Question

我想创建一个快速滚动的联系人列表。在右边我需要放置字母列表“ABCD ... Z”。在屏幕上，我需要弹出A或B ...每次我点击右侧列表或向上和向下滚动。

在我的代码中：我有两个问题：首先，当我向下滚动列表a时，字母列表图像消失其次，如果我在列表中间单击，屏幕上不会出现任何内容。我的意思是我需要将我的取景器放在滚动按钮上，以便在浏览列表时查看下方列表字符。当滚动显示时我不想要那个按钮，我也希望它在我放置取景器的地方激活。

有什么建议吗？

的.java

            class MyIndexerAdapter<T> extends ArrayAdapter<T> implements SectionIndexer {

                    ArrayList<String> myElements;
                    HashMap<String, Integer> alphaIndexer;

                    String[] sections;

                    public MyIndexerAdapter(Context context, int textViewResourceId,
                                    List<T> objects) {


                            super(context, textViewResourceId, objects);
                            myElements = (ArrayList<String>) objects;
                            // here is the tricky stuff
                            alphaIndexer = new HashMap<String, Integer>();
                            // in this hashmap we will store here the positions for
                            // the sections

                            int size = elements.size();
                            for (int i = size - 1; i >= 0; i--) {
                                    String element = elements.get(i);
                                    alphaIndexer.put(element.substring(0, 1), i);
                            //We store the first letter of the word, and its index.
                            //The Hashmap will replace the value for identical keys are putted in
                            }


                            Set<String> keys = alphaIndexer.keySet(); // set of letters ...sets       
                            Iterator<String> it = keys.iterator();
                            ArrayList<String> keyList = new ArrayList<String>(); // list can be
                            // sorted

                            while (it.hasNext()) {
                                    String key = it.next();
                                    keyList.add(key);
                            }

                            Collections.sort(keyList);

                            sections = new String[keyList.size()]; // simple conversion to an
                            // array of object
                            keyList.toArray(sections);


                    }


                    public int getPositionForSection(int section) {
                            // Log.v("getPositionForSection", ""+section);
                            String letter = sections[section];

                            return alphaIndexer.get(letter);
                    }

                    public int getSectionForPosition(int position) {

                            // you will notice it will be never called (right?)
                            Log.v("getSectionForPosition", "called");
                            return 0;
                    }

                    public Object[] getSections() {

                            return sections; // to string will be called each object, to display                        }

            }
    }

快速滚动列表 - 右侧字母列表的问题

0 个答案: