スクロールせずにlistViewに画像を表示しますか？

Question

私はGridViewを使って電池の種類の画像を表示しました。ユーザーが画像をクリックすると、その特定のバッテリーの機能が次のページに印刷されます。イメージと機能がサーバーからフェッチされています。問題は、GridViewを開いたときに最初のバッテリーイメージが表示されているが、2〜3回スクロールした後にのみ他のバッテリーイメージがGridViewに表示されているということです。しかし、私がGridViewを開いたら、すべての画像を表示したい。

private void getDatasFromIntent() { 
    alHM = new ArrayList<>(); 
    Intent intent = getIntent(); 
    String typeResp = intent.getStringExtra("IMG_S"); 
    try { 
     JSONObject jsonObject = new JSONObject(typeResp); 
     JSONArray jsonArray = jsonObject.getJSONArray("process"); 
     for (int i = 0; i < jsonArray.length(); i++) { 
      HashMap<String, String> hm = new HashMap<>(); 
      JSONObject bat_json = jsonArray.getJSONObject(i); 
      String battery_featues_id = bat_json.getString("battery_featues_id"); 
      String battery = bat_json.getString("battery_type"); 
      String battery_image = bat_json.getString("battery_image"); 
      battery_image = battery_image.replace("\\", ""); 
      hm.put("battery_featues_id", battery_featues_id); 
      hm.put("battery_type", battery); 
      hm.put("battery_image", battery_image); 
      alHM.add(hm); 
     } 

     // prepared arraylist and passed it to the Adapter class 
     mAdapter = new GridviewAdapter(this, alHM); 

     // Set custom adapter to gridview 
     GridView gridView = (GridView) findViewById(R.id.gridView1); 
     gridView.setAdapter(mAdapter); 

     // Implement On Item click listener 
     gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> arg0, View arg1, int position, 
            long arg3) { 
       Toast.makeText(SampleBatteryList.this, "a: " + mAdapter.getItem(position), Toast.LENGTH_SHORT).show(); 

      } 
     }); 

    } catch (JSONException e) { 
     e.printStackTrace(); 
    } 
} 
public class GridviewAdapter extends BaseAdapter { 
    private ArrayList<HashMap<String, String>> list; 
    private final SampleBatteryList activity; 

    public GridviewAdapter(SampleBatteryList sampleBatteryList, 
    ArrayList<HashMap<String, String>> alHM) { 
     this.activity = sampleBatteryList; 
     this.list = alHM; 
     Log.d("VOLLY", "ADP :" + alHM); 
    } 

    @Override 
    public int getCount() { 
     return list.size(); 
    } 

    @Override 
    public Object getItem(int i) { 
     return list.get(i); 
    } 
    @Override 
    public long getItemId(int i) { 
     return i; 
    } 

    public class ViewHolder { 
     public ImageView imgViewFlag; 
     public TextView txtViewTitle; 
     public Button button; 
     ViewHolder view; 
    } 
    @Override 
    public View getView(int i, View contentView, ViewGroup viewGroup) { 
     Log.d("VOLLY", "INT : " + i); 
     ViewHolder view; 
     LayoutInflater inflator = activity.getLayoutInflater(); 
     if (contentView == null) { 
      view = new ViewHolder(); 
      contentView = inflator.inflate(R.layout.grid_content_sub, null); 
      view.txtViewTitle = (TextView) 
      contentView.findViewById(R.id.tv_battery_type); 
      view.imgViewFlag = (ImageView)  
      contentView.findViewById(R.id.img_battery); 
      view.button = (Button) 
      contentView.findViewById(R.id.btn_card_type); 
      contentView.setTag(view); 
     } else { 
      view = (ViewHolder) contentView.getTag(); 
      view.txtViewTitle.setText(list.get(i).get("battery_type")); 
      view.imgViewFlag.setImageResource(R.drawable.branded_logo); 
      view.imgViewFlag.setImageDrawable(null); 
      Picasso.with(SampleBatteryList.this) 
        .load(Links._img + list.get(i).get("battery_image")) 
        .fit().centerCrop() 
        .into(view.imgViewFlag); 
        final int ii = i; 
       final Button btn = view.button; 
       view.button.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View view) { 
        btn.setText(list.get(ii).get("battery_type")); 
        btn.setSingleLine(true); 

        YoYo.with(Techniques.TakingOff).duration(2000).playOn(btn); 
        showDialog(); 
       Log.d("VOLLY", "id :" +list.get(ii).get("battery_featues_id")); 
       callVollyForFeature(list.get(ii).get("battery_featues_id")); 
       } 
      }); 
     } 

     return contentView; 
    } 
} 

Answer 1

ここでは、ビューホルダークラスを使用していますが、初期化後にpartとassignの値の部分がifとelseにあるため、値が表示されません。

@Override 
    public View getView(int i, View contentView, ViewGroup viewGroup) { 
     Log.d("VOLLY", "INT : " + i); 
     ViewHolder view; 
     LayoutInflater inflator = activity.getLayoutInflater(); 
     if (contentView == null) { 
      view = new ViewHolder(); 
      contentView = inflator.inflate(R.layout.grid_content_sub, null); 
      view.txtViewTitle = (TextView) 
      contentView.findViewById(R.id.tv_battery_type); 
      view.imgViewFlag = (ImageView)  
      contentView.findViewById(R.id.img_battery); 
      view.button = (Button) 
      contentView.findViewById(R.id.btn_card_type); 
      contentView.setTag(view); 
     }else{ 
      view = (ViewHolder) contentView.getTag(); 
} 
      view.txtViewTitle.setText(list.get(i).get("battery_type")); 
      view.imgViewFlag.setImageResource(R.drawable.branded_logo); 
      view.imgViewFlag.setImageDrawable(null); 
      Picasso.with(SampleBatteryList.this) 
        .load(Links._img + list.get(i).get("battery_image")) 
        .fit().centerCrop() 
        .into(view.imgViewFlag); 
        final int ii = i; 
       final Button btn = view.button; 
       view.button.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View view) { 
        btn.setText(list.get(ii).get("battery_type")); 
        btn.setSingleLine(true); 

        YoYo.with(Techniques.TakingOff).duration(2000).playOn(btn); 
        showDialog(); 
       Log.d("VOLLY", "id :" +list.get(ii).get("battery_featues_id")); 
       callVollyForFeature(list.get(ii).get("battery_featues_id")); 
       } 
      }); 


     return contentView; 
    }