Given:

RecyclerView from CardView elements. The ManagerListAdapter is responsible for the RecyclerView , the constructor of which is passed to ArrayList when creating the instance. ArrayList elements populate the CardView in the ManagerListAdapter.

This all works correctly.

Task:

When creating an instance of the ManagerListAdapter , pass an ArrayList obtained with JSON using Retrofit 2 to its instance.

Problem:

As Google says, you cannot create such GET requests in the UI stream, you need to use an asynchronous stream through .enuque

In this case, the ManagerListAdapter can only be created in the UI stream.

Question:

How correctly to transfer received from JSON ArrayList in the designer of the adapter ManagerListAdapter ?

Perhaps, I use not absolutely that approach?

Initializing RecyclerView in one of the Fragment :

 private void initRecyclerView() { RecyclerView managersRecyclerView = (RecyclerView) view.findViewById(R.id.managersRecyclerView); managersRecyclerView.setLayoutManager(new LinearLayoutManager(getContext())); managersRecyclerView.setAdapter(new ManagerListAdapter(getManagers())); // getRemoteManagers(); } private void getRemoteManagers() { ApiObject client = ServiceGenerator.createService(ApiObject.class); Call<List<ManagerDTO>> call = client.getManagers(); call.enqueue(new Callback<List<ManagerDTO>>() { @Override public void onResponse(Call<List<ManagerDTO>> call, Response<List<ManagerDTO>> response) { if (response.isSuccessful()) { List<ManagerDTO> managers = response.body(); //Эту коллекцию я хочу добавить в конструктор ManagerListAdapter sortManagers(managers); } } @Override public void onFailure(Call<List<ManagerDTO>> call, Throwable t) { } }); } private List<ManagerDTO> getManagers() { //Заглушка для тестирования, локальный вариант. List<ManagerDTO> managers = new ArrayList<>(); managers.add(new ManagerDTO("Alex Pavlov", 100)); managers.add(new ManagerDTO("Ivan Pavlov", 95)); managers.add(new ManagerDTO("Petr Pavlov", 99)); managers.add(new ManagerDTO("Stepan Pavlov", 100)); managers.add(new ManagerDTO("Azik Pavlov", 100)); managers.add(new ManagerDTO("Azik Myand", 100)); managers.add(new ManagerDTO("Azik Specca", 50)); managers.add(new ManagerDTO("Azik Kane", 0)); managers.add(new ManagerDTO("Azik McDonald", 99)); managers.add(new ManagerDTO("Azik Jagr", 1)); sortManagers(managers); return managers; }

This question was also asked on the English stack:

How to get response from other thread using Retrofit 2.0

UPDATE 18.07

ServiceGenerator

 public class ServiceGenerator { private static final String URL = "https://api.myjson.com/bins/"; private static Retrofit.Builder builder = new Retrofit.Builder() .addCallAdapterFactory(RxJavaCallAdapterFactory.createWithScheduler(Schedulers.io())) .baseUrl(URL) .addConverterFactory(JacksonConverterFactory.create()); public static <S> S createService(Class<S> serviceClass) { Retrofit retrofit = builder.build(); return retrofit.create(serviceClass); }

Apiobject

 import java.util.List; import retrofit2.http.GET; import rx.Observable; public interface ApiObject { @GET("11p73.json") Observable<List<ManagerDTO>> getManagers(); }

getRemoteManagers

 private void getRemoteManagers() { ApiObject client = ServiceGenerator.createService(ApiObject.class); Observable<List<ManagerDTO>> managers = client.getManagers(); managers .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(new Subscriber<List<ManagerDTO>>() { @Override public void onCompleted() { //do nothing } @Override public void onError(Throwable e) { Log.e("OnError", "Not good"); } @Override public void onNext(List<ManagerDTO> managers) { RecyclerView managersRecyclerView = (RecyclerView) view.findViewById(R.id.managersRecyclerView); managersRecyclerView.setLayoutManager(new LinearLayoutManager(getContext())); managersRecyclerView.setLayoutManager(new LinearLayoutManager(getContext())); managersRecyclerView.setAdapter(new ManagerListAdapter(managers)); } }); }

Log:

  07-18 06:29:43.706 4442-4442/ru.alexbykov.sailesstat E/AndroidRuntime: FATAL EXCEPTION: main Process: ru.alexbykov.sailesstat, PID: 4442 java.lang.NoClassDefFoundError: Failed resolution of: Lretrofit2/adapter/rxjava/RxJavaCallAdapterFactory; at ru.alexbykov.sailesstat.remote.dto.ServiceGenerator.<clinit>(ServiceGenerator.java:17) at ru.alexbykov.sailesstat.statistic.fragments.tabSales.ManagersFragment.getRemoteManagers(ManagersFragment.java:73) at ru.alexbykov.sailesstat.statistic.fragments.tabSales.ManagersFragment.initRecyclerView(ManagersFragment.java:67) at ru.alexbykov.sailesstat.statistic.fragments.tabSales.ManagersFragment.onCreateView(ManagersFragment.java:59) at android.support.v4.app.Fragment.performCreateView(Fragment.java:1974) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1067) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1252) at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:742) at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1617) at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:570) at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141) at android.support.v4.view.ViewPager.populate(ViewPager.java:1177) at android.support.v4.view.ViewPager.populate(ViewPager.java:1025) at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1545) at android.view.View.measure(View.java:17547) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:668) at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:735) at android.view.View.measure(View.java:17547) at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:1075) at android.view.View.measure(View.java:17547) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) at android.widget.FrameLayout.onMeasure(FrameLayout.java:436) at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) at android.view.View.measure(View.java:17547) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) at android.view.View.measure(View.java:17547) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) at android.widget.FrameLayout.onMeasure(FrameLayout.java:436) at android.view.View.measure(View.java:17547) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) at android.view.View.measure(View.java:17547) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) at android.widget.FrameLayout.onMeasure(FrameLayout.java:436) at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2615) at android.view.View.measure(View.java:17547) at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2015) at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1173) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1379) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1061) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5885) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767) at android.view.Choreographer.doCallbacks(Choreographer.java:580) at android.view.Choreographer.doFrame(Choreographer.java:550) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android 07-18 06:29:43.706 4442-4442/ru.alexbykov.sailesstat D/Error: ERR: exClass=java.lang.ClassNotFoundException 07-18 06:29:43.706 4442-4442/ru.alexbykov.sailesstat D/Error: ERR: exMsg=Didn't find class "retrofit2.adapter.rxjava.RxJavaCallAdapterFactory" on path: DexPathList[[dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-support-annotations-23.3.0_5de1f4990c3728db7199bf5c90bfdb9def350a94-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-slice_9-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-slice_8-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-slice_7-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-slice_6-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-slice_5-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-slice_4-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-slice_3-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-slice_2-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-slice_1-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-slice_0-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-retrofit-2.1.0_8b8f8e10a24e9cbb87d2817f40dae9b260cf7282-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-okio-1.8.0_b8b5a990379e0c2ac791ab0c60e6d287203675f2-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-okhttp-3.3.0_866858d020e75cefeef6ab6b91a11fd0f01f1cad-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-jackson-databind-2.7.2_16e021f670fa80a4e5bff4cbb34bd38f737d85f8-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-jackson-core-2.7.2_dda0286f28d26c1864b8b07e760d8e17be822281-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-jackson-annotations-2.7.0_7ca878bfbcac373c0abd0f8db967beedc4f2d50f-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-internal_impl-23.3.0_7d4478fe63824ec180d999bac79eed2e00dfbdcd-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-converter-jackson-2.1.0_fb2f5790154a81f89b59fa9475c841489aa12048-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-com.jakewharton-butterknife-8.1.0_8235e6ed1a224a7cff79b1e0e63f739474e0008a-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-com.android.support-support-vector-drawable-23.3.0_a8eb97e4d985983e20b47dc6def5331594cf0d7c-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-com.android.support-support-v4-23.3.0_04c4d80e6e44a7b94ad5796f30419a8aafdc4608-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-com.android.support-recyclerview-v7-23.3.0_0274d8817f144b6caeef34836695e068a055782a-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-com.android.support-design-23.3.0_6836fcb43ed2de008a5ece0a6c80bfe80babf58c-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-com.android.support-cardview-v7-23.3.0_bb32e1ecd443ace6a7a6ef2db7a64f3647077cc0-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-com.android.support-appcompat-v7-23.3.0_49ad66e001493b50a4c053b5bd9f87269fbc7ec1-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-com.android.support-animated-vector-drawable-23.3.0_88f27537c1bceae88b9a0d4e5f96b37399657141-classes.dex", dex file "/data/data/ru.alexbykov.sailesstat/files/instant-run/dex/slice-butterknife-annotations-8.1.0_ba06f0ea21d2a585450c9fb25457676f0e115968-classes.dex"],nativeLibraryDirectories=[/vendor/lib, /system/lib, /vendor/lib, /system/lib]] 07-18 06:29:43.706 4442-4442/ru.alexbykov.sailesstat D/Error: ERR: file=BaseDexClassLoader.java 07-18 06:29:43.706 4442-4442/ru.alexbykov.sailesstat D/Error: ERR: class=dalvik.system.BaseDexClassLoader 07-18 06:29:43.706 4442-4442/ru.alexbykov.sailesstat D/Error: ERR: method=findClass line=56 07-18 06:29:43.706 4442-4442/ru.alexbykov.sailesstat D/Error: ERR: stack=java.lang.NoClassDefFoundError: Failed resolution of: Lretrofit2/adapter/rxjava/RxJavaCallAdapterFactory; at ru.alexbykov.sailesstat.remote.dto.ServiceGenerator.<clinit>(ServiceGenerator.java:17) at ru.alexbykov.sailesstat.statistic.fragments.tabSales.ManagersFragment.getRemoteManagers(ManagersFragment.java:73) at ru.alexbykov.sailesstat.statistic.fragments.tabSales.ManagersFragment.initRecyclerView(ManagersFragment.java:67) at ru.alexbykov.sailesstat.statistic.fragments.tabSales.ManagersFragment.onCreateView(ManagersFragment.java:59) at android.support.v4.app.Fragment.performCreateView(Fragment.java:1974) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1067) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1252) at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:742) at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1617) at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:570) at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141) at android.support.v4.view.ViewPager.populate(ViewPager.java:1177) at android.support.v4.view.ViewPager.populate(ViewPager.java:1025) at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1545) at android.view.View.measure(View.java:17547) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:668) at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:735) at android.view.View.measure(View.java:17547) at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:1075) at android.view.View.measure(View.java:17547) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) at android.widget.FrameLayout.onMeasure(FrameLayout.java:436) at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) at android.view.View.measure(View.java:17547) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) at android.view.View.measure(View.java:17547) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) at android.widget.FrameLayout.onMeasure(FrameLayout.java:436) at android.view.View.measure(View.java:17547) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) at android.view.View.measure(View.java:17547) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) at android.widget.FrameLayout.onMeasure(FrameLayout.java:436) at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2615) at android.view.View.measure(View.java:17547) at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2015) at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1173) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1379) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1061) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5885) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767) at android.view.Choreographer.doCallbacks(Choreographer.java:580) at android.view.Choreographer.doFrame(Choreographer.java:550) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread. 07-18 06:29:43.706 4442-4442/ru.alexbykov.sailesstat D/Error: ERR: TOTAL BYTES WRITTEN: 36252 07-18 06:29:47.845 4442-4442/ru.alexbykov.sailesstat I/Process: Sending signal. PID: 4442 SIG: 9

    1 answer 1

    To do something in the UI thread in the activation, it has a method runOnUiThread(Runnable run)

    Those. wrap the necessary code like this:

     runOnUiThread(new Runnable() { @Override public void run() { //код тут выполнится в основном потоке. } });

    You can also adapt RxJava here. Here is the issue with SO , here is the GitHub repository and the article on Habr

    • Thanks for the next answer and articles, I study. (so far it is difficult to quickly understand this volume). Regarding runOnUiThread , under the conditions I made a mistake (I already fixed it). Instead of an Activity , I have Fragment 's spinning around. As I understand it, you can also solve this problem by using Singleton with the required sheet and loadingIndicator . - no news
    • @nonews, if in a fragment, you can do this: getActivity().runOnUiThread(...); - JuriySPb ♦
    • I tried to wrap the necessary part of the code (in my example, this is initRecyclerView(); I got this error. - no news
    • @nonews, is it just a warning in the logs and everything is working or falling? I personally did not understand what you mean. - Yuriy SPb ♦
    • The application starts, but it does not load the data, because The adapter was created in the wrong stream (according to the link indicated in the past comments). Tomorrow, on your advice, I will try RxJava. Unsubscribe about the results - no news