RecyclerView 布局发生变化，滚动时值被截断

Question

我已经处理了RecyclerView几次，但这次我做了height/width的items的RecyclerView到wrap_content。这个实现发生的事情是，每当我滚动 时RecyclerView，其中项目的布局和值也会被弄乱。例如，布局太小而无法适应项目的值，因此当我在RecyclerView.

我知道滚动 aRecyclerView将不可避免地回收视图，在创建活动时重用第一个显示的布局。如果我对这个逻辑有错误，请纠正我。

我希望得到一些解决方案或变通方法来解决这个问题，因为我真的很想让RecyclerView项目的布局很好地符合价值。就像 Messenger 应用程序一样，卡片视图的大小适合其内容。我可以在不固定视图大小的情况下实现这一目标吗？

非常感谢！

编辑： 如果这可以让您更好地了解我的问题，我将在此处发布代码。

RecyclerView 适配器

public class ChatAdapter extends RecyclerView.Adapter<ChatAdapter.ViewHolder> {

private static final String TAG = ChatAdapter.class.getSimpleName();

private Context context;
ArrayList<Conversation> conversations;
Conversation conversation;
private static final int TYPE_SENDER = 1;
private static final int TYPE_RECIPIENT = 2;

// Pass in the context and users array into the constructor
public ChatAdapter(Context context, ArrayList<Conversation> conversations) {
    super();
    this.context = context;
    this.conversations = conversations;
}

@Override
public int getItemViewType(int position) {
    conversation = conversations.get(position);
    if (conversation.getIsSender().equals("1")) {
        return TYPE_SENDER;
    } else {
        return TYPE_RECIPIENT;
    }
}

// Create a new ViewHolder to contain our text and image
@Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int position) {
    ViewHolder viewHolder;
    LayoutInflater inflater = LayoutInflater.from(viewGroup.getContext());

    switch (position) {
        case TYPE_SENDER:
            View v1 = inflater.inflate(R.layout.chat_item_sender, viewGroup, false);
            viewHolder = new ViewHolder(v1);
            break;
        case TYPE_RECIPIENT:
            View v2 = inflater.inflate(R.layout.chat_item_recipient, viewGroup, false);
            viewHolder = new ViewHolder(v2);
            break;
        default:
            View v = inflater.inflate(R.layout.chat_item_sender, viewGroup, false);
            viewHolder = new ViewHolder(v);
    }
    return viewHolder;
}

// Display our text and image at the specified position in the list
@Override
public void onBindViewHolder(ViewHolder viewHolder, int position) {
    conversation = conversations.get(position);

    // Feed the message, duration, must put in IF statement or data recycled will be buggy!
    if (!conversation.getMessage().isEmpty()) {
        viewHolder.message.setText(conversation.getMessage());
    } else {
        viewHolder.message.setTypeface(null, Typeface.ITALIC);
        viewHolder.message.setText("Message not retrievable at the moment!");
    }

    if (!conversation.getDate().toString().isEmpty()) {
        viewHolder.duration.setText(DateUtils.getRelativeDateTimeString(context,
                conversation.getDate().getTime(),
                DateUtils.SECOND_IN_MILLIS,
                DateUtils.DAY_IN_MILLIS, 0));
    } else {
        viewHolder.duration.setVisibility(View.GONE);
    }
}

// Get the number of items in the adapter
@Override
public int getItemCount() {
    return conversations.size();
}

public class ViewHolder extends RecyclerView.ViewHolder {

    public TextView message, duration;

    public ViewHolder(View itemView) {
        super(itemView);

        message = (TextView) itemView.findViewById(R.id.chat_message);
        duration = (TextView) itemView.findViewById(R.id.chat_duration);
    }

}
}

chat_item_sender.xml

注意：同chat_item_recipient.xml，都是RecyclerView的item；chat_item_sender.xml 是右侧的橙色视图

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="10dp"
    android:layout_marginTop="10dp"
    android:gravity="center_vertical"
    android:orientation="horizontal">

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="fill_parent"
        android:layout_weight="1">

    </LinearLayout>

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="fill_parent"
        android:layout_marginRight="20dp"
        android:layout_weight="5"
        android:gravity="right|center_vertical">

        <android.support.v7.widget.CardView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            card_view:cardBackgroundColor="@color/primary"
            card_view:cardCornerRadius="10dp"
            card_view:cardPreventCornerOverlap="false"
            card_view:contentPadding="10dp">

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:orientation="vertical">

                <TextView
                    android:id="@+id/chat_message"
                    android:layout_width="fill_parent"
                    android:layout_height="0dp"
                    android:layout_weight="1"
                    android:textColor="@color/white"
                    android:text="@string/shorter_test" />

                <TextView
                    android:id="@+id/chat_duration"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:gravity="bottom|right"
                    android:text="Duration"
                    android:textColor="@color/secondary_white_text"
                    android:textSize="12sp" />

            </LinearLayout>

        </android.support.v7.widget.CardView>

    </LinearLayout>

</LinearLayout>

Answer 1

问题在于将文本视图与父视图嵌套。虽然回收器视图会在绑定期间优化内存使用，但它基本上会从池中提取未更改的视图并重新使用它。由于父视图没有更改，只是文本视图发生了更改，因此它使用池中宽度错误的视图之一。

所以解决方案是不要将文本视图包装在父视图中。