Java tutorial
/* * Copyright 2017 Oleksandr Finchuk * * This file is part of ClockPlus. * * ClockPlus 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. * * ClockPlus 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 ClockPlus. If not, see <http://www.gnu.org/licenses/>. */ package com.finchuk.clock2.timers.ui; import android.app.Activity; import android.content.Intent; import android.content.res.Configuration; import android.content.res.Resources; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v4.content.Loader; import android.support.v7.widget.GridLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import com.finchuk.clock2.timers.EditTimerActivity; import com.finchuk.clock2.timers.Timer; import com.finchuk.clock2.timers.data.AsyncTimersTableUpdateHandler; import com.finchuk.clock2.timers.data.TimerCursor; import com.finchuk.clock2.R; import com.finchuk.clock2.list.RecyclerViewFragment; import com.finchuk.clock2.timers.data.TimersListCursorLoader; import static butterknife.ButterKnife.findById; import static com.finchuk.clock2.util.ConfigurationUtils.getOrientation; public class TimersFragment extends RecyclerViewFragment<Timer, TimerViewHolder, TimerCursor, TimersCursorAdapter> { // TODO: Different number of columns for different display densities, instead of landscape. // Use smallest width qualifiers. I can imagine 3 or 4 columns for a large enough tablet in landscape. private static final int LANDSCAPE_LAYOUT_COLUMNS = 2; public static final int REQUEST_CREATE_TIMER = 0; public static final String EXTRA_SCROLL_TO_TIMER_ID = "com.finchuk.clock2.timers.extra.SCROLL_TO_TIMER_ID"; private AsyncTimersTableUpdateHandler mAsyncTimersTableUpdateHandler; @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); mAsyncTimersTableUpdateHandler = new AsyncTimersTableUpdateHandler(getActivity(), this); long scrollToStableId = getActivity().getIntent().getLongExtra(EXTRA_SCROLL_TO_TIMER_ID, -1); if (scrollToStableId != -1) { setScrollToStableId(scrollToStableId); } } @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view = super.onCreateView(inflater, container, savedInstanceState); final Resources r = getResources(); if (getOrientation(r) == Configuration.ORIENTATION_LANDSCAPE) { RecyclerView list = findById(view, R.id.list); int cardViewMargin = r.getDimensionPixelSize(R.dimen.cardview_margin); list.setPaddingRelative(cardViewMargin/*start*/, cardViewMargin/*top*/, 0, list.getPaddingBottom()); } return view; } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode != Activity.RESULT_OK || data == null) return; // TODO: From EditTimerActivity, pass back the Timer as a parcelable and // retrieve it here directly. int hour = data.getIntExtra(EditTimerActivity.EXTRA_HOUR, -1); int minute = data.getIntExtra(EditTimerActivity.EXTRA_MINUTE, -1); int second = data.getIntExtra(EditTimerActivity.EXTRA_SECOND, -1); String label = data.getStringExtra(EditTimerActivity.EXTRA_LABEL); boolean startTimer = data.getBooleanExtra(EditTimerActivity.EXTRA_START_TIMER, false); // TODO: Timer's group? Timer t = Timer.createWithLabel(hour, minute, second, label); if (startTimer) { t.start(); } mAsyncTimersTableUpdateHandler.asyncInsert(t); } @Override public void onFabClick() { Intent intent = new Intent(getActivity(), EditTimerActivity.class); startActivityForResult(intent, REQUEST_CREATE_TIMER); } @Override protected TimersCursorAdapter onCreateAdapter() { // Create a new adapter. This is called before we can initialize mAsyncTimersTableUpdateHandler, // so right now it is null. However, after super.onCreate() returns, it is initialized, and // the reference variable will be pointing to an actual object. This assignment "propagates" // to all references to mAsyncTimersTableUpdateHandler. return new TimersCursorAdapter(this, mAsyncTimersTableUpdateHandler); } @Override protected RecyclerView.LayoutManager getLayoutManager() { switch (getOrientation(getResources())) { case Configuration.ORIENTATION_LANDSCAPE: return new GridLayoutManager(getActivity(), LANDSCAPE_LAYOUT_COLUMNS); default: return super.getLayoutManager(); } } @Override protected int emptyMessage() { return R.string.empty_timers_container; } @Override protected int emptyIcon() { return R.drawable.ic_timer_96dp; } @Override public Loader<TimerCursor> onCreateLoader(int id, Bundle args) { return new TimersListCursorLoader(getActivity()); } @Override public void onListItemClick(Timer item, int position) { } @Override public void onListItemDeleted(Timer item) { } @Override public void onListItemUpdate(Timer item, int position) { } @Override protected void onScrolledToStableId(long id, int position) { } }