クラスメソッド

Question

からの進捗状況ダイアログを主なアクティビティで表示する私のサーバからデータをダウンロードするメソッドでクラスを初期化しました。

私はダウンロードまでProgress Dialogを表示したいと思います。しかし、Progress Dialogは表示されません。

私の主な活動：

public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener{ 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
     ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); 
     drawer.setDrawerListener(toggle); 
     toggle.syncState(); 

     NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); 
     navigationView.setNavigationItemSelectedListener(this); 

     setFragmentManager(new MainActivityFragment()); 

     Updater updater = new Updater(this,(ViewGroup) findViewById(R.id.fragment)); 
     updater.check(); 
    } 

    public void setFragmentManager(Fragment fragment){ 
     FragmentManager fragmentManager = getSupportFragmentManager(); 
     FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
     fragmentTransaction.replace(R.id.fragment, fragment); 
     fragmentTransaction.addToBackStack(null); 
     fragmentTransaction.commit(); 
    } 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.menu_main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 

     switch (id){ 
      case R.id.action_settings: 
       return true; 
      case R.id.medi_calc_item: 
       setFragmentManager(new MediCalcFragment()); 
      default: 
       return super.onOptionsItemSelected(item); 
     } 
    } 

    @SuppressWarnings("StatementWithEmptyBody") 
    @Override 
    public boolean onNavigationItemSelected(MenuItem item) { 
     // Handle navigation view item clicks here. 
     int id = item.getItemId(); 
     switch (id){ 
      case R.id.nav_start: 
       setFragmentManager(new MainActivityFragment()); 
       break; 
      case R.id.nav_medis: 
       setFragmentManager(new MediAbcFragment()); 
       break; 
      case R.id.nav_bos: 
       setFragmentManager(new BosAbcFragment()); 
       break; 
      default: 
       break; 
     } 

     DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
     drawer.closeDrawer(GravityCompat.START); 
     return true; 
    } 

    @Override 
    public void onBackPressed() { 
     DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
     if (drawer.isDrawerOpen(GravityCompat.START)) { 
      drawer.closeDrawer(GravityCompat.START); 
     } else { 
      super.onBackPressed(); 
     } 
    } 
} 

私のクラス：

public class Updater { 
    private Context context; 
    private ViewGroup viewGroup; 
    private VersionsDAO versionsDAO; 
    private MediDAO mediDAO; 
    private RegioDAO regioDAO; 
    private HashMap<String,Integer> onlineVersions; 
    private HashMap<String,Integer> versions; 
    private ProgressDialog progressDialog; 

    public Updater(Context context, ViewGroup viewGroup) { 
     this.context = context; 
     this.versionsDAO = new VersionsDAO(context); 
     this.mediDAO = new MediDAO(context); 
     this.viewGroup = viewGroup; 
     this.onlineVersions = new HashMap<>(); 
     this.regioDAO = new RegioDAO(context); 
     this.progressDialog = new ProgressDialog(context); 
    } 

    public void check(){ 
progressDialog.setMessage(context.getString(R.string.update_cities)); 
      progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER); 
      progressDialog.setIndeterminate(true); 
      progressDialog.show(); 
      RequestQueue queue = Volley.newRequestQueue(this.context); 
      String url ="http://resper.de/resperApi.php?cmd=deStadt"; 
      StringRequest stringRequest = new StringRequest(Request.Method.GET, url, 
        new Response.Listener<String>() { 
         @Override 
         public void onResponse(String response) { 
          try { 
           JSONArray jArray = new JSONArray(response); 
           for(int i = 0; i < jArray.length(); i++){ 
            JSONObject jObject = jArray.getJSONObject(i); 
            regioDAO.insertDeStadt(jObject.getInt("id"), jObject.getString("name"), jObject.getInt("bl"), jObject.getInt("rb"), jObject.getInt("kreis"), jObject.getInt("lk")); 
           } 
           versionsDAO.updateVersion("deStadt", onlineVersions.get("deStadt")); 
           progressDialog.cancel(); 

          }catch (JSONException e) { 
           e.printStackTrace(); 
          } 
         } 
        }, new Response.ErrorListener() { 
       @Override 
       public void onErrorResponse(VolleyError error) { 
        serverNotAvailable(); 
       } 
      }); 
      queue.add(stringRequest); 
      progressDialog.cancel(); 
    } 
} 

Answer 1

は、最後の行からprogressDialog.cancel();を削除します。それはqueue.add(stringRequest);の後にあり、もう一度試してください。