我如何不回收我的recyclerview的前2个视图或任何项目？

Question

我正在使用recyclerview来显示和播放用户的视频.但是,当我滚动循环播放器视图时,我会看到我的第一个视图,其中我的视频被回收,因此其他用户无法看到它.有没有办法可以确保第一个视图不被回收,所以我不必担心每次滚动列表时我的视频视图都会重置回来？

这是我的代码:在我的片段......

 <android.support.v7.widget.RecyclerView
        android:id="@+id/videoList"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:visibility="invisible"
        app:layout_constraintBottom_toTopOf="@+id/myButtonContainer"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/myoldContainer">

...

和相应的适配器......

public class GroupAdapter extends RecyclerView.Adapter<GroupAdapter.myViewHolder> {

    private CopyOnWriteArrayList<Person> persons;
    private Context mContext;

    public GroupAdapter(@NonNull final CopyOnWriteArrayList<Person> persons , Context context) {
        this.persons = persons;
        this.mContext= context;

        for (Person person : this.persons) {
           //get names
        }
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        final View layout = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_person, parent, false);
        final MyViewHolder viewHolder = new MyViewHolder(layout);
        return viewHolder;
    }
     @Override
        public void onBindViewHolder(MyViewHolder holder, int position) {



        final Person person = person.get(position);
                final Participant participant = person.getParticipant();


                if (person.getName() != null) {
                    holder.personName.setText(person.getName());
                }

                if (person.getImage() != null) {
                    holder.personImage.setImageBitmap(person.getImage());
                } else {
                    holder.personImage.setImageResource(R.drawable.default_profile);
                }
                holder.personImage.setVisibility(View.INVISIBLE);
                holder.personImage.setVisibility(View.VISIBLE);

                final VideoView videoView;
                if (participant.isMe) {
                    videoView = participant.videoStreamer.videoView;
                } else {
                    videoView = participant.videoPlayer.videoView;
                }
                if (holder.personVideo.getChildCount() != 0) {
                        holder.personVideo.removeAllViews();

                }
                if (videoView.getParent() != null) {
                    ViewGroup parent = (ViewGroup) videoView.getParent();
                        parent.removeView(videoView);

                }
                holder.personVideo.addView(videoView, myViewHolder.videoLayoutParams);

                if (person.isVideoPaused()) {
                    holder.personVideo.setVisibility(View.INVISIBLE);
                    holder.personImage.setVisibility(View.VISIBLE);
                } else {

                    holder.personVideo.setVisibility(View.VISIBLE);
                    holder.personImage.setVisibility(View.INVISIBLE);
                }


    }
@Override
    public int getItemCount() {
        return persons.size();
    }

    public static final class MyViewHolder extends RecyclerView.ViewHolder {

        @BindView(R.id.personVideo)
        public ViewGroup personVideo;
        @BindView(R.id.personImage)
        public ImageView personImage;
        @BindView(R.id.personName)
        public TextView personName;

        protected static FrameLayout.LayoutParams videoLayoutParams = new FrameLayout.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT
        );

        public MyViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
        }

    }
}

以下是我在片段中设置它的方法:

  LinearLayoutManager manager = new LinearLayoutManager(getActivity(), LinearLayoutManager.HORIZONTAL, false);
            videoAdapter = new VideoAdapter(myHelper.getPeople(), getContext());
            videoList.setLayoutManager(manager);
            videoList.setAdapter(videoAdapter);

item_person:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_marginTop="0dp"
    android:background="@drawable/person_border"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <RelativeLayout
        android:id="@+id/personContainer"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintDimensionRatio="1:1"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent">

        <FrameLayout
            android:id="@+id/personVideo"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@color/black" />

        <ImageView
            android:id="@+id/personImage"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@color/black"
            android:src="@drawable/default_profile" />

        <TextView
            android:id="@+id/personName"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#AA555555"
            android:gravity="center_horizontal|bottom"
            android:textColor="@color/green"
            android:textSize="12sp"
            android:lines="1"
            android:ellipsize="end"
            tools:text="androiduser@gmail.com"
            android:layout_alignParentBottom="true" />

    </RelativeLayout>




</android.support.constraint.ConstraintLayout>

片段与循环视图:xml

<android.support.constraint.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">
<RelativeLayout>
....
</RelativeLayout>
<include containers>...</include>
...
 <android.support.v7.widget.RecyclerView
        android:id="@+id/personList"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:visibility="invisible"
       >

    </android.support.v7.widget.RecyclerView>
 </android.support.constraint.ConstraintLayout>

Answer 1

我不认为“不回收”视频视图实际上会阻止它在滚动时被破坏。问题不在于回收，而在于视图的解除约束。

我认为这样复杂的组件根本VideoView不应该在里面RecyclerView。您可以尝试将其添加为顶部的静态内容，这很可能会解决问题。您可以使用 aNestedScrollView来实现这一点。看看这里：滚动视图中的Recyclerview-如何滚动整个内容？

如果您仍然认为要将其保留在其中RecyclerView并禁用回收，请执行以下操作。

为您的视频视图项目创建单独的视图类型。这是一个示例： https ://stackoverflow.com/a/26573338/3086818 。将您的视频视图项目视为示例中的标题视图。

一旦你这样做了，就会有一个RecycledViewPool类来管理RecyclerView. 您可以告诉它哪些视图要回收，哪些不回收。默认情况下它会回收所有视图。要禁用视频视图项目的回收，请使用新的视图类型，如下所示：

recyclerView.getRecycledViewPool().setMaxRecycledViews(TYPE_VIDEO_VIEW, 0);

其中TYPE_VIDEO_VIEW是您使用前面的示例创建的新类型。数字 0 表示RecyclerView要回收的物品数量 - 在本例中为 0，意思是“不回收”。有关此的更多信息，请访问：/sf/answers/2541940621/。

我希望这有帮助..祝你好运！