我不知道你是怎麼做的,但它聽起來像你可以完全使用回調來實現它。
1)創建一個像這樣的接口:
public interface OnDownloadProgressChangeListener{
public void onProgress(int progress);
}
2)添加到您的MovieData對象:
// We use an ArrayList because you could need to listen to more than one event. If you are totally sure you won't need more than one listener, just change this with one listener
private ArrayList<OnDownloadProgressChangeListener> listeners = new ArrayList<OnDownloadProgressChangeListener>();
public void addDownloadProgressChangeListener(OnDownloadProgressChangeListener listener){
listeners.add(listener);
}
public void clearDownloadProgerssChangeListeners(){
listeners.clear();
}
//Add any handlers you need for your listener array.
// ALWAYS use this method to change progress value.
public void modifyProgress(int howMuch){
progress+=howMuch;
for (OnDownloadProgressChangeListener listener : listeners)
listener.onProgress(progress);
}
3)覆蓋您的自定義適配器add方法
@Override
public void add(final MovieData item){
item.addDownloadProgressChangeListener(new OnDownloadProgressChangeListener(){
public void onProgress(final int progress){
// Add your logic here
if (progress == 100){
item.update();
}
}
});
super.add(item);
}
4)每當物品被修改時,請在您的適配器上撥打notifyDataSetChanged()
。您甚至可以將其添加到add
實現中的super.add(item)
行之後,但如果您要添加大量項目,則效率極低:先添加它們,然後通知更改。
編輯,忘記調用super.add(item)添加重寫的方法。 – razielsarafan