Android(安卓)SearchView介绍及搜索提示实现

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1. layout文件

Java

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<? xml version = "1.0" encoding = "utf-8" ?> < RelativeLayout xmlns : android = "http://schemas.android.com/apk/res/android" android : layout_width = "match_parent" android : layout_height = "match_parent" > < SearchView android : id = "@+id/search_view" android : layout_width = "match_parent" android : layout_height = "match_parent" android : iconifiedByDefault = "true" android : inputType = "textCapWords" android : imeOptions = "actionSearch" android : queryHint = "" / > < / RelativeLayout >

xml中主要配置有四个属性，如下：

android:iconifiedByDefault表示搜索图标是否在输入框内。true效果更加
android:imeOptions设置IME options，即输入法的回车键的功能，可以是搜索、下一个、发送、完成等等。这里actionSearch表示搜索
android:inputType输入框文本类型，可控制输入法键盘样式，如numberPassword即为数字密码样式
android:queryHint输入框默认文本

2. java部分代码
SearchView几个主要函数
setOnCloseListener(SearchView.OnCloseListener listener)表示点击取消按钮listener，默认点击搜索输入框
setOnQueryTextListener(SearchView.OnQueryTextListener listener)表示输入框文字listener，包括public boolean onQueryTextSubmit(String query)开始搜索listener，public boolean onQueryTextChange(String newText)输入框内容变化listener，两个函数，下面代码包含了如何利用延迟执行实现搜索提示

Java部分实现 Java

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package cn . trinea . android . demo ; import java . util . concurrent . Executors ; import java . util . concurrent . ScheduledExecutorService ; import java . util . concurrent . ScheduledFuture ; import java . util . concurrent . TimeUnit ; import android . app . ActionBar ; import android . app . ActionBar . LayoutParams ; import android . app . Activity ; import android . content . Context ; import android . os . Bundle ; import android . os . Handler ; import android . os . Message ; import android . view . Gravity ; import android . view . LayoutInflater ; import android . view . MenuItem ; import android . view . View ; import android . view . WindowManager ; import android . widget . SearchView ; import android . widget . SearchView . OnCloseListener ; import android . widget . Toast ; public class SearchViewDemo extends Activity { private SearchView searchView ; private Context context ; private MyHandler handler ; // schedule executor private ScheduledExecutorService scheduledExecutor = Executors . newScheduledThreadPool ( 10 ) ; private String currentSearchTip ; @Override protected void onCreate ( Bundle savedInstanceState ) { super . onCreate ( savedInstanceState ) ; setContentView ( R . layout . search_view_demo ) ; context = getApplicationContext ( ) ; handler = new MyHandler ( ) ; ActionBar actionBar = getActionBar ( ) ; actionBar . setDisplayOptions ( ActionBar . DISPLAY_SHOW_TITLE | ActionBar . DISPLAY_HOME_AS_UP | ActionBar . DISPLAY_SHOW_CUSTOM ) ; setTitle ( " " ) ; LayoutInflater inflater = ( LayoutInflater ) getSystemService ( Context . LAYOUT_INFLATER_SERVICE ) ; View customActionBarView = inflater . inflate ( R . layout . search_view_demo_title , null ) ; searchView = ( SearchView ) customActionBarView . findViewById ( R . id . search_view ) ; searchView . setIconified ( false ) ; searchView . setOnCloseListener ( new OnCloseListener ( ) { @Override public boolean onClose ( ) { // to avoid click x button and the edittext hidden return true ; } } ) ; searchView . setOnQueryTextListener ( new SearchView . OnQueryTextListener ( ) { public boolean onQueryTextSubmit ( String query ) { Toast . makeText ( context , "begin search" , Toast . LENGTH_SHORT ) . show ( ) ; return true ; } public boolean onQueryTextChange ( String newText ) { if ( newText != null && newText . length ( ) > 0 ) { currentSearchTip = newText ; showSearchTip ( newText ) ; } return true ; } } ) ; LayoutParams params = new LayoutParams ( LayoutParams . WRAP_CONTENT , LayoutParams . WRAP_CONTENT , Gravity . CENTER_VERTICAL | Gravity . RIGHT ) ; actionBar . setCustomView ( customActionBarView , params ) ; // show keyboard getWindow ( ) . setSoftInputMode ( WindowManager . LayoutParams . SOFT_INPUT_ADJUST_RESIZE | WindowManager . LayoutParams . SOFT_INPUT_STATE_VISIBLE ) ; } public void showSearchTip ( String newText ) { // excute after 500ms, and when excute, judge current search tip and newText schedule ( new SearchTipThread ( newText ) , 500 ) ; } class SearchTipThread implements Runnable { String newText ; public SearchTipThread ( String newText ) { this . newText = newText ; } public void run ( ) { // keep only one thread to load current search tip, u can get data from network here if ( newText != null && newText . equals ( currentSearchTip ) ) { handler . sendMessage ( handler . obtainMessage ( 1 , newText + " search tip" ) ) ; } } } public ScheduledFuture < ? > schedule ( Runnable command , long delayTimeMills ) { return scheduledExecutor . schedule ( command , delayTimeMills , TimeUnit . MILLISECONDS ) ; } @Override public boolean onOptionsItemSelected ( MenuItem item ) { switch ( item . getItemId ( ) ) { case android . R . id . home : { onBackPressed ( ) ; return true ; } } return false ; } private class MyHandler extends Handler { @Override public void handleMessage ( Message msg ) { switch ( msg . what ) { case 1 : Toast . makeText ( context , ( String ) msg . obj , Toast . LENGTH_SHORT ) . show ( ) ; break ; } } } }

上面代码在onQueryTextChange函数即输入框内容每次变化时将一个数据获取线程SearchTipThread放到ScheduledExecutorService中，500ms后执行，在线程执行时判断当前输入框内容和要搜索内容，若相等则继续执行，否则直接返回，避免不必要的数据获取和多个搜索提示同时出现。

getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE
| WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
表示默认输入法弹出

编辑框内容为空点击取消的x按钮，编辑框收缩，可在onClose中返回true

Java

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searchView . setOnCloseListener ( new OnCloseListener ( ) { @Override public boolean onClose ( ) { return true ; } } ) ;

searchView.onActionViewExpanded();表示在内容为空时不显示取消的x按钮，内容不为空时显示.

searchView.setSubmitButtonEnabled(true);编辑框后显示search按钮，个人建议用android:imeOptions=”actionSearch”代替。

隐藏输入法键盘

Java

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InputMethodManager inputMethodManager ; inputMethodManager = ( InputMethodManager ) getSystemService ( Context . INPUT_METHOD_SERVICE ) ; private void hideSoftInput ( ) { if ( inputMethodManager != null ) { View v = SearchActivity . this . getCurrentFocus ( ) ; if ( v == null ) { return ; } inputMethodManager . hideSoftInputFromWindow ( v . getWindowToken ( ) , InputMethodManager . HIDE_NOT_ALWAYS ) ; searchView . clearFocus ( ) ; } }

其中SearchActivity为Activity的类名

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