2014-01-26 11 views
0

我試圖從Parse.com中獲取ImageViews數組中的圖像。但是,該應用程序在ImageLoader類中與nullpointerException一起崩潰。我在parse.com和6個ImageView中有5個圖像。一個ImageView將圖像設置爲可繪製文件夾。因此,5個圖像會從Imageviews 1-6的數組中解析出來動態加載。 HomeActivity是:ImageLoader中的異常從Parse.com中提取圖像

ImageView ad1,ad2,ad3,ad4,ad5,ad6; 
List<ParseObject> ob; 
private ImageView[] imgs = new ImageView[5]; 
int k=0; 
public ImageLoader imgl; 
中的onCreate()

imgl=new ImageLoader(getApplicationContext()); 
ad1=(ImageView) findViewById(R.id.ad1); 
    ad2=(ImageView) findViewById(R.id.ad2); 
    ad3=(ImageView) findViewById(R.id.ad3); 
    ad4=(ImageView) findViewById(R.id.ad4); 
    ad5=(ImageView) findViewById(R.id.ad5); 
    ad6=(ImageView) findViewById(R.id.ad6); 
    imgs[0] = ad2; 
    imgs[1] = ad3; 
    imgs[2] = ad4; 
    imgs[3] = ad5; 
    imgs[4] = ad6; 
try { 
     // Locate the class table named "Footer" in Parse.com 
     ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("Adverts"); 
     query.orderByDescending("updatedAt"); 
     query.whereEqualTo("Status", true); 
     ob = query.find(); 
     for (ParseObject country : ob) { 
      ParseFile image = (ParseFile) country.get("imageFile"); 
      imgl.DisplayImage(image.getUrl(), imgs[k]); 
      k=k+1; 
      System.out.println("the urls are"+image.getUrl()); 

     } 
    } catch (ParseException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 

在ImageLoader的類:

public ImageLoader(Context context) { 
    fileCache = new FileCache(context); 
    executorService = Executors.newFixedThreadPool(5); 
} 

final int stub_id = R.drawable.ic_launcher; 

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

我在imageView.setImageResource(stub_id);

越來越空指針請幫助。

回答

0

唯一原因一個空指針可以出現一個佔位符烏爾ImageView的是空...可能是 你必須仔細檢查,查看是否正確

通過