Java tutorial
/** * MainActivityTrackFragment.java * Implements the track fragment used in the track tab of the main activity * This fragment displays a saved track * * This file is part of * TRACKBOOK - Movement Recorder for Android * * Copyright (c) 2016-17 - Y20K.org * Licensed under the MIT-License * http://opensource.org/licenses/MIT * * Trackbook uses osmdroid - OpenStreetMap-Tools for Android * https://github.com/osmdroid/osmdroid */ package org.y20k.trackbook; import android.app.Activity; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.location.Location; import android.os.AsyncTask; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.design.widget.BottomSheetBehavior; import android.support.v4.app.DialogFragment; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.content.LocalBroadcastManager; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ImageButton; import android.widget.LinearLayout; import android.widget.Spinner; import android.widget.TextView; import org.osmdroid.api.IMapController; import org.osmdroid.tileprovider.tilesource.TileSourceFactory; import org.osmdroid.util.GeoPoint; import org.osmdroid.views.MapView; import org.osmdroid.views.overlay.ItemizedIconOverlay; import org.osmdroid.views.overlay.compass.CompassOverlay; import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider; import org.y20k.trackbook.core.Track; import org.y20k.trackbook.helpers.DialogHelper; import org.y20k.trackbook.helpers.DropdownAdapter; import org.y20k.trackbook.helpers.ExportHelper; import org.y20k.trackbook.helpers.LogHelper; import org.y20k.trackbook.helpers.MapHelper; import org.y20k.trackbook.helpers.StorageHelper; import org.y20k.trackbook.helpers.TrackbookKeys; import java.io.File; import java.text.DateFormat; import java.util.Locale; /** * MainActivityTrackFragment class */ public class MainActivityTrackFragment extends Fragment implements AdapterView.OnItemSelectedListener, TrackbookKeys { /* Define log tag */ private static final String LOG_TAG = MainActivityTrackFragment.class.getSimpleName(); /* Main class variables */ private FragmentActivity mActivity; private View mRootView; private MapView mMapView; private LinearLayout mOnboardingView; private IMapController mController; private ItemizedIconOverlay mTrackOverlay; private DropdownAdapter mDropdownAdapter; private LinearLayout mTrackManagementLayout; private Spinner mDropdown; private TextView mDistanceView; private TextView mStepsView; private TextView mWaypointsView; private TextView mDurationView; private TextView mRecordingStartView; private TextView mRecordingStopView; private BottomSheetBehavior mStatisticsSheetBehavior; private int mCurrentTrack; private Track mTrack; private BroadcastReceiver mTrackSavedReceiver; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // action bar has options menu setHasOptionsMenu(true); // store activity mActivity = getActivity(); // get current track if (savedInstanceState != null) { mCurrentTrack = savedInstanceState.getInt(INSTANCE_CURRENT_TRACK, 0); } else { mCurrentTrack = 0; } // create drop-down adapter mDropdownAdapter = new DropdownAdapter(mActivity); // listen for finished save operation mTrackSavedReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { if (intent.hasExtra(EXTRA_SAVE_FINISHED) && intent.getBooleanExtra(EXTRA_SAVE_FINISHED, false)) { LogHelper.v(LOG_TAG, "Save operation detected. Start loading the new track."); // update dropdown menu (and load track in onItemSelected) mDropdownAdapter.refresh(); mDropdownAdapter.notifyDataSetChanged(); mDropdown.setAdapter(mDropdownAdapter); mDropdown.setSelection(0, true); } } }; IntentFilter trackSavedReceiverIntentFilter = new IntentFilter(ACTION_TRACK_SAVE); LocalBroadcastManager.getInstance(mActivity).registerReceiver(mTrackSavedReceiver, trackSavedReceiverIntentFilter); } @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { // inflate root view from xml mRootView = inflater.inflate(R.layout.fragment_main_track, container, false); // get reference to onboarding layout mOnboardingView = (LinearLayout) mRootView.findViewById(R.id.track_tab_onboarding); // get reference to basic map mMapView = (MapView) mRootView.findViewById(R.id.track_map); // get map controller mController = mMapView.getController(); // basic map setup mMapView.setTileSource(TileSourceFactory.MAPNIK); mMapView.setTilesScaledToDpi(true); // add multi-touch capability mMapView.setMultiTouchControls(true); // add compass to map CompassOverlay compassOverlay = new CompassOverlay(mActivity, new InternalCompassOrientationProvider(mActivity), mMapView); compassOverlay.enableCompass(); // move the compass overlay down a bit compassOverlay.setCompassCenter(35.0f, 80.0f); mMapView.getOverlays().add(compassOverlay); // initiate map state if (savedInstanceState != null) { // restore saved instance of map GeoPoint position = new GeoPoint( savedInstanceState.getDouble(INSTANCE_LATITUDE_TRACK_MAP, DEFAULT_LATITUDE), savedInstanceState.getDouble(INSTANCE_LONGITUDE_TRACK_MAP, DEFAULT_LONGITUDE)); mController.setCenter(position); mController.setZoom(savedInstanceState.getInt(INSTANCE_ZOOM_LEVEL_MAIN_MAP, 16)); } else { mController.setZoom(16); } // get views for track selector mTrackManagementLayout = (LinearLayout) mRootView.findViewById(R.id.track_management_layout); mDropdown = (Spinner) mRootView.findViewById(R.id.track_selector); // attach listeners to export and delete buttons ImageButton exportButton = (ImageButton) mRootView.findViewById(R.id.export_button); ImageButton deleteButton = (ImageButton) mRootView.findViewById(R.id.delete_button); exportButton.setOnClickListener(getExportButtonListener()); deleteButton.setOnClickListener(getDeleteButtonListener()); // get views for statistics sheet View statisticsView = mRootView.findViewById(R.id.statistics_view); View statisticsSheet = mRootView.findViewById(R.id.statistics_sheet); mDistanceView = (TextView) mRootView.findViewById(R.id.statistics_data_distance); mStepsView = (TextView) mRootView.findViewById(R.id.statistics_data_steps); mWaypointsView = (TextView) mRootView.findViewById(R.id.statistics_data_waypoints); mDurationView = (TextView) mRootView.findViewById(R.id.statistics_data_duration); mRecordingStartView = (TextView) mRootView.findViewById(R.id.statistics_data_recording_start); mRecordingStopView = (TextView) mRootView.findViewById(R.id.statistics_data_recording_stop); // display map and statistics if (savedInstanceState != null) { // get track from saved instance and display map and statistics mTrack = savedInstanceState.getParcelable(INSTANCE_TRACK_TRACK_MAP); displayTrack(); } else if (mTrack == null) { // load track and display map and statistics LoadTrackAsyncHelper loadTrackAsyncHelper = new LoadTrackAsyncHelper(); loadTrackAsyncHelper.execute(); } else { // just display map and statistics displayTrack(); } // set up and show statistics sheet mStatisticsSheetBehavior = BottomSheetBehavior.from(statisticsSheet); mStatisticsSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED); mStatisticsSheetBehavior.setBottomSheetCallback(getStatisticsSheetCallback()); statisticsView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (mStatisticsSheetBehavior.getState() == BottomSheetBehavior.STATE_EXPANDED) { mStatisticsSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED); } else { mStatisticsSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED); } } }); return mRootView; } @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); mDropdown.setAdapter(mDropdownAdapter); mDropdown.setOnItemSelectedListener(this); } @Override public void onResume() { super.onResume(); // show / hide the onboarding layout switchOnboardingLayout(); } @Override public void onPause() { super.onPause(); } @Override public void onDestroyView() { super.onDestroyView(); // deactivate map mMapView.onDetach(); } @Override public void onDestroy() { LogHelper.v(LOG_TAG, "onDestroy called."); // remove listener LocalBroadcastManager.getInstance(mActivity).unregisterReceiver(mTrackSavedReceiver); super.onDestroy(); } @Override public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) { // update current track mCurrentTrack = i; // load track and display map and statistics LoadTrackAsyncHelper loadTrackAsyncHelper = new LoadTrackAsyncHelper(); loadTrackAsyncHelper.execute(i); } @Override public void onNothingSelected(AdapterView<?> adapterView) { } @Override public void onSaveInstanceState(Bundle outState) { outState.putDouble(INSTANCE_LATITUDE_TRACK_MAP, mMapView.getMapCenter().getLatitude()); outState.putDouble(INSTANCE_LONGITUDE_TRACK_MAP, mMapView.getMapCenter().getLongitude()); outState.putInt(INSTANCE_ZOOM_LEVEL_TRACK_MAP, mMapView.getZoomLevel()); outState.putParcelable(INSTANCE_TRACK_TRACK_MAP, mTrack); outState.putInt(INSTANCE_CURRENT_TRACK, mCurrentTrack); super.onSaveInstanceState(outState); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); switch (requestCode) { case RESULT_DELETE_DIALOG: if (resultCode == Activity.RESULT_OK) { LogHelper.v(LOG_TAG, "Delete dialog result: DELETE"); } else if (resultCode == Activity.RESULT_CANCELED) { LogHelper.v(LOG_TAG, "Delete dialog result: CANCEL"); } break; case RESULT_EXPORT_DIALOG: if (resultCode == Activity.RESULT_OK) { // User chose EXPORT ExportHelper exportHelper = new ExportHelper(mActivity); exportHelper.exportToGpx(mTrack); } else if (resultCode == Activity.RESULT_CANCELED) { // User chose CANCEL LogHelper.v(LOG_TAG, "Export to GPX: User chose CANCEL."); } break; } } /* Displays map and statistics for track */ private void displayTrack() { GeoPoint position; if (mTrack != null) { // set end of track as position Location lastLocation = mTrack.getWayPointLocation(mTrack.getSize() - 1); position = new GeoPoint(lastLocation.getLatitude(), lastLocation.getLongitude()); String recordingStart = DateFormat.getDateInstance(DateFormat.SHORT, Locale.getDefault()) .format(mTrack.getRecordingStart()) + " " + DateFormat.getTimeInstance(DateFormat.SHORT, Locale.getDefault()) .format(mTrack.getRecordingStart()); String recordingStop = DateFormat.getDateInstance(DateFormat.SHORT, Locale.getDefault()) .format(mTrack.getRecordingStop()) + " " + DateFormat.getTimeInstance(DateFormat.SHORT, Locale.getDefault()) .format(mTrack.getRecordingStop()); // populate views mDistanceView.setText(mTrack.getTrackDistance()); mStepsView.setText(String.valueOf(Math.round(mTrack.getStepCount()))); mWaypointsView.setText(String.valueOf(mTrack.getWayPoints().size())); mDurationView.setText(mTrack.getTrackDuration()); mRecordingStartView.setText(recordingStart); mRecordingStopView.setText(recordingStop); // draw track on map drawTrackOverlay(mTrack); } else { position = new GeoPoint(DEFAULT_LATITUDE, DEFAULT_LONGITUDE); } // center map over position mController.setCenter(position); } /* Draws track onto overlay */ private void drawTrackOverlay(Track track) { mMapView.getOverlays().remove(mTrackOverlay); mTrackOverlay = MapHelper.createTrackOverlay(mActivity, track, false); mMapView.getOverlays().add(mTrackOverlay); } /* show the onboarding layout, if no track has been recorded yet */ private void switchOnboardingLayout() { if (mDropdownAdapter.isEmpty()) { // show onboarding layout mMapView.setVisibility(View.GONE); mOnboardingView.setVisibility(View.VISIBLE); mTrackManagementLayout.setVisibility(View.INVISIBLE); mStatisticsSheetBehavior.setState(BottomSheetBehavior.STATE_HIDDEN); } else { // show normal layout mOnboardingView.setVisibility(View.GONE); mMapView.setVisibility(View.VISIBLE); mTrackManagementLayout.setVisibility(View.VISIBLE); mStatisticsSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED); } } /* Creates BottomSheetCallback for the statistics sheet - needed in onCreateView */ private BottomSheetBehavior.BottomSheetCallback getStatisticsSheetCallback() { return new BottomSheetBehavior.BottomSheetCallback() { @Override public void onStateChanged(@NonNull View bottomSheet, int newState) { // react to state change switch (newState) { case BottomSheetBehavior.STATE_EXPANDED: // statistics sheet expanded mTrackManagementLayout.setVisibility(View.INVISIBLE); break; case BottomSheetBehavior.STATE_COLLAPSED: // statistics sheet collapsed mTrackManagementLayout.setVisibility(View.VISIBLE); mStatisticsSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED); break; case BottomSheetBehavior.STATE_HIDDEN: // statistics sheet hidden mStatisticsSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED); break; default: break; } } @Override public void onSlide(@NonNull View bottomSheet, float slideOffset) { // react to dragging events if (slideOffset < 0.5f) { mTrackManagementLayout.setVisibility(View.VISIBLE); } else { mTrackManagementLayout.setVisibility(View.INVISIBLE); } } }; } /* Creates OnClickListener for the delete button - needed in onCreateView */ private View.OnClickListener getDeleteButtonListener() { return new View.OnClickListener() { @Override public void onClick(View view) { // get text elements for delete dialog int dialogTitle = R.string.dialog_delete_title; String dialogMessage = getString(R.string.dialog_delete_content) + " " + mTrack.getTrackDuration() + " | " + mTrack.getTrackDistance(); int dialogPositiveButton = R.string.dialog_delete_action_delete; int dialogNegativeButton = R.string.dialog_default_action_cancel; // show delete dialog - results are handles by onActivityResult DialogFragment dialogFragment = DialogHelper.newInstance(dialogTitle, dialogMessage, dialogPositiveButton, dialogNegativeButton); dialogFragment.setTargetFragment(MainActivityTrackFragment.this, RESULT_DELETE_DIALOG); dialogFragment.show(mActivity.getSupportFragmentManager(), "DeleteDialog"); } }; } /* Creates OnClickListener for the export button - needed in onCreateView */ private View.OnClickListener getExportButtonListener() { return new View.OnClickListener() { @Override public void onClick(View view) { // dialog text components int dialogTitle; String dialogMessage; int dialogPositiveButton; int dialogNegativeButton; // create an ExportHelper final ExportHelper exportHelper = new ExportHelper(mActivity); // get text elements for delete dialog if (exportHelper.gpxFileExists(mTrack)) { // CASE: OVERWRITE - GPX file exists dialogTitle = R.string.dialog_export_title_overwrite; dialogMessage = getString(R.string.dialog_export_content_overwrite) + " (" + mTrack.getTrackDuration() + " | " + mTrack.getTrackDistance() + ")"; dialogPositiveButton = R.string.dialog_export_action_overwrite; dialogNegativeButton = R.string.dialog_default_action_cancel; } else { // CASE: EXPORT - GPX file does NOT yet exits dialogTitle = R.string.dialog_export_title_export; dialogMessage = getString(R.string.dialog_export_content_export) + " (" + mTrack.getTrackDuration() + " | " + mTrack.getTrackDistance() + ")"; dialogPositiveButton = R.string.dialog_export_action_export; dialogNegativeButton = R.string.dialog_default_action_cancel; } // show delete dialog - results are handles by onActivityResult DialogFragment dialogFragment = DialogHelper.newInstance(dialogTitle, dialogMessage, dialogPositiveButton, dialogNegativeButton); dialogFragment.setTargetFragment(MainActivityTrackFragment.this, RESULT_EXPORT_DIALOG); dialogFragment.show(mActivity.getSupportFragmentManager(), "ExportDialog"); } }; } /** * Inner class: Loads track from external storage using AsyncTask */ private class LoadTrackAsyncHelper extends AsyncTask<Integer, Void, Void> { @Override protected Void doInBackground(Integer... ints) { LogHelper.v(LOG_TAG, "Loading track object in background."); StorageHelper storageHelper = new StorageHelper(mActivity); if (ints.length > 0) { // get track file from dropdown adapter int item = ints[0]; File trackFile = mDropdownAdapter.getItem(item).getTrackFile(); LogHelper.v(LOG_TAG, "Loading track number " + item); mTrack = storageHelper.loadTrack(trackFile); } else { // load track object from most current file LogHelper.v(LOG_TAG, "No specific track specified. Loading most current one."); mTrack = storageHelper.loadTrack(FILE_MOST_CURRENT_TRACK); } return null; } @Override protected void onPostExecute(Void aVoid) { super.onPostExecute(aVoid); // display track on map displayTrack(); } } /** * End of inner class */ }