我正在使用recyclerview来显示和广播用户的视频。但是,当我滚动浏览“回收者” View 时,我看到了我的第一个 View ,该视频中的视频被回收了,因此为什么其他用户看不到它。有没有一种方法可以确保不回收第一个 View ,所以我不必担心每次滚动列表时都会重置视频 View 吗?
这是我的代码:
在我的 fragment 中...
...
<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">
...
以及相应的适配器...
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);
}
}
}
这是我在 fragment 中设置它的方式:
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>
带有回收 View 的 fragment :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>
最佳答案
我不认为“不回收”视频 View 实际上不会阻止您在滚动时破坏它。不是回收是问题,而是 View 解除约束。
我认为像VideoView
这样的复杂组件根本不应该放在RecyclerView
内。您可以尝试将其作为静态内容添加到顶部,这很可能会解决此问题。您可以为此使用NestedScrollView
。在这里看看:Recyclerview inside scrollview- How to scroll whole content?
如果您仍然想将其保留在RecyclerView
中并禁用回收,请执行以下操作。
为您的视频观看项目创建单独的观看类型。这是一个例子:
https://stackoverflow.com/a/26573338/3086818。在示例中,将视频 View 项视为标题 View 。
完成此操作后,将创建一个RecycledViewPool
类,该类管理RecyclerView
中的项目回收。您可以告诉它哪些 View 可以回收,哪些 View 不可以回收。默认情况下,它回收所有 View 。要禁用视频观看项目的回收,请使用新的观看类型,如下所示:
recyclerView.getRecycledViewPool().setMaxRecycledViews(TYPE_VIDEO_VIEW, 0);
其中
TYPE_VIDEO_VIEW
是您使用上一个示例创建的新类型。数字0告诉RecyclerView
要回收多少个项目-在这种情况下为0,表示“不回收”。有关此的更多信息:https://stackoverflow.com/a/36313437/3086818。希望对您有帮助。祝您好运!