ListView長按彈出對話方塊可以用PopupWindow實現
今天記錄的是重寫onCreateContextMenu和onContextItemSelected實現彈出對話方塊，比前者簡單很多

上圖

1 . 繫結ListView

registerForContextMenu(mUserList);

2 . 在onCreateContextMenu裡面新增標題和Item

@Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        super.onCreateContextMenu
 
(menu, v, menuInfo);
        AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo;
        String user = idToEmail(info.id);
        menu.setHeaderTitle(user);
        menu.add(0, REMOVE_ID, 0, R.string.context_menu_remove_account);
    }

3 . 在onContextItemSelected方法裡面進行處理

@Override
    public boolean onContextItemSelected(MenuItem item) {
        AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
        final String user = idToEmail(info.id); // final so listener can see value
        switch (item.getItemId()) {
            case
 
 REMOVE_ID:
                AccountDb.getInstance().delete(user);
                refreshUserList(true);
                return true;
            default:
                return super.onContextItemSelected(item);
        }
    }