Java tutorial
/* * Tweetings - Twitter client for Android * * Copyright (C) 2012-2013 RBD Solutions Limited <apps@tweetings.net> * Copyright (C) 2012 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 com.dwdesign.tweetings.fragment; import static com.dwdesign.tweetings.util.Utils.getActivatedAccountIds; import java.util.ArrayList; import java.util.List; import com.dwdesign.popupmenu.PopupMenu; import com.dwdesign.popupmenu.PopupMenu.OnMenuItemClickListener; import com.dwdesign.tweetings.R; import com.dwdesign.tweetings.activity.HomeActivity; import com.dwdesign.tweetings.adapter.UsersAdapter; import com.dwdesign.tweetings.app.TweetingsApplication; import com.dwdesign.tweetings.model.Panes; import com.dwdesign.tweetings.model.ParcelableUser; import com.dwdesign.tweetings.util.NoDuplicatesLinkedList; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.SharedPreferences; import android.graphics.Color; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.Loader; import android.view.MenuItem; import android.view.View; import android.widget.AbsListView; import android.widget.AbsListView.OnScrollListener; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.AdapterView.OnItemLongClickListener; import android.widget.ListView; import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode; abstract class BaseUsersListFragment extends PullToRefreshListFragment implements LoaderCallbacks<List<ParcelableUser>>, OnItemClickListener, OnScrollListener, OnItemLongClickListener, Panes.Left, OnMenuItemClickListener { private SharedPreferences mPreferences; private PopupMenu mPopupMenu; protected TweetingsApplication mApplication; protected UsersAdapter mAdapter; private boolean mLoadMoreAutomatically; private ListView mListView; private long mAccountId; private final ArrayList<ParcelableUser> mData = new ArrayList<ParcelableUser>(); private volatile boolean mReachedBottom, mNotReachedBottomBefore = true; private Fragment mDetailFragment; private ParcelableUser mSelectedUser; private final BroadcastReceiver mStateReceiver = new BroadcastReceiver() { @Override public void onReceive(final Context context, final Intent intent) { final String action = intent.getAction(); if (BROADCAST_MULTI_SELECT_STATE_CHANGED.equals(action)) { mAdapter.setMultiSelectEnabled(mApplication.isMultiSelectActive()); } else if (BROADCAST_MULTI_SELECT_ITEM_CHANGED.equals(action)) { mAdapter.notifyDataSetChanged(); } } }; public long getAccountId() { return mAccountId; } public final ArrayList<ParcelableUser> getData() { return mData; } @Override public UsersAdapter getListAdapter() { return mAdapter; } public SharedPreferences getSharedPreferences() { return mPreferences; } public abstract Loader<List<ParcelableUser>> newLoaderInstance(); @Override public void onActivityCreated(final Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mApplication = getApplication(); mPreferences = getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE); mAdapter = new UsersAdapter(getActivity()); mListView = getListView(); final Bundle args = getArguments() != null ? getArguments() : new Bundle(); final long account_id = args.getLong(INTENT_KEY_ACCOUNT_ID, -1); if (mAccountId != account_id) { mAdapter.clear(); mData.clear(); } mAccountId = account_id; mListView.setOnItemClickListener(this); mListView.setOnItemLongClickListener(this); mListView.setOnScrollListener(this); if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) { mListView.setCacheColorHint(0); } setMode(Mode.BOTH); setListAdapter(mAdapter); getLoaderManager().initLoader(0, getArguments(), this); setListShown(false); } @Override public void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Tell the framework to try to keep this fragment around // during a configuration change. setRetainInstance(true); } @Override public Loader<List<ParcelableUser>> onCreateLoader(final int id, final Bundle args) { setProgressBarIndeterminateVisibility(true); return newLoaderInstance(); } @Override public void onItemClick(final AdapterView<?> adapter, final View view, final int position, final long id) { final ParcelableUser user = mAdapter.findItem(id); if (user == null) return; if (mApplication.isMultiSelectActive()) { final NoDuplicatesLinkedList<Object> list = mApplication.getSelectedItems(); if (!list.contains(user)) { list.add(user); } else { list.remove(user); } return; } openUserProfile(user.user_id, user.screen_name); } @Override public boolean onItemLongClick(final AdapterView<?> parent, final View view, final int position, final long id) { mSelectedUser = null; final UsersAdapter adapter = getListAdapter(); mSelectedUser = adapter.findItem(id); if (mApplication.isMultiSelectActive()) { final NoDuplicatesLinkedList<Object> list = mApplication.getSelectedItems(); if (!list.contains(mSelectedUser)) { list.add(mSelectedUser); } else { list.remove(mSelectedUser); } return true; } mPopupMenu = PopupMenu.getInstance(getActivity(), view); mPopupMenu.inflate(R.menu.action_user); mPopupMenu.setOnMenuItemClickListener(this); mPopupMenu.show(); return true; } @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(getActivatedAccountIds(getActivity()).length > 1); onRefreshComplete(); setListShown(true); } @Override public boolean onMenuItemClick(final MenuItem item) { if (mSelectedUser == null) return false; switch (item.getItemId()) { case MENU_VIEW_PROFILE: { openUserProfile(mSelectedUser.user_id, mSelectedUser.screen_name); break; } case MENU_EXTENSIONS: { final Intent intent = new Intent(INTENT_ACTION_EXTENSION_OPEN_USER); final Bundle extras = new Bundle(); extras.putParcelable(INTENT_KEY_USER, mSelectedUser); intent.putExtras(extras); startActivity(Intent.createChooser(intent, getString(R.string.open_with_extensions))); break; } case MENU_MULTI_SELECT: { if (!mApplication.isMultiSelectActive()) { mApplication.startMultiSelect(); } final NoDuplicatesLinkedList<Object> list = mApplication.getSelectedItems(); if (!list.contains(mSelectedUser)) { list.add(mSelectedUser); } break; } } return true; } @Override public void onPullDownToRefresh() { getLoaderManager().restartLoader(0, getArguments(), this); } @Override public void onPullUpToRefresh() { final int count = mAdapter.getCount(); if (count - 1 > 0) { final Bundle args = getArguments(); if (args != null) { args.putLong(INTENT_KEY_MAX_ID, mAdapter.getItem(count - 1).user_id); } if (!getLoaderManager().hasRunningLoaders()) { getLoaderManager().restartLoader(0, args, this); } } } @Override public void onResume() { super.onResume(); mLoadMoreAutomatically = mPreferences.getBoolean(PREFERENCE_KEY_LOAD_MORE_AUTOMATICALLY, false); final float text_size = mPreferences.getFloat(PREFERENCE_KEY_TEXT_SIZE, PREFERENCE_DEFAULT_TEXT_SIZE); final boolean display_profile_image = mPreferences.getBoolean(PREFERENCE_KEY_DISPLAY_PROFILE_IMAGE, true); final boolean display_name = mPreferences.getBoolean(PREFERENCE_KEY_DISPLAY_NAME, false); mAdapter.setMultiSelectEnabled(mApplication.isMultiSelectActive()); mAdapter.setDisplayProfileImage(display_profile_image); mAdapter.setTextSize(text_size); mAdapter.setDisplayName(display_name); mAdapter.notifyDataSetChanged(); } @Override public void onScroll(final AbsListView view, final int firstVisibleItem, final int visibleItemCount, final int totalItemCount) { final boolean reached = firstVisibleItem + visibleItemCount >= totalItemCount && totalItemCount >= visibleItemCount; if (mReachedBottom != reached) { mReachedBottom = reached; if (mReachedBottom && mNotReachedBottomBefore) { mNotReachedBottomBefore = false; return; } final int count = mAdapter.getCount(); if (mLoadMoreAutomatically && mReachedBottom && count > visibleItemCount) { onPullUpToRefresh(); } } } @Override public void onScrollStateChanged(final AbsListView view, final int scrollState) { } @Override public void onStart() { super.onStart(); final IntentFilter filter = new IntentFilter(); filter.addAction(BROADCAST_MULTI_SELECT_STATE_CHANGED); filter.addAction(BROADCAST_MULTI_SELECT_ITEM_CHANGED); registerReceiver(mStateReceiver, filter); } @Override public void onStop() { if (mPopupMenu != null) { mPopupMenu.dismiss(); } unregisterReceiver(mStateReceiver); super.onStop(); } protected void openUserProfile(final long user_id, final String screen_name) { final FragmentActivity activity = getActivity(); if (activity instanceof HomeActivity && ((HomeActivity) activity).isDualPaneMode()) { final HomeActivity home_activity = (HomeActivity) activity; if (mDetailFragment instanceof UserProfileFragment && mDetailFragment.isAdded()) { ((UserProfileFragment) mDetailFragment).getUserInfo(mAccountId, user_id, screen_name); } else { mDetailFragment = new UserProfileFragment(); final Bundle args = new Bundle(); args.putLong(INTENT_KEY_ACCOUNT_ID, mAccountId); args.putLong(INTENT_KEY_USER_ID, user_id); args.putString(INTENT_KEY_SCREEN_NAME, screen_name); mDetailFragment.setArguments(args); home_activity.showAtPane(HomeActivity.PANE_RIGHT, mDetailFragment, true); } } else { final Uri.Builder builder = new Uri.Builder(); builder.scheme(SCHEME_TWEETINGS); builder.authority(AUTHORITY_USER); builder.appendQueryParameter(QUERY_PARAM_ACCOUNT_ID, String.valueOf(mAccountId)); builder.appendQueryParameter(QUERY_PARAM_USER_ID, String.valueOf(user_id)); builder.appendQueryParameter(QUERY_PARAM_SCREEN_NAME, screen_name); startActivity(new Intent(Intent.ACTION_VIEW, builder.build())); } } }