/*
* Copyright 2012 Google Inc.
*
* 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.google.android.apps.iosched.ui;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.support.v4.app.LoaderManager;
import android.support.v4.app.ShareCompat;
import android.support.v4.content.AsyncTaskLoader;
import android.support.v4.content.Loader;
import android.text.TextUtils;
import android.util.TypedValue;
import android.view.*;
import android.widget.AbsListView;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import com.google.analytics.tracking.android.EasyTracker;
import com.google.android.apps.iosched.Config;
import com.google.android.apps.iosched.R;
import com.google.android.apps.iosched.util.ImageLoader;
import com.google.android.apps.iosched.util.NetUtils;
import com.google.android.apps.iosched.util.UIUtils;
import com.google.api.client.extensions.android.json.AndroidJsonFactory;
import com.google.api.client.googleapis.services.CommonGoogleClientRequestInitializer;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.services.plus.Plus;
import com.google.api.services.plus.model.Activity;
import com.google.api.services.plus.model.ActivityFeed;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import static com.google.android.apps.iosched.util.LogUtils.LOGD;
import static com.google.android.apps.iosched.util.LogUtils.makeLogTag;
/**
* A fragment that renders Google+ search results for a given query, provided as the
* {@link SocialStreamFragment#EXTRA_QUERY} extra in the fragment arguments. If no
* search query is provided, the conference hashtag is used as the default query.
*/
public class SocialStreamFragment extends ListFragment implements
AbsListView.OnScrollListener,
LoaderManager.LoaderCallbacks<List<Activity>> {
private static final String TAG = makeLogTag(SocialStreamFragment.class);
public static final String EXTRA_QUERY = "com.google.android.apps.iosched.extra.QUERY";
public static final String EXTRA_ADD_VERTICAL_MARGINS
= "com.google.android.apps.iosched.extra.ADD_VERTICAL_MARGINS";
private static final String STATE_POSITION = "position";
private static final String STATE_TOP = "top";
private static final long MAX_RESULTS_PER_REQUEST = 20;
private static final String PLUS_RESULT_FIELDS =
"nextPageToken,items(id,annotation,updated,url,verb,actor(displayName,image)," +
"object(actor/displayName,attachments(displayName,image/url,objectType," +
"thumbnails(image/url,url),url),content,plusoners/totalItems,replies/totalItems," +
"resharers/totalItems))";
private static final int STREAM_LOADER_ID = 0;
private String mSearchString;
private List<Activity> mStream = new ArrayList<Activity>();
private StreamAdapter mStreamAdapter = new StreamAdapter();
private int mListViewStatePosition;
private int mListViewStateTop;
private ImageLoader mImageLoader;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final Intent intent = BaseActivity.fragmentArgumentsToIntent(getArguments());
// mSearchString can be populated before onCreate() by called refresh(String)
if (TextUtils.isEmpty(mSearchString)) {
mSearchString = intent.getStringExtra(EXTRA_QUERY);
}
if (TextUtils.isEmpty(mSearchString)) {
mSearchString = UIUtils.CONFERENCE_HASHTAG;
}
if (!mSearchString.startsWith("#")) {
mSearchString = "#" + mSearchString;
}
mImageLoader =
PlusStreamRowViewBinder.getPlusStreamImageLoader(getActivity(), getResources());
setHasOptionsMenu(true);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (savedInstanceState != null) {
mListViewStatePosition = savedInstanceState.getInt(STATE_POSITION, -1);
mListViewStateTop = savedInstanceState.getInt(STATE_TOP, 0);
} else {
mListViewStatePosition = -1;
mListViewStateTop = 0;
}
return super.onCreateView(inflater, container, savedInstanceState);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setEmptyText(getString(R.string.empty_social_stream));
// In support library r8, calling initLoader for a fragment in a FragmentPagerAdapter
// in the fragment's onCreate may cause the same LoaderManager to be dealt to multiple
// fragments because their mIndex is -1 (haven't been added to the activity yet). Thus,
// we do this in onActivityCreated.
getLoaderManager().initLoader(STREAM_LOADER_ID, null, this);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
final ListView listView = getListView();
if (!UIUtils.isTablet(getActivity())) {
view.setBackgroundColor(getResources().getColor(R.color.plus_stream_spacer_color));
}
if (getArguments() != null
&& getArguments().getBoolean(EXTRA_ADD_VERTICAL_MARGINS, false)) {
int verticalMargin = getResources().getDimensionPixelSize(
R.dimen.plus_stream_padding_vertical);
if (verticalMargin > 0) {
listView.setClipToPadding(false);
listView.setPadding(0, verticalMargin, 0, verticalMargin);
}
}
listView.setOnScrollListener(this);
listView.setDrawSelectorOnTop(true);
listView.setDivider(getResources().getDrawable(android.R.color.transparent));
listView.setDividerHeight(getResources()
.getDimensionPixelSize(R.dimen.page_margin_width));
TypedValue v = new TypedValue();
getActivity().getTheme().resolveAttribute(R.attr.activatableItemBackground, v, true);
listView.setSelector(v.resourceId);
setListAdapter(mStreamAdapter);
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.social_stream, menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_compose:
Intent intent = ShareCompat.IntentBuilder.from(getActivity())
.setType("text/plain")
.setText(mSearchString + "\n\n")
.getIntent();
UIUtils.preferPackageForIntent(getActivity(), intent,
UIUtils.GOOGLE_PLUS_PACKAGE_NAME);
startActivity(intent);
EasyTracker.getTracker().sendEvent("Home Screen Dashboard", "Click", "Post to G+", 0L);
LOGD("Tracker", "Home Screen Dashboard: Click, post to g+");
return true;
}
return false;
}
@Override
public void onPrepareOptionsMenu(Menu menu) {
}
@Override
public void onDestroyOptionsMenu() {
}
@Override
public void onSaveInstanceState(Bundle outState) {
if (isAdded()) {
View v = getListView().getChildAt(0);
int top = (v == null) ? 0 : v.getTop();
outState.putInt(STATE_POSITION, getListView().getFirstVisiblePosition());
outState.putInt(STATE_TOP, top);
}
super.onSaveInstanceState(outState);
}
public void refresh(String newQuery) {
mSearchString = newQuery;
refresh(true);
}
public void refresh() {
refresh(false);
}
public void refresh(boolean forceRefresh) {
if (isStreamLoading() && !forceRefresh) {
return;
}
// clear current items
mStream.clear();
mStreamAdapter.notifyDataSetInvalidated();
if (isAdded()) {
Loader loader = getLoaderManager().getLoader(STREAM_LOADER_ID);
((StreamLoader) loader).init(mSearchString);
}
loadMoreResults();
}
public void loadMoreResults() {
if (isAdded()) {
Loader loader = getLoaderManager().getLoader(STREAM_LOADER_ID);
if (loader != null) {
loader.forceLoad();
}
}
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
Activity activity = mStream.get(position);
Intent postDetailIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(activity.getUrl()));
postDetailIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
UIUtils.preferPackageForIntent(getActivity(), postDetailIntent,
UIUtils.GOOGLE_PLUS_PACKAGE_NAME);
startActivity(postDetailIntent);
}
@Override
public void onScrollStateChanged(AbsListView listView, int scrollState) {
// Pause disk cache access to ensure smoother scrolling
if (scrollState == AbsListView.OnScrollListener.SCROLL_STATE_FLING) {
mImageLoader.stopProcessingQueue();
} else {
mImageLoader.startProcessingQueue();
}
}
@Override
public void onScroll(AbsListView absListView, int firstVisibleItem, int visibleItemCount,
int totalItemCount) {
if (!isStreamLoading()
&& streamHasMoreResults()
&& visibleItemCount != 0
&& firstVisibleItem + visibleItemCount >= totalItemCount - 1) {
loadMoreResults();
}
}
@Override
public Loader<List<Activity>> onCreateLoader(int id, Bundle args) {
return new StreamLoader(getActivity(), mSearchString);
}
@Override
public void onLoadFinished(Loader<List<Activity>> listLoader, List<Activity> activities) {
if (activities != null) {
mStream = activities;
}
mStreamAdapter.notifyDataSetChanged();
if (mListViewStatePosition != -1 && isAdded()) {
getListView().setSelectionFromTop(mListViewStatePosition, mListViewStateTop);
mListViewStatePosition = -1;
}
}
@Override
public void onLoaderReset(Loader<List<Activity>> listLoader) {
}
private boolean isStreamLoading() {
if (isAdded()) {
final Loader loader = getLoaderManager().getLoader(STREAM_LOADER_ID);
if (loader != null) {
return ((StreamLoader) loader).isLoading();
}
}
return true;
}
private boolean streamHasMoreResults() {
if (isAdded()) {
final Loader loader = getLoaderManager().getLoader(STREAM_LOADER_ID);
if (loader != null) {
return ((StreamLoader) loader).hasMoreResults();
}
}
return false;
}
private boolean streamHasError() {
if (isAdded()) {
final Loader loader = getLoaderManager().getLoader(STREAM_LOADER_ID);
if (loader != null) {
return ((StreamLoader) loader).hasError();
}
}
return false;
}
private static class StreamLoader extends AsyncTaskLoader<List<Activity>> {
List<Activity> mActivities;
private String mSearchString;
private String mNextPageToken;
private boolean mIsLoading;
private boolean mHasError;
public StreamLoader(Context context, String searchString) {
super(context);
init(searchString);
}
private void init(String searchString) {
mSearchString = searchString;
mHasError = false;
mNextPageToken = null;
mIsLoading = true;
mActivities = null;
}
@Override
public List<Activity> loadInBackground() {
mIsLoading = true;
// Set up the HTTP transport and JSON factory
HttpTransport httpTransport = new NetHttpTransport();
JsonFactory jsonFactory = new AndroidJsonFactory();
// Set up the main Google+ class
Plus plus = new Plus.Builder(httpTransport, jsonFactory, null)
.setApplicationName(NetUtils.getUserAgent(getContext()))
.setGoogleClientRequestInitializer(
new CommonGoogleClientRequestInitializer(Config.API_KEY))
.build();
ActivityFeed activities = null;
try {
activities = plus.activities().search(mSearchString)
.setPageToken(mNextPageToken)
.setOrderBy("recent")
.setMaxResults(MAX_RESULTS_PER_REQUEST)
.setFields(PLUS_RESULT_FIELDS)
.execute();
mHasError = false;
mNextPageToken = activities.getNextPageToken();
} catch (IOException e) {
e.printStackTrace();
mHasError = true;
mNextPageToken = null;
}
return (activities != null) ? activities.getItems() : null;
}
@Override
public void deliverResult(List<Activity> activities) {
mIsLoading = false;
if (activities != null) {
if (mActivities == null) {
mActivities = activities;
} else {
mActivities.addAll(activities);
}
}
if (isStarted()) {
// Need to return new ArrayList for some reason or onLoadFinished() is not called
super.deliverResult(mActivities == null ?
null : new ArrayList<Activity>(mActivities));
}
}
@Override
protected void onStartLoading() {
if (mActivities != null) {
// If we already have results and are starting up, deliver what we already have.
deliverResult(null);
} else {
forceLoad();
}
}
@Override
protected void onStopLoading() {
mIsLoading = false;
cancelLoad();
}
@Override
protected void onReset() {
super.onReset();
onStopLoading();
mActivities = null;
}
public boolean isLoading() {
return mIsLoading;
}
public boolean hasMoreResults() {
return mNextPageToken != null;
}
public boolean hasError() {
return mHasError;
}
public void setSearchString(String searchString) {
mSearchString = searchString;
}
public void refresh() {
reset();
startLoading();
}
}
private class StreamAdapter extends BaseAdapter {
private static final int VIEW_TYPE_ACTIVITY = 0;
private static final int VIEW_TYPE_LOADING = 1;
@Override
public boolean areAllItemsEnabled() {
return false;
}
@Override
public boolean isEnabled(int position) {
return getItemViewType(position) == VIEW_TYPE_ACTIVITY;
}
@Override
public int getViewTypeCount() {
return 2;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public int getCount() {
return mStream.size() + (
// show the status list row if...
((isStreamLoading() && mStream.size() == 0) // ...this is the first load
|| streamHasMoreResults() // ...or there's another page
|| streamHasError()) // ...or there's an error
? 1 : 0);
}
@Override
public int getItemViewType(int position) {
return (position >= mStream.size())
? VIEW_TYPE_LOADING
: VIEW_TYPE_ACTIVITY;
}
@Override
public Object getItem(int position) {
return (getItemViewType(position) == VIEW_TYPE_ACTIVITY)
? mStream.get(position)
: null;
}
@Override
public long getItemId(int position) {
// TODO: better unique ID heuristic
return (getItemViewType(position) == VIEW_TYPE_ACTIVITY)
? mStream.get(position).getId().hashCode()
: -1;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (getItemViewType(position) == VIEW_TYPE_LOADING) {
if (convertView == null) {
convertView = getLayoutInflater(null).inflate(
R.layout.list_item_stream_status, parent, false);
}
if (streamHasError()) {
convertView.findViewById(android.R.id.progress).setVisibility(View.GONE);
((TextView) convertView.findViewById(android.R.id.text1)).setText(
R.string.stream_error);
} else {
convertView.findViewById(android.R.id.progress).setVisibility(View.VISIBLE);
((TextView) convertView.findViewById(android.R.id.text1)).setText(
R.string.loading);
}
return convertView;
} else {
Activity activity = (Activity) getItem(position);
if (convertView == null) {
convertView = getLayoutInflater(null).inflate(
R.layout.list_item_stream_activity, parent, false);
}
PlusStreamRowViewBinder.bindActivityView(convertView, activity, mImageLoader,
false);
return convertView;
}
}
}
}