Java tutorial
/* * Twidere - Twitter client for Android * * Copyright (C) 2012-2015 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.mariotaku.twidere.fragment; import android.content.Context; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.v4.app.LoaderManager; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.Loader; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.KeyEvent; import org.mariotaku.twidere.adapter.ParcelableUserListsAdapter; import org.mariotaku.twidere.adapter.iface.ILoadMoreSupportAdapter.IndicatorPosition; import org.mariotaku.twidere.adapter.iface.IUserListsAdapter.UserListClickListener; import org.mariotaku.twidere.loader.iface.ICursorSupportLoader; import org.mariotaku.twidere.loader.iface.IExtendedLoader; import org.mariotaku.twidere.model.ParcelableUserList; import org.mariotaku.twidere.model.UserKey; import org.mariotaku.twidere.util.IntentUtils; import org.mariotaku.twidere.util.KeyboardShortcutsHandler; import org.mariotaku.twidere.util.KeyboardShortcutsHandler.KeyboardShortcutCallback; import org.mariotaku.twidere.util.RecyclerViewNavigationHelper; import org.mariotaku.twidere.view.holder.UserListViewHolder; import java.util.List; public abstract class ParcelableUserListsFragment extends AbsContentListRecyclerViewFragment<ParcelableUserListsAdapter> implements LoaderCallbacks<List<ParcelableUserList>>, UserListClickListener, KeyboardShortcutCallback { private RecyclerViewNavigationHelper mNavigationHelper; private long mNextCursor; private long mPrevCursor; @Override public boolean isRefreshing() { if (getContext() == null || isDetached()) return false; final LoaderManager lm = getLoaderManager(); return lm.hasRunningLoaders(); } @NonNull @Override protected final ParcelableUserListsAdapter onCreateAdapter(Context context) { return new ParcelableUserListsAdapter(context); } @Override protected void setupRecyclerView(Context context, RecyclerView recyclerView) { super.setupRecyclerView(context, recyclerView); } @Nullable protected UserKey getAccountKey() { final Bundle args = getArguments(); return args.getParcelable(EXTRA_ACCOUNT_KEY); } protected boolean hasMoreData(List<ParcelableUserList> data) { return data == null || !data.isEmpty(); } public void onLoadFinished(Loader<List<ParcelableUserList>> loader, List<ParcelableUserList> data) { final ParcelableUserListsAdapter adapter = getAdapter(); adapter.setData(data); if (!(loader instanceof IExtendedLoader) || ((IExtendedLoader) loader).isFromUser()) { adapter.setLoadMoreSupportedPosition( hasMoreData(data) ? IndicatorPosition.END : IndicatorPosition.NONE); setRefreshEnabled(true); } if (loader instanceof IExtendedLoader) { ((IExtendedLoader) loader).setFromUser(false); } if (loader instanceof ICursorSupportLoader) { mNextCursor = ((ICursorSupportLoader) loader).getNextCursor(); mPrevCursor = ((ICursorSupportLoader) loader).getNextCursor(); } showContent(); setRefreshEnabled(true); setRefreshing(false); setLoadMoreIndicatorPosition(IndicatorPosition.NONE); } @Override public void onLoadMoreContents(@IndicatorPosition int position) { // Only supports load from end, skip START flag if ((position & IndicatorPosition.START) != 0) return; super.onLoadMoreContents(position); if (position == 0) return; final Bundle loaderArgs = new Bundle(getArguments()); loaderArgs.putBoolean(EXTRA_FROM_USER, true); loaderArgs.putLong(EXTRA_NEXT_CURSOR, getNextCursor()); getLoaderManager().restartLoader(0, loaderArgs, this); } protected void removeUsers(long... ids) { //TODO remove from adapter } public final List<ParcelableUserList> getData() { return getAdapter().getData(); } @Override public boolean handleKeyboardShortcutSingle(@NonNull KeyboardShortcutsHandler handler, int keyCode, @NonNull KeyEvent event, int metaState) { return mNavigationHelper.handleKeyboardShortcutSingle(handler, keyCode, event, metaState); } @Override public boolean handleKeyboardShortcutRepeat(@NonNull KeyboardShortcutsHandler handler, int keyCode, int repeatCount, @NonNull KeyEvent event, int metaState) { return mNavigationHelper.handleKeyboardShortcutRepeat(handler, keyCode, repeatCount, event, metaState); } @Override public boolean isKeyboardShortcutHandled(@NonNull KeyboardShortcutsHandler handler, int keyCode, @NonNull KeyEvent event, int metaState) { return mNavigationHelper.isKeyboardShortcutHandled(handler, keyCode, event, metaState); } @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); final ParcelableUserListsAdapter adapter = getAdapter(); final RecyclerView recyclerView = getRecyclerView(); final LinearLayoutManager layoutManager = getLayoutManager(); adapter.setUserListClickListener(this); mNavigationHelper = new RecyclerViewNavigationHelper(recyclerView, layoutManager, adapter, this); final Bundle loaderArgs = new Bundle(getArguments()); loaderArgs.putBoolean(EXTRA_FROM_USER, true); getLoaderManager().initLoader(0, loaderArgs, this); } @Override public final Loader<List<ParcelableUserList>> onCreateLoader(int id, Bundle args) { final boolean fromUser = args.getBoolean(EXTRA_FROM_USER); args.remove(EXTRA_FROM_USER); return onCreateUserListsLoader(getActivity(), args, fromUser); } @Override public void onLoaderReset(Loader<List<ParcelableUserList>> loader) { if (loader instanceof IExtendedLoader) { ((IExtendedLoader) loader).setFromUser(false); } } @Override public void onUserListClick(UserListViewHolder holder, int position) { final ParcelableUserList userList = getAdapter().getUserList(position); if (userList == null) return; IntentUtils.openUserListDetails(getActivity(), userList); } public long getPrevCursor() { return mPrevCursor; } public long getNextCursor() { return mNextCursor; } @Override public boolean onUserListLongClick(UserListViewHolder holder, int position) { return true; } protected abstract Loader<List<ParcelableUserList>> onCreateUserListsLoader(Context context, Bundle args, boolean fromUser); }