android - Update Initial Props on Reload in React Native -


i have react native application (android) returns initial props activity delegate:

public class mainreactactivitydelegate extends reactactivitydelegate {     private integer count = 1;     ...     @android.support.annotation.nullable     @override     protected bundle getlaunchoptions() {         bundle initialprops = new bundle();         initialprops.putstring("count", this.count);          return initialprops;     }     ... }

i increment count in 1 of components works fine when shake reload getlaunchoptions not called , initial value of 1 used.

is there hook in can update initial props when reloading app?

you can use reactinstancemanager.addreactinstanceeventlistener hook reload event , reactrootview.setappproperties update initial props.

mainactivity.java

public class mainactivitytest extends reactactivity {      private reactinstancemanager minstancemanager;     private reactactivitydelegate mdelegate;     private reactrootview mreactrootview;      /**      * returns name of main component registered javascript.      * used schedule rendering of component.      */     @override     protected string getmaincomponentname() {         return "projectname";     }       @override     protected reactactivitydelegate createreactactivitydelegate() {          //create custom reactactivitydelegate         mdelegate = new reactactivitydelegate(this, getmaincomponentname()) {             @override             protected reactrootview createrootview() {                 mreactrootview = new reactrootview(mainactivitytest.this);                 return mreactrootview;             }         };          return mdelegate;     }      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         if (minstancemanager == null) {             minstancemanager = mdelegate.getreactinstancemanager();             //hook reload event             minstancemanager.addreactinstanceeventlistener(new reactinstancemanager.reactinstanceeventlistener() {                 @override                 public void onreactcontextinitialized(reactcontext context) {                     //random num test case                     int num = (int) (math.random() * 100);                     bundle initialprops = new bundle();                     initialprops.putstring("count", num + "");                     //update init props when app reload                     mreactrootview.setappproperties(initialprops);                     log.e(reactconstants.tag, "onreactcontextinitialized: " + num);                 }             });         }      }  }

but restore count after app reloaded, may not ideally solution.you better create native modules sync count data between javascript , java.


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