Java 从recycleview获取cardview中textview的值

我有一个回收视图，里面有卡片。每张卡都有一张公司和价格的清单

在我的onBindViewHolder中，我有一个单击事件，我想在该事件中获取Cardview中该行的TextView的价格

每次我点击时，我总是会得到单个卡片中最上面的物品的价值/价格，而不会得到我点击的物品的价格

bindData方法的data参数是我用来在Cardview中创建项目列表的参数

任何帮助都将不胜感激。我只需要在单击的位置获取正确文本视图的值

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

 public static class ViewHolder extends RecyclerView.ViewHolder   {

    protected RelativeLayout mCardBodyLayout;
    protected TextView mTitleTextView; 

    public ViewHolder(View v) {
        super(v);
        mCardBodyLayout = (RelativeLayout) v.findViewById(R.id.card_body);
        mTitleTextView = (TextView) v.findViewById(R.id.card_title); 
    }

    public void bindData(StockCategoryModel data, Context ctx) {
        this.mTitleTextView.setText(data.getCategoryName());

        TableLayout tableLayout = new TableLayout(ctx);

        int rows = data.getStockList().size();

        for (int r = 0; r < rows; r++) {
            TableRow row = new TableRow(ctx);

            TableLayout.LayoutParams rowParams = new TableLayout.LayoutParams (TableLayout.LayoutParams.MATCH_PARENT,TableLayout.LayoutParams.WRAP_CONTENT);
            rowParams.setMargins(0, 0, 0, 16);
            row.setLayoutParams(rowParams);

            LinearLayout rl = new LinearLayout(ctx);
            rl.setOrientation(LinearLayout.VERTICAL);

            Integer priceColor = SharedUtilities.getColor(data.getStockList().get(r).priceChange, ctx);

            //price row
            LinearLayout priceLayout = new LinearLayout(ctx);
            priceLayout.setOrientation(LinearLayout.HORIZONTAL);
            priceLayout.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
            priceLayout.setWeightSum(4);

            LinearLayout.LayoutParams textViewParams = new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.WRAP_CONTENT, 1f);

            final TextView price_text = new TextView(ctx);
            price_text.setTag("priceTag");
            price_text.setText(data.getStockList().get(r).price);
            price_text.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14);
            price_text.setTextColor(Color.BLACK);
            price_text.setLayoutParams(textViewParams);
            priceLayout.addView(price_text);

            //company row
            final TextView name_text = new TextView(ctx);
            name_text.setText(data.getStockList().get(r).company); 
            name_text.setTextColor(Color.GRAY);
            name_text.setLayoutParams( new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.MATCH_PARENT));
            name_text.setMaxWidth(700);
            name_text.setEllipsize(TextUtils.TruncateAt.END);
            name_text.setMaxLines(1);
            name_text.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14);

            rl.addView(priceLayout);
            rl.addView(name_text);
            row.addView(rl);

            tableLayout.setStretchAllColumns(true);
            tableLayout.addView(row);
        }
        mCardBodyLayout.addView(tableLayout);
    }

}

private List<StockCategoryModel> mDataset;
private Context mContext;

// Constructor
public StockCardAdapter(List<StockCategoryModel> dataset, Context ctx) {
    this.mDataset = dataset;
    this.mContext = ctx;
}

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

// Create new views (invoked by the layout manager)
@Override
public StockCardAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup,
                                                      int viewType) {
    // create a new view
    View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.card_layout, viewGroup, false);

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

// Replace the contents of a view (invoked by the layout manager)
@Override
public void onBindViewHolder(final ViewHolder holder, int position) {

    holder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override public void onClick(View v2) {
            final TextView textViewName = (TextView) v2.findViewWithTag("priceTag"); ;
            final String priceTag = textViewName.getText().toString();
        }
    });

    holder.bindData(mDataset.get(position), mContext);
}

// Return the size of your dataset (invoked by the layout manager)
@Override
public int getItemCount() {
    return mDataset.size();
}

}

---

textView的标记在所有情况下都是相同的，这就是它重复的原因，只有第一项的值。通常通过将priceTag与position连接来分配唯一标记。对代码进行如下更改：

public void bindData(StockCategoryModel data, Context ctx, int position) {
 //All your code
  //..
 //...


 final TextView price_text = new TextView(ctx);
 price_text.setTag("priceTag"+String.valueOf(position));
}

在onBindViewHolder中：

final TextView textViewName = (TextView) v2.findViewWithTag("priceTag"+String.valueOf(position)); 


holder.bindData(mDataset.get(position), mContext,position);

从标记中查找子视图 请叫它

TextView priceTagTextView =(TextView)getViewsByTag(mCardBodyLayout, "priceTag").get(0);  



private ArrayList<View> getViewsByTag(ViewGroup root, String tag){
    ArrayList<View> views = new ArrayList<View>();
    final int childCount = root.getChildCount();
    for (int i = 0; i < childCount; i++) {
        final View child = root.getChildAt(i);
        if (child instanceof ViewGroup) {
            getViewsByTag((ViewGroup) child, tag));
        }

        final Object tagObj = child.getTag();
        if (tagObj != null && tagObj.equals(tag)) {
            views.add(child);
        }

    }
    return views;
}

---

您需要做的是分别为每一行设置一个单击侦听器

为什么总是得到第一行的值

这个代码

holder.itemView.setOnClickListener(new View.OnClickListener() {
    @Override public void onClick(View v2) {
        final TextView textViewName = (TextView) v2.findViewWithTag("priceTag"); ;
        final String priceTag = textViewName.getText().toString();
    }
});

为每个列表项（整个卡片）设置单击侦听器。这意味着，每当用户在卡视图边界内单击时，就会触发此回调。但是，谁会成为v2？它将始终是我们将侦听器设置为的视图—在本例中—整个卡片

这意味着每次调用v2.findViewWithTagpriceTag；您正在搜索整个卡的第一个子项，该子项具有标签priceTag，这是卡中的顶部项目

如何解决这个问题

如果您想确定正在单击哪个子级，则必须直接为每个子级设置一个单击侦听器

例如，请尝试以下代码，请参阅添加的注释：

public class StockCardAdapter extends 

RecyclerView.Adapter<StockCardAdapter.ViewHolder> {

 public static class ViewHolder extends RecyclerView.ViewHolder   {

    protected RelativeLayout mCardBodyLayout;
    protected TextView mTitleTextView; 

    public ViewHolder(View v) {
        super(v);
        mCardBodyLayout = (RelativeLayout) v.findViewById(R.id.card_body);
        mTitleTextView = (TextView) v.findViewById(R.id.card_title); 
    }

    public void bindData(StockCategoryModel data, Context ctx, View.OnClickListener listener) {
        this.mTitleTextView.setText(data.getCategoryName());

        TableLayout tableLayout = new TableLayout(ctx);

        int rows = data.getStockList().size();

        for (int r = 0; r < rows; r++) {
            TableRow row = new TableRow(ctx);

            TableLayout.LayoutParams rowParams = new TableLayout.LayoutParams (TableLayout.LayoutParams.MATCH_PARENT,TableLayout.LayoutParams.WRAP_CONTENT);
            rowParams.setMargins(0, 0, 0, 16);
            row.setLayoutParams(rowParams);

            LinearLayout rl = new LinearLayout(ctx);
            rl.setOrientation(LinearLayout.VERTICAL);

            Integer priceColor = SharedUtilities.getColor(data.getStockList().get(r).priceChange, ctx);

            //price row
            LinearLayout priceLayout = new LinearLayout(ctx);
            priceLayout.setOrientation(LinearLayout.HORIZONTAL);
            priceLayout.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
            priceLayout.setWeightSum(4);

            LinearLayout.LayoutParams textViewParams = new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.WRAP_CONTENT, 1f);

            final TextView price_text = new TextView(ctx);
            price_text.setTag("priceTag");
            price_text.setText(data.getStockList().get(r).price);
            price_text.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14);
            price_text.setTextColor(Color.BLACK);
            price_text.setLayoutParams(textViewParams);
            priceLayout.addView(price_text);

            //company row
            final TextView name_text = new TextView(ctx);
            name_text.setText(data.getStockList().get(r).company); 
            name_text.setTextColor(Color.GRAY);
            name_text.setLayoutParams( new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.MATCH_PARENT));
            name_text.setMaxWidth(700);
            name_text.setEllipsize(TextUtils.TruncateAt.END);
            name_text.setMaxLines(1);
            name_text.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14);

            rl.addView(priceLayout);
            rl.addView(name_text);
            row.addView(rl);

            tableLayout.setStretchAllColumns(true);
            tableLayout.addView(row);

            // *ADDED* set the listener directly to each row
            row.setOnClickListener(listener);

        }
        mCardBodyLayout.addView(tableLayout);
    }

}

private List<StockCategoryModel> mDataset;
private Context mContext;

// Constructor
public StockCardAdapter(List<StockCategoryModel> dataset, Context ctx) {
    this.mDataset = dataset;
    this.mContext = ctx;
}

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

// Create new views (invoked by the layout manager)
@Override
public StockCardAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup,
                                                      int viewType) {
    // create a new view
    View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.card_layout, viewGroup, false);

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

// Replace the contents of a view (invoked by the layout manager)
@Override
public void onBindViewHolder(final ViewHolder holder, int position) {
    // *ADDED* Send the callback to the bind method
    holder.bindData(mDataset.get(position), mContext, new View.OnClickListener() {
        @Override public void onClick(View v2) {
            final TextView textViewName = (TextView) v2.findViewWithTag("priceTag"); ;
            final String priceTag = textViewName.getText().toString();
        }
    }));
}

// Return the size of your dataset (invoked by the layout manager)
@Override
public int getItemCount() {
    return mDataset.size();
}

}

注:

---

这不是处理RecyclerView的正确方法—在本例中，您永远不希望在数据绑定中创建新的对象new View.OnClickListener{}—这将降低性能。但这是另一个问题：

这对我不起作用。我仍然有同样的问题。单击时，我的OnBindViewHolderTerry holder.getAdapterPosition中的position值始终为0，而不是在onBindViewHolder中作为参数传递position的position。让我知道这是否有效。我将相应地编辑answet，但这也不起作用。holder.getAdapterPosition在我单击时始终为0。我现在在应用程序冻结方面也遇到一些问题。是否有更好的地方进行onclickevent侦听器？我想知道将其放入onBindViewHolder是否会导致问题？请尝试将setHasStableIdstrue放入recyclerview构造函数中。一个更好的放置侦听器的地方是在您的Recyclerview支架内。这样做，看看它是否有效。一定要让我知道什么是有效的，因为我现在对此也很好奇看起来如果我在holder.itemView.setOnClickListener上放置一个断点，IDE就会冻结。我想我不会在这里设置断点；只返回卡中的第一个元素。我在onBindViewHolder中尝试了此操作，但单击时我的位置始终为0。我也在我的viewHolder中尝试了这个，但我不知道该设置什么。get0在那里。请检查它。这已更改为GetViewsByTag并检查ArrayList大小。当我尝试在viewholder中调用更新的代码时，我遇到了与以前相同的问题。当我在onBindViewHolder中尝试它时，我得到了IndexOutofBoundsCeptioni很抱歉，您可以将源代码上传到github上吗？这似乎很有效。非常感谢你。我现在没有时间，但会回来仔细复习，并标记答案。