使用新的Navigation体系结构组件,从片段无法进行SharedElement过渡时,包含一个recyclerview到另一个片段

时间:2019-03-29 09:00:10

标签: android android-fragments android-recyclerview android-jetpack android-architecture-navigation

我有一个包含2个片段的android应用,第一个片段包含一个recyclerview,其中显示了联系人列表,这是第一个片段的代码

public class NotesFragment extends Fragment implements ContactsAdapter.OnContactClicked {


    public NotesFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_notes, container, false);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        RecyclerView rvContacts = view.findViewById(R.id.rvContacts);
        rvContacts.setLayoutManager(new LinearLayoutManager(getContext(), RecyclerView.VERTICAL, false));

        List<Contact> contacts = new ArrayList<Contact>(){{
            add(new Contact(1,"Antoine El Murr"));
            add(new Contact(2,"Joelle Abou Chakra"));
            add(new Contact(3,"Michel Jebran"));
            add(new Contact(4,"Charlie Abou Moussa"));
            add(new Contact(5,"Edward Salameh"));
            add(new Contact(6,"Makram Merdass"));
            add(new Contact(7,"Sami Abou Jaoudeh"));
            add(new Contact(8,"Elie Nassif"));
            add(new Contact(9,"Samer Abou Samra"));
            add(new Contact(10,"Fady Ammoury"));
            add(new Contact(11,"Dany Fahed"));
            add(new Contact(12,"Mariana Haddad"));
            add(new Contact(13,"Mohamad Restom"));
        }};

        ContactsAdapter adapter = new ContactsAdapter(contacts);
        adapter.setOnContactClicked(this);
        rvContacts.setAdapter(adapter);

    }

    @Override
    public void onContactClicked(int position, Contact contact, View holderView) {
        NavController navController = Navigation.findNavController(holderView);
        Bundle arguments = new Bundle();
        arguments.putParcelable("contact", contact);
        FragmentNavigator.Extras extras = new FragmentNavigator.Extras.Builder()
                .addSharedElement(holderView.findViewById(R.id.tvIcon), ViewCompat.getTransitionName(holderView.findViewById(R.id.tvIcon)))
                .addSharedElement(holderView.findViewById(R.id.tvName), ViewCompat.getTransitionName(holderView.findViewById(R.id.tvName)))
                .build();
        navController.navigate(R.id.ContactToDetails, arguments, null, extras);
    }
}

我正在使用android jetpack导航组件 在recyclerview元素的布局文件中,我设置每个元素的过渡名称,如下所示:

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/tvIcon"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginBottom="8dp"
        android:background="@drawable/circular_shape"
        android:gravity="center"
        android:textColor="@android:color/white"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:transitionName="icon"
        tools:text="A" />

    <TextView
        android:id="@+id/tvName"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="24dp"
        android:layout_marginEnd="8dp"
        android:gravity="start"
        android:textSize="18sp"
        app:layout_constraintBottom_toBottomOf="@+id/tvIcon"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/tvIcon"
        app:layout_constraintTop_toTopOf="@+id/tvIcon"
        android:transitionName="name"
        tools:text="Antoine El Murr" />

</androidx.constraintlayout.widget.ConstraintLayout>

并在我的适配器中创建了一个界面,该界面可在单击联系人时触发功能

在第二个片段中,我在xml布局中设置了转换名称,如下所示:

<androidx.constraintlayout.widget.ConstraintLayout 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"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context=".ContactDetailsFragment">

    <TextView
        android:id="@+id/tvIcon"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:background="@drawable/circular_shape"
        android:gravity="center"
        android:textColor="@android:color/white"
        android:textSize="24sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="A"
        android:transitionName="icon"/>

    <TextView
        android:id="@+id/tvName"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="24dp"
        android:layout_marginEnd="8dp"
        android:gravity="start"
        android:textSize="18sp"
        app:layout_constraintBottom_toBottomOf="@+id/tvIcon"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/tvIcon"
        app:layout_constraintTop_toTopOf="@+id/tvIcon"
        tools:text="Antoine El Murr"
        android:transitionName="name"/>

</androidx.constraintlayout.widget.ConstraintLayout>

并在onCreate中输入enter过渡,但它不起作用:

@Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setSharedElementEnterTransition(TransitionInflater.from(getContext()).inflateTransition(android.R.transition.move));
    }

请帮忙,我上网冲浪寻求解决方案,但是所有示例都在旧的导航系统上运气不佳,而新示例则是如何从一个片段到另一个片段,而不是从recyclerview中使用SharedElements,并且android网站上的文档又少又少,并且没有涵盖使用新的导航组件实现此过渡的所有步骤

2 个答案:

答案 0 :(得分:0)

确保布局之间具有匹配的transitionName(s)

android:transitionName="YOUR_TRANSITION_NAME"

然后确保像这样传递共享视图实例(您也可以使用safeArgs):

some_view.setOnClickListener{
  val extras = FragmentNavigatorExtras(
    yourSharedViewInstance to "YOUR_TRANSITION_NAME"
  )
  findNavController().navigate(R.id.your_destination_action, null, null, extras)
}

然后在您的目的地

override fun onCreate(savedInstanceState: Bundle?) {
  super.onCreate(savedInstanceState)
  sharedElementEnterTransition = TransitionInflater.from(context).inflateTransition(android.R.transition.move /* or any other transition you want to use */)
}

那应该是:)

答案 1 :(得分:0)

我已经解决了这个问题,而不是将过渡名称放在xml元素中,而是将其放在ViewHolder(或Adapter)中,并为回收视图中的每个元素赋予唯一的过渡名称

示例:
位置0->过渡名称=“ image_view_transition_0”的元素
位置1->过渡名称=“ image_view_transition_1”

因此android知道要设置动画的元素,如果所有元素都具有相同的过渡名称,它将对要设置动画的元素感到困惑