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我有一個用於列表視圖的自定義適配器。它有3個字段:縮略圖和兩個文本字段。Android ListView:僅在滾動時加載項目
佈局膨脹後,縮略圖將從外部服務器下載。
如何更改功能,以便僅在用戶向下滾動時下載圖像。
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Inflate the layout
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.list_single, parent, false);
ImageView image = (ImageView) rowView.findViewById(R.id.picture);
TextView firstline = (TextView) rowView.findViewById(R.id.firstline);
TextView secondline = (TextView) rowView.findViewById(R.id.secondline);
// Get information about the report
AnimalLocationLog current = objects.get(position);
// Get all the important information
String species = current.getSpecies();
String sanitizedSpecies = MiscHelpers.sanitizeString(species);
int reportId = objects.get(position).getTrackerId();
// Construct the URL to the image
String imageLocation = websiteUrl + sanitizedSpecies + separator + reportId + extension;
// Display user report
downloader.download(imageLocation, image);
firstline.setText(species);
secondline.setText("Spotted " + current.getDateTime().toString("yyyy-MM-dd H:m"));
return rowView;
}
此代碼看起來像它會做你已經需要的東西。 –
@AdamS是正確的只有在列表視圖需要屏幕上的視圖時調用getView。 – Decoy
謝謝@AdamS - 請發表一個答案,我會接受它 – chuckfinley