建築のない生活はありますか？

public abstract class ViewController<T extends ViewModel, D> { public abstract void attach(ViewModelContainer<T> container, @Nullable D data); public abstract void detach(); } 

 public interface ViewModelContainer<T extends ViewModel> extends LifecycleOwner { View getView(); T getViewModel(); } 

 public class ChatFragment extends TrackedFragmentSubscriber implements ViewModelContainer<ChatViewModel>, IMessengerFragment { @Inject ChatMessagesViewController mChatViewController; @Inject TimeInfoViewController mTimeInfoViewController; @Inject ChatToolbarViewController mChatToolbarViewController; @Inject SendMessageViewController mSendMessageViewController; @Inject MessagesPaginationController mMessagesPaginationController; @Inject ViewModelProvider.Factory mViewModelFactory; @Inject UnreadMessagesViewController mUnreadMessagesViewController; @Inject UploadFileProgressViewController mUploadFileProgressViewController; @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { return inflater.inflate(R.layout.face_to_face_chat, container, false); } @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); mChatViewController.attach(this); mSendMessageViewController.attach(this); mChatToolbarViewController.attach(this); mMessagesPaginationController.attach(this); mUnreadMessagesViewController.attach(this); mTimeInfoViewController.attach(this); mUploadFileProgressViewController.attach(this); } @Override public void onDestroyView() { mUploadFileProgressViewController.detach(); mTimeInfoViewController.detach(); mUnreadMessagesViewController.detach(); mMessagesPaginationController.detach(); mChatToolbarViewController.detach(); mSendMessageViewController.detach(); mChatViewController.detach(); super.onDestroyView(); } @Override public ChatViewModel getViewModel() { return ViewModelProviders .of(this, mViewModelFactory) .get(ChatViewModel.class); } } 

したがって、アクティビティはビューの状態を復元します。

 protected void onRestoreInstanceState(Bundle savedInstanceState) { if (mWindow != null) { Bundle windowState = savedInstanceState.getBundle(WINDOW_HIERARCHY_TAG); if (windowState != null) { mWindow.restoreHierarchyState(windowState); } } } 

また、 RecycleViewアダプターがオーバーライドされたonRestoreInstanceState内で更新された場合、復元されたデフォルトのスクロールはリセットされます。

 public class ChatViewModel extends ViewModel { private final MessageRepositoryFacade mMessageRepositoryFacade; private final CurrentChannelProvider mCurrentChannelProvider; private final SendbirdConnectionManager mSendbirdConnectionManager; private final MediatorLiveData<List<MessageModel>> mMessages = new MediatorLiveData<>(); private final MutableLiveData<String> mMessage = new MutableLiveData<>(); @Inject public ChatViewModel(MessageRepositoryFacade messageRepositoryFacade, SendbirdConnectionManager sendbirdConnectionManager, CurrentChannelProvider currentChannelProvider) { mMessageRepositoryFacade = messageRepositoryFacade; mCurrentChannelProvider = currentChannelProvider; mSendbirdConnectionManager = sendbirdConnectionManager; initLiveData(); } public LiveData<List<MessageModel>> getMessages() { return mMessages; } public void writeMessage(String message) { mMessage.postValue(message); } public void sendMessage() { // ... } private void initLiveData() { LiveData<List<MessageModel>> messages = Transformations.switchMap(mCurrentChannelProvider.getCurrentChannel(), input -> { if (!Resource.isDataNotNull(input)) { return AbsentLiveData.create(); } return mMessageRepositoryFacade.getMessagesList(input.data.mUrl); }); mMessages.addSource(messages, mMessages::setValue); mMessages.addSource(mSendbirdConnectionManager.getConnectionStateLiveData(), connectionState -> { if (connectionState == null) { return; } switch (connectionState) { case OPEN: // ... break; case CLOSED: // ... break; } }); } } 

 public class ViewHolder { private final Unbinder mUnbinder; private final View mView; public ViewHolder(View view) { mView = view; mUnbinder = ButterKnife.bind(this, view); } public void unbind() { mUnbinder.unbind(); } public View getView() { return mView; } } 

 @ActivityScope public class SendMessageViewController extends SimpleViewController<ChatViewModel> { @Nullable private ViewHolder mViewHolder; @Nullable private ChatViewModel mChatViewModel; @Inject public SendMessageViewController() {} @Override public void attach(ViewModelContainer<ChatViewModel> container) { mViewHolder = new ViewHolder(container.getView()); mChatViewModel = container.getViewModel(); mViewHolder.mSendMessageButton.setOnClickListener(v -> mChatViewModel.sendMessage()); mViewHolder.mChatTextEdit.addTextChangedListener(new SimpleTextWatcher() { @Override public void afterTextChanged(Editable s) { mChatViewModel.setMessage(s.toString()); } }); } @Override public void detach() { ViewHolderUtil.unbind(mViewHolder); mChatViewModel = null; mViewHolder = null; } public class ChatViewHolder extends ViewHolder { @BindView(R.id.message_edit_text) EmojiconEditText mChatTextEdit; @BindView(R.id.send_message_button) ImageView mSendMessageButton; @BindView(R.id.message_list) RecyclerView mRecyclerView; @BindView(R.id.send_panel) View mSendPanel; public ViewHolder(View view) { super(view); } } } 

 @ActivityScope public class ChatMessagesViewController extends SimpleViewController<ChatViewModel> { private final ChatAdapter mChatAdapter; @Nullable private ChatViewModel mChatViewModel; @Nullable private ViewHolder mViewHolder; @Inject public ChatMessagesViewController(ChatAdapter chatAdapter) { mChatAdapter = chatAdapter; } @Override public void attach(ViewModelContainer<ChatViewModel> container) { mChatViewModel = container.getViewModel(); mViewHolder = new ViewHolder(container.getView()); mViewHolder.mRecyclerView.setAdapter(mChatAdapter); mChatViewModel.getMessages().observe(container, data -> mChatAdapter.updateMessages(data)); } @Override public void detach() { ViewHolderUtil.unbind(mViewHolder); mViewHolder = null; mChatViewModel = null; } public class SendMessageViewHolder extends ViewHolder { @BindView(R.id.message_list) RecyclerView mRecyclerView; public ViewHolder(View view) { super(view); LinearLayoutManager linearLayoutManager = new LinearLayoutManager(view.getContext()); linearLayoutManager.setReverseLayout(true); linearLayoutManager.setStackFromEnd(true); mRecyclerView.setLayoutManager(linearLayoutManager); } } }