我们使用控件AutoCompleteTextView 自动提示时，有时需要设置BaseAdapter，设置BaseAdapter时，需要实现Filterable，手动进行筛选。

常用属性

布局只设置了至少输入一个字符显示提示

<AutoCompleteTextView android:id="@+id/at" android:completionThreshold="1" android:layout_width="match_parent" android:layout_height="wrap_content" /> private List<String> allData = new ArrayList<>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); allData.add("aa"); allData.add("bb"); allData.add("cc"); allData.add("dd"); allData.add("abc"); allData.add("bcd"); AutoCompleteTextView textView = (AutoCompleteTextView) findViewById(R.id.at); MyAdapter adapter = new MyAdapter(); textView.setAdapter(adapter); }

adapter适配器代码

class MyAdapter extends BaseAdapter implements Filterable { DataFilter filter; ArrayList<String> data; @Override public int getCount() { if (data != null && data.size() > 0) { return data.size(); } return 0; } @Override public Object getItem(int i) { return null; } @Override public long getItemId(int i) { return 0; } @Override public View getView(int position, View view, ViewGroup viewGroup) { TextView textView = new TextView(MainActivity.this); textView.setText(data.get(position)); return textView; } @Override public Filter getFilter() { if (filter == null) { filter = new DataFilter(); } return filter; } private class DataFilter extends Filter { @Override protected FilterResults performFiltering(CharSequence prefix) { //查询结果保存到FilterResults对象里 FilterResults results = new FilterResults(); List<String> queryData = new ArrayList<>(); for (int i = 0; i < allData.size(); i++) { if (allData.get(i).contains(prefix.toString())) { queryData.add(allData.get(i)); } } results.values = queryData; results.count = queryData.size(); return results; } /** * 更新UI */ @Override protected void publishResults(CharSequence constraint, FilterResults results) { List<String> queryData = (List<String>) results.values; if (data == null) { data = new ArrayList<>(); } if (data.size() > 0) { data.clear(); } if (queryData != null && queryData.size() > 0) for (String string : queryData) { data.add(string); notifyDataSetChanged(); } } } }

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