我想在删除列表项时更新/刷新 ListView

Question

我想在 ListView 项行中单击 ImageView 时刷新/更新 ListView 数据。

这是我的适配器class

public class ListImageAdapter extends BaseAdapter {

private LayoutInflater layoutInflater;
private List<EntityObject> dataStorage;

private Context context;

public ListImageAdapter(Context context, List<EntityObject> customizedListView) {
    this.layoutInflater =(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    this.context = context;
    this.dataStorage = customizedListView;
}

@Override
public int getCount() {
    return dataStorage.size();
}

@Override
public Object getItem(int position) {
    return dataStorage.get(position);
}

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

@Override
public View getView(int position, View convertView, final ViewGroup parent) {
    final ViewHolder listViewHolder;
    if(convertView == null){
        listViewHolder = new ViewHolder();
        convertView = layoutInflater.inflate(R.layout.list_images, parent, false);

        listViewHolder.downloadedImage = (ImageView)convertView.findViewById(R.id.displayed_image);
        listViewHolder.deleteIcon = (ImageView)convertView.findViewById(R.id.delete_image);
        listViewHolder.imageFilename = (TextView)convertView.findViewById(R.id.downloaded_filename);
        convertView.setTag(listViewHolder);
    }else{
        listViewHolder = (ViewHolder) convertView.getTag();
    }

    listViewHolder.imageFilename.setText(dataStorage.get(position).getName());
    Uri imageUri = Uri.fromFile(new File(Helper.PATH_TO_EXTERNAL_STORAGE + File.separator + dataStorage.get(position).getImage()));
    Glide.with(context).load(imageUri).override(90, 90).centerCrop().into(listViewHolder.downloadedImage);

    listViewHolder.deleteIcon.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String deleteImageName = listViewHolder.imageFilename.getText().toString();
            String deletePath = Helper.PATH_TO_EXTERNAL_STORAGE + File.separator + deleteImageName;
            File deleteFile = new File(deletePath);
            if(deleteFile.exists()){
                deleteFile.delete();
                Toast.makeText(context, "The image has been deleted", Toast.LENGTH_LONG).show();
            }
        }
    });
    return convertView;
}
public void refreshDataStorage(List<EntityObject> listObject) {
    this.dataStorage = listObject;
    this.notifyDataSetChanged();
}

static class ViewHolder{

    ImageView downloadedImage;

    ImageView deleteIcon;

    TextView imageFilename;
}

我试过在Activityclass中调用这个方法，但是删除后没有更新ListView数据

public void refreshDataStorage(List<EntityObject> listObject) {
this.dataStorage = listObject;
this.notifyDataSetChanged();
}

该方法在宿主的onCreate()方法中调用Activityclass

        /// add an adapter for the listView
        workingDataSource = returnDataSource(mainStorageDirectory);
        listImageAdapter = new ListImageAdapter(ListImagesActivity.this, workingDataSource);
        listAllImages.setAdapter(listImageAdapter);

        listImageAdapter.refreshDataStorage(workingDataSource);

感谢任何形式的帮助

Answer 1

给你，

@Override
public View getView(int position, View convertView, final ViewGroup parent) {
    final ViewHolder listViewHolder;
    if(convertView == null){
        listViewHolder = new ViewHolder();
        convertView = layoutInflater.inflate(R.layout.list_images, parent, false);

        listViewHolder.downloadedImage = (ImageView)convertView.findViewById(R.id.displayed_image);
        listViewHolder.deleteIcon = (ImageView)convertView.findViewById(R.id.delete_image);
        listViewHolder.imageFilename = (TextView)convertView.findViewById(R.id.downloaded_filename);
        convertView.setTag(listViewHolder);
    }else{
        listViewHolder = (ViewHolder) convertView.getTag();
    }

    listViewHolder.imageFilename.setText(dataStorage.get(position).getName());
    Uri imageUri = Uri.fromFile(new File(Helper.PATH_TO_EXTERNAL_STORAGE + File.separator + dataStorage.get(position).getImage()));
    Glide.with(context).load(imageUri).override(90, 90).centerCrop().into(listViewHolder.downloadedImage);

    listViewHolder.deleteIcon.setTag(position);

    listViewHolder.deleteIcon.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String deleteImageName = listViewHolder.imageFilename.getText().toString();
            String deletePath = Helper.PATH_TO_EXTERNAL_STORAGE + File.separator + deleteImageName;
            File deleteFile = new File(deletePath);
            if(deleteFile.exists()){
                deleteFile.delete();
                dataStorage.remove((Integer) v.getTag());
                notifyDataSetChanged();
            }
        }
    });
    return convertView;
}

Answer 2

请改成

public void refreshDataStorage(List<EntityObject> listObject) {
    this.dataStorage.clear();
    this.dataStorage.addAll(listObject);
    this.notifyDataSetChanged();
}

Answer 3

正如我的评论，您已删除文件，但是 listObject 未更新（其项目未删除）。所以，请像下面这样调用

listObject.remove(...); 
adapter.notifyDataSetChanged();

我想在删除列表项时更新/刷新 ListView

I want to update /refresh a ListView when a List item is deleted

android

listview

baseadapter