[英]How to get the item position in a ListView and GridView outside the adapter?
我正在尝试通过他的视图层次结构获取视图 position。
当我有 RecyclerView 时,为了获取当前视图 position 我会:
if(view.getParent() instanceof RecyclerView){
RecyclerView rv = (RecyclerView)view.getParent();
if(rv.getLayoutManager()!=null) {
position = rv.getLayoutManager().getPosition(view);
}
}
但是当出现ListView 或 GridView时,我无法让布局管理器获取视图的 position。 这个想法是在不知道视图具有的自定义适配器的情况下以通用方式制作它。
我试图通过 ListView 和 GridView 适配器获取 position,但我没有看到任何方法可以做到这一点。
有人可以帮助我吗? 十分感谢!
为外部适配器 class 创建接口以获取 position
这是适配器代码:
public class ReportMediaAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private ArrayList<File> reportMediaList = new ArrayList<>();
private Context context;
private int selectedPos = -1;
private OnRemoveImage onRemoveImage;
public ReportMediaAdapter(Context context, ArrayList<File> reportMediaList, OnRemoveImage onRemoveImage) {
this.reportMediaList = reportMediaList;
this.onRemoveImage = onRemoveImage;
this.context = context;
}
**public interface OnRemoveImage {
void onRemove(int pos);
}**
public class MyViewHolder extends RecyclerView.ViewHolder {
private ImageView iv_image, iv_remove;
public MyViewHolder(View itemView) {
super(itemView);
iv_image = itemView.findViewById(R.id.iv_image);
iv_remove = itemView.findViewById(R.id.iv_remove);
}
}
@Override
public int getItemCount() {
return reportMediaList.size()-1;
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.adapter_media, parent, false);
return new MyViewHolder(itemView);
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
try {
MyViewHolder menuItemHolder = (MyViewHolder) holder;
CommonMethods.loadImage(context, reportMediaList.get(position), menuItemHolder.iv_image);
menuItemHolder.iv_remove.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
**onRemoveImage.onRemove(position);**
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
}
这是活动代码:
@Override
public void onRemove(int pos) {
// use adapter position
}
我找到了一个解决方案:
if(view.getParent() instanceof ViewGroup) {
position = ((ViewGroup)view.getParent()).indexOfChild(view);
}
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