android开发--searchView

来源：互联网发布：钻石皇朝流量软件编辑：程序博客网时间：2024/05/22 16:56

研究下searchview,使用searchview在中主布局中,不是在actionbar上,实现搜索提示功能
效果如下:
这里写图片描述

主布局文件activity_main.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.min.mysearchview.MainActivity" >    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="搜索" >    </TextView>    <SearchView        android:id="@+id/sv"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:focusable="true"        android:queryHint="请输入关键字"        android:background="#fff"        android:iconifiedByDefault="false"        android:imeOptions="actionSearch"        android:inputType="textFilter" >    </SearchView>    <ListView        android:layout_marginTop="20dp"        android:id="@+id/lv"        android:divider="@null"        android:dividerHeight="10dp"        android:layout_width="match_parent"        android:layout_height="match_parent"         >    </ListView></LinearLayout>

很简单,一个textview来显示标题,一个searchview写入搜索字符串,一个listview来显示提示内容

要想将包含输入的字符的所有项都显示出来,而不仅仅匹配了首字母,需要自定义adapter并实现filerable接口:

package com.min.mysearchview;import java.util.ArrayList;import java.util.List;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Filter;import android.widget.Filterable;import android.widget.TextView;public class MySearchAdapter extends BaseAdapter implements Filterable {    private List<String> lists;    private LayoutInflater mLayoutInflater;    public MySearchAdapter(List<String> lists, Context context) {        this.lists = lists;        mLayoutInflater = LayoutInflater.from(context);    }    @Override    public int getCount() {        return lists.size();    }    @Override    public Object getItem(int position) {        return lists.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        ViewHolder holder = null;        if (convertView == null) {            holder = new ViewHolder();            convertView = mLayoutInflater.inflate(                    R.layout.adapter_mysearchadapter, null);            holder.tv_adapter = (TextView) convertView                    .findViewById(R.id.tv_adapter);            convertView.setTag(holder);        } else {            // 将设置好的布局保存到缓存中，并将其设置在Tag里，以便后面方便取出Tag            holder = (ViewHolder) convertView.getTag();        }        holder.tv_adapter.setText((String) lists.get(position).toString());        return convertView;    }    // ViewHolder静态类    static class ViewHolder {        public TextView tv_adapter;    }    // 上面部分是对baseadapter的方法重写    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~    // 继承Filterable接口就需要重写下面方法    @Override    // 返回自定义的filter    public Filter getFilter() {        return new ArrayFilter(lists);    }    // myFilter    public class ArrayFilter extends Filter {        private List<String> filterlists;        public ArrayFilter(List<String> filterlists) {            this.filterlists = filterlists;        }        // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~        // 对字符串的匹配,这里采取了关键字匹配,不是字符串开头匹配        @Override        // 参数是输入框输入的字符串        protected FilterResults performFiltering(CharSequence constraint) {            // 首先取得FilterResults对象            FilterResults results = new FilterResults();            // 判断,如果输入框输入的字符串为空,那么不错处理,listview中的字符集全部返回,返回对象为FilterResults;            if (constraint == null || constraint.length() == 0) {                List<String> values = new ArrayList<String>();                results.values = values;                results.count = 0;            } else {                //先创建一个空字符集,用来存放返回字符集                List<String> newValues = new ArrayList<String>();                //为了不去分大小写匹配,故把匹配字段和listview的字符集都转换为小写来匹配                String lconstraint = constraint.toString().toLowerCase();                //用一个foreach循环,用输入字符串匹配listview的每个字符串                for (int i = 0; i < filterlists.size(); i++) {                    String str = filterlists.get(i).toLowerCase();                    //当匹配时,newValues添加相应字符串                    if (str.indexOf(lconstraint) != -1) {                        newValues.add(str);                    }                }                results.values = newValues;                results.count = newValues.size();            }            return results;        }        @Override        protected void publishResults(CharSequence constraint,                FilterResults results) {            //设置listview显示的字符集,并调用notifyDataSetChanged()方法,更新UI界面            lists = (List<String>) results.values;            notifyDataSetChanged();        }    }}

上面adapter中需要一个布局文件,很简单的做个textview,这里不上代码了

主函数实现:MainActivity.java:

package com.min.mysearchview;import java.util.ArrayList;import java.util.List;import android.R.integer;import android.app.Activity;import android.media.Image;import android.os.Bundle;import android.text.Html;import android.widget.Filter;import android.widget.Filterable;import android.widget.ImageView;import android.widget.ListView;import android.widget.SearchView;import android.widget.SearchView.OnQueryTextListener;import android.widget.Toast;public class MainActivity extends Activity {    //定义SearchView    private SearchView sv;    private ListView lv;    //定义过滤器    private Filter filter;    //自定义适配器    MySearchAdapter adapter;    //提示字符集    List<String> hins;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        lv = (ListView) findViewById(R.id.lv);        hins = new ArrayList<>();        hins.add("qq邮箱");        hins.add("qq空间");        hins.add("qq浏览器");        hins.add("qq邮箱");        hins.add("3q大战");        hins.add("大众点评");        hins.add("评论政客");        hins.add("论证之道");        hins.add("邮箱登录窗口");        //创建自定义的MySearchAdapter对象        adapter = new MySearchAdapter(hins, this);        //listview设置adapter        lv.setAdapter(adapter);        //listview设置不可见        lv.setVisibility(ListView.INVISIBLE);        sv = (SearchView) findViewById(R.id.sv);        //修改搜索图标        int search_logo_id=sv.getContext().getResources().getIdentifier("android:id/search_mag_icon", null, null);        ImageView search_logo=(ImageView) findViewById(search_logo_id);        //要替换的资源图标        search_logo.setImageResource(R.drawable.search2);        //需改queryHint字体的颜色        sv.setQueryHint(Html.fromHtml("<font color = #ff0000>" + "输入关键字" + "</font>"));        //获取过滤器         filter = ((Filterable) adapter).getFilter();        //事件监听,第一个是提交的监听,第二个为输入搜索框字改变的监听        sv.setOnQueryTextListener(new OnQueryTextListener() {            @Override            public boolean onQueryTextSubmit(String query) {                //简单来个toast,需要其他功能具体再实现                Toast.makeText(getApplicationContext(), query,                        Toast.LENGTH_LONG).show();                return false;            }            @Override            public boolean onQueryTextChange(String newText) {                //如果没有输入字,传递给过滤器的参数为null                if (newText == null || newText.length() == 0) {                    filter.filter(null);                } else {                    //先设置listview可见,传递输入的字符串作为参数给过滤器                    lv.setVisibility(ListView.VISIBLE);                    filter.filter(newText);                }                return true;            }        });    }}

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