LIstViewアダプタがカスタムアダプタでコンテンツを表示しない

ArrayListにデータオブジェクトshopObjectを作成しました。私は彼らがいっぱいになっていることを再確認します。空ではなく、アダプタを作成しようとしました。これは初めてのことで、リストは空です。私は何が正直に間違っているのか分かりません。LIstViewアダプタがカスタムアダプタでコンテンツを表示しない

**CustomListAdapter.java** 
    public class CustomListAdapter extends ArrayAdapter<shopClass> { 
    ArrayList<shopClass> shopObjects; 
    private final int resource; 

    public CustomListAdapter(Context context, ArrayList<shopClass> PshopObjects, int resource) { 
     super(context, R.layout.list_row, PshopObjects); 
     shopObjects = PshopObjects; 
     this.resource = resource; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 

     // We need to get the best view (re-used if possible) and then 
     // retrieve its corresponding ViewHolder, which optimizes lookup efficiency 
     View view = getWorkingView(convertView); 
     ViewHolder viewHolder = getViewHolder(view); 
     shopClass shop = getItem(position); 

     if (shopObjects == null) { 
      System.out.println("it is null on CustomListarrya"); 
     } 

     // Setting the title view is straightforward 
     viewHolder.titleView.setText(shop.getName()); 
     viewHolder.subTitleView.setText(shop.getDescription()); 

//  TextView title = (TextView) alertView.findViewById(R.id.title); 
//  TextView description = (TextView) alertView.findViewById(R.id.description); 
//  LinearLayout bkgImage = (LinearLayout) alertView.findViewById(R.id.bkgImage); 
// 
//  // getting movie data for the row 
// 
//  // bkg image 
////  bkgImage.setBackground(); 
// 
//  // title 
//  title.setText(shop.getName()); 
// 
//  // description 
//  description.setText(shop.getDescription()); 
     return view; 
    } 

    private View getWorkingView(final View convertView) { 
     // The workingView is basically just the convertView re-used if possible 
     // or inflated new if not possible 
     View workingView = null; 

     if(null == convertView) { 
      final Context context = getContext(); 
      final LayoutInflater inflater = (LayoutInflater)context.getSystemService 
        (Context.LAYOUT_INFLATER_SERVICE); 

      workingView = inflater.inflate(resource, null); 
     } else { 
      workingView = convertView; 
     } 

     return workingView; 
    } 

    private ViewHolder getViewHolder(final View workingView) { 
     // The viewHolder allows us to avoid re-looking up view references 
     // Since views are recycled, these references will never change 
     final Object tag = workingView.getTag(); 
     ViewHolder viewHolder = null; 


     if(null == tag || !(tag instanceof ViewHolder)) { 
      viewHolder = new ViewHolder(); 

      viewHolder.titleView = (TextView) workingView.findViewById(R.id.title); 
      viewHolder.subTitleView = (TextView) workingView.findViewById(R.id.description); 
      //viewHolder.imageView = (ImageView) workingView.findViewById(R.id.news_entry_icon); 

      workingView.setTag(viewHolder); 

     } else { 
      viewHolder = (ViewHolder) tag; 
     } 

     return viewHolder; 
    } 

    /** 
    * ViewHolder allows us to avoid re-looking up view references 
    * Since views are recycled, these references will never change 
    */ 
    private static class ViewHolder { 
     public TextView titleView; 
     public TextView subTitleView; 
     //public ImageView imageView; 
    } 

}

ShopActivity.java

public class ShopActivity extends AppCompatActivity { 
    ListView shopList; 
    CustomListAdapter adapter; 
    private ArrayList<shopClass> shopObjects; 

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

     shopList = (ListView) findViewById(R.id.list); 
     ShopData start = new ShopData(); 

     shopObjects = start.getShopData(); 
     adapter = new CustomListAdapter(this, shopObjects, R.layout.list_row); 
     for (int i = 0; i<2; i++){ 
      System.out.println(shopObjects.get(i).toString()); 
      adapter.add(shopObjects.get(i)); 
     } 
     shopList.setAdapter(adapter); 


    }

Activity_shop.xml

<LinearLayout 
    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:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior" 
    tools:context="com.csthack.beinnovative.destination_brooklyn.ShopActivity" 
    tools:showIn="@layout/activity_shop"> 

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     android:orientation="vertical" 
     android:layout_width="fill_parent" 
     android:layout_height="match_parent"> 

    <ListView 
     android:id="@+id/list" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:divider="@color/list_divider" 
     android:dividerHeight="1dp" 
     android:listSelector="@drawable/list_row_selector" /> 
    </LinearLayout> 
</LinearLayout>

listrow.xml

<?xml version="1.0" encoding="utf-8"?> 
<!--Style for the list--> 

<android.support.percent.PercentRelativeLayout 
    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:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior" > 
    <RelativeLayout 
     xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:background="@drawable/list_row_selector" 
     app:layout_heightPercent="33%" 
     app:layout_widthPercent="100%"> 

     <!-- Background Image --> 
     <LinearLayout 
      android:id="@+id/bkgImage" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:background="@drawable/coffe" 
      android:orientation="vertical" 
      android:alpha="0.65"/> 

     <LinearLayout 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:orientation="vertical" 
      android:layout_gravity="bottom|start" 
      android:layout_alignParentBottom="true" 
      android:paddingLeft="10dp"> 

      <!-- Shop Title --> 
      <TextView 
       android:id="@+id/title" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:text="Test" 
       android:textSize="@dimen/title" 
       android:textStyle="bold" 
       android:textColor="@color/genre" 
       android:alpha="1.0"/> 

      <!-- Description --> 
      <TextView 
       android:id="@+id/description" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_below="@id/title" 
       android:layout_marginTop="5dp" 
       android:layout_marginBottom="10dp" 
       android:text="blah blah blahg blah blah blah " 
       android:textColor="@color/genre" 
       android:textSize="@dimen/genre" /> 

     </LinearLayout> 
    </RelativeLayout> 
</android.support.percent.PercentRelativeLayout>

私は他のチュートリアルを見てきましたが、それらはすべて同じロジックを使って動作するように見えますが、3は試しましたがまだ内容はありませんでした。

ログイン：あなたのListViewの高さが正しくないため

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出典

2016-04-10 baldemora

'getView'が呼び出された回数と' shopClass shop = getItem（position）; 'が正しいshopインスタンスを返すかどうか' getView'が呼び出されるたびにいくつかのログを出力することをお勧めします。 – shhp

@shhp今はクラッシュして、私はなぜそれがわからないのですか？ – baldemora

'shopList =（ListView）findViewById（R.id.list）;'はnullオブジェクトを返します。ここの 'R'はあなたのパッケージのアンドロイドではないと確信していますか？ – shhp

似たような問題を抱えている人は、<android.support.percent.PercentRelativeLayoutというスキーマが正常に機能していないという問題がありました。

出典

2017-06-29 11:42:24 baldemora

たぶん問題があります。 android:layout_heightをwrap_contentからmatch_parentに変更してみてください。

出典

2016-04-10 07:28:39 shhp

はまだ空を表示していますが、getViewを5回呼び出すだけです。私が持っている物体の数はどれくらいですか – baldemora

LIstViewアダプタがカスタムアダプタでコンテンツを表示しない

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