如何將數據從片段發送到活動

我正在創建一個實現可滾動選項卡的應用程序。每個選項卡都有一個列表視圖，其中的項目是從Internet下載的。如何將數據從片段發送到活動

我活動，我有ViewPager我想使用搜索框來搜索列表中的所有項目。

但我不知道如何將數據從列表發送到活動。

我的代碼：

public class Coffees extends Fragment{ 
    private View rootView; 
    private ListView lv; 
    private ArrayAdapter<ProductList> adapter; 
    private String jsonResult, table; 
    private String url = "http://my.chatapp.info/order_api/files/getkafedes.php", name, image, price; 

    ProgressDialog pDialog; 
    List<ProductList> customList; 
    private static final String TABLE_INTENT_ID = "table_name"; 
    private static final String COMPANY_INTENT_ID = "magaziID"; 
    private static final String WAITER_INTENT_ID = "servitorosID"; 
    private TextView tv1, tv2; 
    int pos; 
    private CardView cardView; 
    private String servitoros_id; 
    private String magazi_id; 
    private Communicator communicator; 

    @Override 
    public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState) { 

     rootView = inflater.inflate(R.layout.coffees_fragment, container, false); 
     lv = (ListView)rootView.findViewById(R.id.coffeesListView); 
     cardView = (CardView)rootView.findViewById(R.id.card_view); 
     table = getActivity().getIntent().getStringExtra(TABLE_INTENT_ID); 
     servitoros_id = getActivity().getIntent().getStringExtra(WAITER_INTENT_ID); 
     magazi_id = getActivity().getIntent().getStringExtra(COMPANY_INTENT_ID); 
     final SwipeRefreshLayout mSwipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.activity_main_swipe_refresh_layout); 
     ConnectivityManager cm = (ConnectivityManager) getActivity().getSystemService(getActivity().getApplicationContext().CONNECTIVITY_SERVICE); 
     NetworkInfo activeNetwork = cm.getActiveNetworkInfo(); 
     boolean network_connected = activeNetwork != null && activeNetwork.isAvailable() && activeNetwork.isConnectedOrConnecting(); 

     if (!network_connected) { 
      onDetectNetworkState().show(); 
     } else { 
      if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI || activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) { 
       accessWebService(); 
       pDialog.dismiss(); 
       setRetainInstance(true); 
       registerCallClickBack(); 

       mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { 
        @Override 
        public void onRefresh() { 
         accessWebService(); 
         mSwipeRefreshLayout.setRefreshing(false); 
        } 
       }); 
      } 
     } 
     return rootView; 
    } 

    private void registerCallClickBack() { 

     lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
       //pos = position; 
       Intent intent = new Intent(getActivity(), CoffeesLayoutActivity.class); 
       intent.putExtra("coffeeName", customList.get(position).getName()); 
       intent.putExtra("coffeePrice", customList.get(position).getPrice()); 
       intent.putExtra("coffeeImage", customList.get(position).getImage()); 
       intent.putExtra(TABLE_INTENT_ID, table); 
       intent.putExtra(WAITER_INTENT_ID, servitoros_id); 
       intent.putExtra(COMPANY_INTENT_ID, magazi_id); 
       startActivity(intent); 
      } 
     }); 
    } 


    public class JsonReadTask extends AsyncTask<String , Void, List<ProductList>> { 
     public JsonReadTask() { 
      super(); 
     } 

     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
      pDialog = new ProgressDialog(getActivity()); 
      pDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER); 
      pDialog.setIndeterminate(true); 
      pDialog.setMessage(getString(R.string.get_stocks)); 
      pDialog.setCancelable(false); 
      pDialog.setInverseBackgroundForced(true); 
      pDialog.show(); 
     } 

     @Override 
     protected List<ProductList> doInBackground(String... params) { 
      HttpClient httpclient = new DefaultHttpClient(); 
      HttpPost httppost = new HttpPost(params[0]); 
      try { 
       HttpResponse response = httpclient.execute(httppost); 
       jsonResult = inputStreamToString(
         response.getEntity().getContent()).toString(); 
       customList = new ArrayList<>(); 

       JSONObject jsonResponse = new JSONObject(jsonResult); 
       JSONArray jsonMainNode = jsonResponse.optJSONArray("kafedes"); 
       for (int i = 0; i < jsonMainNode.length(); i++) { 
        JSONObject jsonChildNode = jsonMainNode.getJSONObject(i); 
        name = jsonChildNode.optString("name"); 
        price = jsonChildNode.optString("price"); 
        image = jsonChildNode.optString("image"); 
        customList.add(new ProductList(image, name, price)); 

       } 
       return customList; 
      } catch (Exception e) { 
       e.printStackTrace(); 
       getActivity().finish(); 
      } 
      return null; 
     } 

     private StringBuilder inputStreamToString(InputStream is) { 
      String rLine = ""; 
      StringBuilder answer = new StringBuilder(); 
      BufferedReader rd = new BufferedReader(new InputStreamReader(is)); 
      try { 
       while ((rLine = rd.readLine()) != null) { 
        answer.append(rLine); 
       } 
      } catch (Exception e) { 
       getActivity().finish(); 
      } 
      return answer; 
     } 

     @Override 
     protected void onPostExecute(List<ProductList> customList) { 
      if(customList == null){ 
       Log.d("ERORR", "No result to show."); 
       return; 
      } 
      ListDrawer(customList); 
      pDialog.dismiss(); 
     } 
    }// end async task 

    public void accessWebService() { 
     JsonReadTask task = new JsonReadTask(); 
     task.execute(url); 
    } 

    public void ListDrawer(List<ProductList> customList) { 
     adapter = new ProductListAdapter(getActivity().getApplicationContext(), R.layout.productlist_row_item, customList); 
     adapter.notifyDataSetChanged(); 
     lv.setAdapter(adapter); 
    }

我已經創建了一個接口，如：

public interface Communicator { 
    void responseList(String name, String image, String price); 
}

內部片段

的onActivityCreated方法

@Override 
    public void onActivityCreated(Bundle savedInstanceState) { 
     super.onActivityCreated(savedInstanceState); 
     communicator = (Communicator)getActivity(); 
     communicator.responseList(name, image, price); 
    }

的活動：

public class ProductsViewOrder extends AppCompatActivity implements Communicator { 

    private ViewPager viewPager; 
    private ProductsTabPagerAdapter mAdapter; 
    private PagerSlidingTabStrip tabs; 
    private SearchBox box; 
    private String title; 
    private SearchResult option; 
    private Intent intent; 
    private ConnectivityManager cm; 
    private NetworkInfo activeNetwork; 
    boolean network_connected; 
    private String servitoros_id; 
    private String magazi_id; 
    private static final String COMPANY_INTENT_ID = "magaziID"; 
    private static final String WAITER_INTENT_ID = "servitorosID"; 
    private static final String TABLE_INTENT_ID = "table_name"; 
    private Toolbar toolbar; 
    private float mActionBarHeight; 
    private String name, image, price; 

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

    private void checkNetwork() { 
     cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); 
     activeNetwork = cm.getActiveNetworkInfo(); 
     network_connected = activeNetwork != null && activeNetwork.isAvailable() && activeNetwork.isConnectedOrConnecting(); 
     if (!network_connected) { 
      DialogMessageDisplay.displayWifiSettingsDialog(ProductsViewOrder.this, ProductsViewOrder.this, getString(R.string.wifi_off_title), getString(R.string.wifi_off_message)); 
     } else { 
      setupPages(); 
      setupSearch(); 
     } 
    } 

    private void setupSearch() { 
     box = (SearchBox) findViewById(R.id.searchbox); 
     box.setLogoText(getString(R.string.search)); 

    } 

    private void setupPages() { 
     toolbar = (Toolbar) findViewById(R.id.toolBar); 
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { 
      toolbar.setElevation(0); 
     } 
     viewPager = (ViewPager) findViewById(R.id.pager); 
     intent = getIntent(); 
     servitoros_id = intent.getStringExtra(WAITER_INTENT_ID); 
     magazi_id = intent.getStringExtra(COMPANY_INTENT_ID); 
     title = intent.getStringExtra(TABLE_INTENT_ID); 
     toolbar.setTitle(getString(R.string.table_id) + title); 
     mAdapter = new ProductsTabPagerAdapter(getSupportFragmentManager(), ProductsViewOrder.this, ProductsViewOrder.this); 
     viewPager.setAdapter(mAdapter); 
     tabs = (PagerSlidingTabStrip) findViewById(R.id.tabs); 
     tabs.setViewPager(viewPager); 
     tabs.setDividerColor(Color.TRANSPARENT); 
     tabs.setIndicatorColor(Color.WHITE); 
     tabs.setIndicatorHeight(6); 
     setSupportActionBar(toolbar); 
     toolbar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() { 
      @Override 
      public boolean onMenuItemClick(MenuItem item) { 
       int id = item.getItemId(); 
       switch (id) { 
        case R.id.search: { 
         showSearchResults(); 
         break; 
        } 
        case R.id.cart: { 
         showCart(); 
         break; 
        } 
       } 

       return true; 
      } 
     }); 
    } 

    private void showCart() { 
     Toast.makeText(ProductsViewOrder.this, R.string.cart_empty_toast, Toast.LENGTH_SHORT).show(); 
    } 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     getMenuInflater().inflate(R.menu.menu_new_order, menu); 
     return true; 
    } 

    private void showSearchResults() { 
     box.revealFromMenuItem(R.id.search, this); 
     box.setSearchListener(new SearchBox.SearchListener() { 
      @Override 
      public void onSearchOpened() { 

      } 

      @Override 
      public void onSearchCleared() { 
      } 

      @Override 
      public void onSearchClosed() { 
       closeSearch(); 
      } 

      @Override 
      public void onSearchTermChanged() { 
      } 

      @Override 
      public void onSearch(String searchTerm) { 
       //Toast.makeText(ProductsViewOrder.this, searchTerm + " Searched", Toast.LENGTH_LONG).show(); 
      } 
     }); 
    } 

    protected void closeSearch() { 
     box.hideCircularly(this); 
    } 

    @Override 
    public void onBackPressed() { 
     super.onBackPressed(); 
     overridePendingTransition(R.anim.slide_out_left, R.anim.slide_in_left); 
    } 


    @Override 
    public void responseList(String name, String image, String price) { 
     this.name = name; 
     this.image = image; 
     this.price = price; 
    } 
}

而且我仍然得到空數據。任何建議將不勝感激。

來源

2015-10-26 ElouCapitan