android - Does opening an activity from a dialog fragment dismisses the dialog fragment? -

i have class inheriting dialogfragment:

import org.xwalk.core.*; // ...  public class webviewdialogfragment extends dialogfragment {     private xwalkview webview;     public static final string log_tag = "webviewdialogfragment";      private string url;     private webviewjavascriptinterface javascriptinterface;      // constructor use set url.     public webviewdialogfragment(string url, webviewjavascriptinterface javascriptinterface) {         this.url = url;     }      public webviewdialogfragment() {         log.d(log_tag, "webviewdialogfragment empty constructor called.");     }      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         log.d(log_tag, "setting fullscreen mode");         setstyle(dialogfragment.style_normal, r.style.sagobizwebviewfullscreentheme);     }      @override     public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {         log.d(log_tag, "setting xwalkview");         webview = new xwalkview(getactivity(), getactivity());         webview.clearcache(true);         log.d(log_tag, "loading url: " + url);         webview.load(url, null);         return webview;     }      @override      public void onstart() {         super.onstart();          dialog dialog = getdialog();         if (dialog != null) {             int width = viewgroup.layoutparams.match_parent;             int height = viewgroup.layoutparams.match_parent;             dialog.getwindow().setlayout(width, height);         }     }      @override     public void onpause() {         super.onpause();         if (webview != null) {             webview.pausetimers();             webview.onhide();         }     }         @override     public void onresume() {         super.onresume();         if (webview != null) {             webview.resumetimers();             webview.onshow();         }     }      @override     public void ondestroy() {         super.ondestroy();         if (webview != null) {             webview.ondestroy();         }     }      @override     public void onactivityresult(int requestcode, int resultcode, intent data) {         if (webview != null) {             webview.onactivityresult(requestcode, resultcode, data);         }     } } 

and have class has member of type webviewdialogfragment:

public class webview {     protected static final string dialog_fragment_tag = "webviewdialogfragment";      protected activity activity;     protected string dialogfragmenttag = dialog_fragment_tag;        protected webviewdialogfragment webviewdialogfragment;      public webview(activity activity) {         this.activity = activity;     }      public void display(final string url) {         log.d("test", "webview display");          activity.runonuithread(new runnable() {             @override             public void run() {                 webviewdialogfragment = new webviewdialogfragment(url, getwebviewjavascriptinterface());                  if (webviewdialogfragment != null) {                     fragmentmanager fm;                     fm = activity.getfragmentmanager();                     log.d("test", "showing webview");                     webviewdialogfragment.show(fm, webview.this.dialogfragmenttag);                 } else {                     log.e("test", "webviewdialogfragment null");                 }             }         });     }  } 

i call display(string url) method of webview show dialog going show webview.

using @javascriptinterface attribute have created bridge between webview javascript , native java may open external browser (or store) within dialogfragment. javascript interface has method so:

@javascriptinterface public void urlexternalaction(string url) {     intent browserintent = new intent(intent.action_view, uri.parse(url));     webview.activity.startactivity(browserintent); } 

the problem after opening external activity (from dialog fragment), when come app (either pressing button or task switching) app crashes:

androidruntime java.lang.runtimeexception: unable start activity componentinfo{com.myapp.test/com.myapp.testactivity}:

android.app.fragment$instantiationexception: unable instantiate fragment com.myapp.test.webviewdialogfragment: make sure class name exists, public, , has empty constructor public

i solved crash adding empty constructor webviewdialogfragment, not want. want dialogfragment preserves state.

could me modify code resolve issue?

note parent activity's oncreate not in control , prefer not modify it.

thank , forward input. let me know if part needs better explanation.

fragments , activities need 1 empty contructor, and, if provided, must constructor. if want initialize fragment data, must create fragment , use setarguments method before adding fragment fragment manager. @ question.