太方便了:
AsyncQueryHandler handler =
new AsyncQueryHandler(mActivity.getContentResolver()) {};
handler.startUpdate(-1, null, sessionUri, values, null, null);
当您需要异步执行CRUD操作而不使用Loader时,继承自AsyncQueryHandler非常有用,因此您可以获得诸如startQuery、startInsert、startUpdate和startDelete等方法。一个简单的实现可以是:
public class CustomAsyncHandler extends AsyncQueryHandler {
private WeakReference<AsyncQueryListener> mListener;
public interface AsyncQueryListener {
void onQueryComplete(int token, Object cookie, Cursor cursor);
}
public CustomAsyncHandler(ContentResolver cr, AsyncQueryListener listener) {
super(cr);
mListener = new WeakReference<AsyncQueryListener>(listener);
}
public CustomAsyncHandler(ContentResolver cr) {
super(cr);
}
/**
* Assign the given {@link AsyncQueryListener} to receive query events from
* asynchronous calls. Will replace any existing listener.
*/
public void setQueryListener(AsyncQueryListener listener) {
mListener = new WeakReference<AsyncQueryListener>(listener);
}
/** {@inheritDoc} */
@Override
protected void onQueryComplete(int token, Object cookie, Cursor cursor) {
final AsyncQueryListener listener = mListener.get();
if (listener != null) {
listener.onQueryComplete(token, cookie, cursor);
} else if (cursor != null) {
cursor.close();
}
}
}
正如您所看到的,额外的接口AsyncQueryListener被创建为在查询完成时作为回调使用,因此您可以创建 AsyncUpdateListener,AsyncDeleteListener,AsyncInsertListener等等。
AsyncQueryHandler asyncQueryHandler = new AsyncQueryHandler(activity.getContentResolver()){
@Override
protected void onInsertComplete(int token, Object cookie, Uri uri) {
super.onInsertComplete(token, cookie, uri);
Log.d(TAG, "onInsertComplete return uri: " + uri);
}
};
asyncQueryHandler.startInsert(-1, null, mUri, values);