我有一个GridView和适用于GridView的适配器（BasketAdapter扩展BaseAdapter）。
我从sharedpref文件加载GridView中的数据。
更改数据后，我使用数据重新保存sharedpref文件并调用notifyDataSetChanged()。
但遗憾的是，notifyDataSetChanged()无效。
如果我创建新适配器并将其设置为GridView，则可以正常工作。
任何人都可以帮我解决这个问题吗？
这是我的代码：
public class FragmentBasket extends SherlockFragment {
// my gridview
GridView gvCatalogAllStoneBasket;
// list of data from shared pref
ArrayList<CatalogItem> catalogItemBasket = new ArrayList<CatalogItem>();
ActionMode mode;
public static CatalogItem catalogItem;
// id variables for actionmode's actions
static final int ID_DELETE = 1;
static final int ID_EDIT = 2;
// shared pref id string
static String SHARED_PREFS_FILE = "basket";
// my adapter
BasketAdapter adapter = null;
public FragmentBasket() {
}
@Override
public void onStart() {
super.onStart();
// loading saved data from file
new GetCatalogAllStoneBasket().execute();
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Receiver receiver = new Receiver();
IntentFilter intentFilterAdd = new IntentFilter("com.example.myproject.ADD_ITEM_BASKET");
IntentFilter intentFilterEdit = new IntentFilter("com.example.myproject.EDIT_ITEM_BASKET");
IntentFilter intentFilterDelete = new IntentFilter("com.example.myproject.DELETE_ITEM_BASKET");
getActivity().registerReceiver(receiver, intentFilterAdd);
getActivity().registerReceiver(receiver, intentFilterEdit);
getActivity().registerReceiver(receiver, intentFilterDelete);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.right_panel_fragment_catalog_grid, container, false);
gvCatalogAllStoneBasket = (GridView)view.findViewById(R.id.gvCatalogAllStoneBasket);
gvCatalogAllStoneBasket.setOnItemLongClickListener(new OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
// start action mode and send id of clicked item
mode = getSherlockActivity().startActionMode(new ActionModeOfBasket(String.valueOf(view.getTag())));
return false;
}
});
return view;
}
private final class ActionModeOfBasket implements ActionMode.Callback
{
String itemId;
public ActionModeOfBasket(String itemId) {
// get id from clicked item
this.itemId = itemId;
}
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
menu.add(0, ID_EDIT, 0, "Edit")
.setIcon(android.R.drawable.ic_menu_edit)
.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS | MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW);
menu.add(0, ID_DELETE, 1, "Delete")
.setIcon(android.R.drawable.ic_menu_delete)
.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS | MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW);
return true;
}
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return false;
}
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
// get file
SharedPreferences sPref = getActivity().getSharedPreferences(SHARED_PREFS_FILE, getActivity().MODE_PRIVATE);
// open file for reading, writing
BasketHelper bHelper = new BasketHelper(sPref, getActivity());
switch (item.getItemId())
{
// if clicked del button
case ID_DELETE:
// delete item
bHelper.DelItem(itemId);
mode.finish();
catalogItemBasket = bHelper.GetAllItems();
break;
// if clicked edit button
case ID_EDIT:
// edit item
bHelper.EditItem(itemId, getFragmentManager());
mode.finish();
catalogItemBasket = bHelper.GetAllItems();
break;
}
return true;
}
@Override
public void onDestroyActionMode(ActionMode mode) {
}
}
class GetCatalogAllStoneBasket extends AsyncTask<String, String, String>
{
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected String doInBackground(String... params) {
SharedPreferences sPref = getActivity().getSharedPreferences(FragmentCatalogStonePosition.SHARED_PREFS_FILE, getActivity().MODE_PRIVATE);
try {
if(sPref.getString(FragmentCatalogStonePosition.TASK, null) != null)
{
BasketHelper bHelper = new BasketHelper(sPref, getActivity());
catalogItemBasket = bHelper.GetAllItems();
}
} catch (Exception e) {
Log.d(MainActivity.tag, e.getMessage() + " " + e.getCause());
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
adapter = new BasketAdapter(getActivity(), catalogItemBasket);
gvCatalogAllStoneBasket.setAdapter(adapter);
}
}
class Receiver extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent) {
if(intent.getAction().toString() == "com.example.myproject.ADD_ITEM_BASKET")
{
}
else if(intent.getAction().toString() == "com.example.myproject.EDIT_ITEM_BASKET")
{
// this code doesn't work (((
adapter.notifyDataSetChanged();
// this one successfully works
BasketAdapter bAdapter = new BasketAdapter(getActivity(), catalogItemBasket);
gvCatalogAllStoneBasket.setAdapter(bAdapter);
}
else if(intent.getAction().toString() == "com.example.myproject.DELETE_ITEM_BASKET")
{
}
}
}
class BasketAdapter extends BaseAdapter
{
Context context = null;
ArrayList<CatalogItem> data = null;
public BasketAdapter(Context context, ArrayList<CatalogItem> data) {
this.context = context;
this.data = data;
}
@Override
public int getCount() {
return data.size();
}
public CatalogItem getItem(int position) {
return data.get(position);
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
if(view == null)
{
LayoutInflater inflater = getLayoutInflater(null);
view = inflater.inflate(R.layout.right_panel_fragment_catalog_grid_item, parent, false);
CatalogItem item = getItem(position);
((TextView)view.findViewById(R.id.tvCatalogItemBasketName)).setText(item.name + " / " + item.code);
Double gPrice = Double.valueOf(item.price) * Double.valueOf(item.count);
((TextView)view.findViewById(R.id.tvCatalogItemBasketCount)).setText(String.valueOf(item.count));
((TextView)view.findViewById(R.id.tvCatalogItemBasketGeneralPrice)).setText(String.valueOf(gPrice));
((TextView)view.findViewById(R.id.tvCatalogItemBasketDescription)).setText(item.description);
final ImageView imgView = (ImageView)view.findViewById(R.id.ivCatalogItemBasketImage);
String strURL = "http://myproject.ua/images/stock/" + item.folder + "/" + item.images + "_800x600.jpg";
ImageLoaderConfiguration config = ImageHelper.ImageConfig(getActivity().getApplicationContext());
DisplayImageOptions options = ImageHelper.ImageOptions();
ImageLoader imageLoader = ImageLoader.getInstance();
imageLoader.init(config);
final ProgressBar pImgDialog = (ProgressBar)view.findViewById(R.id.pbImage);
imageLoader.displayImage(strURL, imgView, options, new ImageLoadingListener() {
@Override
public void onLoadingStarted(String imageUri, View view) {
pImgDialog.setVisibility(View.VISIBLE);
imgView.setVisibility(View.GONE);
}
@Override
public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
pImgDialog.setVisibility(View.GONE);
imgView.setVisibility(View.VISIBLE);
}
@Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
pImgDialog.setVisibility(View.GONE);
imgView.setVisibility(View.VISIBLE);
}
@Override
public void onLoadingCancelled(String imageUri, View view) {
pImgDialog.setVisibility(View.GONE);
imgView.setVisibility(View.VISIBLE);
}
});
view.setTag(item.catalog_id);
}
return view;
}
}
}
答案 0 :(得分：3)
如果View被回收，则您的convertView不为空，因此您的getView()应该是这样的：
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
if(view == null)
{
LayoutInflater inflater = getLayoutInflater(null);
view = inflater.inflate(R.layout.right_panel_fragment_catalog_grid_item, parent, false);
}
CatalogItem item = getItem(position);
((TextView)view.findViewById(R.id.tvCatalogItemBasketName)).setText(item.name + " / " + item.code);
Double gPrice = Double.valueOf(item.price) * Double.valueOf(item.count);
((TextView)view.findViewById(R.id.tvCatalogItemBasketCount)).setText(String.valueOf(item.count));
((TextView)view.findViewById(R.id.tvCatalogItemBasketGeneralPrice)).setText(String.valueOf(gPrice));
((TextView)view.findViewById(R.id.tvCatalogItemBasketDescription)).setText(item.description);
final ImageView imgView = (ImageView)view.findViewById(R.id.ivCatalogItemBasketImage);
String strURL = "http://myproject.ua/images/stock/" + item.folder + "/" + item.images + "_800x600.jpg";
ImageLoaderConfiguration config = ImageHelper.ImageConfig(getActivity().getApplicationContext());
DisplayImageOptions options = ImageHelper.ImageOptions();
ImageLoader imageLoader = ImageLoader.getInstance();
imageLoader.init(config);
final ProgressBar pImgDialog = (ProgressBar)view.findViewById(R.id.pbImage);
imageLoader.displayImage(strURL, imgView, options, new ImageLoadingListener() {
@Override
public void onLoadingStarted(String imageUri, View view) {
pImgDialog.setVisibility(View.VISIBLE);
imgView.setVisibility(View.GONE);
}
@Override
public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
pImgDialog.setVisibility(View.GONE);
imgView.setVisibility(View.VISIBLE);
}
@Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
pImgDialog.setVisibility(View.GONE);
imgView.setVisibility(View.VISIBLE);
}
@Override
public void onLoadingCancelled(String imageUri, View view) {
pImgDialog.setVisibility(View.GONE);
imgView.setVisibility(View.VISIBLE);
}
});
view.setTag(item.catalog_id);
return view;
}
由于您的适配器中有自己的ArrayList，因此您也必须更新此适配器。只需将此方法添加到您的BasketAdapter：
public void changeModelList(List<CatalogItem> models) {
this.data = models;
notifyDataSetChanged();
}
并使用它代替notifyDataSetChanged()。
它没有经过测试，但我认为这是你的问题。