Java tutorial
/** * ownCloud Android client application * * @author David A. Velasco * Copyright (C) 2015 ownCloud Inc. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2, * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * */ package com.owncloud.android.providers; import android.accounts.Account; import android.app.SearchManager; import android.content.ContentProvider; import android.content.ContentValues; import android.content.UriMatcher; import android.database.Cursor; import android.database.MatrixCursor; import android.net.Uri; import android.os.Handler; import android.os.Looper; import android.provider.BaseColumns; import android.support.annotation.Nullable; import android.widget.Toast; import com.owncloud.android.R; import com.owncloud.android.authentication.AccountUtils; import com.owncloud.android.lib.common.operations.RemoteOperationResult; import com.owncloud.android.lib.common.utils.Log_OC; import com.owncloud.android.lib.resources.shares.GetRemoteShareesOperation; import com.owncloud.android.utils.ErrorMessageAdapter; import org.json.JSONException; import org.json.JSONObject; import java.util.ArrayList; import java.util.Iterator; import java.util.List; /** * Content provider for search suggestions, to search for users and groups existing in an ownCloud server. */ public class UsersAndGroupsSearchProvider extends ContentProvider { private static final String TAG = UsersAndGroupsSearchProvider.class.getSimpleName(); private static final String[] COLUMNS = { BaseColumns._ID, SearchManager.SUGGEST_COLUMN_TEXT_1, SearchManager.SUGGEST_COLUMN_INTENT_DATA }; private static final int SEARCH = 1; private static final int RESULTS_PER_PAGE = 50; private static final int REQUESTED_PAGE = 1; public static final String AUTHORITY = UsersAndGroupsSearchProvider.class.getCanonicalName(); public static final String ACTION_SHARE_WITH = AUTHORITY + ".action.SHARE_WITH"; public static final String DATA_USER = AUTHORITY + ".data.user"; public static final String DATA_GROUP = AUTHORITY + ".data.group"; private UriMatcher mUriMatcher; @Nullable @Override public String getType(Uri uri) { // TODO implement return null; } @Override public boolean onCreate() { mUriMatcher = new UriMatcher(UriMatcher.NO_MATCH); mUriMatcher.addURI(AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", SEARCH); return true; } /** * TODO description * * Reference: http://developer.android.com/guide/topics/search/adding-custom-suggestions.html#CustomContentProvider * * @param uri Content {@link Uri}, formattted as * "content://com.owncloud.android.providers.UsersAndGroupsSearchProvider/" + * {@link android.app.SearchManager#SUGGEST_URI_PATH_QUERY} + "/" + 'userQuery' * @param projection Expected to be NULL. * @param selection Expected to be NULL. * @param selectionArgs Expected to be NULL. * @param sortOrder Expected to be NULL. * @return Cursor with users and groups in the ownCloud server that match 'userQuery'. */ @Nullable @Override public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { Log_OC.d(TAG, "query received in thread " + Thread.currentThread().getName()); int match = mUriMatcher.match(uri); switch (match) { case SEARCH: return searchForUsersOrGroups(uri); default: return null; } } private Cursor searchForUsersOrGroups(Uri uri) { MatrixCursor response = null; String userQuery = uri.getLastPathSegment().toLowerCase(); /// need to trust on the AccountUtils to get the current account since the query in the client side is not /// directly started by our code, but from SearchView implementation Account account = AccountUtils.getCurrentOwnCloudAccount(getContext()); /// request to the OC server about users and groups matching userQuery GetRemoteShareesOperation searchRequest = new GetRemoteShareesOperation(userQuery, REQUESTED_PAGE, RESULTS_PER_PAGE); RemoteOperationResult result = searchRequest.execute(account, getContext()); List<JSONObject> names = new ArrayList<JSONObject>(); if (result.isSuccess()) { for (Object o : result.getData()) { // Get JSonObjects from response names.add((JSONObject) o); } } else { showErrorMessage(result); } /// convert the responses from the OC server to the expected format if (names.size() > 0) { response = new MatrixCursor(COLUMNS); Iterator<JSONObject> namesIt = names.iterator(); int count = 0; JSONObject item; String displayName; Uri dataUri; Uri userBaseUri = new Uri.Builder().scheme("content").authority(DATA_USER).build(); Uri groupBaseUri = new Uri.Builder().scheme("content").authority(DATA_GROUP).build(); try { while (namesIt.hasNext()) { item = namesIt.next(); String userName = item.getString(GetRemoteShareesOperation.PROPERTY_LABEL); JSONObject value = item.getJSONObject(GetRemoteShareesOperation.NODE_VALUE); byte type = (byte) value.getInt(GetRemoteShareesOperation.PROPERTY_SHARE_TYPE); String shareWith = value.getString(GetRemoteShareesOperation.PROPERTY_SHARE_WITH); if (GetRemoteShareesOperation.GROUP_TYPE.equals(type)) { displayName = getContext().getString(R.string.share_group_clarification, userName); dataUri = Uri.withAppendedPath(groupBaseUri, shareWith); } else { displayName = userName; dataUri = Uri.withAppendedPath(userBaseUri, shareWith); } response.newRow().add(count++) // BaseColumns._ID .add(displayName) // SearchManager.SUGGEST_COLUMN_TEXT_1 .add(dataUri); } } catch (JSONException e) { Log_OC.e(TAG, "Exception while parsing data of users/groups", e); } } return response; } @Nullable @Override public Uri insert(Uri uri, ContentValues values) { // TODO implementation return null; } @Override public int delete(Uri uri, String selection, String[] selectionArgs) { // TODO implementation return 0; } @Override public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { // TODO implementation return 0; } /** * Show error message * * @param result Result with the failure information. */ public void showErrorMessage(final RemoteOperationResult result) { Handler handler = new Handler(Looper.getMainLooper()); handler.post(new Runnable() { @Override public void run() { // The Toast must be shown in the main thread to grant that will be hidden correctly; otherwise // the thread may die before, an exception will occur, and the message will be left on the screen // until the app dies Toast.makeText(getContext().getApplicationContext(), ErrorMessageAdapter.getErrorCauseMessage(result, null, getContext().getResources()), Toast.LENGTH_SHORT).show(); } }); } }