我正在发送API请求以发送电子邮件,并在成功响应后在我的 EmailActivity 类中调用 onBackPressed()。
我还有 AbstractBaseActivity 类,该类由我的 EmailActivity 类扩展。
我经常发生此崩溃。
Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Handler android.app.FragmentHostCallback.getHandler()' on a null object reference
at android.app.FragmentManagerImpl.ensureExecReady + 2003(FragmentManager.java:2003)
at android.app.FragmentManagerImpl.execPendingActions + 2056(FragmentManager.java:2056)
at android.app.FragmentManagerImpl.popBackStackImmediate + 870(FragmentManager.java:870)
at android.app.FragmentManagerImpl.popBackStackImmediate + 831(FragmentManager.java:831)
at android.app.Activity.onBackPressed + 3111(Activity.java:3111)
at android.support.v4.app.FragmentActivity.onBackPressed + 187(FragmentActivity.java:187)
at com.anstar.fieldworkhq.core.AbstractBaseActivity.onBackPressed + 71(AbstractBaseActivity.java:71)
at com.anstar.fieldworkhq.emails.EmailActivity.displayEmailSent + 283(EmailActivity.java:283)
at com.anstar.presentation.emails.EmailPresenter.lambda$sendEmail$2$EmailPresenter + 100(EmailPresenter.java:100)
at com.anstar.presentation.emails.EmailPresenter$$Lambda$2.accept + 4(:4)
at io.reactivex.internal.observers.ConsumerSingleObserver.onSuccess + 62(ConsumerSingleObserver.java:62)
at io.reactivex.internal.operators.single.SingleObserveOn$ObserveOnSingleObserver.run + 81(SingleObserveOn.java:81)
at io.reactivex.android.schedulers.HandlerScheduler$ScheduledRunnable.run + 124(HandlerScheduler.java:124)
at android.os.Handler.handleCallback + 873(Handler.java:873)
at android.os.Handler.dispatchMessage + 99(Handler.java:99)
at android.os.Looper.loop + 193(Looper.java:193)
at android.app.ActivityThread.main + 6718(ActivityThread.java:6718)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run + 493(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main + 858(ZygoteInit.java:858)
这是我的EmailActivity中的代码。
@Override public void displayEmailSent() {
Toast.makeText(this, R.string.email_sent, Toast.LENGTH_SHORT).show();
onBackPressed();
}
这是我在AbstractBaseActivity中的代码。
@Override public void onBackPressed() {
if(this instanceof AddTaskActivity ||
this instanceof AddCustomerActivity ||
this instanceof AddContactsActivity ||
this instanceof NoteDetailsActivity ||
this instanceof AddEstimateActivity ||
this instanceof AddAgreementsActivity ||
this instanceof AddAppointmentActivity ||
this instanceof EditServiceLocationActivity) {
showExitDialogForFormScreens();
} else {
super.onBackPressed();
}
}
这是EmailPresenter的代码。
public void sendEmail(int entityId, EmailType emailType, String emailBody, String subject, List<String> recipients) {
disposables = RxUtil.initDisposables(disposables);
if(TextUtils.isEmpty(subject)) {
view.displaySubjectInvalid();
return;
}
if(TextUtils.isEmpty(emailBody)) {
view.displayEmailBodyInvalid();
return;
}
if(recipients == null || recipients.isEmpty()) {
view.displayRecipientsEmpty();
return;
}
if(!Utils.isValidEmailAddress(recipients.get(0))) {
view.displayEmailToInvalid();
return;
}
String modelType = getModelType(emailType);
view.disableEmailButton();
Disposable disposable = emailsRepository.sendEmail(entityId, modelType, emailBody, subject, recipients)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(response -> {
view.enableEmailButton();
if (response.isSuccessful()) {
view.displayEmailSent();
} else {
view.displayEmailError();
}
}, throwable -> {
view.enableEmailButton();
view.handleError(throwable);});
disposables.add(disposable);
}
我从EmailActivity返回另一个活动,但是如果我返回两个或三个屏幕,它将返回到Fragment
我该如何解决?
答案 0 :(得分:2)
如果您只是想杀死当前活动并返回上一个活动,则可以呼叫finish()
而不是onBackPressed()
。
答案 1 :(得分:2)
根据此日志,我认为您的rxJava仍处于活动状态
io.reactivex.internal.observers.ConsumerSingleObserver.onSuccess + 62(ConsumerSingleObserver.java:62) 在io.reactivex.internal.operators.single.SingleObserveOn $ ObserveOnSingleObserver.run + 81(SingleObserveOn.java:81) 在io.reactivex.android.schedulers.HandlerScheduler $ ScheduledRunnable.run + 124(HandlerScheduler.java:124) 在android.os.Handler.handleCallback + 873(Handler.java:873) 在android.os.Handler.dispatchMessage + 99(Handler.java:99)
尝试调用这样的内容
@Override
protected void onDestroy() {
super.onDestroy();
if(disposable != null && !disposable.isDisposed()) {
disposable.dispose();
}
}
答案 2 :(得分:-1)
我建议使用方法onBackPressed()
来清理finish()
或return()
。