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Android SearchView 搜索框

日期：2017/3/1 9:56:33 编辑：Linux編程

如果對這個效果感覺不錯, 請往下看.

背景: 天氣預報app, 本地數據庫存儲70個大中城市的基本信息, 根據用戶輸入的或通過搜索框選取的城市, 點擊查詢按鈕後, 異步請求國家氣象局數據, 得到返回的json解析並顯示.

1. 先說AndroidManifest.xml文件

<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="16"/>
<application>
<activity
android:name="com.lichen.weather.WeatherActivity"
android:launchMode="singleTop"
android:label="@string/app_name">
<intent-filter>
</intent-filter>
<intent-filter>
<actionandroid:name="android.intent.action.SEARCH"/>
</intent-filter>
<meta-dataandroid:name="android.app.searchable"
android:resource="@xml/searchable"/>
</activity>
<providerandroid:name="com.lichen.db.CityContentProvider"
android:authorities="com.lichen.cityprovider"
android:label="@string/app_name"></provider>
<meta-dataandroid:name="android.app.default_searchable"
android:value="com.lichen.weather.WeatherActivity"/>
</application>

2. menu菜單裡面加入

<menuxmlns:android="http://schemas.android.com/apk/res/android">
<itemandroid:id="@+id/search"
android:title="@string/menu_search"
android:showAsAction="collapseActionView|ifRoom"
android:actionViewClass="android.widget.SearchView"/>
</menu>

3. 然後在res目錄下新建xml/searchable.xml

<?xml version="1.0" encoding="utf-8"?>
<searchable xmlns:android="http://schemas.android.com/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>

字符串盡量使用@string/search_label這種方式.

4. Activity中

因為注冊Activity的啟動方式為android:launchMode="singleTop",需要Activity的protectedvoid onNewIntent(Intent intent) {}來交互.

@Override
protectedvoid onNewIntent(Intent intent) {
handleIntent(intent);
}
privatevoid handleIntent(Intent intent) {
if (Intent.ACTION_VIEW.equals(intent.getAction())) {
//查詢數據庫
Cursor searchCursor = getContentResolver().query(intent.getData(), null, null, null, null);
if (searchCursor != null && searchCursor.moveToFirst()) {
cityInput.setText(searchCursor.getString(searchCursor.getColumnIndex(City.CITY_DESCRIBE)));
}
}
@Override
publicboolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_weather, menu);
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
SearchView searchView = (SearchView) menu.findItem(R.id.search).getActionView();
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
searchView.setIconifiedByDefault(false);
returntrue;
}

以上的在網上可以搜索到,接下來是重點...

5. 需要數據庫支持

publicclass CityDatabaseHelper extends SQLiteOpenHelper {
protectedstaticfinal String DATABASE_NAME = "city.db";
protectedstaticfinalint DATABASE_VERSION = 6;
public String[] columns = new String[] {
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};
privatestaticfinal HashMap<String,String> mColumnMap = buildColumnMap();
public CityDatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
privatestatic HashMap<String,String> buildColumnMap() {
HashMap<String,String> map = new HashMap<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, "rowid AS " + BaseColumns._ID);
map.put(SearchManager.SUGGEST_COLUMN_INTENT_DATA_ID, "rowid AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA_ID);
return map;
}
@Override
publicvoid onCreate(SQLiteDatabase db) {
db.execSQL("create table "
+ City.TABLE_NAME
+ "(_id integer primary key autoincrement, city_id integer, city_name text, city_nickname text, city_describe text, city_img text, city_img_2 text)");
}
@Override
publicvoid onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("drop table if exists " + City.TABLE_NAME);
onCreate(db);
}
/**
* 用於ContentProvider調用,使用like的模糊查詢
*/
public Cursor search(String keyWord){
SQLiteQueryBuilder builder=new SQLiteQueryBuilder();
builder.setTables(City.TABLE_NAME);
builder.setProjectionMap(mColumnMap);
SQLiteDatabase db=getReadableDatabase();
return builder.query(db, columns, City.CITY_NAME + " like ? " + " or " + City.CITY_NICKNAME +" like ? ", new String[]{"%"+keyWord+"%", "%"+keyWord+"%"}, null, null,null);
}
}

6. 完成searchable.xml裡面注冊的ContentProvider

publicclass CityContentProvider extends ContentProvider {
publicstaticfinal String AUTHORITY = "com.lichen.cityprovider";
private SQLiteDatabase db;
private CityDatabaseHelper dbHelper;
privatestaticfinalint QUERY_NORMAL= 1;
privatestaticfinalint QUERY_BY_ID= 2;
privatestaticfinalint QUERY_SEARCH_CITY_NAME= 3;
publicstatic UriMatcher uriMatcher;
static{
uriMatcher=new UriMatcher(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);
}
@Override
publicboolean onCreate() {
dbHelper = new CityDatabaseHelper(getContext());
return dbHelper != null;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
db = dbHelper.getReadableDatabase();
switch (uriMatcher.match(uri)) {
case QUERY_SEARCH_CITY_NAME:
return dbHelper.search(selectionArgs[0]);
default:
thrownew IllegalArgumentException("Unknown Uri: " + uri);
}
}
}