2015-07-12 90 views
1

我有一個ReciclerView,它使用一個名爲「SimpleItemRecyclerViewAdapter」的適配器。 ReciclerView中的每個項目都位於項目的「drawable」文件夾中。我能夠在TextView上設置測試,但我不確定如何爲圖像執行此操作。這裏是我得到的輸出...圖像應該出現在黑色方塊上,並且是一個ImageView小部件。在ViewAdapter上加載圖像資源

enter image description here

這裏是我的適配器代碼:

package uk.co.example.calculator.adapters; 

import android.support.v7.widget.RecyclerView; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ImageView; 
import android.widget.TextView; 

import java.util.List; 

import uk.co.example.calculator.R; 
import uk.co.example.calculator.ui.activities.Currency; 

public class SimpleItemRecyclerViewAdapter extends RecyclerView.Adapter<SimpleItemRecyclerViewAdapter.RecyclerViewSimpleTextViewHolder> { 

    // The items to display in your RecyclerView 
    private List<Currency> items; 

    // Provide a suitable constructor (depends on the kind of dataset) 
    public SimpleItemRecyclerViewAdapter(List<Currency> items) { 
     this.items = items; 
    } 

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

    // Replace the contents of a view (invoked by the layout manager) 
    // Involves populating data into the item through holder 
    @Override 
    public void onBindViewHolder(RecyclerViewSimpleTextViewHolder holder, int position) { 
     Currency currency = items.get(position); 
     holder.getName().setText(currency.name); 
     holder.getSymbol().setText(currency.symbol); 
     holder.getAsset().?????????; // WHAT SHOULD I PUT HERE TO LOAD THE IMAGE FROM THE RAW FOLDER 
    } 

    // Create new items (invoked by the layout manager) 
    // Usually involves inflating a layout from XML and returning the holder 
    @Override 
    public RecyclerViewSimpleTextViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) { 
     View itemView = LayoutInflater.from(viewGroup.getContext()). 
       inflate(R.layout.currency_list_card_layout, viewGroup, false); 
     return new RecyclerViewSimpleTextViewHolder(itemView); 
    } 


    public class RecyclerViewSimpleTextViewHolder extends RecyclerView.ViewHolder { 
     private TextView name; 
     private TextView symbol; 
     private ImageView asset; 

     public RecyclerViewSimpleTextViewHolder(View v) { 
      super(v); 
      name = (TextView) v.findViewById(R.id.currency_name); 
      symbol = (TextView) v.findViewById(R.id.currency_symbol); 
      asset = (ImageView) v.findViewById(R.id.currency_asset); 
     } 

     public TextView getName() { 
      return name; 
     } 

     public TextView getSymbol() { 
      return symbol; 
     } 

     public ImageView getAsset() { 
      return asset; 
     } 

    } 
} 

如何顯示包含在文件夾中繪製圖像上的任何詳細的幫助將不勝感激。

回答

2

您可以從內onBindViewHolder

訪問您的ImageView例如,放入onBindViewHolder:

Resources resources = getResources(); 
holder.getAsset().setImageDrawable(resources.getDrawable(R.drawable.myimage)); 
+0

Hi @ Jonty800。謝謝回覆。我認爲你的回答很好,但是在實施你的解決方案後,Android Studio會警告我「無法解析符號getResources」。任何想法如何我可以解決這個錯誤?提前致謝。 – CBA110

+0

@ CBA110 getResources是Activity或Context類的一部分。在一個適配器中,你必須傳遞一個上下文。因此,將適配器的構造更改爲'public SimpleItemRecyclerViewAdapter(列表項目,Context上下文)',然後使用'this.context = context;'設置一個全局變量。然後你可以做'context.getResources('需要的時候 – Jonty800

2

嘗試使用圖片庫進行圖片加載。我的建議是畢加索(https://github.com/square/picasso

有了它,你可以很容易地通過簡單地調用加載從繪製的圖像:

Picasso.with(context).load(R.drawable.drawableName).into(holder.getAsset());