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这可能是一个简单的问题，但我已经浪费了几个小时。我希望在从 Backendless 加载数据后，在加载整个列表的不同时间之后，“需要加载更多”功能无法访问进度对话框。

这是我的代码

    adapter = new MainAdapter( MainActivity.this, R.layout.main_row_item, totalMains );

    setListAdapter( adapter );

    QueryOptions queryOptions = new QueryOptions();
    queryOptions.setRelated( Arrays.asList( "message" ) );

    BackendlessDataQuery query = new BackendlessDataQuery( queryOptions );

    Backendless.Data.of( Main.class ).find( query, new LoadingCallBack<BackendlessCollection<Main>>( this, getString( R.string.loading_mains ), true )
    {

        @Override
        public void handleResponse( BackendlessCollection<Main> mainsBackendlessCollection )
        {
            mains = mainsBackendlessCollection;

            addMoreItems( mainsBackendlessCollection );

            super.handleResponse( mainsBackendlessCollection );
        }
    } );

    ListView list = (ListView) findViewById( android.R.id.list );
    list.setOnScrollListener( new AbsListView.OnScrollListener()
    {
        @Override
        public void onScrollStateChanged( AbsListView view, int scrollState )
        {

            }


        @Override
        public void onScroll( AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount )
        {


            if( needToLoadItems( firstVisibleItem, visibleItemCount, totalItemCount ) )
            { progressDialog = new ProgressDialog(MainActivity.this);

progressDialog.setMessage("正在加载更多数据请稍候..."); progressDialog.setIndeterminate(false); progressDialog.setCancelable(true);progressDialog.show();

                isLoadingItems = true;
                mains.nextPage( new LoadingCallBack<BackendlessCollection<Main>>( MainActivity.this )
                {
                    @Override
                    public void handleResponse( BackendlessCollection<Main> nextPage )
                    {


                            progressDialog.dismiss();


                        mains = nextPage;
                        addMoreItems( nextPage );

                        isLoadingItems = false;
                    }
                } );
            }
        }
    } );
}


private boolean needToLoadItems( int firstVisibleItem, int visibleItemCount, int totalItemCount )
{

       return !isLoadingItems && totalItemCount != 0 && totalItemCount - (visibleItemCount + firstVisibleItem) < visibleItemCount / 2;

}

private void addMoreItems( BackendlessCollection<Main> nextPage )
{
    totalMains.addAll( nextPage.getCurrentPage() );
    adapter.notifyDataSetChanged();
}

}

我是安卓新手。。

4

1 回答 1

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也许你可以使用 ProgressBar 而不是 ProgressDialog。在此处查看我的答案 Backendless：我无法访问检索到的数据

于 2016-03-29T08:37:09.320 回答