ListView出现问题 [英] Trouble with ListView

问题描述

我的主要活动和ListView出现问题，我绝对不了解它的工作原理...

I have an issue with my Main Activity and a ListView and I absolutly don't understand how it works...

好！这就是我想要的:

期望

这意味着我需要一个项目列表:TextViews

It means I need a list of item : TextViews

此列表的外侧还有一个简单的按钮.我不希望该按钮成为列表的一部分.

And OUTSIDE of this list a simple button. I don't want the button to be part of the list.

但是，这就是我所拥有的:

But here is what I have :

现实

如您所见，在我列表的每个孩子中，我都有我的文字和我的按钮:为什么?

As you can see, in every child of my list i have my text AND my button : Why ??

我的代码Main:

public class MainMenu extends AppCompatActivity implements IRemDeck, IRemCard {

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

    ListView listView = findViewById(R.id.MainDecksList);
    AdapterDeck adpDeck;
    ArrayList<Deck> myDecks = new ArrayList<>();
    for (int i = 0; i<5;i++){
        myDecks.add(new Deck("Deck " + i));
    }

    adpDeck = new AdapterDeck(this, 0, myDecks);
    listView.setAdapter(adpDeck);

}

我的适配器(用于ListView):

My Adapter (for the ListView) :

public AdapterDeck(@NonNull Context context, int resource, @NonNull ArrayList<Deck> decks) {
    super(context, resource, decks);
    this.decks = decks;
    this.context = context;
}


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

@Override
public Deck getItem(int pos) {
    return decks.get(pos);
}

@Override
public long getItemId(int pos) {
    return 0;
    //just return 0 if your list items do not have an Id variable.
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    View view = convertView;
    if (view == null) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = inflater.inflate(R.layout.activity_main_menu, null);
    }

    //Handle TextView and display string from your list
    TextView listItemText = view.findViewById(R.id.MainDeckNom);
    listItemText.setText(decks.get(position).getNom());


    return view;
}

XML:

<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".activities.MainMenu">

<TextView
    android:id="@+id/MainDeckNom"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<ListView
    android:id="@+id/MainDecksList"
    android:layout_width="363dp"
    android:layout_height="426dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:layout_marginEnd="8dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<Button
    android:id="@+id/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="8dp"
    android:layout_marginEnd="8dp"
    android:layout_marginBottom="8dp"
    android:text="Button"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/MainDecksList" />

</android.support.constraint.ConstraintLayout>

如果有人可以向我解释如何解决我的问题(以及最终如何解决)，我将不胜感激！

If someone could explain to me how to solve my problem (and how it works eventually) I would be very grateful !

非常感谢:)

推荐答案

listview必须具有自己的布局，因此您需要创建一个仅包含listview的新布局，并在getView()方法中将其用作您的一行listView

listview has to have its own layout, so you need to create a new layout that just contains listview and in getView() method use it as a row of your listView

1-创建一个新的row_listview.xml

<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".activities.MainMenu">

<TextView
    android:id="@+id/MainDeckNom"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />



</android.support.constraint.ConstraintLayout>

2-更改此行

    view = inflater.inflate(R.layout.activity_main_menu, null);

到

    view = inflater.inflate(R.layout.row_listview, null);

这篇关于ListView出现问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！