リストビューには1つのアイテムしか表示されません

Question

私はAndroidをListViewにしてFirebaseデータベースのオブジェクトを表示していますが、アイテムを追加していますが、ListViewには1アイテムしか表示されていません。私はArrayAdapterを使用しています、すべてのコードは以下のとおりです。最初の項目は、最大表示される代わりに、すべてのデータが

サンプルJSONファイルを提供するだけここにある：

{ 
    "items" : { 
    "item0" : { 
     "description" : "its an apple", 
     "name" : "apples", 
     "price" : 10, 
     "productID" : 0, 
     "quantity" : 5, 
     "type" : "fruit" 
    }, 
    "item1" : { 
     "description" : "its an orange", 
     "name" : "oranges", 
     "price" : 10, 
     "productID" : 1, 
     "quantity" : 15, 
     "type" : "fruit" 
     }, 
     "item2" : { 
     "description" : "bagle", 
     "name" : "bagles", 
     "price" : 9, 
     "productID" : 2, 
     "quantity" : 7, 
     "type" : "food" 
     } 
    }, 

    "users" : { 
    "dummy" : "keep this entry. without this, the other entries won't appear on the database" 
    } 
} 

http://paste.ubuntu.com/25916653/

activity_main_app_page.xml

<android.support.design.widget.CoordinatorLayout  
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/main_content" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:fitsSystemWindows="true" 
    tools:context="com.ub.akshay.nitkart.MainAppPage"> 

    <android.support.design.widget.AppBarLayout 
     android:id="@+id/appbar" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:paddingTop="@dimen/appbar_padding_top" 
     android:theme="@style/AppTheme.AppBarOverlay"> 

     <android.support.v7.widget.Toolbar 
      android:id="@+id/toolbar" 
      android:layout_width="match_parent" 
      android:layout_height="?attr/actionBarSize" 
      android:background="?attr/colorPrimary" 
      app:layout_scrollFlags="scroll|enterAlways" 
      app:popupTheme="@style/AppTheme.PopupOverlay"> 

     </android.support.v7.widget.Toolbar> 

    </android.support.design.widget.AppBarLayout> 

    <ListView 
     android:id="@+id/shoppingList" 
     android:orientation="vertical" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:paddingTop="8dp" 
     android:paddingBottom="120dp" 
     android:clipToPadding="false" 
     app:layout_behavior="@string/appbar_scrolling_view_behavior" 
     android:scrollbarStyle="outsideOverlay" /> 

    <ProgressBar 
     android:id="@+id/mainPageProgressBar" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_gravity="center" /> 

    <android.support.design.widget.FloatingActionButton 
     android:id="@+id/cartMainPage" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_gravity="end|bottom" 
     android:layout_margin="@dimen/fab_margin" 
     app:backgroundTint="@android:color/background_light" 
     app:srcCompat="@drawable/ic_shopping_cart_black_24dp" /> 


</android.support.design.widget.CoordinatorLayout>` 

MainActivity。 java

shoppingItemsリストのサイズと同じ

package com.ub.tom.smith; 

import android.content.Intent; 
import android.os.Bundle; 
import android.os.Handler; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.util.Log; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ListView; 
import android.widget.ProgressBar; 

import com.google.firebase.auth.FirebaseAuth; 
import com.google.firebase.database.DataSnapshot; 
import com.google.firebase.database.DatabaseError; 
import com.google.firebase.database.DatabaseReference; 
import com.google.firebase.database.FirebaseDatabase; 
import com.google.firebase.database.ValueEventListener; 

import java.util.ArrayList; 

public class MainAppPage extends AppCompatActivity { 

    public final String TAG = MainAppPage.class.getSimpleName(); 
    ListView shoppingItemView; 
    ShoppingListAdapter adapter; 
    ProgressBar progressBar; 
    FirebaseDatabase database = FirebaseDatabase.getInstance(); 
    DatabaseReference myRef = database.getReference("items"); 
    private Boolean exit = false; 
    private ArrayList<ShoppingItem> shoppingItems; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 

     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main_app_page); 

     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     toolbar.setTitle("NITKart"); 
     setSupportActionBar(toolbar); 

     FloatingActionButton shoppingCart = (FloatingActionButton)  
     findViewById(R.id.cartMainPage); 
     shoppingCart.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       startActivity(new Intent(getApplicationContext(), 
       ShoppingCartWindow.class)); 
      } 
     }); 

     progressBar = (ProgressBar) 
     findViewById(R.id.mainPageProgressBar); 
     shoppingItemView = (ListView) findViewById(R.id.shoppingList); 

     myRef.addValueEventListener(new ValueEventListener() { 
      // This listener is only for database with reference of key 
      "items" 
      @Override 
      public void onDataChange(DataSnapshot dataSnapshot) { 
       // This method is called once with the initial value and   
       again 
       // whenever data at this location is updated. 

       // Now the Shopping List gets updated whenever the data 
       shoppingItems = getAllItems(dataSnapshot); 
       adapter = new ShoppingListAdapter(getApplicationContext(), 
       shoppingItems); 
       progressBar.setVisibility(View.GONE); 
       shoppingItemView.setAdapter(adapter); 
      } 

      @Override 
      public void onCancelled(DatabaseError error) { 
       // Failed to read value 
       Log.w(TAG, "Failed to read value.", error.toException()); 
      } 
     }); 

     shoppingItemView.setOnItemClickListener(new 
     AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> adapterView, View view, 
      int i, long l) { 
       Intent productIntent = new Intent(MainAppPage.this, 
       IndividualProduct.class); 
       productIntent.putExtra("product", shoppingItems.get(i)); 
       startActivity(productIntent); 
      } 
     }); 

    } 


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

     //noinspection SimplifiableIfStatement 
     if (id == R.id.logoutItem) { 
      FirebaseAuth.getInstance().signOut(); 
      startActivity(new Intent(getApplicationContext(), 
      OpenScreen.class)); 
      finish(); 
     } 

     return super.onOptionsItemSelected(item); 
    } 

    // For exiting the application 
    @Override 
    public void onBackPressed() { 
     if (exit) { 
      finish(); 
     } else { 
      Snackbar.make(findViewById(R.id.main_content), "Press back 
      again to exit", Snackbar.LENGTH_SHORT).show(); 
      exit = true; 
      new Handler().postDelayed(new Runnable() { 
       @Override 
       public void run() { 
        exit = false; 
       } 
      }, 2000); 
     } 
    } 

    public static ArrayList<ShoppingItem> getAllItems(DataSnapshot 
    dataSnapshot){ 

     ArrayList<ShoppingItem> items = new ArrayList<ShoppingItem>(); 

     for (DataSnapshot item : dataSnapshot.getChildren()) { 

      items.add(new ShoppingItem(

      Integer.valueOf(item.child("productID").getValue().toString()), 
        item.child("name").getValue().toString(), 
        item.child("type").getValue().toString(), 
        item.child("description").getValue().toString(), 

      Integer.valueOf(item.child("price").getValue().toString()), 

      Integer.valueOf(item.child("quantity").getValue().toString()) 
      )); 

     } 

     return items; 
    } 

} 

Answer 1

あなたがShoppingListAdapterのsetSizeを（確認することができます）

Answer 2

あなたonDataChange()メソッド内runOnUiThreadを追加してみてください。新しいRunnableの中にはアダプタコードが含まれています。