如果对这个效果感觉不错, 请往下看.
背景: 天气预报app, 本地数据库存储70个大中城市的基本信息, 根据用户输入的或通过搜索框选取的城市, 点击查询按钮后, 异步请求国家气象局数据, 得到返回的json解析并显示.
1. 先说AndroidManifest.xml文件
<uses-sdkandroid:minSdkVersion="11"android:targetSdkVersion="16"/><application><activityandroid:name="com.lichen.weather.WeatherActivity"android:launchMode="singleTop"android:label="@string/app_name"><intent-filter><!--省略--></intent-filter><!-- 关注1 --><!--Receivesthesearchrequest.--><intent-filter><actionandroid:name="android.intent.action.SEARCH"/><!--Nocategoryneeded,becausetheIntentwillspecifythisclasscomponent--></intent-filter><!--Pointstosearchablemetadata.--><meta-dataandroid:name="android.app.searchable"android:resource="@xml/searchable"/><!-- /关注1 --></activity><providerandroid:name="com.lichen.db.CityContentProvider"android:authorities="com.lichen.cityprovider"android:label="@string/app_name"></provider><!-- 关注2 --><!--Pointstosearchableactivitysothewholeappcaninvokesearch.--><meta-dataandroid:name="android.app.default_searchable"android:value="com.lichen.weather.WeatherActivity"/><!-- /关注2 --></application>
2. menu菜单里面加入
<menuxmlns:android="/apk/res/android"><itemandroid:id="@+id/search"android:title="@string/menu_search"android:showAsAction="collapseActionView|ifRoom"android:actionViewClass="android.widget.SearchView"/></menu>
3. 然后在res目录下新建xml/searchable.xml
<?xmlversion="1.0"encoding="utf-8"?> <searchablexmlns:android="/apk/res/android"android:label="@string/search_label"android:hint="@string/search_hint"android:searchSuggestAuthority="com.lichen.cityprovider"android:searchSuggestIntentAction="android.intent.action.VIEW"android:searchSuggestIntentData="content://com.lichen.cityprovider/city"android:searchSuggestSelection="?"android:searchSuggestThreshold="1"android:includeInGlobalSearch="true"></searchable>
字符串尽量使用@string/search_label这种方式.
4. Activity中
因为注册Activity的启动方式为android:launchMode="singleTop",需要Activity的protectedvoidonNewIntent(Intentintent){}来交互.
@OverrideprotectedvoidonNewIntent(Intentintent){handleIntent(intent);}privatevoidhandleIntent(Intentintent){if(Intent.ACTION_VIEW.equals(intent.getAction())){//查询数据库CursorsearchCursor=getContentResolver().query(intent.getData(),null,null,null,null);if(searchCursor!=null&&searchCursor.moveToFirst()){cityInput.setText(searchCursor.getString(searchCursor.getColumnIndex(City.CITY_DESCRIBE)));}}@OverridepublicbooleanonCreateOptionsMenu(Menumenu){getMenuInflater().inflate(R.menu.activity_weather,menu);SearchManagersearchManager=(SearchManager)getSystemService(Context.SEARCH_SERVICE);SearchViewsearchView=(SearchView)menu.findItem(R.id.search).getActionView();searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));searchView.setIconifiedByDefault(false);returntrue;}
以上的在网上可以搜索到,接下来是重点...
5. 需要数据库支持
publicclassCityDatabaseHelperextendsSQLiteOpenHelper{protectedstaticfinalStringDATABASE_NAME="city.db";protectedstaticfinalintDATABASE_VERSION=6;publicString[]columns=newString[]{SearchManager.SUGGEST_COLUMN_TEXT_1,SearchManager.SUGGEST_COLUMN_TEXT_2,SearchManager.SUGGEST_COLUMN_ICON_1,SearchManager.SUGGEST_COLUMN_ICON_2,BaseColumns._ID,SearchManager.SUGGEST_COLUMN_INTENT_DATA_ID};privatestaticfinalHashMap<String,String>mColumnMap=buildColumnMap();publicCityDatabaseHelper(Contextcontext){super(context,DATABASE_NAME,null,DATABASE_VERSION);}privatestaticHashMap<String,String>buildColumnMap(){HashMap<String,String>map=newHashMap<String,String>();map.put(SearchManager.SUGGEST_COLUMN_TEXT_1,City.CITY_DESCRIBE+"as"+SearchManager.SUGGEST_COLUMN_TEXT_1);map.put(SearchManager.SUGGEST_COLUMN_TEXT_2,City.CITY_NICKNAME+"as"+SearchManager.SUGGEST_COLUMN_TEXT_2);map.put(SearchManager.SUGGEST_COLUMN_ICON_1,City.CITY_IMG+"as"+SearchManager.SUGGEST_COLUMN_ICON_1);map.put(SearchManager.SUGGEST_COLUMN_ICON_2,City.CITY_IMG_2+"as"+SearchManager.SUGGEST_COLUMN_ICON_2);map.put(BaseColumns._ID,"rowidAS"+BaseColumns._ID);map.put(SearchManager.SUGGEST_COLUMN_INTENT_DATA_ID,"rowidAS"+SearchManager.SUGGEST_COLUMN_INTENT_DATA_ID);returnmap;}@OverridepublicvoidonCreate(SQLiteDatabasedb){db.execSQL("createtable"+City.TABLE_NAME+"(_idintegerprimarykeyautoincrement,city_idinteger,city_nametext,city_nicknametext,city_describetext,city_imgtext,city_img_2text)");}@OverridepublicvoidonUpgrade(SQLiteDatabasedb,intoldVersion,intnewVersion){db.execSQL("droptableifexists"+City.TABLE_NAME);onCreate(db);}/***用于ContentProvider调用,使用like的模糊查询*/publicCursorsearch(StringkeyWord){SQLiteQueryBuilderbuilder=newSQLiteQueryBuilder();builder.setTables(City.TABLE_NAME);builder.setProjectionMap(mColumnMap);SQLiteDatabasedb=getReadableDatabase();returnbuilder.query(db,columns,City.CITY_NAME+"like?"+"or"+City.CITY_NICKNAME+"like?",newString[]{"%"+keyWord+"%","%"+keyWord+"%"},null,null,null);}}
6. 完成searchable.xml里面注册的ContentProvider
publicclassCityContentProviderextendsContentProvider{publicstaticfinalStringAUTHORITY="com.lichen.cityprovider";privateSQLiteDatabasedb;privateCityDatabaseHelperdbHelper;privatestaticfinalintQUERY_NORMAL=1;privatestaticfinalintQUERY_BY_ID=2;privatestaticfinalintQUERY_SEARCH_CITY_NAME=3;publicstaticUriMatcheruriMatcher;static{uriMatcher=newUriMatcher(UriMatcher.NO_MATCH);uriMatcher.addURI(AUTHORITY,"city",QUERY_NORMAL);uriMatcher.addURI(AUTHORITY,"city/#",QUERY_BY_ID);uriMatcher.addURI(AUTHORITY,SearchManager.SUGGEST_URI_PATH_QUERY,QUERY_SEARCH_CITY_NAME);uriMatcher.addURI(AUTHORITY,SearchManager.SUGGEST_URI_PATH_QUERY+"/*",QUERY_SEARCH_CITY_NAME);}@OverridepublicbooleanonCreate(){dbHelper=newCityDatabaseHelper(getContext());returndbHelper!=null;}@OverridepublicCursorquery(Uriuri,String[]projection,Stringselection,String[]selectionArgs,StringsortOrder){db=dbHelper.getReadableDatabase();switch(uriMatcher.match(uri)){caseQUERY_SEARCH_CITY_NAME:returndbHelper.search(selectionArgs[0]);default:thrownewIllegalArgumentException("UnknownUri:"+uri);}}}
like模糊查询对于大数据量效果可想而知,FTS3的支持还未尝试,详情参考Android SDK里面的Samples/SearchableDictionary
本文转自chainli 51CTO博客，原文链接：/lichen/1192652，如需转载请自行联系原作者
