Android----android利用数据库实现搜索联想功能

àì夳堔傛蜴生んèń 2022-03-28 07:16 366阅读 0赞

[【转】android利用数据库实现搜索联想功能][android]

主要实现的效果是和google搜索一样，实现联想功能，如用户输入a，列表中则显示以a开头的数据库中的信息。下面是实现的效果图：

[![image][]][image 1] [![image][image 2]][image_image 2]

*  实现过程主要是添加所有的数据到数据库中。
 *  调用搜索控件，可见[android利用onSearchRequested()调用内部搜索ui组件][android_onSearchRequested_ui]。
 *  根据用户输入的信息显示联想的所有词的列表。
 *  根据用户选择，显示相应的结果。

实现的主要代码：

> public class SearchProvider extends ContentProvider \{ @Override public int delete(Uri uri, String selection, String\[\] selectionArgs) \{ return 0; \}
> 
> @Override public String getType(Uri uri) \{ return null; \} @Override public Uri insert(Uri uri, ContentValues values) \{ return null; \}
> 
> @Override public boolean onCreate() \{ // 添加所有的数据 SearchUtil.getInstance().ensureLoaded(); return true; \}
> 
> @Override public Cursor query(Uri uri, String\[\] projection, String selection, String\[\] selectionArgs, String sortOrder) \{ String query = null; if (uri.getPathSegments().size() > 1) \{ query = uri.getLastPathSegment().toLowerCase(); \} return getSuggestions(query); \}
> 
> private Cursor getSuggestions(String query) \{ String processedQuery = query == null ? "" : query.toLowerCase(); List<SearchUtil.Word> words = SearchUtil.getInstance().getMatches( processedQuery);
> 
> MatrixCursor cursor = new MatrixCursor(COLUMNS); long id = 0; for (SearchUtil.Word word : words) \{ cursor.addRow(columnValuesOfWord(id++, word)); \}
> 
> return cursor; \}
> 
> private Object\[\] columnValuesOfWord(long id, SearchUtil.Word word) \{ return new Object\[\] \{ id, // \_id word.word, // text1 word.definition, // text2 word.word, // intent\_data (included when clicking on item) \}; \}
> 
> private static final String\[\] COLUMNS = \{ "\_id", SearchManager.SUGGEST\_COLUMN\_TEXT\_1, SearchManager.SUGGEST\_COLUMN\_TEXT\_2, SearchManager.SUGGEST\_COLUMN\_INTENT\_DATA,// 数据传递到intenter中 \};
> 
> @Override public int update(Uri uri, ContentValues values, String selection, String\[\] selectionArgs) \{ return 0; \}

相关搜索的配置：

> <application android:icon="@drawable/icon" android:label="@string/app\_name"> <activity android:name=".SearchActivty" android:label="@string/app\_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> <intent-filter> <action android:name="android.intent.action.SEARCH" /> <category android:name="android.intent.category.DEFAULT" /> </intent-filter> <meta-data android:name="android.app.searchable" **android:resource="@xml/searchable" />**  </activity> <activity android:name=".ResultActivty" android:label="@string/search\_query\_results"> </activity> <provider android:name="SearchProvider" android:authorities="search" android:syncable="false" /> </application>

在res的xml文件夹下创建searchable.xml

> <?xml version="1.0" encoding="utf-8"?> <searchable xmlns:android="[http://schemas.android.com/apk/res/android"][http_schemas.android.com_apk_res_android] android:label="@string/search\_label" android:searchSuggestAuthority="search" android:searchSuggestIntentAction="android.intent.action.VIEW" > </searchable>

结果返回：

> public void onCreate(Bundle savedInstanceState) \{ super.onCreate(savedInstanceState); Intent intent = this.getIntent(); setContentView(R.layout.main); if (Intent.ACTION\_VIEW.equals(intent.getAction())) \{ SearchUtil.Word theWord = SearchUtil.getInstance().getMatches( intent.getDataString().trim().toLowerCase()).get(0); launchWord(theWord); finish(); \} else \{ Button button = (Button) findViewById(R.id.button); button.setOnTouchListener(new OnTouchListener() \{ @Override public boolean onTouch(View v, MotionEvent event) \{ onSearchRequested(); return false; \} \}); \} \} private void launchWord(SearchUtil.Word pavilion) \{ Intent next = new Intent(); next.setClass(this, ResultActivty.class); Bundle bundle = new Bundle(); bundle.putString("word", pavilion.word); next.putExtras(bundle); next.putExtras(bundle); startActivity(next); \}

其中联想的列表还可以实现自定义的列表，需要进一步细化。

源代码：[http://easymorse-android.googlecode.com/svn/tags/search/][http_easymorse-android.googlecode.com_svn_tags_search]

[android]: http://www.cnblogs.com/topcoderliu/archive/2011/05/16/2047565.html
[image]: http://wangjun.easymorse.com/wp-content/uploads/2010/05/image_thumb5.png
[image 1]: http://wangjun.easymorse.com/wp-content/uploads/2010/05/image5.png
[image 2]: http://wangjun.easymorse.com/wp-content/uploads/2010/05/image_thumb6.png
[image_image 2]: http://wangjun.easymorse.com/wp-content/uploads/2010/05/image6.png
[android_onSearchRequested_ui]: http://wangjun.easymorse.com/?p=278
[http_schemas.android.com_apk_res_android]: http://schemas.android.com/apk/res/android%22
[http_easymorse-android.googlecode.com_svn_tags_search]: http://easymorse-android.googlecode.com/svn/tags/search/