android - DTO-s with less boiler-code for Intent/Parcable/Bundle/SharedPreferences possible? -

i have app uses dto class myappdata 21 attributes

• transfered via intent via parcable between activities,
• saved/restored via bundle in case of rotation ,
• persisted via sharedpreferences(.editor) if app restarted later

i had write lot of boiler-code implement functionality.

my question: there simpler way less boiler-code achive goal?

why boiler-code?

• implementing interface parcelable neccessary transfer intent between activities.
• sharedpreferences(.editor) survice app-restart: found no way load/save parcable therefore had write code
• fourtunately bundle can load/save parcelable

the boiler-code looks this

    public class myappdata implements parcelable {  /****** here data want use ******************/          private string path = null;         // ... 20 more attibutes          public string getpath() {return path;}         public void setpath(string path) {this.path = path;}         // ... 20 more attibutes  /****** here start lot of boiler-code necessary handle data ******************/          /********** code needed implement interface parcelable *************/         public static final parcelable.creator<myappdata> creator                 = new parcelable.creator<myappdata>() {             public myappdata createfromparcel(parcel in) {                 return new myappdata(in);             }              public myappdata[] newarray(int size) {                 return new myappdata[size];             }         };          public myappdata() {};         private myappdata(parcel in) {             setpath(in.readstring());             // ... 20 more attibutes         }          @override         public void writetoparcel(parcel dest, int flags) {             dest.writestring(getpath());             // ... 20 more attibutes         }          @override         public int describecontents() {return 0;}          /************ code neccessary handle sharedpreferences(.editor) because sharedpreferences cannot handle parcable ********/           private static final string shared_key_path         = "filter_path";             // ... 20 more attibutes          public void savesettings(sharedpreferences.editor edit) {              if (edit != null) {                 edit.putstring(shared_key_path, this.getpath());                 // ... 20 more attibutes             }         }          public void loadsettings(sharedpreferences sharedpref) {             if (sharedpref != null) {                 this.setpath(sharedpref.getstring(shared_key_path, this.getpath()));                 // ... 20 more attibutes             }         }     } 

this code uses myappdata , boiler-code

myappdata mmydata;  // survive recreate on rotation @override public void onsaveinstancestate(bundle savedinstancestate) {     this.mmydata.saveinstancestate(this, savedinstancestate);     super.onsaveinstancestate(savedinstancestate); }  // survive recreate on rotation or remember settings on last app start @override protected void oncreate(bundle savedinstancestate) {     ...     this.mmydata.loadsettingsandinstancestate(this, savedinstancestate);  }  @override protected void onpause () {     ...     this.mmydata.savesettings(this); }  // pass other activity private void opensomeactivity() {     final intent intent = new intent().setclass(context,             someactivity.class);      intent.putextra(extra_filter, filter);      context.startactivityforresult(intent, 0815); }  // receive other activity @override protected void onactivityresult(final int requestcode,                                 final int resultcode, final intent intent) {     super.onactivityresult(requestcode, resultcode, intent);      switch (requestcode) {         case 0815 :             mydata = intent.getparcelableextra(extra_filter);             break;     } } 

i have solved problem implementing string representation of dto: having tostring() , parse() method convert between dto , string.

this way

• transfered via intent between activities,
• saved/restored via bundle in case of rotation and
• persisted via sharedpreferences(.editor) if app restarted later

is handled through string