Question

我有一个自定义微调器适配器，该适配器在下拉菜单中显示简单的img +文本。但是，对于某些物品，应该按如下所述隐藏图像。

我的问题是，由于某种原因，当选择了应隐藏图像的项目时， setVisibility（GONE）似乎根本没有任何作用。

知道为什么吗？当该项目不是下拉菜单中的选定项目时，图像消失得很好。仅当我使用ConstraintLayout而不是RelativeLayout时，这种情况才会发生。

这是代码。

public class CloudListAdapter extends ArrayAdapter<CloudDisplayData> {
    private List<CloudDisplayData> data;
    private int resource;
    private LayoutInflater inflater;
    private Context context;

    public CloudListAdapter(@NonNull Context context, int resource, List<CloudDisplayData> data) {
        super(context, resource);
        this.data = data;
        this.resource = resource;
        this.context = context;
        inflater = LayoutInflater.from(context);
    }

    @Override
    public boolean hasStableIds() {
        return false;
    }

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

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

    @Override
    public View getDropDownView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        View result;
        if (convertView == null) {
            result = inflater.inflate(resource, parent, false);
        }else{
            result=convertView;
        }

        ImageView img = result.findViewById(R.id.img_server);
        TextView text = result.findViewById(R.id.label_server);

        text.setText(data.get(position).name);

        if (data.get(position).img_resource > 0) {
            if (data.get(position).tintOn) {
                img.setColorFilter(ContextCompat.getColor(context, R.color.white));
            } else {
                img.setColorFilter(null);
            }
            img.setVisibility(VISIBLE);
            img.setImageResource(data.get(position).img_resource);
        } else {
            img.setVisibility(GONE);
        }

        text.setTextColor(ContextCompat.getColor(context, R.color.white));

        return result;
    }

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

        if (convertView == null)
            convertView = inflater.inflate(resource, parent, false);

        TextView text = convertView.findViewById(R.id.label_server);

        text.setText(data.get(position).name);
        text.setTextColor(ContextCompat.getColor(context, R.color.colorPrimary));

        return text;
    }
}

资源就是这样：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:id="@+id/cl_server"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="@color/colorPrimaryDark"
  android:padding="10dp">

    <ImageView
        android:id="@+id/img_server"
        android:layout_width="32dp"
        android:layout_height="32dp"
        android:contentDescription="@string/img_content_description"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/cloud" />

    <TextView
        android:id="@+id/label_server"
        android:layout_width="wrap_content"
        android:layout_height="32dp"
        android:gravity="start|center_vertical"
        android:paddingLeft="10dp"
        android:text="@string/label_zotero"
        android:textColor="@color/white"
        android:textSize="16sp"
        app:layout_constraintLeft_toRightOf="@+id/img_server"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

选择项目后，自定义SpinnerAdapter无法正确呈现

0 个答案: