Android - 即使已加載圖像也不會顯示

我設置了我的圖像查看3210，my layout height to wrapcontent。 imageview的圖像通過url加載。發生的事情是，當我繪製視圖的時候，由於圖像尚未加載，它只會繪製layout_width。但在圖像已經加載時，高度不再繪製，因此不會顯示圖像。它只會顯示，如果我來回滾動，因爲，我想那是視圖將重繪的時間。有什麼辦法可以解決這個問題嗎？使用invalidate()沒有工作。也許我做錯了嗎？Android - 即使已加載圖像也不會顯示

我會剛剛發佈的我的代碼片段：這是getView的MyAdapter延伸BaseAdapter：

public View getView(int position, View convertView, ViewGroup parent){ 
    ViewHolder holder = null; 

    LayoutInflater inflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE); 

    Typeface typeFaceMyriadReg = Typeface.createFromAsset(context.getAssets(), MYRIAD_REG); 


    if(convertView == null){ 
     convertView = inflater.inflate(R.layout.shop_list_layout, null); 
     holder = new ViewHolder(); 
     holder.txtShopName = (TextView) convertView.findViewById(R.id.name); 
     holder.txtShopName.setTypeface(typeFaceMyriadReg); 
     holder.txtShopDesc = (TextView) convertView.findViewById(R.id.desc); 
     holder.txtShopDesc.setTypeface(typeFaceMyriadReg); 
     holder.imageView = (ImageView) convertView.findViewById(R.id.prof_pic); 
     holder.progBar = (ProgressBar) convertView.findViewById(R.id.img_progress); 



     convertView.setTag(holder); 
    }else{ 
     holder = (ViewHolder) convertView.getTag(); 
    } 
     imageLoader=new ImageLoader(context.getApplicationContext(), holder.progBar); 

    ShopRowItem shopItem = (ShopRowItem) getItem(position); 

    holder.txtShopName.setText(shopItem.getShopName()); 
    holder.txtShopDesc.setText(shopItem.getShopDesc()); 
    imageLoader.DisplayImage(shopItem.getImageUrl(), holder.imageView); 

    return convertView; 
}

那麼ImageLoder的一部分：

public void DisplayImage(String url, ImageView imageView) 
{ 
    imageViews.put(imageView, url); 
    Bitmap bitmap=memoryCache.get(url); 
    if(bitmap!=null){ 
     imageView.setImageBitmap(bitmap); 
     progressBar.setVisibility(View.VISIBLE); 
    } 
    else 
    { 
     queuePhoto(url, imageView); 
     progressBar.setVisibility(View.VISIBLE); 

    } 
} 

// ... 
// ... 

    //Used to display bitmap in the UI thread 
class BitmapDisplayer implements Runnable 
{ 
    Bitmap bitmap; 
    PhotoToLoad photoToLoad; 
    public BitmapDisplayer(Bitmap b, PhotoToLoad p){bitmap=b;photoToLoad=p;} 
    public void run() 
    { 
     if(imageViewReused(photoToLoad)) 
      return; 
     if(bitmap!=null){ 

      //should i do recalculations and adjustments here? ? ? 

      photoToLoad.imageView.setImageBitmap(bitmap); 
      progressBar.setVisibility(View.GONE); 
     } 
     else{ 
       photoToLoad.imageView.setImageResource(stub_id); 
       progressBar.setVisibility(View.VISIBLE); 
     } 
    } 
}

來源

2013-04-05 elL

可以解決這個問題通過在你的圖像視圖中放置一些加載圖像，直到你從服務器上獲取圖像數據..

public void DisplayImage(String url, ImageView imageView) 
{ 
imageViews.put(imageView, url); 
Bitmap bitmap=memoryCache.get(url); 
if(bitmap!=null){ 
    imageView.setImageBitmap(bitmap); 
    progressBar.setVisibility(View.VISIBLE); 
} 
else 
{ 
    queuePhoto(url, imageView); 
//add this line of code here..... 
    imageView.setImageResource(R.drawable.your_image_placeholder); 
    progressBar.setVisibility(View.VISIBLE); 

} 
}

來源

2013-04-05 05:04:16 Akhil

Android - 即使已加載圖像也不會顯示

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