AutoCompleteTextView 自动提示

来源：互联网发布：python 计算 macd 编辑：程序博客网时间：2024/05/16 12:27

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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