Parse.com显示加载时的进度对话框

Question

我正在使用Parse.com，我正试图在数据加载到gridview时显示进度。看看下面我的尝试。进度条永远不会出现。它只显示一个白色屏幕，然后开始显示gridview项目。

rListActivity.java

public class rListActivity extends Activity {
    pAdapter padapter;
    GridView gridview;
    ProgressDialog mProgressDialog;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.listview_main);
        gridview = (GridView) findViewById(R.id.gridview);
        padapter = new pAdapter(this);
         padapter.loadObjects();
        padapter.addOnQueryLoadListener(new ParseQueryAdapter.OnQueryLoadListener<Meal>() {

            @Override
            public void onLoading() {
                mProgressDialog = new ProgressDialog(rListActivity.this);
                mProgressDialog.setMessage("Loading...");
                mProgressDialog.setIndeterminate(false);
                mProgressDialog.show();

            }


            @Override
            public void onLoaded(List<Meal> objects, Exception e) {
                gridview.setAdapter(padapter);
                mProgressDialog.dismiss();
            }
        });


    }

pAdapter.java

    public class pAdapter extends ParseQueryAdapter<Meal> {

        public pAdapter(Context context) {
            super(context, new ParseQueryAdapter.QueryFactory<Meal>() {
                public ParseQuery<Meal> create() {

                    ParseQuery query = new ParseQuery("Meal");

                    query.orderByAscending("title");
                    return query;
                }
            });

        }
......

Itemviews....

Answer 1

我可能会迟到但答案很简单。

您需要在

之后致电padapter.loadObjects();

padapter.addOnQueryLoadListener(new ParseQueryAdapter.OnQueryLoadListener<Meal>() {

        @Override
        public void onLoading() {
            mProgressDialog = new ProgressDialog(rListActivity.this);
            mProgressDialog.setMessage("Loading...");
            mProgressDialog.setIndeterminate(false);
            mProgressDialog.show();

        }


        @Override
        public void onLoaded(List<Meal> objects, Exception e) {
            gridview.setAdapter(padapter);
            mProgressDialog.dismiss();
        }
    });