如何在我的Android应用程序使用QuickSearchBox？ [英] How to use QuickSearchBox in my Android application?
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问题描述
我要实现我的应用程序搜索方法。我有一个数据库，我想用一个快速搜索框在该数据库中进行搜索。请帮我实现这个任务。
I want to implement a search method in my application. I have a database, I want to search in that database using a quick search box. Please help me to achieve this task.
推荐答案
三个文件是相关的，DataProvider的，DataIndex，改变AndroidManifest。 在我的情况下，数据对象，我想看看在我的数据库是位置数据对象，我的课因此得名，但可以将其用于你的逻辑没有问题。
Three files are relevant, DataProvider, DataIndex, changes to the AndroidManifest. In my case the data objects I want to look for in my database are 'Locations' data objects, hence the name of my classes, but you can apply it for your logic without problem.
LocationProvider.java：
LocationProvider.java:
package com.myapp.android.search;
import android.app.SearchManager;
import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.content.res.Resources;
import android.database.Cursor;
import android.database.MatrixCursor;
import android.net.Uri;
import android.text.TextUtils;
import android.util.Log;
import com.myapp.android.MyApp;
import com.myapp.android.model.Location;
import java.util.ArrayList;
/**
* Provides search suggestions for a list of words and their definitions.
*/
public class LocationProvider extends ContentProvider {
public static String AUTHORITY = "myapp_locations";
private static final int SEARCH_SUGGEST = 0;
private static final int SHORTCUT_REFRESH = 1;
private static final UriMatcher sURIMatcher = buildUriMatcher();
/**
* The columns we'll include in our search suggestions. There are others that could be used
* to further customize the suggestions, see the docs in {@link SearchManager} for the details
* on additional columns that are supported.
*/
private static final String[] COLUMNS = {
"_id", // must include this column
SearchManager.SUGGEST_COLUMN_TEXT_1,
SearchManager.SUGGEST_COLUMN_TEXT_2,
SearchManager.SUGGEST_COLUMN_INTENT_DATA,
};
/**
* Sets up a uri matcher for search suggestion and shortcut refresh queries.
*/
private static UriMatcher buildUriMatcher() {
UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
matcher.addURI(AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, SEARCH_SUGGEST);
matcher.addURI(AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", SEARCH_SUGGEST);
matcher.addURI(AUTHORITY, SearchManager.SUGGEST_URI_PATH_SHORTCUT, SHORTCUT_REFRESH);
matcher.addURI(AUTHORITY, SearchManager.SUGGEST_URI_PATH_SHORTCUT + "/*", SHORTCUT_REFRESH);
return matcher;
}
@Override
public boolean onCreate() {
Resources resources = getContext().getResources();
// LocationIndex.getInstance(this.getContext()).ensureLoaded(resources);
return true;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
String sortOrder) {
if (!TextUtils.isEmpty(selection)) {
throw new IllegalArgumentException("selection not allowed for " + uri);
}
if (selectionArgs != null && selectionArgs.length != 0) {
throw new IllegalArgumentException("selectionArgs not allowed for " + uri);
}
if (!TextUtils.isEmpty(sortOrder)) {
throw new IllegalArgumentException("sortOrder not allowed for " + uri);
}
switch (sURIMatcher.match(uri)) {
case SEARCH_SUGGEST:
String query = null;
if (uri.getPathSegments().size() > 1) {
query = uri.getLastPathSegment().toLowerCase();
}
return getSuggestions(query, projection);
case SHORTCUT_REFRESH:
String shortcutId = null;
if (uri.getPathSegments().size() > 1) {
shortcutId = uri.getLastPathSegment();
}
return refreshShortcut(shortcutId, projection);
default:
throw new IllegalArgumentException("Unknown URL " + uri);
}
}
private Cursor getSuggestions(String query, String[] projection) {
String processedQuery = query == null ? "" : query.toLowerCase();
ArrayList<Location> words = LocationIndex.getInstance().getMatches(processedQuery);
MatrixCursor cursor = new MatrixCursor(COLUMNS);
long id = 0;
for (Location word : words) {
cursor.addRow(columnValuesOfWord(id++, word));
}
return cursor;
}
private Object[] columnValuesOfWord(long id, Location loc) {
return new Object[] {
id, // _id
loc.getTitle(), // text1
loc.getDescription(), // text2
loc.getTitle(), // intent_data (included when clicking on item)
};
}
/**
* Note: this is unused as is, but if we included
* {@link SearchManager#SUGGEST_COLUMN_SHORTCUT_ID} as a column in our results, we
* could expect to receive refresh queries on this uri for the id provided, in which case we
* would return a cursor with a single item representing the refreshed suggestion data.
*/
private Cursor refreshShortcut(String shortcutId, String[] projection) {
return null;
}
/**
* All queries for this provider are for the search suggestion and shortcut refresh mime type.
*/
public String getType(Uri uri) {
switch (sURIMatcher.match(uri)) {
case SEARCH_SUGGEST:
return SearchManager.SUGGEST_MIME_TYPE;
case SHORTCUT_REFRESH:
return SearchManager.SHORTCUT_MIME_TYPE;
default:
throw new IllegalArgumentException("Unknown URL " + uri);
}
}
public Uri insert(Uri uri, ContentValues values) {
throw new UnsupportedOperationException();
}
public int delete(Uri uri, String selection, String[] selectionArgs) {
throw new UnsupportedOperationException();
}
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
throw new UnsupportedOperationException();
}
}
LocationIndex.java
LocationIndex.java
package com.myapp.android.search;
import com.myapp.android.model.Location;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.concurrent.ConcurrentHashMap;
public class LocationIndex {
private boolean mLoaded = false;
private static final LocationIndex sInstance = new LocationIndex();
private ArrayList<Location> locations;
private final ConcurrentHashMap<String, ArrayList<Location>> mDict = new ConcurrentHashMap<String, ArrayList<Location>>();
public static LocationIndex getInstance() {
return sInstance;
}
public synchronized void loadWords(ArrayList<Location> locations) { //throws IOException, Resources resources
if (mLoaded) return;
this.locations = locations;
for (Iterator<Location> iter=locations.iterator();iter.hasNext();) {
Location loc = iter.next();
if (loc!=null) addLocation(loc);
}
mLoaded = true;
}
public ArrayList<Location> getMatches(String query) {
ArrayList<Location> list = mDict.get(query);
return list == null ? new ArrayList<Location>() : list;
}
private void addLocation(Location loc) {
final int len = loc.getTitle().length();
for (int i = 0; i < len; i++) {
final String prefix = loc.getTitle().substring(0, len - i);
addMatch(prefix, loc);
}
}
private void addMatch(String query, Location loc) {
ArrayList<Location> matches = mDict.get(query);
if (matches == null) {
matches = new ArrayList<Location>();
mDict.put(query.toLowerCase(), matches);
}
matches.add(loc);
}
public ConcurrentHashMap<String, ArrayList<Location>> getmDict() {
return mDict;
}
}
AndroidManifest.xml中
AndroidManifest.xml
以下内容添加到您的清单...
add the following to your manifest...
<!-- Provides search suggestions for words and their definitions. -->
<provider android:name=".search.LocationProvider"
android:authorities="myapp_locations"
android:syncable="false"/>
<provider android:name=".content.LocalFileContentProvider"
android:authorities="com.myapp.android.localfile"
android:syncable="false"/>
在活动的意图过滤器要激活搜索（也许所有）：
and the intent filter in the activities you want to activate the search for (maybe all):
<intent-filter>
<action android:name="android.intent.action.SEARCH"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
这篇关于如何在我的Android应用程序使用QuickSearchBox？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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