Send .dex file via post request android studio -

for own purposes, want send other app's dex file remote server , answer.

i've used answers found here. tried create simple example @ first, connect server , upload dex file. far haven't managed extract dex other apps , thought of using dex file have. i've read, not common files should stored either "/res/raw" or "assets" tried many ways load file none of them worked . path used in cases found in right click on file -> copy reference.

1. create res folder under /raw ,

   file f = new file("res/raw/filename.dex"); 

2. create new assets folder under /app

   file f = new file("filename.dex"); 

3. create assets folder under /main

   file f = new file("main/assets/filename.dex"); 

   and on.

the way managed using inputstream

inputstream in = getresources().openrawresources(r.raw.filename_without_dex) 

but couldn't cast file, dropped solution.i want have file cause following post request must multipart/form.

in java, way "load" file straightforward. why not in android ?

a ugly, quick , dirty solution.
no error check or cleanup.
works.

import android.content.pm.applicationinfo; import android.content.pm.packagemanager; import android.os.bundle; import java.io.bytearrayinputstream; import java.io.bytearrayoutputstream; import java.io.ioexception; import java.io.inputstream; import java.io.randomaccessfile; import android.support.v7.app.actionbaractivity; import android.util.log; import android.view.menu; import android.view.menuitem; import java.util.arraylist; import java.util.list; import java.util.zip.zipentry; import java.util.zip.zipfile; import java.util.zip.zipinputstream;  public class mainactivity extends actionbaractivity {     final string tag = "getdex";      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          getapppaths(); // list packages          string s = "/data/app/softkeyboard/softkeyboard.apk"; // sample package         byte[] b = getfile(s);         byte[] dex = unzipdex(b, s);         log.d(tag, string.format("dex size %d", dex.length));     }      list<string> getapppaths() {     final packagemanager pm = getpackagemanager();     //get list of installed apps.     list<applicationinfo> packages =  pm.getinstalledapplications(packagemanager.get_meta_data);     list<string> paths = new arraylist<>();      (applicationinfo packageinfo : packages) {         log.d(tag, "installed package :" + packageinfo.packagename);         log.d(tag, "apk file path:" + packageinfo.sourcedir);         paths.add(packageinfo.sourcedir);     }      return paths; }   byte[] getfile(string filename) {     try {         randomaccessfile f = new randomaccessfile(filename, "r");         byte[] b = new byte[(int)f.length()];         f.readfully(b);         return b;     } catch(ioexception exception) {         exception.printstacktrace();     }      return null; }  public byte[] unzipdex(byte[] bytes, string filename) {     try{         zipfile zipfile = new zipfile(filename);         zipinputstream zis = new zipinputstream(new bytearrayinputstream(bytes));         zipentry ze = zis.getnextentry();          while(ze!=null){             string entryname = ze.getname();             if(!entryname.equals("classes.dex")) {                 ze = zis.getnextentry();                 continue;             }              inputstream = zipfile.getinputstream(ze);              bytearrayoutputstream buffer = new bytearrayoutputstream();              int nread;             byte[] data = new byte[16384];              while ((nread = is.read(data, 0, data.length)) != -1) {                 buffer.write(data, 0, nread);             }              buffer.flush();              return buffer.tobytearray();         }         system.out.println("done");      }catch(ioexception ex){         ex.printstacktrace();     }      return null; } 

}