android - Saving Parcelable data -

i have class implements parcelable, , not implement serializable because contains basic android classes can not modify.

some of objects in class example location , pendingintent (which conveniently parcelable).

my problem saving information between instances of main activity.

currently, i'm holding static reference class, works well. assume when re-install app, , when updates come around, won't able trust static member won't re-initialized.

i tried write parcelable file, using marshall() not working (i'm getting binder can't marshalled error).

how can safely save information?

thanks

i use statecontrol class handle reading/writing disc:

    public class statecontrol {      context mcontext;      thread worker;     writeobjecttofile writer;      // statecontrol constructor      public statecontrol(context context) {         mcontext = context;           // construct writer hold , save data         writer = new writeobjecttofile();          // construct worker thread handle writer         worker = new thread(writer);      }// end of statecontrol constructor         // method save global data     public void saveobjectdata(object object, string key) {          if (object == null){             // had different action here         } else {              // write data disc             writer.setparams(new writeparams(object, key));                      worker.run();          }      }// end of saveglobaldata method       // method read global data     public object readobjectdata(string key){          object returndata = (object) readobjectfromfile(key);          if (returndata == null){                     // had different action here         } else {                 return returndata;         }      }// end of readglobaldata method       // method erase global data     public void clearobjectdata(string key){          writer.setparams(new writeparams(null, key));                worker.run();      }// end of clearglobaldata method         private class writeobjecttofile implements runnable {          writeparams params;          public void setparams(writeparams params) {             this.params = params;         }          public void run() {                      writeobjecttofile(params.getobject(), params.getfilename());                         }          private boolean writeobjecttofile(object object, string filename) {              boolean success = true;                  objectoutputstream objectout = null;                 try {                      fileoutputstream fileout = mcontext.openfileoutput(filename, activity.mode_private);                     objectout = new objectoutputstream(fileout);                     objectout.writeobject(object);                     fileout.getfd().sync();                  } catch (ioexception e) {                     success = false;                     e.printstacktrace();                 } {                     if (objectout != null) {                         try {                             objectout.close();                         } catch (ioexception e) {                             // nothing                         }                      }// end of if                  }// end of try/catch/finally block              return success;         }      }// end of writeobjecttofile method       private object readobjectfromfile(string filename) {          objectinputstream objectin = null;         object object = null;         try {              fileinputstream filein = mcontext.getapplicationcontext().openfileinput(filename);             objectin = new objectinputstream(filein);             object = objectin.readobject();          } catch (filenotfoundexception e) {             // nothing         } catch (ioexception e) {             e.printstacktrace();         } catch (classnotfoundexception e) {             e.printstacktrace();         } {             if (objectin != null) {                 try {                     objectin.close();                 } catch (ioexception e) {                     // nowt                 }             }         }          return object;     }       private static class writeparams {          object object;         string filename;          public writeparams(object object, string filename) {             super();             this.object = object;             this.filename = filename;         }          public object getobject() {             return object;         }          public string getfilename() {             return filename;         }      }  } 

then invoke public methods kick off writing/reading. version, having taking place in separate thread, modify if needed to.