【转】android利用数据库实现搜索联想功能

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;
}

<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>

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

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);
}