android how do i crete folder and show on screen -

i'd create gallery folder in internal memory in screenshot below:

when click on album, want show list of images inside it.

string dirpath = getfilesdir().getabsolutepath() + file.separator + "newfoldername"; file projdir = new file(dirpath); 

for creating folder app here code below takes string name of folder , checks if sd card available , if creates folder of name in pictures folder else if sd card not present creates folder same name in internal memory app installed data/data.com.myapp/files/yourfolder

public file createdirectoryforapp(context con, string dirname) { file directory=null;     /*      * sections checks phone see if there sd card. if      * there sd card, directory created on sd card       */      if (isexternalstoragewritable()) {           // search directory on sd card         directory = new file(environment.getexternalstoragepublicdirectory(environment.directory_pictures)                 + "/"+dirname+"/");          // if no directory exists, create new directory store test         // results         if (!directory.exists()) {             directory.mkdir();         }      }      else     {           //create new file directory object in internal memory no sd card available         directory = new file(con.getfilesdir()                 + "/"+dirname+"/");          // if no directory exists, create new directory         if (!directory.exists()) {             directory.mkdir();         }       }     return directory;         }  //method used above check external storage  public static boolean isexternalstoragewritable() {     string state = environment.getexternalstoragestate();     if (environment.media_mounted.equals(state)) {         return true;     }     return false; } 

and files specific extension , further files in inner directories(which files) can use following method

private list<file> getlistfiles(file parentdir) { arraylist<file> infiles = new arraylist<file>(); file[] files = parentdir.listfiles(); (file file : files) {     if (file.isdirectory()) {         infiles.addall(getlistfiles(file));     } else {         if(file.getname().endswith(".png")){             infiles.add(file);         }     } } return infiles; } 

and visually represent information depends on how design layout , display data after getting these files.