android - support.v7.app.AlertDialog throws NullPointerException on dismiss -


i updated appcompat newly released revision 22.1.0 , changed alertdialog support.v7.app.alertdialog. on lollipop device, throws following exception on dismissdialog().

java.lang.nullpointerexception:   attempt invoke virtual method 'java.lang.class java.lang.object.getclass()' on null object reference   @ android.support.v7.internal.app.windowdecoractionbar.getdecortoolbar(windowdecoractionbar.java:248)   @ android.support.v7.internal.app.windowdecoractionbar.init(windowdecoractionbar.java:201)   @ android.support.v7.internal.app.windowdecoractionbar.<init>(windowdecoractionbar.java:184)   @ android.support.v7.app.appcompatdeleg  ateimplv7.cre  atesupportactionbar(appcompatdelegateimplv7.java:176)   @ android.support.v7.app.appcompatdelegateimplbase.getsupportactionbar(appcompatdelegateimplbase.java:85)   @ android.support.v7.app.appcompatdelegateimplv7.onstop(appcompatdeleg  ateimplv7.java:221)   @ android.support.v7.app.appcompatdialog.onstop(appcompatdialog.java:108)   @ android.app.dialog.dismissdialog(dialog.java:438)   @ android.app.dialog.dismiss(dialog.java:414)   @ android.support.v7.app.alertcontroller$buttonhandler.handlemessage(alertcontroller.java:157)   @ android.os.handler.dispatchmessage(handler.java:102)   @ android.os.looper.loop(looper.java:145)   @ android.app.activitythread.main(activitythread.java:5834)   @ java.lang.reflect.method.invoke(native method)   @ java.lang.reflect.method.invoke(method.java:372)   @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:1388)   @ com.android.internal.os.zygoteinit.main(zygoteinit.java:1183)

how fix it?

(lower-version devices seems work well. happens in lollipop)

+ don't call dismiss() explicitly in code. dialog throws exception when dismissed back-button or positive/negative button.

++ here code uses v7.app.alertdialog. thank you.

import android.app.dialog; import android.content.dialoginterface; import android.content.dialoginterface.onclicklistener; import android.os.bundle; import android.support.v4.app.dialogfragment; import android.support.v7.app.alertdialog; import android.text.textutils;  public class simpleyesnofragment extends dialogfragment {      public interface onconfirmlistner {         public void onconfirm();     }      public static simpleyesnofragment newinstance(string title, string message) {         simpleyesnofragment fragment = new simpleyesnofragment();         bundle args = new bundle();         args.putstring("title", title);         args.putstring("message", message);         fragment.setarguments(args);          return fragment;     }      private onconfirmlistner mlistener;      public void setonconfirmlistener(onconfirmlistner l) {         mlistener = l;     }      @override     public dialog oncreatedialog(bundle savedinstancestate) {         alertdialog.builder b=  new  alertdialog.builder(getactivity())         .setpositivebutton(r.string.yes, new onclicklistener() {              @override             public void onclick(dialoginterface dialog, int which) {                 if(mlistener != null) {                     mlistener.onconfirm();                 }             }         })         .setnegativebutton(r.string.no, new onclicklistener() {             @override             public void onclick(dialoginterface dialog, int which) {             }         });          bundle args = getarguments();         string title = args.getstring("title",null);         if(!textutils.isempty(title)) {             b.settitle(title);         }         string message = args.getstring("message",null);         if(!textutils.isempty(message)) {             b.setmessage(message);         }          return b.create();     } }

by chance i've noticed project has values-v21/themes.xml , applies android:theme.material.light.dialog.alert support.v7.app.alertdialog. caused weird bug.

using proper appcompat theme, such theme.appcompat.light.dialog.alert, support.v7.app.alertdialog solved problem. helping me out.


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