/**
* Copyright 2012 Facebook
*
* 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.*;
import com.facebook.android.R;
import com.facebook.model.GraphUser;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* 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;
/**
* 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());
}
}
/**
* 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);
}
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();
}
}
}