Question

所以我试图能够从我自己制作的自定义适配器中更改列表项的外观。当我从自定义适配器的列表项中单击一个按钮时，我希望它能够改变。 This is an example of a Custom List Item looks like. 当我单击Button时，我希望它执行一个操作来修改布局。例如，单击按钮后，我希望它隐藏另一个按钮，或更改按钮的文本。出于某种原因，单击它们时这些命令似乎没有任何效果。

我的最终目标是能够在按钮点击时调整列表项的大小。但正如我所提到的，似乎没有任何效果。在onClick方法之外设置可见性似乎有效，但在内部进行此操作并不适用。我知道代码已经到达，但我相信它与适配器没有更新有关，但我在那里有notifyDataSetChanged方法。任何帮助表示赞赏。感谢。

这是我的自定义适配器代码

class CustomAdapter extends ArrayAdapter<Player> {
Button button, button2;

public CustomAdapter(Context context, ArrayList<Player> players) {
    super(context, R.layout.player_expanded, players);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    LayoutInflater infater = LayoutInflater.from(getContext());
    final View customView = infater.inflate(R.layout.custom_list_item, parent, false);

    button = (Button) customView.findViewById(R.id.button);
    button2 = (Button) customView.findViewById(R.id.button2);
    button2.setVisibility(View.VISIBLE);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            button2.setVisibility(View.GONE);   //Doesn't take effect
            notifyDataSetChanged();
        }
    });

    return customView;
  }
}

我的Custom_List_Item.xml

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

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="New Text"
    android:id="@+id/textView3"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="New Button"
    android:layout_alignParentTop="true"
    android:focusable="false"  
    android:id="@+id/button"  />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="New Button"
    android:focusable="false"
    android:id="@+id/button2" />
 </LinearLayout>

Answer 1

尝试如下：

class CustomAdapter extends ArrayAdapter<Player> {

private static class ViewHolder {
    Button button, button2;
}

public CustomAdapter(Context context, ArrayList<Player> players) {
super(context, R.layout.player_expanded, players);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder; // view lookup cache stored in tag
   if (convertView == null) {
      viewHolder = new ViewHolder();
      LayoutInflater infater = LayoutInflater.from(getContext());
final View customView = infater.inflate(R.layout.custom_list_item, parent, false);

viewHolder.button = (Button) customView.findViewById(R.id.button);
viewHolder.button2 = (Button) customView.findViewById(R.id.button2);

viewHolder.button.setTag(position);
viewHolder.button2.setTag(position);
convertView.setTag(viewHolder);
} else {
       viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.button2.setVisibility(View.VISIBLE);
viewHolder.button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        viewHolder.button2.setVisibility(View.GONE);   //Doesn't take effect
        notifyItemChanged(Integer.valueOf(v.getTag().toString()));
    }
});

return customView;
}
}

Answer 2

调用notifyDataSetChanged（）会导致ListView重建所有内容。它将删除其setVisibility，为所有可见的项调用getView（）。为此，您需要一个逻辑并管理按钮的可见性。

Answer 3

这种情况正在发生，因为您在onClick内部使按钮不可见，然后通知您的适配器。

现在您在适配器中写了button2.setVisibility(View.VISIBLE);。所以每当你的适配器得到通知，它将再次将按钮的可见性设置为可见。

简单的方法是使用SparseBooleanArray。

class CustomAdapter extends ArrayAdapter<Player> {

    Button button, button2;
    SparseBooleanArray mArray;

    public CustomAdapter(Context context, ArrayList<Player> players) {
        super(context, R.layout.player_expanded, players);
        mArray = new SparseBooleanArray(lenth of your list);
    }

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

        if (convertView == null) {
            LayoutInflater infater = LayoutInflater.from(getContext());
            final View customView = infater.inflate(R.layout.custom_list_item, parent, false);

            button = (Button) customView.findViewById(R.id.button);
            button2 = (Button) customView.findViewById(R.id.button2);
        }
        if(mArray.get(position)){
            button2.setVisibility(View.GONE);
        }else if(!mArray.get(position)){
            button2.setVisibility(View.VISIBLE);
        }

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mArray.put(position, true);
                notifyDataSetChanged();
            }
        });

        return customView;
    }
}

希望这对你有用。

在内部按钮上更新自定义适配器内容单击

3 个答案: