使用Picasso在DataObject中加載RecyclerView中的圖像

我想在「RecyclerViewAdapter」中使用picasso庫。我想爲每個條目顯示不同的圖像。它適用於我當我只使用文本... 我用我在getDataSet（）中使用的數據解析JSON文件。使用Picasso在DataObject中加載RecyclerView中的圖像

目前我不知道如何使用畢加索函數將圖像添加到數據集。

錯誤=>int imageUrl =畢加索。

CardViewActivity.java

public class CardViewActivity extends AppCompatActivity { 

    private RecyclerView mRecyclerView; 
    private RecyclerView.Adapter mAdapter; 
    private RecyclerView.LayoutManager mLayoutManager; 
    private static String LOG_TAG = "CardViewActivity"; 

    // url to make request - Hole fixe Coupons (max. 100) 
    private static String url = "http://json.file"; 

    // JSON Node names 
    private static final String TAG_FIXES = "result"; 
    private static final String TAG_TITEL = "titel"; 
    private static final String TAG_BESCHREIBUNG = "beschreibung"; 

    // contacts JSONArray 
    JSONArray fixes = null; 

    ImageView image; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_card_view); 
     /* 
     image = (ImageView) findViewById(R.id.image_view); 

     Picasso.with(getApplicationContext()) 
       .load("http://1UVZ8A9DRLH/bild.jpg") 
       .placeholder(R.drawable.logo) 
       .fit().centerCrop().into(image); 
     */ 
     mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view); 
     mRecyclerView.setHasFixedSize(true); 
     mLayoutManager = new LinearLayoutManager(this); 
     mRecyclerView.setLayoutManager(mLayoutManager); 
     mAdapter = new MyRecyclerViewAdapter(getDataSet()); 
     mRecyclerView.setAdapter(mAdapter); 

     // Code to Add an item with default animation 
     //((MyRecyclerViewAdapter) mAdapter).addItem(obj, index); 

     // Code to remove an item with default animation 
     //((MyRecyclerViewAdapter) mAdapter).deleteItem(index); 
    } 


    @Override 
    protected void onResume() { 
     super.onResume(); 
     ((MyRecyclerViewAdapter) mAdapter).setOnItemClickListener(new MyRecyclerViewAdapter 
       .MyClickListener() { 
      @Override 
      public void onItemClick(int position, View v) { 
       Log.i(LOG_TAG, " Clicked on Item " + position); 
      } 
     }); 
    } 

    private ArrayList<DataObject> getDataSet() { 
     ArrayList results = new ArrayList<DataObject>(); 

     // Creating JSON Parser instance 
     JSONParser jParser = new JSONParser(); 

     // getting JSON string from URL 
     JSONObject json = jParser.getJSONFromUrl(url); 

     try { 
      // Getting Array of fixes 
      fixes = json.getJSONArray(TAG_FIXES); 

      // looping through All Contacts 
      for(int i = 0; i < fixes.length(); i++){ 
       JSONObject f = fixes.getJSONObject(i); 

       // Storing each json item in variable 
       String titel = f.getString(TAG_TITEL); 
       String description = f.getString(TAG_BESCHREIBUNG); 
       int imageUrl = Picasso.with(getApplicationContext()) 
         .load("http://1UVZ8A9DRLH/bild.jpg") 
         .placeholder(R.drawable.logo) 
         .fit().centerCrop().into(image); 

       DataObject obj = new DataObject(
         titel, 
         description, 
         imageUrl 
       ); 
       results.add(i, obj); 

      } 
     } catch (JSONException e) { 
      e.printStackTrace(); 
     } 

     return results; 
    } 
}

DataObject.java

public class DataObject { 
    private String mText1; 
    private String mText2; 
    private int imageUrl; 

    DataObject(String text1, String text2, int imageUrl){ 
     mText1 = text1; 
     mText2 = text2; 
     imageUrl = imageUrl; 
    } 

    public String getmText1() { return mText1; } 

    public void setmText1(String mText1) { 
     this.mText1 = mText1; 
    } 

    public String getmText2() { 
     return mText2; 
    } 

    public void setmText2(String mText2) { this.mText2 = mText2; } 

    public int getImageUrl() { return imageUrl; } 

    public void getImageUrl(int imageUrl) { 
     this.imageUrl = imageUrl; 
    } 
}

MyRecyclerViewAdapter

public class MyRecyclerViewAdapter extends RecyclerView 
     .Adapter<MyRecyclerViewAdapter 
     .DataObjectHolder> { 
    private static String LOG_TAG = "MyRecyclerViewAdapter"; 
    private ArrayList<DataObject> mDataset; 
    private static MyClickListener myClickListener; 

    public static class DataObjectHolder extends RecyclerView.ViewHolder 
      implements View 
      .OnClickListener { 
     TextView label; 
     ImageView imgViewIcon; 
     TextView description; 

     public DataObjectHolder(View itemView) { 
      super(itemView); 
      label = (TextView) itemView.findViewById(R.id.textView); 
      imgViewIcon = (ImageView) itemView.findViewById(R.id.image_view); 
      description = (TextView) itemView.findViewById(R.id.textView2); 
      Log.i(LOG_TAG, "Adding Listener"); 
      itemView.setOnClickListener(this); 
     } 

     @Override 
     public void onClick(View v) { 
      myClickListener.onItemClick(getAdapterPosition(), v); 
     } 
    } 

    public void setOnItemClickListener(MyClickListener myClickListener) { 
     this.myClickListener = myClickListener; 
    } 

    public MyRecyclerViewAdapter(ArrayList<DataObject> myDataset) { 
     mDataset = myDataset; 
    } 

    @Override 
    public DataObjectHolder onCreateViewHolder(ViewGroup parent, 
               int viewType) { 
     View view = LayoutInflater.from(parent.getContext()) 
       .inflate(R.layout.card_view_row, parent, false); 

     DataObjectHolder dataObjectHolder = new DataObjectHolder(view); 
     return dataObjectHolder; 
    } 

    @Override 
    public void onBindViewHolder(DataObjectHolder holder, int position) { 
     holder.label.setText(mDataset.get(position).getmText1()); 
     holder.imgViewIcon.setImageResource(mDataset.get(position).getImageUrl()); 
     holder.description.setText(mDataset.get(position).getmText2()); 
    } 

    public void addItem(DataObject dataObj, int index) { 
     mDataset.add(index, dataObj); 
     notifyItemInserted(index); 
    } 

    public void deleteItem(int index) { 
     mDataset.remove(index); 
     notifyItemRemoved(index); 
    } 

    @Override 
    public int getItemCount() { 
     return mDataset.size(); 
    } 

    public interface MyClickListener { 
     public void onItemClick(int position, View v); 
    } 
}

來源

2017-06-05 RedLeffer

Firts設置IMAGEURL作爲一個數據對象的屬性：

那麼你的適配器上執行以下操作：

@Override 
public void onBindViewHolder(DataObjectHolder holder, int position) { 
    holder.label.setText(mDataset.get(position).getmText1()); 
    Picasso.with(context).load(mDataset.get(position).getImageUrl()).into(holder.imgViewIcon); 
    holder.description.setText(mDataset.get(position).getmText2()); 
}

來源

2017-06-05 20:08:45

感謝喬納森。但有一個問題：不兼容的類型需要int找到的字符串爲「int imageUrl = f.getString（TAG_IMAGE）;」 – RedLeffer

imageUrl應該是一個持有url圖像的字符串，比如說http://www.imageserver.com/yourimageid.jpg –

好的，謝謝！現在它工作:-) – RedLeffer

在您的onBindViewHolder中致電Picasso將圖像加載到ImageView。就像這樣：

Picasso.with(context).load("url").into(imageView);

來源

2017-06-05 20:04:15

使用Picasso在DataObject中加載RecyclerView中的圖像

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