edittext + listview 实现搜索listview中的内容方法(推荐)

时间:2022-10-14 16:50:50       来源:互联网


(资料图片仅供参考)

主要原理:是在主界面有两个空间,一个是EditText,一个是ListView,ListView是放在EditText下面的,然后自定义建立一个adapter适配器,

这个适配器要继承Filterable这个接口,并实现这个接口的两个方法,一个是过滤方法,一个是过滤后的方法,一般我们是在过滤方法里面实现过滤,

在过滤后的方法里面调用notifyDataSetChanged();也就是使适配器更新数据,这里还有用到一个pinyin4j-2.5.0.jar的架包,这个主要是汉字转拼

音的功能

MainActivity.Java

public class MainActivity extends Activity {  private EditText et_filter;  private UserAdapter adapter;  private ListView lv_list;   @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.activity_main);   List<UserInfo> userInfos = new ArrayList<UserInfo>();   for (int i = 0; i < 2; i++) {    UserInfo user = new UserInfo();    user.setUsername("张三" + i);    user.setPhonenum("12345" + i);    userInfos.add(user);   }   for (int i = 0; i < 2; i++) {    UserInfo user = new UserInfo();    user.setUsername("李四" + i);    user.setPhonenum("12345" + i);    userInfos.add(user);   }      lv_list = (ListView) findViewById(R.id.lv_list);   adapter = new UserAdapter(MainActivity.this, userInfos);   lv_list.setAdapter(adapter);      et_filter = (EditText) findViewById(R.id.et_filter);   et_filter.addTextChangedListener(new TextWatcher() {     @Override    public void onTextChanged(CharSequence s, int start, int before,      int count) {     adapter.getFilter().filter(et_filter.getText().toString());     }     @Override    public void beforeTextChanged(CharSequence s, int start, int count,      int after) {         }     @Override    public void afterTextChanged(Editable s) {     }   });   } } 

UserAdapter.java

package com.example.edittextfilterdemo; import java.util.ArrayList; import java.util.List; import android.content.Context; import android.util.Log; 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; /**  * 自定义具有过滤功能的adapter类  *  */ public class UserAdapter extends BaseAdapter implements Filterable {  private MyFilter myFilter;  private List<UserInfo> userInfos;  private Context context;  private ArrayList<UserInfo> mOriginalValues;    private final Object mLock = new Object();    public UserAdapter(Context context, List<UserInfo> userInfos) {    this.context = context;    this.userInfos = userInfos;    }    @Override   public int getCount() {    // TODO Auto-generated method stub    return userInfos.size();   }    @Override   public Object getItem(int arg0) {    // TODO Auto-generated method stub    return userInfos.get(arg0);   }    @Override   public long getItemId(int position) {    // TODO Auto-generated method stub    return position;   }    @Override   public View getView(int position, View convertView, ViewGroup parent) {     View view = convertView;     ViewHolder holder;    if (view == null) {     view = LayoutInflater.from(context).inflate(R.layout.list_item,      null);     holder = new ViewHolder();      holder.tv_nick = (TextView) view.findViewById(R.id.tv_nick);     holder.tv_mobile = (TextView) view.findViewById(R.id.tv_mobile);     view.setTag(holder);    } else {     holder = (ViewHolder) view.getTag();    }     holder.tv_nick.setText(userInfos.get(position).getUsername());    holder.tv_mobile.setText(userInfos.get(position).getPhonenum());     return view;   }    static class ViewHolder {     TextView tv_nick;    TextView tv_mobile;   }    @Override   public Filter getFilter() {    if (myFilter == null) {     myFilter = new MyFilter();    }    return myFilter;   }    class MyFilter extends Filter {     @Override    protected FilterResults performFiltering(CharSequence prefix) {     // 持有过滤操作完成之后的数据。该数据包括过滤操作之后的数据的值以及数量。 count:数量 values包含过滤操作之后的数据的值     FilterResults results = new FilterResults();      if (mOriginalValues == null) {     synchronized (mLock) {      // 将list的用户 集合转换给这个原始数据的ArrayList      mOriginalValues = new ArrayList<UserInfo>(userInfos);     }     }     if (prefix == null || prefix.length() == 0) {     synchronized (mLock) {      ArrayList<UserInfo> list = new ArrayList<UserInfo>(        mOriginalValues);      results.values = list;      results.count = list.size();     }     } else {     // 做正式的筛选     String prefixString = prefix.toString().toLowerCase();      // 声明一个临时的集合对象 将原始数据赋给这个临时变量     final ArrayList<UserInfo> values = mOriginalValues;      final int count = values.size();      // 新的集合对象     final ArrayList<UserInfo> newValues = new ArrayList<UserInfo>(       count);      for (int i = 0; i < count; i++) {      // 如果姓名的前缀相符或者电话相符就添加到新的集合      final UserInfo value = (UserInfo) values.get(i);      Log.i("coder", "PinyinUtils.getAlpha(value.getUsername())"        + PinyinUtils.getFirstSpell(value.getUsername()));            if (PinyinUtils.getFirstSpell(value.getUsername()).startsWith(        prefixString)        || value.getPhonenum().startsWith(prefixString)||value.getUsername().startsWith(prefixString)) {        newValues.add(value);      }     }     // 然后将这个新的集合数据赋给FilterResults对象     results.values = newValues;     results.count = newValues.size();     }      return results;    }     @Override    protected void publishResults(CharSequence constraint,     FilterResults results) {     // 重新将与适配器相关联的List重赋值一下     userInfos = (List<UserInfo>) results.values;      if (results.count > 0) {     notifyDataSetChanged();     } else {     notifyDataSetInvalidated();     }    }    }  } 

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.example.edittextfilterdemo.MainActivity" >   <EditText   android:id="@+id/et_filter"   android:layout_width="match_parent"   android:layout_height="wrap_content" />   <ListView   android:id="@+id/lv_list"   android:layout_width="match_parent"   android:layout_height="wrap_content" >  </ListView>  </LinearLayout> 

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关键词: edittext搜索listview