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從recycleview獲取cardview中的textview的值

[英]Get value of textview in cardview from recycleview

 原文  2017-08-05 23:27:08  1   3    java/ android/ android-recyclerview

問題描述

我有一個RecycleView ，里面有卡。 每張卡都有公司和價格的列表。

在我的onBindViewHolder我有一個click事件，我想在Cardview那一行中獲取TextView的價格。

每次我單擊時，我總是會得到單個卡內最上面物品的價格/價格，而永遠不會得到我所點擊物品的價格。

bindData方法的數據參數是我用來在Cardview內創建項目列表的東西。

任何幫助將不勝感激。 我只需要獲取我單擊的正確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();
}

}

3 個解決方案

解決方案1
 1 已采納  2017-08-06 11:25:08

您需要做的是將點擊偵聽器分別設置到每一行。

為什么總是得到第一行的值？

此代碼， 

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();
    }
});

為每個列表項（整個卡片）設置一個點擊監聽器。 這意味着，每次用戶在卡片視圖范圍內單擊時，都會觸發此回調。 但是 ，誰將成為v2 ？ 它將始終是我們將偵聽器設置為的視圖（在這種情況下為整個卡）。

這意味着每次調用v2.findViewWithTag("priceTag"); 您正在搜索帶有“ priceTag”標簽的整個卡片的第一個子代，該標簽是卡片中的“ top”項目。

如何解決這個問題？

如果要確定正在點擊哪個孩子，則必須直接為每個孩子設置點擊監聽器。

作為示例，請嘗試以下代碼（請參閱添加的注釋）： 

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：

這不是處理RecyclerView的正確方法-永遠不要在數據綁定內創建新對象（在這種情況下為new View.OnClickListener() {} ），這會降低性能。 但這是另一個問題:)

解決方案2
 0  2017-08-05 23:51:43

在所有情況下，textView的標簽都是相同的，這就是為什么它重復的原因，僅是第一項的值。 通常，通過將"priceTag"與位置連接來分配唯一的標簽。 在代碼中進行如下更改： 

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));
}

並在您的onBindViewHolder中： 

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


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

解決方案3
 0  2017-08-06 00:55:40

從Tag查找子視圖，請調用它。 

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;
}

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