Question

我有片段活动。当我点击片段时，它会触发一个触发AsyncTask的监听器。在转移到侦听器中的下一行代码之前，我需要Async任务结果，即我需要asyncTask是同步的。

为此，我通常使用一个对话框来有效地让用户等待asyncTask onPostExecute（）。但是我的对话框没有出现，我的代码正在经过asyncTask并进入捆绑代码，然后添加空变量，悲伤的面孔。

这是我的片段类的骨头，让我知道你是否需要其他任何东西，我意识到发布太多但是我确信它与我的类的结构有关，而且事实上我正在使用片段。 / p>

public class Login_StaggeredGrid_Fragment_Activity extends FragmentActivity
{
    private ArrayList<String[]> gameSummaryTilesData;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        final FragmentManager fm = getSupportFragmentManager();

        // Create the list fragment and add it as our sole content.
        if (fm.findFragmentById(android.R.id.content) == null) {
            final StaggeredGridFragment fragment = new StaggeredGridFragment();
            fm.beginTransaction().add(android.R.id.content, fragment).commit();
        }
    }

    private class StaggeredGridFragment extends Fragment implements AbsListView.OnScrollListener, AbsListView.OnItemClickListener
    {
                private StaggeredGridView mGridView;
                private boolean mHasRequestedMore;
                private TilesAdapter mAdapter;

                @Override
                public void onCreate(final Bundle savedInstanceState) {
                    super.onCreate(savedInstanceState);
                    setRetainInstance(true);
                }

                @Override
                public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) {
                    return inflater.inflate(R.layout.activity_sgv, container, false);
                }

                @Override
                public void onActivityCreated(final Bundle savedInstanceState) {
                    List<NameValuePair> params = new ArrayList<NameValuePair>();

                    //Encapsulate all within a post cereate from a async task or call a blocking http call
                    super.onActivityCreated(savedInstanceState);

                    mGridView = (StaggeredGridView) getView().findViewById(R.id.grid_view);

                    if (savedInstanceState == null) {
                        final LayoutInflater layoutInflater = getActivity().getLayoutInflater();
                        View header = layoutInflater.inflate(R.layout.list_item_header_footer, null);
                        mGridView.addHeaderView(header);
                    }

                    if (mAdapter == null) {
                        mAdapter = new TilesAdapter(getActivity(), R.id.summary1_value);
                    }

                    for (String[] data : loginTilesData) {
                        mAdapter.add(data); //Add each loginTilesData TileAdapter element to an mAdapter where it will be further broken down and used by the TileAdapter
                    }

                    mGridView.setAdapter(mAdapter);
                    mGridView.setOnScrollListener(this);
                    mGridView.setOnItemClickListener(this);
                }

                @Override
                public void onItemClick(AdapterView<?> adapterView, View view, int position, long id)
                {

                    try
                    {
                        // Loading Games in Background Thread
                        new GetGamesSummaryTiles().execute();
                    }
                    catch (Exception e)
                    {
                        e.printStackTrace();
                    }
                    Intent i = new Intent(Login_StaggeredGrid_Fragment_Activity.this, GamesSummary_Fragment_Activity.class);
                    i.putExtra("gamesSummaryTilesData", gameSummaryTilesData);
                    startActivity(i);
                }
            }

       /**
     * Background Async Task to get data for next activity by making HTTP Request
     * */
    // Progress Dialog
    private ProgressDialog qDialog;
    // JSON parser class
    JSONParser jParser = new JSONParser();
    String url_login ="http://XX.XX.XXX.XX/XXXX.php";
    class GetGamesSummaryTiles extends AsyncTask<String, String, String>
    {
        /**
         * Before starting background thread Show Progress Dialog
         * */
        @Override
        protected void onPreExecute()
        {
            super.onPreExecute();
            qDialog = new ProgressDialog(getBaseContext());
            qDialog.setMessage("Please wait...");
            qDialog.setIndeterminate(false);
            qDialog.setCancelable(false);
            qDialog.show();
        }

        @Override
        protected String doInBackground(String... args)
        {
            // Building Parameters
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            // getting JSON string from URL
            JSONObject jsonLogin = jParser.makeHttpRequest(url_login, "GET", params);

            pk_http pk_dbComms = new pk_http();
            try {
                gameSummaryTilesData = pk_dbComms.formatHttpResponse_SummaryTile(jsonLogin);
            } catch (JSONException e) {
                String test = e.getStackTrace().toString();
                e.printStackTrace();
            }

            return jsonLogin.toString();
        }

        /**
         * After completing background task Dismiss the progress dialog
         * **/
        protected void onPostExecute(String jsonString)
        {
            // dismiss the dialog after getting all questions
            qDialog.dismiss();
            // updating UI from Background Thread
             /*runOnUiThread(new Runnable() {
             public void run() {

              }
             });*/
        }
    }
}

Answer 1

将您的意图调用代码放入onPostExecute方法中，您的问题将得到解决

将以下代码从onItemClick（）移至onPostExceute

Intent i = new Intent(Login_StaggeredGrid_Fragment_Activity.this, GamesSummary_Fragment_Activity.class);
                i.putExtra("gamesSummaryTilesData", gameSummaryTilesData);
                startActivity(i);

Answer 2

将您的以下代码放在asyncTask的postExecute（）方法中......

   Intent i = new Intent(Login_StaggeredGrid_Fragment_Activity.this, GamesSummary_Fragment_Activity.class);
                i.putExtra("gamesSummaryTilesData", gameSummaryTilesData);
                startActivity(i);

对话框没有显示导致问题的原因，因为我需要在继续之前等待asynTask返回

2 个答案: