Java tutorial
/* * Firetweet - Twitter client for Android * * Copyright (C) 2012-2014 Mariotaku Lee <mariotaku.lee@gmail.com> * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * 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 org.getlantern.firetweet.fragment.support; import android.content.ActivityNotFoundException; import android.content.Context; import android.content.SharedPreferences; import android.os.Bundle; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.Loader; import android.util.Log; import android.view.MenuItem; import android.view.MenuItem.OnMenuItemClickListener; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemLongClickListener; import android.widget.ListView; import org.getlantern.firetweet.adapter.ParcelableUsersAdapter; import org.getlantern.firetweet.adapter.iface.IBaseCardAdapter.MenuButtonClickListener; import org.getlantern.firetweet.loader.support.DummyParcelableUsersLoader; import org.getlantern.firetweet.model.ParcelableUser; import org.getlantern.firetweet.util.MultiSelectManager; import org.getlantern.firetweet.util.Utils; import org.getlantern.firetweet.util.collection.NoDuplicatesArrayList; import java.util.Collections; import java.util.List; import static org.getlantern.firetweet.util.Utils.clearListViewChoices; import static org.getlantern.firetweet.util.Utils.configBaseCardAdapter; import static org.getlantern.firetweet.util.Utils.getActivatedAccountIds; import static org.getlantern.firetweet.util.Utils.openUserProfile; abstract class BaseUsersListFragment extends BasePullToRefreshListFragment implements LoaderCallbacks<List<ParcelableUser>>, OnItemLongClickListener, OnMenuItemClickListener, MultiSelectManager.Callback, MenuButtonClickListener { private SharedPreferences mPreferences; private MultiSelectManager mMultiSelectManager; private ParcelableUsersAdapter mAdapter; private ListView mListView; private long mAccountId; private final List<ParcelableUser> mData = Collections .synchronizedList(new NoDuplicatesArrayList<ParcelableUser>()); private ParcelableUser mSelectedUser; public long getAccountId() { return mAccountId; } public final List<ParcelableUser> getData() { return mData; } @Override public ParcelableUsersAdapter getListAdapter() { return mAdapter; } public SharedPreferences getSharedPreferences() { return mPreferences; } public void loadMoreUsers() { if (isRefreshing()) return; final int count = mAdapter.getCount(); if (count - 1 > 0) { final Bundle args = getArguments(); if (args != null) { args.putLong(EXTRA_MAX_ID, mAdapter.getItem(count - 1).id); } if (!getLoaderManager().hasRunningLoaders()) { getLoaderManager().restartLoader(0, args, this); } } } @Override public void onActivityCreated(final Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mPreferences = getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE); mAdapter = new ParcelableUsersAdapter(getActivity()); mMultiSelectManager = getMultiSelectManager(); mListView = getListView(); mListView.setFastScrollEnabled(mPreferences.getBoolean(KEY_FAST_SCROLL_THUMB, false)); final Bundle args = getArguments() != null ? getArguments() : new Bundle(); final long accountId = args.getLong(EXTRA_ACCOUNT_ID, -1); if (mAccountId != accountId) { mAdapter.clear(); mData.clear(); } mAccountId = accountId; if (!mPreferences.getBoolean(KEY_COMPACT_CARDS, false)) { mListView.setDivider(null); } mListView.setSelector(android.R.color.transparent); mListView.setOnItemLongClickListener(this); setListAdapter(mAdapter); getLoaderManager().initLoader(0, getArguments(), this); setListShown(false); } @Override public Loader<List<ParcelableUser>> onCreateLoader(final int id, final Bundle args) { setProgressBarIndeterminateVisibility(true); final Loader<List<ParcelableUser>> loader = newLoaderInstance(getActivity(), args); return loader != null ? loader : new DummyParcelableUsersLoader(getActivity()); } @Override public boolean onItemLongClick(final AdapterView<?> parent, final View view, final int position, final long id) { final ParcelableUsersAdapter adapter = getListAdapter(); final int userPosition = adapter.findItemPosition(id); if (userPosition < 0) return false; final ParcelableUser user = adapter.getItem(userPosition); setItemSelected(user, position, !mMultiSelectManager.isSelected(user)); return true; } @Override public void onItemsCleared() { clearListViewChoices(mListView); } @Override public void onItemSelected(final Object item) { mListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); } @Override public void onItemUnselected(final Object item) { } @Override public void onListItemClick(final ListView l, final View v, final int position, final long id) { final ParcelableUsersAdapter adapter = getListAdapter(); final int userPosition = adapter.findItemPosition(id); if (userPosition < 0) return; final ParcelableUser user = adapter.getItem(userPosition); if (mMultiSelectManager.isActive()) { setItemSelected(user, position, !mMultiSelectManager.isSelected(user)); return; } openUserProfile(getActivity(), user, null); } @Override public void onLoaderReset(final Loader<List<ParcelableUser>> loader) { setProgressBarIndeterminateVisibility(false); } @Override public void onLoadFinished(final Loader<List<ParcelableUser>> loader, final List<ParcelableUser> data) { setProgressBarIndeterminateVisibility(false); mAdapter.setData(data); mAdapter.setShowAccountColor(shouldShowAccountColor()); setRefreshing(false); setListShown(true); } @Override public void onMenuButtonClick(final View button, final int position, final long id) { final ParcelableUser user = mAdapter.getItem(position - mListView.getHeaderViewsCount()); if (user == null) return; showMenu(button, user); } @Override public boolean onMenuItemClick(final MenuItem item) { if (mSelectedUser == null) return false; switch (item.getItemId()) { default: { if (item.getIntent() != null) { try { startActivity(item.getIntent()); } catch (final ActivityNotFoundException e) { Log.w(LOGTAG, e); return false; } } break; } } return true; } @Override public void onReachedBottom() { loadMoreUsers(); } @Override public void onRefresh() { if (isRefreshing()) return; getLoaderManager().restartLoader(0, getArguments(), this); } @Override public void onResume() { super.onResume(); configBaseCardAdapter(getActivity(), mAdapter); } @Override public void onStart() { super.onStart(); mMultiSelectManager.registerCallback(this); final int choiceMode = mListView.getChoiceMode(); if (mMultiSelectManager.isActive()) { if (choiceMode != ListView.CHOICE_MODE_MULTIPLE) { mListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); } } else { if (choiceMode != ListView.CHOICE_MODE_NONE) { Utils.clearListViewChoices(mListView); } } } @Override public void onStop() { mMultiSelectManager.unregisterCallback(this); super.onStop(); } protected ParcelableUser getSelectedUser() { return mSelectedUser; } protected int getUserMenuResource() { return 0; } protected abstract Loader<List<ParcelableUser>> newLoaderInstance(Context context, Bundle args); protected final void removeUsers(final long... userIds) { if (userIds == null || userIds.length == 0) return; for (final long userId : userIds) { mData.remove(mAdapter.findItemPosition(userId)); } mAdapter.setData(mData, true); } protected void setItemSelected(final ParcelableUser user, final int position, final boolean selected) { if (selected) { mMultiSelectManager.selectItem(user); } else { mMultiSelectManager.unselectItem(user); } mListView.setItemChecked(position, selected); } protected boolean shouldShowAccountColor() { return getActivatedAccountIds(getActivity()).length > 1; } private void showMenu(final View view, final ParcelableUser user) { mSelectedUser = user; //TODO show menu } }