The Simple File Manager implementation method of Android development _android

This article illustrates the simple File Manager implementation approach for Android development. Share to everyone for your reference, specific as follows:

Here using Java I/O, listactivity, Dialog, bitmap and so on to implement a simple File manager, you can view the directory file, modify the file name, delete the file, open the file. Relatively simple, look directly at the code:

Look at the layout file first:

Layout/main.xml

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android=
"http://schemas.android.com/apk/" Res/android "
 android:orientation=" vertical "
 android:layout_width=" fill_parent "
 android:layout_" height= "Fill_parent"
 >
<listview
 android:id= "@android: Id/list
 " Android:layout_width= " Wrap_content "
 android:layout_height=" wrap_content "
 />
</LinearLayout>

File List layout:

Layout/file.xml

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android=
"http://schemas.android.com/apk/" Res/android "
 android:orientation=" horizontal "
 android:layout_width=" fill_parent "
 android:layout_" height= "Fill_parent"
 >
<imageview
 android:id= "@+id/imageview" android:layout_width= "wrap"
 _content "
 android:layout_height=" wrap_content "
/>
<textview android:id=
 " @+id/textview "
 android:layout_width=" wrap_content "
 android:layout_height=" wrap_content "
 android:textsize=" 14sp ">
</TextView>
</LinearLayout>

Modify File Name dialog box layout file:

Layout/rename_dialog.xml

<?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 ">
 < EditText
  android:id= "@+id/edittext"
  android:layout_width= "Match_parent"
  Wrap_content "
 />
</LinearLayout>

Main activity:

public class Mainactivity extends Listactivity {private static final String Root_path = "/";
 Store file name private arraylist<string> names = null;
 Store file path private arraylist<string> paths = null;
 Private view view;
 Private EditText EditText; /** called the activity is a.
  * * @Override public void onCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);
  Setcontentview (R.layout.main);
 Displays a list of files Showfiledir (Root_path);
  private void Showfiledir (String path) {names = new arraylist<string> ();
  paths = new arraylist<string> ();
  File File = new file (path);
  file[] files = file.listfiles (); If the current directory is not a root if (!
   Root_path.equals (PATH)) {Names.add ("@1");
   Paths.add (Root_path);
   Names.add ("@2");
  Paths.add (File.getparent ());
   //Add all files for (file f:files) {Names.add (F.getname ());
  Paths.add (F.getpath ());
 } this.setlistadapter (New Myadapter (This,names, paths)); } @Override protected void onListitemclick (ListView L, View v, int position, long id) {String path = paths.get (position);
  File File = new file (path); The file exists and is readable if (file.exists () && file.canread ()) {if (File.isdirectory ()) {//Display subdirectories and files Showfiledir (path
   );
   else{//Processing files filehandle (file);
   }//No permissions else{Resources res = getresources (); New Alertdialog.builder (this). Settitle (' message '). Setmessage (Res.getstring (r.string.no_permission)).
    Setpositivebutton ("OK", new Onclicklistener () {@Override public void OnClick (Dialoginterface dialog, int which) {
  ). Show ();
 } super.onlistitemclick (L, V, position, id); //Add a deletion to the file private void FileHandle (final file file) {Onclicklistener listener = new Dialoginterface.onclicklistener ( {@Override public void OnClick (Dialoginterface dialog, int which) {//Open file if (which = = 0) {Openfil
    E (file); ///modify filename else if (which = 1) {Layoutinflater factory = LAYOUTINFLAter.from (Mainactivity.this);
     View = Factory.inflate (R.layout.rename_dialog, NULL);
     EditText = (edittext) View.findviewbyid (R.id.edittext);
     Edittext.settext (File.getname ()); Onclicklistener listener2 = new Dialoginterface.onclicklistener () {@Override public void OnClick (Dialoginterf Ace dialog, int which) {//TODO auto-generated method stub String modifyname = Edittext.gettext (). ToString (
       );
       Final String Fpath = File.getparentfile (). GetPath ();
       Final File newFile = new file (Fpath + "/" + modifyname); if (newfile.exists ()) {//Exclude no modification if (!modifyname.equals (File.getname ())) {New Alertdialog.builde
         R (mainactivity.this). Settitle ("Note!") . Setmessage ("FileName already exists, does it overwrite?") "). Setpositivebutton (" OK ", new Dialoginterface.onclicklistener () {@Override public void OnC Lick (dialoginterface dialog, int which) {if (File.renameto (NewFile)) {ShowfilediR (Fpath); Displaytoast ("Rename succeeded!")
           "); } else{displaytoast (rename failed!)
           ");
          }}). Setnegativebutton ("Cancel", new Dialoginterface.onclicklistener () {@Override
        public void OnClick (Dialoginterface dialog, int which) {}}). Show ();
         } else{if (File.renameto (NewFile)) {Showfiledir (Fpath); Displaytoast ("Rename succeeded!")
        "); } else{displaytoast (rename failed!)
        ");
     }
       }
      }
     };
     Alertdialog Renamedialog = new Alertdialog.builder (mainactivity.this). Create ();
     Renamedialog.setview (view);
     Renamedialog.setbutton ("OK", listener2); Renamedialog.setbutton2 ("Cancel", new Dialoginterface.onclicklistener () {@Override public void OnClick (Dialoginte
     Rface dialog, int which) {//TODO auto-generated Method stub}});
    Renamedialog.show (); ///delete file Else{new Alertdialog.builder (mainactivity.this). Settitle ("Note!") . setmessage (Are you sure you want to delete this file?) "). Setpositivebutton (" OK ", new Dialoginterface.onclicklistener () {@Override public void OnClick (Dialogi
        Nterface dialog, int which) {if (File.delete ()) {//update file list Showfiledir (File.getparent ()); Displaytoast ("Delete succeeded!")
       "); } else{displaytoast (delete failed!)
       "); }}). Setnegativebutton ("Cancel", new Dialoginterface.onclicklistener () {@Override public void
    OnClick (dialoginterface dialog, int which) {}}). Show ();
  }
   }
  };
  When you select a file, eject and Delete the Action Options dialog box string[] menu = {"Open file", "rename", "Remove file"};
  New Alertdialog.builder (Mainactivity.this). Settitle ("Please select the action you want to do!") . Setitems (menu, Listener). Setpositivebutton ("Cancel", new Dialoginterface.onclicklistener () {@Override public void O
 Nclick (dialoginterface dialog, int which) {}}). Show (); //Open files private void OpenFile (file file){Intent Intent = new Intent ();
  Intent.addflags (Intent.flag_activity_new_task);
  Intent.setaction (Android.content.Intent.ACTION_VIEW);
  String type = getmimetype (file);
  Intent.setdataandtype (uri.fromfile (file), type);
 StartActivity (Intent);
  //Gets the file MimeType private string getmimetype (file file) {String type = "";
  String name = File.getname ();
  File name extension String end = name.substring (Name.lastindexof (".") + 1, name.length ()). toLowerCase ();
  if (End.equals ("m4a") | | | end.equals ("MP3") | | end.equals ("WAV")) {type = "audio";
  else if (end.equals ("mp4") | | | end.equals ("3gp")) {type = "video"; else if (end.equals ("jpg") | | end.equals ("PNG") | | end.equals ("JPEG") | | end.equals ("BMP") | | end.equals ("GIF")) {T
  ype = "image";
  else {//If it cannot be opened directly, the Jump List is selected by the user type = "*";
  Type = = "/*";
 return type;
 private void Displaytoast (String message) {Toast.maketext (mainactivity.this, message, Toast.length_short). Show ();

 }
}

Custom Adapters:

public class Myadapter extends baseadapter{private layoutinflater inflater;
 Private Bitmap Directory,file;
 Store file name private arraylist<string> names = null;
 Store file path private arraylist<string> paths = null;
  Parameter initialization public Myadapter (context context,arraylist<string> na,arraylist<string> pa) {names = NA;
  paths = PA;
  Directory = Bitmapfactory.decoderesource (Context.getresources (), R.DRAWABLE.D);
  File = Bitmapfactory.decoderesource (Context.getresources (), R.DRAWABLE.F);
  Shrink Picture directory = Small (directory,0.16f);
  File = Small (file,0.1f);
 Inflater = Layoutinflater.from (context);
 @Override public int GetCount () {//TODO auto-generated a stub return names.size ();
 @Override public Object getitem (int position) {//TODO auto-generated Method stub return Names.get (position);
 @Override public long getitemid (int position) {//TODO auto-generated method stub return position; @Override public View getview (int positioN, View Convertview, ViewGroup parent) {//TODO auto-generated method stub viewholder holder;
   if (null = = Convertview) {Convertview = inflater.inflate (r.layout.file, NULL);
   Holder = new Viewholder ();
   Holder.text = (TextView) Convertview.findviewbyid (R.id.textview);
   Holder.image = (ImageView) Convertview.findviewbyid (R.id.imageview);
  Convertview.settag (holder);
  else {holder = (Viewholder) convertview.gettag ();
  File F = new file (paths.get (position). ToString ());
   if (Names.get (position). Equals ("@1")) {Holder.text.setText ("/");
  Holder.image.setImageBitmap (directory);
   else if (names.get (position). Equals ("@2")) {Holder.text.setText ("..");
  Holder.image.setImageBitmap (directory);
   } else{Holder.text.setText (F.getname ());
   if (F.isdirectory ()) {holder.image.setImageBitmap (directory);
   else if (F.isfile ()) {holder.image.setImageBitmap (file);
   } else{System.out.println (F.getname ()); } return CONVERTVIew
  Private class viewholder{private TextView text;
 Private ImageView image;
  Private Bitmap Small (Bitmap map,float num) {Matrix matrix = new Matrix ();
  Matrix.postscale (num, num);
 Return Bitmap.createbitmap (Map,0,0,map.getwidth (), Map.getheight (), matrix,true);

 }
}

Because you want to manipulate the file, authorize it in the description file:

<?xml version= "1.0" encoding= "Utf-8"?> <manifest xmlns:android=
"http://schemas.android.com/apk/res/" Android "
  package=" Com.test.filemanager "
  android:versioncode=" 1 "
  android:versionname=" 1.0 ">
 <uses-sdk android:minsdkversion= "/>
 <strong> <uses-permission android:name=" Android.permission.MOUNT_UNMOUNT_FILESYSTEMS "/>
 <uses-permission android:name=" Android.permission.WRITE_EXTERNAL_STORAGE "/></strong>
 <application android:icon=" @drawable/icon "Android:label=" @string/app_name ">
  <activity android:name=". Mainactivity "
     android:label=" @string/app_name ">
   <intent-filter>
    <action android:name = "Android.intent.action.MAIN"/>
    <category android:name= "Android.intent.category.LAUNCHER"/>
   </intent-filter>
  </activity>
 </application>
</manifest>

The results of the operation are as follows:

View catalog Files

File Rename:

To delete a file:

Open File:

I hope this article will help you with the Android program.