ListView personnalisé n'affiche pas les entrées

Question

J'ai créé un ListView personnalisé avec un BaseAdapter. Lorsque je démarre l'activité, je vois un ListView vide sans entrées.

est ici la classe Adapter:

public class SpeiseplanListAdapter extends BaseAdapter { 

private ArrayList<SpeiseplanEntry> data; 
private Context context; 


public SpeiseplanListAdapter(ArrayList<SpeiseplanEntry> data, Context context) { 
    this.data = data; 
    this.context = context; 
} 

@Override 
public int getCount() { 
    return data.size(); 
} 

@Override 
public Object getItem(int position) { 
    return data.get(position); 
} 

@Override 
public long getItemId(int position) { 
    return position; 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    View entry = inflater.inflate(R.layout.layout_list_entry, parent, false); 

    TextView day = (TextView) entry.findViewById(R.id.text_day); 
    TextView date = (TextView) entry.findViewById(R.id.text_date); 
    TextView firstDish = (TextView) entry.findViewById(R.id.text_first_dish); 
    TextView secondDish = (TextView) entry.findViewById(R.id.text_second_dish); 

    SpeiseplanEntry current = data.get(position); 

    day.setText(current.getDay()); 
    date.setText(current.getDate()); 
    firstDish.setText(current.getFirstDish()); 
    secondDish.setText(current.getSecondDish()); 

    return entry; 
} 
} 

La méthode OnCreate():

protected void onCreate(Bundle savedInstanceState) { 

    ... 

    ListView listView = (ListView) findViewById(R.id.list_speiseplan); 
    SpeiseplanListAdapter adapter = new SpeiseplanListAdapter(entries, getApplicationContext()); 
    listView.setAdapter(adapter); 

    ... 

} 

La mise en page d'une seule ligne:

<android.support.constraint.ConstraintLayout 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:orientation="vertical" 
             android:layout_width="match_parent" 
             android:layout_height="120dp"> 

<TextView 
     android:text="MO" 
     android:layout_width="wrap_content" 
     android:layout_height="35dp" android:id="@+id/text_day" android:fontFamily="monospace" 
     android:typeface="monospace" android:textSize="30sp" 
     android:textColor="@color/colorPrimary" 
     app:layout_constraintTop_toTopOf="parent" 
     android:layout_marginTop="24dp" android:layout_marginLeft="28dp" 
     app:layout_constraintLeft_toLeftOf="parent" android:layout_marginStart="28dp"/> 
<TextView 
     android:layout_width="250dp" 
     android:layout_height="38dp" 
     android:id="@+id/text_first_dish" 
     app:layout_constraintTop_toTopOf="parent" android:layout_marginTop="16dp" 
     app:layout_constraintLeft_toRightOf="@+id/text_day" android:layout_marginLeft="40dp" 
     android:textSize="16sp" android:textAlignment="textStart" 
     android:text="firstDish" 
     android:gravity="center_vertical" 
     android:layout_marginStart="40dp"/> 
<TextView 
     android:layout_width="250dp" 
     android:layout_height="38dp" 
     android:id="@+id/text_second_dish" 
     app:layout_constraintBottom_toBottomOf="parent" android:layout_marginBottom="16dp" 
     app:layout_constraintLeft_toRightOf="@+id/text_day" android:layout_marginLeft="40dp" 
     android:textSize="16sp" android:text="secondDish" 
     android:gravity="center_vertical" 
     android:layout_marginStart="40dp"/> 
<TextView 
     android:text="21.09." 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" android:id="@+id/text_date" 
     android:layout_marginLeft="16dp" app:layout_constraintLeft_toLeftOf="parent" android:textSize="18sp" 
     android:fontFamily="monospace" android:typeface="monospace" android:textColor="@color/colorAccent" 
     app:layout_constraintBottom_toBottomOf="parent" android:layout_marginBottom="32dp" 
     android:layout_marginStart="16dp"/> 

La disposition du Activity:

<android.support.constraint.ConstraintLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context="de.gymoth.goapp.SpeiseplanActivity" tools:layout_editor_absoluteY="81dp" 
    tools:layout_editor_absoluteX="0dp"> 
<ListView 
     android:layout_width="0dp" 
     android:layout_height="0dp" 
     android:id="@+id/list_speiseplan" 
     tools:layout_constraintTop_creator="1" 
     tools:layout_constraintRight_creator="1" 
     tools:layout_constraintBottom_creator="1" 
     android:layout_marginStart="0dp" 
     app:layout_constraintBottom_toBottomOf="parent" 
     android:layout_marginEnd="0dp" 
     app:layout_constraintRight_toRightOf="parent" 
     android:layout_marginTop="8dp" 
     tools:layout_constraintLeft_creator="1" 
     android:layout_marginBottom="0dp" 
     app:layout_constraintLeft_toLeftOf="parent" 
     app:layout_constraintTop_toTopOf="parent" 
     android:layout_marginLeft="0dp" 
     android:layout_marginRight="0dp" app:layout_constraintHorizontal_bias="0.0" 
     app:layout_constraintVertical_bias="0.0" android:divider="@color/divider" android:dividerHeight="1dp"/> 

Y at-il un problème avec le ConstraintLayout j'ai utilisé pour la seule ligne? Ou est le Adapter le problème? Toute aide est appréciée.

Answer 1

d'abord mis une condition au moment gonflent ...

if(convertView==null){ 
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
View entry = inflater.inflate(R.layout.layout_list_entry, parent, false); 
} 

alors l'utilisation de support adaptateur ..

Answer 2

Utilisez comme cette

protected void onCreate(Bundle savedInstanceState) { 
... 

ListView listView = (ListView) findViewById(R.id.list_speiseplan); 
SpeiseplanListAdapter adapter = new SpeiseplanListAdapter(entries, YourActivityName.this); 
listView.setAdapter(adapter); 

... 
}