我正在尝试自定义 ParseQueryAdapter 并实现缓存。我尝试在适配器的 onLoaded 方法中缓存结果,但问题是,在 Logcat 中看到的 onLoading 和 onLoaded 都没有被调用。当试图在实际的 Activity 中直接实现这两个方法时,它们会被调用,但在这个单独的适配器类中实现它们时不会。
这是我的代码:
public class SongbookAdapter extends ParseQueryAdapter<Song> implements ParseQueryAdapter.OnQueryLoadListener<Song> {
private static String USERNAME = "username";
private static String PIN_LABEL_SONGS = "songs";
public Context context;
public SongbookAdapter(final Context context, final ParseUser organizer) {
super(context, new ParseQueryAdapter.QueryFactory<Song>() {
public ParseQuery<Song> create() {
ParseQuery<Song> query = ParseQuery.getQuery(Song.class);
query.whereEqualTo(USERNAME, organizer.get(USERNAME));
// If internet is down, we query from the cache in the local datastore
if(!Methods.isOnline(context)) {
query.fromPin(PIN_LABEL_SONGS);
}
return query;
}
});
this.context = context;
Log.i("SongbookAdapter", "SongbookAdapter was created");
}
@Override
public View getItemView(Song song, View v, ViewGroup parent) {
...
}
@Override
public void onLoading() {
Log.i("SongbookAdapter", "OnLoading was called");
}
@Override
public void onLoaded(final List<Song> songs, Exception e) {
Log.i("SongbookAdapter", "OnLoaded was called");
if(e == null) {
Log.i("SongbookAdapter", "Loading songs in adapter was successful");
// If we have internet connection, we cache the results in the local datastore
if(Methods.isOnline(context)) {
cacheResults(songs);
}
} else {
// Something went wrong
Log.e("SongbookAdapter", "Loading songs in adapter failed");
e.printStackTrace();
}
}
日志猫:
W/KeyCharacterMap﹕ No keyboard for id -1
W/KeyCharacterMap﹕ Using default keymap: /system/usr/keychars/qwerty.kcm.bin
D/SongbookAdapter﹕ SongbookAdapter was created
D/dalvikvm﹕ GC_FOR_MALLOC freed 1074K, 47% free 4858K/9095K, external 3496K/4366K, paused 20ms
I/dalvikvm-heap﹕ Grow heap (frag case) to 11.465MB for 844153-byte allocation
D/dalvikvm﹕ GC_FOR_MALLOC freed <1K, 43% free 5682K/9927K, external 3496K/4366K, paused 60ms
D/dalvikvm﹕ GC_FOR_MALLOC freed 1491K, 48% free 5166K/9927K, external 3119K/3895K, paused 15ms
D/dalvikvm﹕ GC_FOR_MALLOC freed 515K, 43% free 5675K/9927K, external 3119K/3895K, paused 16ms
I/dalvikvm-heap﹕ Grow heap (frag case) to 11.895MB for 844153-byte allocation
D/dalvikvm﹕ GC_FOR_MALLOC freed 0K, 40% free 6500K/10759K, external 3119K/3895K, paused 15ms
D/dalvikvm﹕ GC_EXTERNAL_ALLOC freed 1017K, 50% free 5483K/10759K, external 3119K/3895K, paused 22ms
D/szipinf﹕ Initializing inflate state
我错过了什么吗?为什么根本不调用 onLoading 和 onLoaded ?
感谢任何帮助!