getDrawable(int) 在这一行中被弃用警告： Drawable res = getContext().getResources().getDrawable(item.img_resId);

Question

我创建了自己的自定义适配器。在这段代码中，我在这一行中得到 getDrawable(int) is deprecated 警告：Drawable res = getContext().getResources().getDrawable(item.img_resId);。

我经历了这些：

Android getResources().getDrawable() deprecated API 22

Android: Alternative for context.getDrawable()

但在我的情况下，它们都不起作用。

我的代码：

public class CustomAdapter extends ArrayAdapter<ItemDataObject> {
private static class ViewHolder {
    ImageView img;
    TextView title;
    TextView sub_title;
}

public CustomAdapter(Context context, ArrayList<ItemDataObject> list_item_details) {
    super(context, 0, list_item_details);
}

@NonNull
@Override
public View getView(int position, View convertView, @NonNull ViewGroup parent) {
    // Get the data item for this position
    ItemDataObject item = getItem(position);
    // Check if an existing view is being reused, otherwise inflate the view
    ViewHolder viewHolder; // view lookup cache stored in tag
    if (convertView == null) {
        // If there's no view to re-use, inflate a brand new view for row
        viewHolder = new ViewHolder();
        LayoutInflater inflater = LayoutInflater.from(getContext());
        convertView = inflater.inflate(R.layout.listview_item, parent, false);
        viewHolder.img = convertView.findViewById(R.id.img);
        viewHolder.title = convertView.findViewById(R.id.tvTitle);
        viewHolder.sub_title = convertView.findViewById(R.id.tvSubTitle);
        // Cache the viewHolder object inside the fresh view
        convertView.setTag(viewHolder);
    } else {
        // View is being recycled, retrieve the viewHolder object from tag
        viewHolder = (ViewHolder) convertView.getTag();
    }
    // Populate the data from the data object via the viewHolder object into the template view.
    assert item != null;
    Drawable res = getContext().getResources().getDrawable(item.img_resId);
    viewHolder.img.setImageDrawable(res);
    viewHolder.title.setText(item.title);
    viewHolder.sub_title.setText(item.subtitle);
    // Return the completed view to render on screen
    return convertView;
    }
}

Answer 1

现在你应该使用

Drawable drawable = ContextCompat.getDrawable(this,R.drawable.my_drawable);

如果您使用小部件，this 是您传递的 context，如果您从 Activity 调用，则为 this，如果您从 Fragment 调用，则为 getActivity()

在您的情况下，当您初始化 Widget 时，还要保存您的 Context 实例：

Context context;
public CustomAdapter(Context context, ArrayList<ItemDataObject> list_item_details) {
    super(context, 0, list_item_details);
    this.context = context;
}

现在你可以打电话了：

Drawable drawable = ContextCompat.getDrawable(context,R.drawable.my_drawable);