我尝试使用universal-image-loader创建图像ListView。目前，没有图像出现或加载。我发现来自getView()的{{1}}被多次调用。
例如，如果列表大小为3，那么ImageAdapter应该调用3次，但在我的代码中，调用24次!!!
这是我的源代码。
getView() public class MainActivity extends Activity{
AsyncTask<Void, Void, Void> asyncTask, registerTask;
DisplayImageOptions options;
ArrayList<HashMap<String, Object>> feedList = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int cacheSize = ((ActivityManager)getSystemService(Context.ACTIVITY_SERVICE)).getMemoryClass() * 1024 * 1024 / 8;
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(this)
.memoryCacheExtraOptions(metrics.widthPixels, metrics.heightPixels)
.diskCacheExtraOptions(metrics.widthPixels, metrics.heightPixels, null)
.memoryCache(new LruMemoryCache(cacheSize))
.memoryCacheSize(cacheSize)
.memoryCacheSizePercentage(13)
.diskCache(new UnlimitedDiscCache(StorageUtils.getCacheDirectory(this)))
.diskCacheSize(100 * 1024 * 1024)
.diskCacheFileCount(200)
.diskCacheFileNameGenerator(new HashCodeFileNameGenerator())
.imageDownloader(new BaseImageDownloader(this))
.imageDecoder(new BaseImageDecoder(false))
.defaultDisplayImageOptions(DisplayImageOptions.createSimple())
.build();
ImageLoader.getInstance().init(config);
options = new DisplayImageOptions.Builder()
.showImageOnLoading(R.drawable.ic_stub)
.showImageForEmptyUri(R.drawable.ic_empty)
.showImageOnFail(R.drawable.ic_error)
.cacheInMemory(true)
.cacheOnDisk(true)
.considerExifParams(true)
.displayer(new RoundedBitmapDisplayer(20))
.build();
asyncTask = new AsyncTask<Void, Void, Void>() {
protected Void doInBackground(Void... params) {
StyleFeedServerUtils serverUtils = new StyleFeedServerUtils();
feedList = serverUtils.getStyleFeedList(MainActivity.this);
return null;
}
@Override
protected void onPostExecute(Void result) {
if(feedList != null && feedList.size() > 0){
ListView listView = (ListView)findViewById(R.id.list);
listView.setAdapter(new ImageAdapter());
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Log.e("fashion", "onItemClick, position : "+position);
}
});
}
asyncTask.cancel(!isCancelled());
asyncTask = null;
}
};
asyncTask.execute(null, null, null);
}
@Override
public void onDestroy() {
if (registerTask != null) {
registerTask.cancel(true);
}
GCMRegistrar.onDestroy(this);
AnimateFirstDisplayListener.displayedImages.clear();
super.onDestroy();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
class ImageAdapter extends BaseAdapter {
private LayoutInflater inflater;
private ImageLoadingListener animateFirstListener = new AnimateFirstDisplayListener();
ImageAdapter() {
inflater = LayoutInflater.from(MainActivity.this);
}
@Override
public int getCount() {
return feedList.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
Log.e("fashion", "getView, position : "+position);
View view = convertView;
if (convertView == null) {
view = inflater.inflate(R.layout.style_feed_list_view, parent, false);
}
ImageView imageView = (ImageView)view.findViewById(R.id.style_feed_image);
ImageLoader.getInstance().displayImage(feedList.get(position).get("URL").toString(), imageView, options, animateFirstListener);
return view;
}
}
private static class AnimateFirstDisplayListener extends SimpleImageLoadingListener {
static final List<String> displayedImages = Collections.synchronizedList(new LinkedList<String>());
@Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
if (loadedImage != null) {
ImageView imageView = (ImageView) view;
boolean firstDisplay = !displayedImages.contains(imageUri);
if (firstDisplay) {
FadeInBitmapDisplayer.animate(imageView, 500);
displayedImages.add(imageUri);
}
}
}
}
}
feedList有3个项目。因此，ArrayList<HashMap<String, Object >>应该被调用3次，但被调用24次。
我认为日志应该是这样的，
getView()但是，我得到了这样的日志：
02-11 12:55:32.059: E/fashion(6829): getView, position : 0
02-11 12:55:32.084: E/fashion(6829): getView, position : 1
02-11 12:55:32.184: E/fashion(6829): getView, position : 2
答案 0 :(得分：1)
getview（）调用与使用AIUL无关。
我建议您这样喜欢这个。
前
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ListView
android:id="@+id/list_listview"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</ListView>
</LinearLayout>
后
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ListView
android:id="@+id/list_listview"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</ListView>
</LinearLayout>