Java tutorial
/* * Copyright (C) 2014 barter.li * * 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 li.barter.fragments; import android.app.Activity; import android.content.BroadcastReceiver; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.IntentFilter; import android.database.Cursor; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.Loader; import android.support.v4.content.LocalBroadcastManager; import android.support.v4.view.MenuItemCompat; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.support.v7.widget.ShareActionProvider; import android.text.TextUtils; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import com.google.android.gms.analytics.HitBuilders.EventBuilder; import com.sothree.slidinguppanel.SlidingUpPanelLayout; import com.sothree.slidinguppanel.SlidingUpPanelLayout.PanelSlideListener; import java.util.Locale; import li.barter.R; import li.barter.analytics.AnalyticsConstants.Actions; import li.barter.analytics.AnalyticsConstants.Categories; import li.barter.analytics.AnalyticsConstants.ParamKeys; import li.barter.analytics.AnalyticsConstants.ParamValues; import li.barter.analytics.AnalyticsConstants.Screens; import li.barter.analytics.GoogleAnalyticsManager; import li.barter.data.DatabaseColumns; import li.barter.data.SQLiteLoader; import li.barter.data.TableSearchBooks; import li.barter.http.IBlRequestContract; import li.barter.http.ResponseInfo; import li.barter.utils.AppConstants; import li.barter.utils.AppConstants.FragmentTags; import li.barter.utils.AppConstants.Keys; import li.barter.utils.AppConstants.Loaders; import li.barter.utils.Logger; import li.barter.utils.SharedPreferenceHelper; import li.barter.utils.Utils; /** * @author Anshul Kamboj Fragment for Paging Books Around Me. Also contains a Profile that the user * can chat directly with the owner */ public class BooksPagerFragment extends AbstractBarterLiFragment implements LoaderCallbacks<Cursor>, OnPageChangeListener, PanelSlideListener { private static final String TAG = "BookDetailPagerFragment"; /** * {@link BookPageAdapter} holds the {@link BookDetailFragment} as viewpager */ private BookPageAdapter mAdapter; /** * ViewPager which holds the fragment */ private ViewPager mBookDetailPager; /** * It holds the Book which is clicked */ private int mBookPosition; /** * Used to provide a slide up UI companent to place the user's profile fragment */ private SlidingUpPanelLayout mSlidingLayout; /** * Intent filter for chat button click events */ private final IntentFilter mChatButtonIntentFilter = new IntentFilter(AppConstants.ACTION_CHAT_BUTTON_CLICKED); /** * Intent filter for button click events in book detail */ private final IntentFilter mChatLaunchIntentFilter = new IntentFilter(AppConstants.ACTION_LAUNCH_CHAT); /** * Receiver for chat button click events */ private ChatButtonReceiver mChatButtonReceiver = new ChatButtonReceiver(); /** * Receiver for book detail buy/borrow events */ private ChatLaunchReceiver mChatLaunchReceiver = new ChatLaunchReceiver(); private ShareActionProvider mShareActionProvider; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { init(container, savedInstanceState); setHasOptionsMenu(true); final View view = inflater.inflate(R.layout.fragment_books_pager, container, false); final Bundle extras = getArguments(); if (extras != null) { mBookPosition = extras.getInt(Keys.BOOK_POSITION); } mBookDetailPager = (ViewPager) view.findViewById(R.id.pager_books); mBookDetailPager.setOnPageChangeListener(this); mSlidingLayout = (SlidingUpPanelLayout) view.findViewById(R.id.sliding_layout); mSlidingLayout.setPanelSlideListener(this); mAdapter = new BookPageAdapter(getChildFragmentManager(), null); mBookDetailPager.setAdapter(mAdapter); if (savedInstanceState == null) { final ProfileFragment fragment = new ProfileFragment(); getChildFragmentManager().beginTransaction() .replace(R.id.content_user_profile, fragment, FragmentTags.USER_PROFILE).commit(); } else { mBookPosition = savedInstanceState.getInt(Keys.BOOK_POSITION); } loadBookSearchResults(); return view; } @Override public void onSaveInstanceState(final Bundle outState) { super.onSaveInstanceState(outState); outState.putInt(Keys.BOOK_POSITION, mBookDetailPager.getCurrentItem()); } @Override public void onResume() { super.onResume(); LocalBroadcastManager.getInstance(getActivity()).registerReceiver(mChatButtonReceiver, mChatButtonIntentFilter); LocalBroadcastManager.getInstance(getActivity()).registerReceiver(mChatLaunchReceiver, mChatLaunchIntentFilter); } @Override public void onPause() { super.onPause(); LocalBroadcastManager.getInstance(getActivity()).unregisterReceiver(mChatButtonReceiver); LocalBroadcastManager.getInstance(getActivity()).unregisterReceiver(mChatLaunchReceiver); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.menu_book_detail, menu); final MenuItem menuItem = menu.findItem(R.id.action_share); mShareActionProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(menuItem); if (mAdapter.getCount() > 0) { final int position = mBookDetailPager.getCurrentItem(); updateShareIntent(mAdapter.getBookTitleForPosition(position)); updateUserProfile(position); } else { updateShareIntent(null); } } /** * Starts the loader for book search results */ private void loadBookSearchResults() { getLoaderManager().restartLoader(Loaders.SEARCH_BOOKS_ON_PAGER, null, this); } /** * Pager Adapter to page between books for Search */ public class BookPageAdapter extends FragmentPagerAdapter { private Cursor mCursor; public BookPageAdapter(FragmentManager fm, Cursor cursor) { super(fm); mCursor = cursor; notifyDataSetChanged(); } /** * Swaps the backing Cursor with a new one */ public Cursor swapCursor(final Cursor newCursor) { final Cursor oldCursor = mCursor; mCursor = newCursor; notifyDataSetChanged(); return oldCursor; } @Override public int getCount() { return mCursor != null ? mCursor.getCount() : 0; } @Override public Fragment getItem(int position) { mCursor.moveToPosition(position); final BookDetailFragment fragment = BookDetailFragment.newInstance(Utils.cursorToBundle(mCursor)); return fragment; } public String getBookTitleForPosition(int position) { mCursor.moveToPosition(position); return mCursor.getString(mCursor.getColumnIndex(DatabaseColumns.TITLE)); } public String getUserIdForPosition(int position) { mCursor.moveToPosition(position); return mCursor.getString(mCursor.getColumnIndex(DatabaseColumns.USER_ID)); } } @Override protected Object getTaskTag() { return hashCode(); } @Override public void onSuccess(int requestId, IBlRequestContract request, ResponseInfo response) { } @Override public void onBadRequestError(int requestId, IBlRequestContract request, int errorCode, String errorMessage, Bundle errorResponseBundle) { } @Override public Loader<Cursor> onCreateLoader(int loaderId, Bundle arg1) { if (loaderId == Loaders.SEARCH_BOOKS_ON_PAGER) { return new SQLiteLoader(getActivity(), false, TableSearchBooks.NAME, null, null, null, null, null, null, null); } else { return null; } } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) { if (loader.getId() == Loaders.SEARCH_BOOKS_ON_PAGER) { mAdapter.swapCursor(cursor); if (cursor.getCount() > 0) { mBookDetailPager.setCurrentItem(mBookPosition); /* * Viewpager doesn't call on page selected() on the listener if the * set item is 0. This is to workaround that */ if (mBookPosition == 0 && cursor.getCount() > 0) { onPageSelected(mBookPosition); } } } } @Override public void onLoaderReset(Loader<Cursor> loader) { } @Override public void onPageScrollStateChanged(int state) { } @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { updateShareIntent(mAdapter.getBookTitleForPosition(position)); updateUserProfile(position); } /** * Updates the book owner profile for a particular selection * * @param position The book page selected */ private void updateUserProfile(int position) { final ProfileFragment fragment = (ProfileFragment) getChildFragmentManager() .findFragmentByTag(FragmentTags.USER_PROFILE); if (fragment != null) { fragment.setUserId(mAdapter.getUserIdForPosition(position)); } } /** * Updates the share intent */ private void updateShareIntent(String bookTitle) { if (mShareActionProvider == null) { return; } if (TextUtils.isEmpty(bookTitle)) { mShareActionProvider.setShareIntent(Utils.createAppShareIntent(getActivity())); return; } final String referralId = SharedPreferenceHelper.getString(R.string.pref_share_token); String appShareUrl = getString(R.string.book_share_message, bookTitle).concat(AppConstants.PLAY_STORE_LINK); if (!TextUtils.isEmpty(referralId)) { appShareUrl = appShareUrl.concat(String.format(Locale.US, AppConstants.REFERRER_FORMAT, referralId)); } final Intent shareIntent = Utils.createShareIntent(getActivity(), appShareUrl); mShareActionProvider.setShareIntent(shareIntent); } @Override public void onPanelSlide(View panel, float slideOffset) { } @Override public void onPanelExpanded(View panel) { setActionBarTitle(R.string.owner_profile); } @Override public void onPanelCollapsed(View panel) { setActionBarTitle(R.string.Book_Detail_fragment_title); } @Override public void onPanelAnchored(View panel) { } @Override public void onDialogClick(DialogInterface dialog, int which) { ((ProfileFragment) getChildFragmentManager().findFragmentByTag(FragmentTags.USER_PROFILE)) .onDialogClick(dialog, which); } @Override public boolean willHandleDialog(DialogInterface dialog) { return ((ProfileFragment) getChildFragmentManager().findFragmentByTag(FragmentTags.USER_PROFILE)) .willHandleDialog(dialog); } /** * @param view The drag handle to be set for the Sliding Pane Layout */ public void setDragHandle(View view) { Logger.v(TAG, "Setting Drag View %s", view.toString()); mSlidingLayout.setDragView(view); mSlidingLayout.setEnableDragViewTouchEvents(false); } @Override public boolean onBackPressed() { if (mSlidingLayout.isExpanded()) { mSlidingLayout.collapsePane(); return true; } else { return super.onBackPressed(); } } @Override protected String getAnalyticsScreenName() { return Screens.BOOKS_PAGER; } /** * Broadcast receiver for receiver chat button clicked events * * @author Vinay S Shenoy */ private final class ChatButtonReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { if (mSlidingLayout.isExpanded()) { GoogleAnalyticsManager.getInstance() .sendEvent(new EventBuilder(Categories.USAGE, Actions.CHAT_INITIALIZATION) .set(ParamKeys.TYPE, ParamValues.PROFILE)); } else { GoogleAnalyticsManager.getInstance() .sendEvent(new EventBuilder(Categories.USAGE, Actions.CHAT_INITIALIZATION) .set(ParamKeys.TYPE, ParamValues.BOOK)); } } } @Override public void onActivityResult(final int requestCode, final int resultCode, final Intent data) { if (requestCode == AppConstants.RequestCodes.LOGIN_TO_CHAT) { final ProfileFragment profileFragment = (ProfileFragment) getChildFragmentManager() .findFragmentByTag(FragmentTags.USER_PROFILE); if (profileFragment != null && profileFragment.isAttached()) { profileFragment.onActivityResult(requestCode, resultCode, data); } } else { super.onActivityResult(requestCode, resultCode, data); } } /** * Custom class that handles broadcast intents to launch the chat screen */ private final class ChatLaunchReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { final String action = intent.getAction(); if (AppConstants.ACTION_LAUNCH_CHAT.equals(action)) { final String prefilledChatMessage = intent.getStringExtra(Keys.CHAT_MESSAGE); final ProfileFragment fragment = (ProfileFragment) getChildFragmentManager() .findFragmentByTag(FragmentTags.USER_PROFILE); if (fragment != null) { fragment.chatWithUser(prefilledChatMessage); } } } } }