适配器中的 java.lang.IllegalArgumentException

Question

我想列出通过此适配器接收到的 JSON 数据，但是我收到一个错误，指出他没有设法找到 View ，我在日志中收到的错误是“java.lang.IllegalArgumentException: View 不能为空”

  public class categoriaAdapter extends ArrayAdapter {

    private List<categoriaModel> categoriaModelList;
    private int resource;
    private LayoutInflater inflater;

    public categoriaAdapter(Context context, int resource, List<categoriaModel> objects) {
        super(context, resource, objects);
        categoriaModelList = objects;
        this.resource = resource;
        inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
    }

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

        ViewHolder holder = null;




        if (convertView == null){
            holder = new ViewHolder();
            convertView = inflater.inflate(resource, null);
            holder.imgCategoria = (ImageView)convertView.findViewById(R.id.ivIcon);
            holder.catTitulo = (TextView)convertView.findViewById(R.id.tvMovie);
            holder.catDesc = (TextView)convertView.findViewById(R.id.tvTagline);
            holder.catID = (TextView)convertView.findViewById(R.id.tvYear);
            convertView.setTag(holder);

        } else{
            holder = (ViewHolder) convertView.getTag();
        }

        final ProgressBar progressBar = (ProgressBar)convertView.findViewById(R.id.progressBar);

        ImageLoader.getInstance().displayImage(categoriaModelList.get(position).getImage(), holder.imgCategoria, new ImageLoadingListener() {
            @Override
            public void onLoadingStarted(String imageUri, View view) {
                progressBar.setVisibility(View.VISIBLE);
            }

            @Override
            public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
                progressBar.setVisibility(View.GONE);
            }

            @Override
            public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
                progressBar.setVisibility(View.GONE);
            }

            @Override
            public void onLoadingCancelled(String imageUri, View view) {
                progressBar.setVisibility(View.GONE);
            }
        });



        holder.catTitulo.setText(categoriaModelList.get(position).getNome());
        holder.catDesc.setText(categoriaModelList.get(position).getDescricacao());
        holder.catID.setText(categoriaModelList.get(position).getIdeCategoria());



        return convertView;
    }

    class ViewHolder{
        ImageView imgCategoria;
        TextView catTitulo;
        TextView catDesc;
        TextView catID;
    }
}

还有我的 Error logs

Answer 1

请检查您的布局 (xml) 并查看 R.id.ivIcon 是否为 imageView 或者它是否存在于 resource 布局中。确保 imgCategoria 不为 null 并且在调用 displayImage 之前已正确初始化。

同时初始化 ImageLoader 配置。即

 ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(context).build();
 ImageLoader.getInstance().init(config);
 ImageLoader.getInstance().displayImage(categoriaModelList.get(position).getImage(), holder.imgCategoria, new ImageLoadingListener() {
        @Override
        public void onLoadingStarted(String imageUri, View view) {
            progressBar.setVisibility(View.VISIBLE);
        }

        @Override
        public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
            progressBar.setVisibility(View.GONE);
        }

        @Override
        public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
            progressBar.setVisibility(View.GONE);
        }

        @Override
        public void onLoadingCancelled(String imageUri, View view) {
            progressBar.setVisibility(View.GONE);
        }
    });

希望对你有帮助