相关疑难解决方法(0)

来自https://developer.android.com/preview/material/ui-widgets.html

当我们创建时,RecyclerView.Adapter我们必须指定ViewHolder将与适配器绑定.

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

    private String[] mDataset;

    public MyAdapter(String[] myDataset) {
        mDataset = myDataset;
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public TextView mTextView;
        public ViewHolder(TextView v) {
            super(v);
            mTextView = v;
        }
    }

    @Override
    public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.some_layout, parent, false);

        //findViewById...

        ViewHolder vh = new ViewHolder(v);
        return vh;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.mTextView.setText(mDataset[position]);
    }

    @Override
    public int …

可以在新的RecyclerView中使用可扩展列表项吗？像ExpandableListView一样？

扩展CardView的正确方法是什么？

我在应用程序创建的底部有3个按钮,我只是尝试使用一些股票Android图标而不是文本或两者的组合.有andoid:drawableStart / top / bottom / etc命令,但我只是希望这些图标显示在中间.似乎没有简单的解决方案吗？这是我正在使用的:

<RelativeLayout
    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"
    android:background="@drawable/calm"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".PiktuurMain" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true" >

        <Button
            android:id="@+id/takepic"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@drawable/round" />

        <Button
            android:id="@+id/editpic"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="15dp"
            android:layout_marginRight="15dp"
            android:layout_weight="1"
            android:background="@drawable/round" />

        <Button
            android:id="@+id/sharepic"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@drawable/round"
            android:drawableStart="@android:drawable/ic_dialog_email" />
    </LinearLayout>
</RelativeLayout>

我正在尝试在recyclerview中扩展cardviews.我让扩展部分工作,但是当添加转换时,一些视觉错误开始发生.当没有屏幕外项目时,转换工作正常,但当我向Recyclerview添加超过(在我的情况下)4个项目时,它开始发生.

GIF有4件商品

GIF超过4项

当禁用过渡动画时,cardview扩展可以正常使用4个以上的项目.我认为问题与职位变化有关,但我无法找到解决问题的办法.

我用来实现cardview扩展的指南可以在这里找到:https://stackoverflow.com/a/38623873/6673949

还有我完整的recyclerview适配器

public class BasketRecyclerAdapter extends RecyclerView.Adapter<BasketRecyclerAdapter.CustomViewHolder> {
private String letter;
private Context mContext;
private ColorGenerator generator = ColorGenerator.MATERIAL;
private List<Basket> baskets;
private int mExpandedPosition = -1;
private RecyclerView r1;

public BasketRecyclerAdapter(Context context, List<Basket> baskets, RecyclerView r1) {
    this.mContext = context;
    this.baskets = baskets;
    this.r1 = r1;

}

@Override
public CustomViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
    View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.basket_menu_item, null);
    CustomViewHolder viewHolder = new CustomViewHolder(view);
    return viewHolder;
}

@Override
public void onBindViewHolder(final BasketRecyclerAdapter.CustomViewHolder …

如果我展开recyclerview中的任何项目它扩展正常,但当我向下滚动recylerview我发现其他项目也扩大,由于回收它采取扩大的尺寸而不是原来的

 public class FeedAdapter extends RecyclerView.Adapter<FeedAdapter.MyViewHolder> implements View.OnClickListener {

    private LayoutInflater inflater;
    private Context mcontext;
    private int mOriginalHeight = 0;
    private boolean mIsViewExpanded = false;

    public FeedAdapter(Context context) {
        inflater = LayoutInflater.from(context);
        mcontext = context;

    }


    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {

        View view = inflater.inflate(R.layout.custom_row, viewGroup, false);
        MyViewHolder holder = new MyViewHolder(view);
        holder.frame.setOnClickListener(this);


        return holder;
    }

    @Override
    public void onBindViewHolder(MyViewHolder myViewHolder, int i) {


    }

    @Override
    public int getItemCount() {
        return 100;
    }

    @Override
    public void onClick(final …