AutoCompleteTextView 这个东西做Android的应该都看过~没看过的去百度下吧,我就不多说了,问题是它怎么能自动补全的呢?
这个是因为它setAdapter(adapter);,没错,你没看错,就是因为它设置了一个adapter。。。而它的过滤原则也是根据这个adapter中的Filter来的。
一般网上的那些例子里面都是设置的一个ArrayAdapter,这个adapter里面的Filter看源码就能看出来是怎么过滤的:
public Filter getFilter() { if (mFilter == null) { mFilter = new ArrayFilter(); } return mFilter; } /** * <p>An array filter constrains the content of the array adapter with * a prefix. Each item that does not start with the supplied prefix * is removed from the list.</p> */ private class ArrayFilter extends Filter { @Override protected FilterResults performFiltering(CharSequence prefix) { FilterResults results = new FilterResults(); if (mOriginalValues == null) { synchronized (mLock) { mOriginalValues = new ArrayList<T>(mObjects); } } if (prefix == null || prefix.length() == 0) { ArrayList<T> list; synchronized (mLock) { list = new ArrayList<T>(mOriginalValues); } results.values = list; results.count = list.size(); } else { String prefixString = prefix.toString().toLowerCase(); ArrayList<T> values; synchronized (mLock) { values = new ArrayList<T>(mOriginalValues); } final int count = values.size(); final ArrayList<T> newValues = new ArrayList<T>(); for (int i = 0; i < count; i++) { final T value = values.get(i); final String valueText = value.toString().toLowerCase(); // First match against the whole, non-splitted value if (valueText.startsWith(prefixString)) {//看到没有~这就是匹配原则。。。就是这么蛋疼,就是这么酸爽 newValues.add(value); } else { final String[] words = valueText.split(" "); final int wordCount = words.length; // Start at index 0, in case valueText starts with space(s) for (int k = 0; k < wordCount; k++) { if (words[k].startsWith(prefixString)) { newValues.add(value); break; } } } } results.values = newValues; results.count = newValues.size(); } return results; } @Override protected void publishResults(CharSequence constraint, FilterResults results) { //noinspection unchecked mObjects = (List<T>) results.values; if (results.count > 0) { notifyDataSetChanged(); } else { notifyDataSetInvalidated(); } } }
所以,我的做法就是,直接复制整个ArrayAdapter类,然后将里面的那句原则改掉,改成 valueText.contains(prefixString) ,这样在设置的时候设自定义的这个类,然后,然后就能看到全局匹配的AutoCompleteTextView了。