Android之LoaderManager与CursorAdapter的使用

初始化

LoaderManager = loaderManager = getActivity().getSupportLoaderManager();
loaderManager.initLoader(0, null, new ContactsFragment.ContactsCallBack());

调用MySessionCallback这个内部类

private class MySessionCallback implements LoaderManager.LoaderCallbacks<Cursor> {
        @Override
        public Loader<Cursor> onCreateLoader(int id, Bundle args) {
            if (id == ID) {
                return new CursorLoader(getActivity(), SmsProvider.SESSION_URI, null, "from_account=? or to_account=? group by session_account", new String[]{IMService.CURRENT_ACCOUNT, IMService.CURRENT_ACCOUNT}, "time asc");
            } else {
                return null;
            }
        }

        @Override
        public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
            if (adapter != null) {
                adapter.getCursor().requery();
                return;
            }
            Log.i(TAG, "onLoadFinished: ");
            adapter = new SessionAdapter(getActivity(), data, CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
            mListView.setAdapter(adapter);
        }

        @Override
        public void onLoaderReset(Loader<Cursor> loader) {

        }
    }

调用CursorAdapter的类实现其中的方法来显示数据：

private class SessionAdapter extends CursorAdapter {
        public SessionAdapter(Context context, Cursor c, int flags) {
            super(context, c, flags);
        }

        @Override
        public View newView(Context context, Cursor cursor, ViewGroup parent) {
            return View.inflate(context, R.layout.item_session, null);

        }

        @Override
        public void bindView(View view, Context context, Cursor cursor) {
            ImageView ivHead = (ImageView) view.findViewById(R.id.head);
            TextView tvBody = (TextView) view.findViewById(R.id.body);
            TextView tvNickName = (TextView) view.findViewById(R.id.nickname);

            String body = cursor.getString(cursor.getColumnIndex(SmsHelper.SmsTable.BODY));
            String acccount = cursor.getString(cursor.getColumnIndex(SmsHelper.SmsTable.SESSION_ACCOUNT));

            tvBody.setText(body);
            tvNickName.setText(acccount);
        }
    }