorizontal= "true"         android:text = "Back to top level"  />    <ListView         Android:id= "@+id/listview1"         android:layout_width= "Match_parent"         android:layout_height= "Wrap_content"          android:layout_above= "@+id/button1"          Android:layout_alignparentleft= "true"         android:layout_below= "@+ Id/textview1 " >    </ListView></RelativeLayout>

Effect:

The layout of each bar of the ListView:

---listitem.xml

<?xml version= "1.0"  encoding= "Utf-8"? ><relativelayout xmlns:android= "http// Schemas.android.com/apk/res/android "    android:layout_width=" Match_parent "     android:layout_height= "Match_parent"  >    <ImageView         android:id= "@+id/imageview1"          android:layout_width= "Wrap_content"         android:layout_height = "Wrap_content"         android:layout_alignparentleft= "true"          android:layout_alignparenttop= "true"          android:src= "@drawable/ic_launcher"  />    <TextView         android:id= "@+id/text"          android:layout_width= "Wrap_content"         android:layout_height= "Wrap_content"          android:layout_alignparenttop= "true"          android:layout_margintop= "15DP"         android:layout_torightof= "@+id/ ImageView1 "        android:text=" TextView " /></ Relativelayout>

Demo Run Effect:

Simple implementation browse files on Android SD card