我想將我的代碼從使用遊標轉換爲使用CursorLoaders。爲了支持舊版本的Android,我安裝了支持庫,而不是導入android.content.CursorLoader,我導入了android.support.v4.content.CursorLoader。現在編譯好的代碼會拋出兩個錯誤。第一個錯誤是在我執行LoaderManager時出現的。錯誤是:LoaderManager無法解析爲類型。第二個錯誤是對initLoader的調用。錯誤是:類型LoaderManager中的方法initLoader(int,Bundle,LoaderManager.LoaderCallbacks)不適用於參數(int,Bundle,MyList)。這裏是我的代碼:使用支持庫時LoaderManager上的錯誤
public class MyList extends ListActivity implements LoaderManager.LoaderCallbacks<Cursor> {
private static final String[] PROJECTION = new String[] { "_id", "fieldname" };
private static final int LOADER_ID = 0;
private static final String MYTABLE_BASEPATH = "MyTable_tbl";
private static final String AUTHORITY = "SQLData";
public static final Uri MY_URI = Uri.parse("content://" + AUTHORITY + "/" + MYTABLE_BASEPATH);
private SimpleCursorAdapter mAdapter;
@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent myData = getIntent();
Bundle info = myData.getExtras();
if (info != null){
Cursor c;
String[] dataColumns = { "fieldname" };
int[] viewIDs = { R.id.mylist1 };
SimpleCursorAdapter adapter;
adapter = new SimpleCursorAdapter(this, R.layout.mylist, null, dataColumns, viewIDs, CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
setListAdapter(adapter);
getLoaderManager().initLoader(0, info, this);
}
}
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
String selection = "level = '" + args.getString("Level") + "'";
return new CursorLoader(this, MY_URI,
PROJECTION, selection, null, null);
}
public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
switch (loader.getId()) {
case LOADER_ID:
mAdapter.swapCursor(cursor);
break;
}
}
public void onLoaderReset(Loader<Cursor> loader) {
mAdapter.swapCursor(null);
}
}
我部分地通過導入android.support.v4.app.LoaderManager解決了這個。但是我仍然在initLoader調用中收到相同的錯誤消息。 – Melanie