Java tutorial
/* * Androzic - android navigation client that uses OziExplorer maps (ozf2, ozfx3). * Copyright (C) 2010-2014 Andrey Novikov <http://andreynovikov.info/> * * This file is part of Androzic application. * * Androzic 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. * Androzic 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 Androzic. If not, see <http://www.gnu.org/licenses/>. */ package com.androzic.track; import java.util.Date; import java.util.Locale; import android.app.Activity; import android.content.res.Resources; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.support.design.widget.FloatingActionButton; import android.support.v4.app.Fragment; import android.support.v7.app.AppCompatActivity; import android.text.format.DateFormat; import android.text.format.DateUtils; 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 android.widget.TextView; import com.androzic.Androzic; import com.androzic.FragmentHolder; import com.androzic.R; import com.androzic.data.Track; import com.androzic.util.Geo; import com.androzic.util.MeanValue; import com.androzic.util.StringFormatter; public class TrackDetails extends Fragment { private FragmentHolder fragmentHolderCallback; private OnTrackActionListener trackActionsCallback; private Track track; private Drawable fabDrawable; private FloatingActionButton fab; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setRetainInstance(true); setHasOptionsMenu(true); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.track_details, container, false); } @Override public void onAttach(Activity activity) { super.onAttach(activity); // This makes sure that the container activity has implemented // the callback interface. If not, it throws an exception try { fragmentHolderCallback = (FragmentHolder) activity; } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement FragmentHolder"); } try { trackActionsCallback = (OnTrackActionListener) activity; } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement OnTrackActionListener"); } } @Override public void onStart() { super.onStart(); if (track != null) updateTrackDetails(); } @Override public void onResume() { super.onResume(); fab = fragmentHolderCallback.enableActionButton(); fabDrawable = fab.getDrawable(); fab.setImageResource(R.drawable.ic_visibility_white_24dp); fab.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { trackActionsCallback.onTrackView(track); } }); } @Override public void onPause() { super.onPause(); fab.setImageDrawable(fabDrawable); fragmentHolderCallback.disableActionButton(); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.track_menu, menu); super.onCreateOptionsMenu(menu, inflater); } @Override public void onPrepareOptionsMenu(final Menu menu) { menu.findItem(R.id.action_view).setVisible(false); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.action_edit: trackActionsCallback.onTrackEdit(track); return true; case R.id.action_edit_path: trackActionsCallback.onTrackEditPath(track); return true; case R.id.action_track_to_route: trackActionsCallback.onTrackToRoute(track); return true; case R.id.action_save: trackActionsCallback.onTrackSave(track); return true; case R.id.action_remove: Androzic application = Androzic.getApplication(); application.removeTrack(track); // "Close" fragment getFragmentManager().popBackStack(); return true; } return false; } public void setTrack(Track track) { this.track = track; if (isVisible()) { updateTrackDetails(); } } private void updateTrackDetails() { AppCompatActivity activity = (AppCompatActivity) getActivity(); Resources resources = getResources(); activity.getSupportActionBar().setTitle(track.name); View view = getView(); int pointCount = track.getPointCount(); ((TextView) view.findViewById(R.id.point_count)) .setText(resources.getQuantityString(R.plurals.numberOfPoints, pointCount, pointCount)); String distance = StringFormatter.distanceH(track.distance); ((TextView) view.findViewById(R.id.distance)).setText(distance); Track.TrackPoint ftp = track.getPoint(0); Track.TrackPoint ltp = track.getLastPoint(); String start_coords = StringFormatter.coordinates(" ", ftp.latitude, ftp.longitude); ((TextView) view.findViewById(R.id.start_coordinates)).setText(start_coords); String finish_coords = StringFormatter.coordinates(" ", ltp.latitude, ltp.longitude); ((TextView) view.findViewById(R.id.finish_coordinates)).setText(finish_coords); Date start_date = new Date(ftp.time); ((TextView) view.findViewById(R.id.start_date)) .setText(DateFormat.getDateFormat(activity).format(start_date) + " " + DateFormat.getTimeFormat(activity).format(start_date)); Date finish_date = new Date(ltp.time); ((TextView) view.findViewById(R.id.finish_date)) .setText(DateFormat.getDateFormat(activity).format(finish_date) + " " + DateFormat.getTimeFormat(activity).format(finish_date)); long elapsed = (ltp.time - ftp.time) / 1000; String timeSpan; if (elapsed < 24 * 60 * 60 * 3) { timeSpan = DateUtils.formatElapsedTime(elapsed); } else { timeSpan = DateUtils.formatDateRange(activity, ftp.time, ltp.time, DateUtils.FORMAT_ABBREV_MONTH); } ((TextView) view.findViewById(R.id.time_span)).setText(timeSpan); // Gather statistics int segmentCount = 0; double minElevation = Double.MAX_VALUE; double maxElevation = Double.MIN_VALUE; double maxSpeed = 0; MeanValue mv = new MeanValue(); for (Track.TrackSegment segment : track.getSegments()) { Track.TrackPoint ptp = null; if (segment.independent) segmentCount++; for (Track.TrackPoint tp : segment.getPoints()) { if (ptp != null) { double d = Geo.distance(tp.latitude, tp.longitude, ptp.latitude, ptp.longitude); double speed = d / ((tp.time - ptp.time) / 1000); if (speed == Double.POSITIVE_INFINITY) continue; mv.addValue(speed); if (speed > maxSpeed) maxSpeed = speed; } ptp = tp; if (tp.elevation < minElevation && tp.elevation != 0) minElevation = tp.elevation; if (tp.elevation > maxElevation) maxElevation = tp.elevation; } } double averageSpeed = mv.getMeanValue(); ((TextView) view.findViewById(R.id.segment_count)) .setText(resources.getQuantityString(R.plurals.numberOfSegments, segmentCount, segmentCount)); ((TextView) view.findViewById(R.id.max_elevation)).setText(StringFormatter.elevationH(maxElevation)); ((TextView) view.findViewById(R.id.min_elevation)).setText(StringFormatter.elevationH(minElevation)); ((TextView) view.findViewById(R.id.max_speed)).setText(String.format(Locale.getDefault(), "%s: %s", resources.getString(R.string.max_speed), StringFormatter.speedH(maxSpeed))); ((TextView) view.findViewById(R.id.average_speed)).setText(String.format(Locale.getDefault(), "%s: %s", resources.getString(R.string.average_speed), StringFormatter.speedH(averageSpeed))); } }