android - Getting the fragment from the current activity -

-

hey guys have fragment 

@override public view oncreateview(layoutinflater inflater, viewgroup container,                          bundle savedinstancestate) {     // inflate layout fragment     return inflater.inflate(r.layout.recordings, container, false); }

here layout

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/recordinglayout">

how fragment object without adding activity? or add something, instance button fragment's layout activity class?

an activity cannot reference fragment has not been instantiated somehow. can instantiate fragment via fragment tag in xml, or create 1 programmatically in java.

i suggest take close @ documentation on creating (and referencing) fragments :)


Comments

Post a Comment

Popular posts from this blog

django - (fields.E300) Field defines a relation with model 'AbstractEmailUser' which is either not installed, or is abstract -

-
i trying create customuser django project email username , add radio button truck , company. in registration process email-id registered per truck or company. mentioned radio button 'tag' , add manytomany field tag in emailuser model. when makemigrations, raising error : (fields.e300) field defines relation model 'abstractemailuser' either not installed, or abstract. i quite new django , not sure whether have created correct code wants. please me solving this. here code, models.py: import django django.contrib.auth.models import ( abstractbaseuser, baseusermanager, permissionsmixin) django.core.mail import send_mail django.db import models django.utils import timezone django.utils.translation import ugettext_lazy _ class emailusermanager(baseusermanager): """custom manager emailuser.""" def _create_user(self, email, password, is_staff, is_superuser, **extra_fields): """create , save emailus...
Read more

matlab - error with cyclic autocorrelation function -

-
Image
i'm trying code cyclic autocorrelation function in matlab follows: t=0:(n-1); t=t*te; i_alpha=0; tau=-n2*te:te:n2*te; alpha=-1/2:1/n:1/2; ryy_cl=zeros(length(alpha),length(tau)); alpha=alpha/te ind_tau=0; i_alpha=i_alpha+1; k=tau ind_tau=ind_tau+1; if k>0 % ryy_cl(i_alpha,ind_tau)=1/length(sig_bin_syl_mod(1:end- k))*sum((sig_bin_syl_mod(1:end-k)).*sig_bin_syl_mod(k+1:end)).*exp(1i*2*pi*alpha*t(1+k:length(sig_bin_syl_mod(1:end)))); ryy_cl(i_alpha,ind_tau)=(1/n)*sum((sig_bin_syl_mod(1:end-k)).*sig_bin_syl_mod(k+1:end)).*exp(-1i*2*pi*alpha*t(1:end-k)); else ryy_cl(i_alpha,ind_tau)=(1/n)*sum((sig_bin_syl_mod(1-k:end)).*sig_bin_syl_mod(1:end+k)).*exp(-1i*2*pi*alpha*t(1-k:end)); end end end i'm getting errors, , doesn't show expecting. according below formulae, how can fix it? the code provided incomplete, difficult confidently reproduce error. in particular, haven't de...
Read more

php - Using grpc in Laravel, "Class 'Grpc\ChannelCredentials' not found." -

-
i trying use grpc in laravel project. this part of composer.json file: "require": { ... "datto/protobuf-php": "dev-master", "google/auth": "^0.7.0", "grpc/grpc": "dev-release-0_13", ... } i have generated php file proto file. placed in app/services/ , included in composer.json autoload.files section. have run composer install without issues. i have created route testing. has following code: $client = new vat_service\vatserviceclient('localhost:50051', [ 'credentials' => grpc\channelcredentials::createinsecure() ]); but receive response class 'grpc\channelcredentials' not found. when visit route. the laravel app running in homestead vagrant box. i don't know how proceed. missing dependency? did miss install something? i have solved problem, not sure of below steps solution. things tried: i installed grpc-beta in homestead box (...
Read more