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。