Java tutorial
/* Transportr * Copyright (C) 2013 - 2016 Torsten Grote * * 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 de.grobox.liberario.ui; import android.Manifest; import android.content.Context; import android.content.pm.PackageManager; import android.location.LocationListener; import android.location.LocationManager; import android.os.Bundle; import android.os.Parcelable; import android.support.v4.app.ActivityCompat; import android.support.v4.content.ContextCompat; import android.util.AttributeSet; import android.util.Log; import android.view.View; import android.view.animation.AlphaAnimation; import android.view.animation.Animation; import android.view.animation.LinearInterpolator; import android.widget.Toast; import java.util.List; import de.grobox.liberario.R; import de.grobox.liberario.WrapLocation; import de.grobox.liberario.utils.TransportrUtils; import de.schildbach.pte.dto.Location; import static de.grobox.liberario.WrapLocation.WrapType.GPS; public class LocationGpsView extends LocationView implements LocationListener { private final String SEARCHING = "searching"; private LocationManager locationManager; private LocationGpsListener gpsListener; private volatile boolean searching = false; private Location gps_location = null; protected int caller = 0; public LocationGpsView(Context context, AttributeSet attrs) { super(context, attrs); if (!isInEditMode()) { this.locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE); } getAdapter().setGPS(true); } @Override public Parcelable onSaveInstanceState() { Bundle bundle = (Bundle) super.onSaveInstanceState(); bundle.putBoolean(SEARCHING, searching); if (searching) { deactivateGPS(); } return bundle; } @Override public void onRestoreInstanceState(Parcelable state) { if (state instanceof Bundle) { Bundle bundle = (Bundle) state; if (bundle.getBoolean(SEARCHING)) { activateGPS(); // this pass over the LocationView's restoreInstanceState state = bundle.getParcelable(SUPER_STATE); } } super.onRestoreInstanceState(state); } @Override public void onLocationItemClick(WrapLocation loc, View view) { if (loc.getType() == GPS) { // prevent GPS fake name from being shown in the TextView ui.location.setText(""); activateGPS(); if (clickListener != null) clickListener.onLocationItemClick(view, loc); } else { super.onLocationItemClick(loc, view); } } @Override protected void onFocusChange(View v, boolean hasFocus) { if (!searching) super.onFocusChange(v, hasFocus); } @Override public void handleTextChanged(CharSequence s) { if (searching) { deactivateGPS(); } super.handleTextChanged(s); } @Override protected void clearLocationAndShowDropDown() { deactivateGPS(); super.clearLocationAndShowDropDown(); } @Override protected void onDetachedFromWindow() { deactivateGPS(); super.onDetachedFromWindow(); } public void setCaller(int caller) { this.caller = caller; } public void activateGPS() { if (searching) return; // check permissions if (ContextCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) { // Should we show an explanation? if (ActivityCompat.shouldShowRequestPermissionRationale(activity, Manifest.permission.ACCESS_FINE_LOCATION)) { Toast.makeText(getContext(), R.string.permission_denied_gps, Toast.LENGTH_LONG).show(); } else { // No explanation needed, we can request the permission ActivityCompat.requestPermissions(activity, new String[] { Manifest.permission.ACCESS_FINE_LOCATION }, caller); } return; } searching = true; List<String> providers = locationManager.getProviders(true); for (String provider : providers) { // Register the listener with the Location Manager to receive location updates locationManager.requestSingleUpdate(provider, this, null); Log.d(getClass().getSimpleName(), "Register provider for location updates: " + provider); } // check if there is a non-passive provider available if (providers.size() == 0 || (providers.size() == 1 && providers.get(0).equals(LocationManager.PASSIVE_PROVIDER))) { locationManager.removeUpdates(this); Toast.makeText(getContext(), getContext().getString(R.string.error_no_location_provider), Toast.LENGTH_LONG).show(); return; } // clear input setLocation(null, TransportrUtils.getTintedDrawable(getContext(), R.drawable.ic_gps)); ui.clear.setVisibility(View.VISIBLE); // clear current GPS location, because we are looking to find a new one gps_location = null; // show GPS button blinking final Animation animation = new AlphaAnimation(1, 0); animation.setDuration(500); animation.setInterpolator(new LinearInterpolator()); animation.setRepeatCount(Animation.INFINITE); animation.setRepeatMode(Animation.REVERSE); ui.status.startAnimation(animation); ui.location.setHint(R.string.stations_searching_position); ui.location.clearFocus(); if (gpsListener != null) gpsListener.activateGPS(); } public void deactivateGPS() { searching = false; if (ContextCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) { locationManager.removeUpdates(this); } // deactivate button ui.status.clearAnimation(); ui.location.setHint(hint); if (gpsListener != null) gpsListener.deactivateGPS(); } public boolean isSearching() { return searching; } public void onLocationChanged(Location location) { setLocation(location, TransportrUtils.getTintedDrawable(getContext(), R.drawable.ic_gps)); if (gpsListener != null) gpsListener.onLocationChanged(location); deactivateGPS(); } // Called when a new location is found by the network location provider. public void onLocationChanged(android.location.Location location) { // no more updates to prevent this method from being called more than once if (ContextCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) { locationManager.removeUpdates(this); } // only execute if we still do not have a location to make super sure this is not run twice if (gps_location == null) { Log.d(getClass().getSimpleName(), "Found location: " + location.toString()); int lat = (int) Math.round(location.getLatitude() * 1E6); int lon = (int) Math.round(location.getLongitude() * 1E6); // create location based on GPS coordinates gps_location = Location.coord(lat, lon); onLocationChanged(gps_location); } } @Override public void onStatusChanged(String provider, int status, Bundle extras) { } @Override public void onProviderEnabled(String provider) { } @Override public void onProviderDisabled(String provider) { } public void setLocationGpsListener(LocationGpsListener listener) { this.gpsListener = listener; } public interface LocationGpsListener { void activateGPS(); void deactivateGPS(); void onLocationChanged(Location location); } }