Question

我想在Fragment中使用ArrayAdapter设置Listview.Here是我的所有代码。

Fragment :::

public class HairstylesFragment extends Fragment {
    ListView HairStylelz;
    Integer[] imageId = {
            R.drawable.man_menu_buzz,
            R.drawable.man_menu_buzz,
            R.drawable.man_menu_buzz,
            R.drawable.man_menu_buzz,
            R.drawable.man_menu_buzz,
            R.drawable.man_menu_buzz,
            R.drawable.man_menu_buzz
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_hairstyles, container, false);
        HairStylelz=(ListView)view.findViewById(R.id.Listview_HairStyle);

        HairStylez_Adapter  adapter = new HairStylez_Adapter(view.getContext(),imageId);
        HairStylelz.setAdapter(adapter);

        return view;
    }
}

ArrayAdapter ::

public class HairStylez_Adapter extends ArrayAdapter<String> {

     Integer[] imageId;
    Context context;



    public HairStylez_Adapter(Context context, Integer[] imageId) {
        super(context, R.layout.listview_adapter_hairstyle);
        this.context=context;
        this.imageId=imageId;

    }


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

        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        View rowView= inflater.inflate(R.layout.listview_adapter_hairstyle, null, true);
        ImageView imageView = (ImageView) rowView.findViewById(R.id.Hairstyle_imageview);
        imageView.setImageResource(imageId[position]);

        Log.d("settingup","");
        return rowView;
    }
}

但Listview没有设置其显示空白屏幕。我的代码中有没有丢失？帮助在片段中设置Listview

由于

Answer 1

getView（）方法内部：

if (view == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.listview_adapter_hairstyle, parent, true);
}
ImageView imageView = (ImageView) view.findViewById(R.id.Hairstyle_imageview);
imageView.setImageResource(imageId[position]);

Log.d("settingup","");
return view; //You are initialing view and returning rowView which is wrong.

如果视图为null，则应仅对视图进行一次充气。并且在充气时传递父项。

Answer 2

您需要通过调用add（someValue）

将String数据添加到ArrayAdapter

Answer 3

根据您的使用案例，我建议您使用BaseAdapter并覆盖getCount()，getItemId(int position)和getItem(int position)方法并返回imageId.length，0和imageId [position]。以下是BaseAdapter的示例实现。

public class CustomBaseAdapter extends BaseAdapter {
        Integer[] imageId;
        Context context;
         
        public CustomBaseAdapter(Context context, Integer[] imageId) {
            this.context=context;
            this.imageId=imageId;
        }

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

            LayoutInflater inflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            View rowView= inflater.inflate(R.layout.listview_adapter_hairstyle, null, true);
            ImageView imageView = (ImageView) rowView.findViewById(R.id.Hairstyle_imageview);
            imageView.setImageResource(getItem(position));

            Log.d("settingup","");
            return rowView;
        }

        @Override
        public int getCount() {     
            return imageId.length;
        }

        @Override
        public Integer getItem(int position) {
            return imageId[position];
        }

        @Override
        public long getItemId(int position) {
            return 0;
        }
}

片段中的Listview使用ArrayAdapter未设置

3 个答案: