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/** * Copyright 2010-present Facebook./*from w w w . jav a 2 s. c o m*/ * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.facebook.widget; import android.annotation.SuppressLint; import android.app.Activity; import android.content.res.TypedArray; import android.os.Bundle; import android.text.TextUtils; import android.util.AttributeSet; import com.facebook.AppEventsLogger; import com.facebook.FacebookException; import com.facebook.Request; import com.facebook.Session; import com.facebook.android.R; import com.facebook.internal.AnalyticsEvents; import com.facebook.model.GraphUser; import java.util.*; /** * Provides a Fragment that displays a list of a user's friends and allows one or more of the * friends to be selected. */ public class FriendPickerFragment extends PickerFragment<GraphUser> { /** * The key for a String parameter in the fragment's Intent bundle to indicate what user's * friends should be shown. The default is to display the currently authenticated user's friends. */ public static final String USER_ID_BUNDLE_KEY = "com.facebook.widget.FriendPickerFragment.UserId"; /** * The key for a boolean parameter in the fragment's Intent bundle to indicate whether the * picker should allow more than one friend to be selected or not. */ public static final String MULTI_SELECT_BUNDLE_KEY = "com.facebook.widget.FriendPickerFragment.MultiSelect"; private static final String ID = "id"; private static final String NAME = "name"; private String userId; private boolean multiSelect = true; private List<String> preSelectedFriendIds = new ArrayList<String>(); /** * Default constructor. Creates a Fragment with all default properties. */ public FriendPickerFragment() { this(null); } /** * Constructor. * @param args a Bundle that optionally contains one or more values containing additional * configuration information for the Fragment. */ @SuppressLint("ValidFragment") public FriendPickerFragment(Bundle args) { super(GraphUser.class, R.layout.com_facebook_friendpickerfragment, args); setFriendPickerSettingsFromBundle(args); } /** * Gets the ID of the user whose friends should be displayed. If null, the default is to * show the currently authenticated user's friends. * @return the user ID, or null */ public String getUserId() { return userId; } /** * Sets the ID of the user whose friends should be displayed. If null, the default is to * show the currently authenticated user's friends. * @param userId the user ID, or null */ public void setUserId(String userId) { this.userId = userId; } /** * Gets whether the user can select multiple friends, or only one friend. * @return true if the user can select multiple friends, false if only one friend */ public boolean getMultiSelect() { return multiSelect; } /** * Sets whether the user can select multiple friends, or only one friend. * @param multiSelect true if the user can select multiple friends, false if only one friend */ public void setMultiSelect(boolean multiSelect) { if (this.multiSelect != multiSelect) { this.multiSelect = multiSelect; setSelectionStrategy(createSelectionStrategy()); } } /** * Sets the list of friends for pre selection. These friends will be selected by default. * @param userIds list of friends as ids */ public void setSelectionByIds(List<String> userIds) { preSelectedFriendIds.addAll(userIds); } /** * Sets the list of friends for pre selection. These friends will be selected by default. * @param userIds list of friends as ids */ public void setSelectionByIds(String... userIds) { setSelectionByIds(Arrays.asList(userIds)); } /** * Sets the list of friends for pre selection. These friends will be selected by default. * @param graphUsers list of friends as GraphUsers */ public void setSelection(GraphUser... graphUsers) { setSelection(Arrays.asList(graphUsers)); } /** * Sets the list of friends for pre selection. These friends will be selected by default. * @param graphUsers list of friends as GraphUsers */ public void setSelection(List<GraphUser> graphUsers) { List<String> userIds = new ArrayList<String>(); for(GraphUser graphUser: graphUsers) { userIds.add(graphUser.getId()); } setSelectionByIds(userIds); } /** * Gets the currently-selected list of users. * @return the currently-selected list of users */ public List<GraphUser> getSelection() { return getSelectedGraphObjects(); } @Override public void onInflate(Activity activity, AttributeSet attrs, Bundle savedInstanceState) { super.onInflate(activity, attrs, savedInstanceState); TypedArray a = activity.obtainStyledAttributes(attrs, R.styleable.com_facebook_friend_picker_fragment); setMultiSelect(a.getBoolean(R.styleable.com_facebook_friend_picker_fragment_multi_select, multiSelect)); a.recycle(); } public void setSettingsFromBundle(Bundle inState) { super.setSettingsFromBundle(inState); setFriendPickerSettingsFromBundle(inState); } void saveSettingsToBundle(Bundle outState) { super.saveSettingsToBundle(outState); outState.putString(USER_ID_BUNDLE_KEY, userId); outState.putBoolean(MULTI_SELECT_BUNDLE_KEY, multiSelect); } @Override PickerFragmentAdapter<GraphUser> createAdapter() { PickerFragmentAdapter<GraphUser> adapter = new PickerFragmentAdapter<GraphUser>( this.getActivity()) { @Override protected int getGraphObjectRowLayoutId(GraphUser graphObject) { return R.layout.com_facebook_picker_list_row; } @Override protected int getDefaultPicture() { return R.drawable.com_facebook_profile_default_icon; } }; adapter.setShowCheckbox(true); adapter.setShowPicture(getShowPictures()); adapter.setSortFields(Arrays.asList(new String[]{NAME})); adapter.setGroupByField(NAME); return adapter; } @Override LoadingStrategy createLoadingStrategy() { return new ImmediateLoadingStrategy(); } @Override SelectionStrategy createSelectionStrategy() { return multiSelect ? new MultiSelectionStrategy() : new SingleSelectionStrategy(); } @Override Request getRequestForLoadData(Session session) { if (adapter == null) { throw new FacebookException("Can't issue requests until Fragment has been created."); } String userToFetch = (userId != null) ? userId : "me"; return createRequest(userToFetch, extraFields, session); } @Override String getDefaultTitleText() { return getString(R.string.com_facebook_choose_friends); } @Override void logAppEvents(boolean doneButtonClicked) { AppEventsLogger logger = AppEventsLogger.newLogger(this.getActivity(), getSession()); Bundle parameters = new Bundle(); // If Done was clicked, we know this completed successfully. If not, we don't know (caller might have // dismissed us in response to selection changing, or user might have hit back button). Either way // we'll log the number of selections. String outcome = doneButtonClicked ? AnalyticsEvents.PARAMETER_DIALOG_OUTCOME_VALUE_COMPLETED : AnalyticsEvents.PARAMETER_DIALOG_OUTCOME_VALUE_UNKNOWN; parameters.putString(AnalyticsEvents.PARAMETER_DIALOG_OUTCOME, outcome); parameters.putInt("num_friends_picked", getSelection().size()); logger.logSdkEvent(AnalyticsEvents.EVENT_FRIEND_PICKER_USAGE, null, parameters); } @Override public void loadData(boolean forceReload) { super.loadData(forceReload); setSelectedGraphObjects(preSelectedFriendIds); } private Request createRequest(String userID, Set<String> extraFields, Session session) { Request request = Request.newGraphPathRequest(session, userID + "/friends", null); Set<String> fields = new HashSet<String>(extraFields); String[] requiredFields = new String[]{ ID, NAME }; fields.addAll(Arrays.asList(requiredFields)); String pictureField = adapter.getPictureFieldSpecifier(); if (pictureField != null) { fields.add(pictureField); } Bundle parameters = request.getParameters(); parameters.putString("fields", TextUtils.join(",", fields)); request.setParameters(parameters); return request; } private void setFriendPickerSettingsFromBundle(Bundle inState) { // We do this in a separate non-overridable method so it is safe to call from the constructor. if (inState != null) { if (inState.containsKey(USER_ID_BUNDLE_KEY)) { setUserId(inState.getString(USER_ID_BUNDLE_KEY)); } setMultiSelect(inState.getBoolean(MULTI_SELECT_BUNDLE_KEY, multiSelect)); } } private class ImmediateLoadingStrategy extends LoadingStrategy { @Override protected void onLoadFinished(GraphObjectPagingLoader<GraphUser> loader, SimpleGraphObjectCursor<GraphUser> data) { super.onLoadFinished(loader, data); // We could be called in this state if we are clearing data or if we are being re-attached // in the middle of a query. if (data == null || loader.isLoading()) { return; } if (data.areMoreObjectsAvailable()) { // We got results, but more are available. followNextLink(); } else { // We finished loading results. hideActivityCircle(); // If this was from the cache, schedule a delayed refresh query (unless we got no results // at all, in which case refresh immediately. if (data.isFromCache()) { loader.refreshOriginalRequest(data.getCount() == 0 ? CACHED_RESULT_REFRESH_DELAY : 0); } } } private void followNextLink() { // This may look redundant, but this causes the circle to be alpha-dimmed if we have results. displayActivityCircle(); loader.followNextLink(); } } }