Question

我有一个实现RecyclerView.Adapter的类，并且在onBindViewHolder中调用onClick监听器来访问另一个Fragment。我有这个错误，并指回上下文。代码snipet如下：

$printClass = [wmiclass]'win32_printer'
$printClass.AddPrinterConnection($printer)

我已经在全球范围内实施了我的上下文，并且被告知这不是一个好习惯。下面是我需要访问的完整类和Fragment类。

((FragmentActivity)context).getSupportFragmentManager().beginTransaction()
                    .replace(R.id.container, fragment)
                    .commit();

}

要访问的片段类

public class Topdeal_CustomAdapter extends RecyclerView.Adapter<Topdeal_CustomAdapter.ViewHolder> {

public static final String CATEGORY_NAME = "name";
public static final String CATEGORY_IMAGE = "image";
public static final String the_Id = "000000000";

private List<Categories_ItemObject> categories_List;
private Context context;


public Topdeal_CustomAdapter(List<Categories_ItemObject> developersLists, Context context) {
    this.categories_List = developersLists;
    this.context = context;
 }

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

     View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.single_topdeal, parent, false);
    return new Topdeal_CustomAdapter.ViewHolder(v);

}

@Override
public void onBindViewHolder(final ViewHolder holder, int position) {

    final Categories_ItemObject developersList = categories_List.get(position);
    holder.name.setText(developersList.getCategoryName());

    Picasso.with(context).load(developersList.getCategoryPicture()).into(holder.picture);

    holder.picture.setOnClickListener(new View.OnClickListener(context) {
        @Override
        public void onClick(View v) {


            TopDeal_two fragment = new TopDeal_two();
            Bundle bundle = new Bundle();
            bundle.putString(CATEGORY_NAME, developersList.getCategoryName());
            fragment.setArguments(bundle);
            ((FragmentActivity)context).getSupportFragmentManager().beginTransaction()
                    .replace(R.id.container, fragment)
                    .commit();

        }
    });


}



@Override
public int getItemCount() {
    return categories_List.size();
}

public class ViewHolder extends RecyclerView.ViewHolder {
    ImageView picture;
    TextView name;
    LinearLayout relativeLayout;

    public ViewHolder(View itemView) {
        super(itemView);

        picture = itemView.findViewById(R.id.category_image);
        name = itemView.findViewById(R.id.category_name);
        relativeLayout = itemView.findViewById(R.id.linearLayout_category);
    }
}

}

mAJOR问题在FragmentActivity上...... getSupportFragmentManager ....

Answer 1

应用程序上下文不能转换为其他类型的上下文。

看起来您正在使用应用程序上下文创建Topdeal_CustomAdapter，但随后在适配器内部将其转换为FragmentActivity。

最好在创建适配器时使用活动上下文（'this'），因为适配器与您的活动生命周期相关联。

android.app.Application无法在clcik上强制转换为android.support.v4.app.FragmentActivity

1 个答案: