java - Using Parceable to pass Objects in android -

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wrote class helps pass object, working fine until wanted pass more generic object myself. 

public class stepparceble implements parcelable { private step mstep; private jsonobject mstepdata; private onscreen monscreen;  public stepparceble(step step, jsonobject stepdata, onscreen onscreen) {     setmstep(step);     setmstepdata(stepdata);     setmonscreen(onscreen); }  public stepparceble(parcel parcel){  } public onscreen getmonscreen() {     return monscreen; }  public void setmonscreen(onscreen monscreen) {     this.monscreen = monscreen; }  public void setmstep(step mstep) {     this.mstep = mstep; }  public void setmstepdata(jsonobject mstepdata) {     this.mstepdata = mstepdata; }  public jsonobject getmstepdata() {     return mstepdata; }  public step getmstep() {     return mstep; }  @override public int describecontents() {     return 0; }  @override public void writetoparcel(parcel dest, int flags) {     try {         dest.writearray(new object[]{mstep, mstepdata,monscreen});     } catch (exception e) {     } }  public static final parcelable.creator creator = new parcelable.creator() {     public stepparceble createfromparcel(parcel in) {         return new stepparceble(in);     }      public stepparceble[] newarray(int size) {         return new stepparceble[size];     } };

}

it return null pointer on getting of values.

passing data 

stepparceble stepparceble = new stepparceble(step, stepdata, onscreen);             intent uiintent = new intent(context, uiactivity.class).putextra(uicontroltrier.step_key,stepparceble);

you didn't provide means read fields parcelable when you've overridden constructor

public stepparceble(parcel parcel){ //add methods populate fields parcel }

you can use android studio plugins you: https://github.com/mcharmas/android-parcelable-intellij-plugin

also, if class has complex-type fields (like step in case), should parcelable too


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