Question

我有RecycleView里面有卡片。每张卡都有公司和价格清单。

在我的onBindViewHolder我有一个点击事件，我希望在TextView内的那一行中获得Cardview的价格。

每次点击我总是得到个人卡内顶级商品的价值/价格，永远不会得到我点击的商品的价格。

我使用bindData方法的数据参数来创建Cardview内的项目列表。

非常感谢任何帮助。我只需要获取正在点击的正确TextView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();
}

}

Answer 1

您需要做的是分别为每一行设置一个点击监听器。

为什么总是获得第一行值？

此代码，

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();
    }
});

为每个列表项设置一个点击监听器 - 整张卡。这意味着每次用户在卡片视图边界内单击时，都会触发此回调。但是，谁将是v2？它始终是我们设置监听器的视图 - 在本例中是整个卡。

这意味着每次拨打v2.findViewWithTag("priceTag");时，您都会搜索整张卡片的第一个孩子，该卡片上有标签＆＃34; priceTag＆＃34; - 这是＆＃34; top＆＃34;卡中的项目。

如何解决此问题？

如果您想识别被点击的孩子 - 您必须直接为每个孩子设置点击监听器。

举个例子，试试这段代码（参见 ADDED 评论）：

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();
}

}

注意：

这不是处理RecyclerView的正确方法 - 您永远不想在数据绑定中创建新对象（在本例中为new View.OnClickListener() {}） - 这会降低性能。但这是另一个问题：）

Answer 2

textView的标签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"与位置连接来分配唯一标记。在代码中进行如下更改：

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));
}

并在你的onBindViewHolder中：

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


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

Answer 3

从Tag中查找子视图请来电。

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;
}

从recycleview获取cardview中textview的价值

3 个答案: