我的Activity中有一个带有自定义适配器的ListView。
每个项目都有一个删除按钮。当有人点击该按钮时，会弹出一个对话框，询问用户是否确实要删除该项目，点击“是”后，该项目将被删除。
我在内部验证了正确的项目被删除，但在视觉上只删除了列表中的最后一项。 Activity.recreate显示正确的项目已被删除，但我不想在简单的删除和notifyDataSetChanged（）可以解决问题时调用recreate。
有人能指出我的代码可能出错的正确方向吗？
我的活动中的源代码是：
ListView mylistview = (ListView) findViewById(R.id.listFriends);
SS4ListItemFriendsAdapter adapter = new SS4ListItemFriendsAdapter(getApplicationContext(), SS4NewGameActivity.this, SS4ListItemFriendsRows);
mylistview.setAdapter(adapter);
这是我的适配器：
public class SS4ListItemFriendsAdapter extends BaseAdapter {
Context context;
List<SS4ListItemFriendsRow> rowItems;
private Activity activity;
SS4ListItemFriendsAdapter(Context context, Activity act, List<SS4ListItemFriendsRow> rowItems) {
this.context = context;
this.rowItems = rowItems;
this.activity = act;
}
@Override
public int getCount() {
return rowItems.size();
}
@Override
public Object getItem(int position) {
return rowItems.get(position);
}
@Override
public long getItemId(int position) {
return rowItems.indexOf(getItem(position));
}
/* private view holder class */
private class ViewHolder {
ImageView avatar;
ImageView delete;
TextView username;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
LayoutInflater mInflater = (LayoutInflater) context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.ss4_list_item_friends, null);
holder = new ViewHolder();
holder.username = (TextView) convertView
.findViewById(R.id.username);
holder.avatar = (ImageView) convertView
.findViewById(R.id.avatar);
holder.delete = (ImageView) convertView
.findViewById(R.id.delete);
if (getCount() > 0) {
if (((SS4ListItemFriendsRow) getItem(0)).getDelete() == 0) {
holder.delete.setVisibility(ImageView.INVISIBLE);
}
}
final SS4ListItemFriendsRow row_pos = rowItems.get(position);
holder.avatar.setImageResource(row_pos.getAvatar());
holder.username.setText(row_pos.getUsername());
holder.delete.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Sounds.buttonClick();
Log.d(App.TAG, row_pos.getUsername());
deleteFriendDialogBox(row_pos.getUsername(), position);
}
});
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
return convertView;
}
private void deleteFriendDialogBox(final String username, final int position)
{
//String title = "deleteFriend?";
String msg = context.getResources().getString(R.string.ss4_delete_friend);
AlertDialog myQuittingDialogBox = new AlertDialog.Builder(activity)
.setCancelable(false)
.setTitle("")
.setMessage(msg)
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
rowItems.remove(position);
Log.d(App.TAG,"position: "+String.valueOf(position));
notifyDataSetChanged();
SS4NewGameActivity.getListViewSize(mylistview);
//activity.recreate();
try {
int showMsgBox = (Integer) friend.getInt("showMsgBox");
if (showMsgBox == 1) {
String msg = (String) friend.getString("msg");
Toast.makeText(context, msg,Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Sounds.buttonClick();
}
})//setPositiveButton
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
Sounds.buttonClick();
}
})//setNegativeButton
.create();
myQuittingDialogBox.show();
}
}
答案 0 :(得分：3)
更新代码： - 对象上的所有设置都需要在外面..检查更新的代码。
public class SS4ListItemFriendsAdapter extends BaseAdapter {
Context context;
List<SS4ListItemFriendsRow> rowItems;
private Activity activity;
SS4ListItemFriendsAdapter(Context context, Activity act, List<SS4ListItemFriendsRow> rowItems) {
this.context = context;
this.rowItems = rowItems;
this.activity = act;
}
@Override
public int getCount() {
return rowItems.size();
}
@Override
public Object getItem(int position) {
return rowItems.get(position);
}
@Override
public long getItemId(int position) {
return rowItems.indexOf(getItem(position));
}
/* private view holder class */
private class ViewHolder {
ImageView avatar;
ImageView delete;
TextView username;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
LayoutInflater mInflater = (LayoutInflater) context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.ss4_list_item_friends, null);
holder = new ViewHolder();
holder.username = (TextView) convertView
.findViewById(R.id.username);
holder.avatar = (ImageView) convertView
.findViewById(R.id.avatar);
holder.delete = (ImageView) convertView
.findViewById(R.id.delete);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
if (getCount() > 0) {
if (((SS4ListItemFriendsRow) getItem(0)).getDelete() == 0) {
holder.delete.setVisibility(ImageView.INVISIBLE);
}
}
final SS4ListItemFriendsRow row_pos = rowItems.get(position);
holder.avatar.setImageResource(row_pos.getAvatar());
holder.username.setText(row_pos.getUsername());
holder.delete.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Sounds.buttonClick();
Log.d(App.TAG, row_pos.getUsername());
deleteFriendDialogBox(row_pos.getUsername(), position);
}
});
return convertView;
}
private void deleteFriendDialogBox(final String username, final int position)
{
//String title = "deleteFriend?";
String msg = context.getResources().getString(R.string.ss4_delete_friend);
AlertDialog myQuittingDialogBox = new AlertDialog.Builder(activity)
.setCancelable(false)
.setTitle("")
.setMessage(msg)
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
rowItems.remove(position);
Log.d(App.TAG,"position: "+String.valueOf(position));
notifyDataSetChanged();
SS4NewGameActivity.getListViewSize(mylistview);
//activity.recreate();
try {
int showMsgBox = (Integer) friend.getInt("showMsgBox");
if (showMsgBox == 1) {
String msg = (String) friend.getString("msg");
Toast.makeText(context, msg,Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Sounds.buttonClick();
}
})//setPositiveButton
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
Sounds.buttonClick();
}
})//setNegativeButton
.create();
myQuittingDialogBox.show();
}
}
答案 1 :(得分：0)
在调用notifyDatasetChange（）
后再次加载适配器