如何强制 9 个补丁图像仅针对 RecyclerView 中需要更多 space 的视图进行缩放？

Question

我有一个 RecyclerView，我用消息更新它，我已经将背景设置为 RecyclerView 内的 Textview 和 9-patch-image 。

现在，问题是：当消息的长度很小时，9 个补丁图像运行良好，并且仅缩放到 space 文本占用，但是当一条消息包含具有许多字符的文本时，显然 9 个补丁图像缩放，但当它缩放时，它也会缩放 RecyclerView.

中的所有先前元素

可能是什么原因造成的，如何解决？

这是我的适配器的代码：

CustomAdapter.class

    public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.FeedsViewHolder>
{



    DataHolder d1 = new DataHolder();

    public  class FeedsViewHolder extends RecyclerView.ViewHolder
    {
        private TextView chat;
        private Typeface face;
        private Context mcontext;

        FeedsViewHolder(View itemView)
        {
            super(itemView);
            mcontext = itemView.getContext();
            chat = (TextView)itemView.findViewById(R.id.chatMessage);
            face = Typeface.createFromAsset(itemView.getContext().getAssets(), "Fonts/Roboto-Regular.ttf");
            chat.setTypeface(face);


        }



    }

    private static class DataHolder
    {
        List<Text> feeds;

    }



    CustomAdapter(List<Text> feeds)
    {
        this.d1.feeds = feeds;
    }



    @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        super.onAttachedToRecyclerView(recyclerView);
    }


    @Override
    public FeedsViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.chat_message, viewGroup, false);
        FeedsViewHolder pvh = new FeedsViewHolder(v);
        return pvh;
    }



    @Override
    public void onBindViewHolder(FeedsViewHolder feedViewHolder, int i)
    {
        RelativeLayout.LayoutParams params =
                (RelativeLayout.LayoutParams)feedViewHolder.chat.getLayoutParams();
        feedViewHolder.chat.setPadding(0,0,0,0);
        if(d1.feeds.get(i).isMachineOrHuman())
        {
            params.addRule(RelativeLayout.ALIGN_PARENT_START);
            feedViewHolder.chat.setLayoutParams(params);
            feedViewHolder.chat.setBackground(ContextCompat.getDrawable(feedViewHolder.mcontext, R.drawable.user));
            feedViewHolder.chat.setText(d1.feeds.get(i).getMessage());
        }

        else
        {
            params.addRule(RelativeLayout.ALIGN_PARENT_END);
            feedViewHolder.chat.setLayoutParams(params);
            feedViewHolder.chat.setBackground(ContextCompat.getDrawable(feedViewHolder.mcontext, R.drawable.ais));
            feedViewHolder.chat.setText(d1.feeds.get(i).getMessage());
        }



    }

    @Override
    public int getItemCount()
    {

        if(d1.feeds!=null)
        {
            return d1.feeds.size();
        }
        else
        {
            return 0;
        }
    }



}

这是设置背景的地方：

    feedViewHolder.chat.setBackground(ContextCompat.getDrawable(feedViewHolder.mcontext, R.drawable.user));
feedViewHolder.chat.setBackground(ContextCompat.getDrawable(feedViewHolder.mcontext, R.drawable.ais));

这是 XML 到适配器的 TextView:

chat_message.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/chat_rel"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<TextView android:id="@+id/chatMessage"
android:layout_width="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:layout_marginStart="10dp"
android:layout_marginEnd="10dp"
android:gravity="start"
android:textSize="15sp"
android:textColor="#ffffff"
android:layout_height="wrap_content"
xmlns:android="http://schemas.android.com/apk/res/android" />

EDIT-1

这是前后的样子：

IMAGE-1

IMAGE-2

Answer 1

显然，问题出在我定义重力的地方：

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/chat_rel"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<TextView android:id="@+id/chatMessage"
android:layout_width="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:layout_marginStart="10dp"
android:layout_marginEnd="10dp"
android:gravity="start" <!-- here -->
android:textSize="15sp"
android:textColor="#ffffff"
android:layout_height="wrap_content"
xmlns:android="http://schemas.android.com/apk/res/android" />

解决方法：

从 XML 中删除了 android:gravity="start" 并以编程方式定义它：

            feedViewHolder.chat.setGravity(Gravity.START);
            feedViewHolder.chat.setGravity(Gravity.END);

onBindViewHolder() 变为：

@Override
public void onBindViewHolder(FeedsViewHolder feedViewHolder, int i)
{
    RelativeLayout.LayoutParams params =
            (RelativeLayout.LayoutParams)feedViewHolder.chat.getLayoutParams();

    if(d1.feeds.get(i).isMachineOrHuman())
    {
        params.addRule(RelativeLayout.ALIGN_PARENT_START);
        feedViewHolder.chat.setLayoutParams(params);
        feedViewHolder.chat.setGravity(Gravity.START);
        feedViewHolder.chat.setBackground(ContextCompat.getDrawable(feedViewHolder.mcontext, R.drawable.user));
        feedViewHolder.chat.setText(d1.feeds.get(i).getMessage());
    }

    else
    {
        params.addRule(RelativeLayout.ALIGN_PARENT_END);
        feedViewHolder.chat.setLayoutParams(params);
        feedViewHolder.chat.setGravity(Gravity.END);
        feedViewHolder.chat.setBackground(ContextCompat.getDrawable(feedViewHolder.mcontext, R.drawable.ais));
        feedViewHolder.chat.setText(d1.feeds.get(i).getMessage());
    }



}

如何强制 9 个补丁图像仅针对 RecyclerView 中需要更多 space 的视图进行缩放？

How to force 9 patch images to scale only for Views that require more space in RecyclerView?

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nine-patch

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android-recyclerview