Java tutorial
/* * Copyright (C) 2011 University of Washington * * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except * in compliance with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software distributed under the License * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express * or implied. See the License for the specific language governing permissions and limitations under * the License. */ package com.geoodk.collect.android.activities; import java.text.DecimalFormat; import java.util.List; import com.geoodk.collect.android.R; import android.content.Context; import android.content.Intent; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; import com.geoodk.collect.android.application.Collect; import com.geoodk.collect.android.utilities.InfoLogger; import com.geoodk.collect.android.widgets.GeoPointWidget; import com.google.android.gms.maps.CameraUpdateFactory; import com.google.android.gms.maps.GoogleMap; import com.google.android.gms.maps.GoogleMap.OnMapLongClickListener; import com.google.android.gms.maps.GoogleMap.OnMarkerDragListener; import com.google.android.gms.maps.SupportMapFragment; import com.google.android.gms.maps.model.LatLng; import com.google.android.gms.maps.model.Marker; import com.google.android.gms.maps.model.MarkerOptions; /** * Version of the GeoPointMapActivity that uses the new Maps v2 API and Fragments to enable * specifying a location via placing a tracker on a map. * * @author guisalmon@gmail.com * */ public class GeoPointMapActivity extends FragmentActivity implements LocationListener, OnMarkerDragListener, OnMapLongClickListener { private static final String LOCATION_COUNT = "locationCount"; private GoogleMap mMap; private MarkerOptions mMarkerOption; private Marker mMarker; private LatLng mLatLng; private TextView mLocationStatus; private LocationManager mLocationManager; private Location mLocation; private Button mAcceptLocation; private Button mCancelLocation; private Button mReloadLocation; private boolean mCaptureLocation = true; private boolean mRefreshLocation = true; private boolean mIsDragged = false; private Button mShowLocation; private boolean mGPSOn = false; private boolean mNetworkOn = false; private double mLocationAccuracy; private int mLocationCount = 0; private boolean mZoomed = false; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (savedInstanceState != null) { mLocationCount = savedInstanceState.getInt(LOCATION_COUNT); } requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.geopoint_layout); Intent intent = getIntent(); mLocationAccuracy = GeoPointWidget.DEFAULT_LOCATION_ACCURACY; if (intent != null && intent.getExtras() != null) { if (intent.hasExtra(GeoPointWidget.LOCATION)) { double[] location = intent.getDoubleArrayExtra(GeoPointWidget.LOCATION); mLatLng = new LatLng(location[0], location[1]); } if (intent.hasExtra(GeoPointWidget.ACCURACY_THRESHOLD)) { mLocationAccuracy = intent.getDoubleExtra(GeoPointWidget.ACCURACY_THRESHOLD, GeoPointWidget.DEFAULT_LOCATION_ACCURACY); } mCaptureLocation = !intent.getBooleanExtra(GeoPointWidget.READ_ONLY, false); mRefreshLocation = mCaptureLocation; } /* Set up the map and the marker */ mMarkerOption = new MarkerOptions(); mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap(); mMap.setOnMarkerDragListener(this); mLocationStatus = (TextView) findViewById(R.id.location_status); /*Zoom only if there's a previous location*/ if (mLatLng != null) { mLocationStatus.setVisibility(View.GONE); mMarkerOption.position(mLatLng); mMarker = mMap.addMarker(mMarkerOption); mRefreshLocation = false; // just show this position; don't change it... mMarker.setDraggable(mCaptureLocation); mZoomed = true; mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(mLatLng, 16)); } mCancelLocation = (Button) findViewById(R.id.cancel_location); mCancelLocation.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Collect.getInstance().getActivityLogger().logInstanceAction(this, "cancelLocation", "cancel"); finish(); } }); mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); // make sure we have a good location provider before continuing List<String> providers = mLocationManager.getProviders(true); for (String provider : providers) { if (provider.equalsIgnoreCase(LocationManager.GPS_PROVIDER)) { mGPSOn = true; } if (provider.equalsIgnoreCase(LocationManager.NETWORK_PROVIDER)) { mNetworkOn = true; } } if (!mGPSOn && !mNetworkOn) { Toast.makeText(getBaseContext(), getString(R.string.provider_disabled_error), Toast.LENGTH_SHORT) .show(); finish(); } if (mGPSOn) { Location loc = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER); if (loc != null) { InfoLogger.geolog("GeoPointMapActivity: " + System.currentTimeMillis() + " lastKnownLocation(GPS) lat: " + loc.getLatitude() + " long: " + loc.getLongitude() + " acc: " + loc.getAccuracy()); } else { InfoLogger.geolog("GeoPointMapActivity: " + System.currentTimeMillis() + " lastKnownLocation(GPS) null location"); } } if (mNetworkOn) { Location loc = mLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER); if (loc != null) { InfoLogger.geolog("GeoPointMapActivity: " + System.currentTimeMillis() + " lastKnownLocation(Network) lat: " + loc.getLatitude() + " long: " + loc.getLongitude() + " acc: " + loc.getAccuracy()); } else { InfoLogger.geolog("GeoPointMapActivity: " + System.currentTimeMillis() + " lastKnownLocation(Network) null location"); } } mAcceptLocation = (Button) findViewById(R.id.accept_location); if (mCaptureLocation) { mAcceptLocation.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Collect.getInstance().getActivityLogger().logInstanceAction(this, "acceptLocation", "OK"); returnLocation(); } }); mMap.setOnMapLongClickListener(this); } else { mAcceptLocation.setVisibility(View.GONE); } mReloadLocation = (Button) findViewById(R.id.reload_location); if (mCaptureLocation) { mReloadLocation.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { mRefreshLocation = true; mReloadLocation.setVisibility(View.GONE); mLocationStatus.setVisibility(View.VISIBLE); if (mGPSOn) { mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, GeoPointMapActivity.this); } if (mNetworkOn) { mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, GeoPointMapActivity.this); } } }); mReloadLocation.setVisibility(!mRefreshLocation ? View.VISIBLE : View.GONE); } else { mReloadLocation.setVisibility(View.GONE); } // Focuses on marked location mShowLocation = ((Button) findViewById(R.id.show_location)); mShowLocation.setVisibility(View.VISIBLE); mShowLocation.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Collect.getInstance().getActivityLogger().logInstanceAction(this, "showLocation", "onClick"); mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(mLatLng, 16)); } }); mShowLocation.setClickable(mMarker != null); } private void stopGeolocating() { mRefreshLocation = false; mReloadLocation.setVisibility(View.VISIBLE); mLocationManager.removeUpdates(this); mMarker.setDraggable(true); mLocationStatus.setVisibility(View.GONE); } @Override protected void onStart() { super.onStart(); Collect.getInstance().getActivityLogger().logOnStart(this); } @Override protected void onStop() { Collect.getInstance().getActivityLogger().logOnStop(this); super.onStop(); } private void returnLocation() { if (mIsDragged) { Log.i(getClass().getName(), "IsDragged !!!"); Intent i = new Intent(); i.putExtra(FormEntryActivity.LOCATION_RESULT, mLatLng.latitude + " " + mLatLng.longitude + " " + 0 + " " + 0); setResult(RESULT_OK, i); } else if (mLocation != null) { Log.i(getClass().getName(), "IsNotDragged !!!"); Intent i = new Intent(); i.putExtra(FormEntryActivity.LOCATION_RESULT, mLocation.getLatitude() + " " + mLocation.getLongitude() + " " + mLocation.getAltitude() + " " + mLocation.getAccuracy()); setResult(RESULT_OK, i); } finish(); } private String truncateFloat(float f) { return new DecimalFormat("#.##").format(f); } @Override protected void onPause() { super.onPause(); mLocationManager.removeUpdates(this); } @Override protected void onResume() { super.onResume(); if (mRefreshLocation) { mLocationStatus.setVisibility(View.VISIBLE); if (mGPSOn) { mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this); } if (mNetworkOn) { mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this); } } } @Override public void onLocationChanged(Location location) { if (mRefreshLocation) { mLocation = location; if (mLocation != null) { // Bug report: cached GeoPoint is being returned as the first value. // Wait for the 2nd value to be returned, which is hopefully not cached? ++mLocationCount; InfoLogger.geolog("GeoPointMapActivity: " + System.currentTimeMillis() + " onLocationChanged(" + mLocationCount + ") lat: " + mLocation.getLatitude() + " long: " + mLocation.getLongitude() + " acc: " + mLocation.getAccuracy()); if (mLocationCount > 1) { mLocationStatus.setText(getString(R.string.location_provider_accuracy, mLocation.getProvider(), truncateFloat(mLocation.getAccuracy()))); mLatLng = new LatLng(mLocation.getLatitude(), mLocation.getLongitude()); if (!mZoomed) { mZoomed = true; mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(mLatLng, 16)); } else { mMap.animateCamera(CameraUpdateFactory.newLatLng(mLatLng)); } // create a marker on the map or move the existing marker to the // new location if (mMarker == null) { mMarkerOption.position(mLatLng); mMarker = mMap.addMarker(mMarkerOption); mShowLocation.setClickable(true); } else { mMarker.setPosition(mLatLng); } //If location is accurate enough, stop updating position and make the marker draggable if (mLocation.getAccuracy() <= mLocationAccuracy) { stopGeolocating(); } } } else { InfoLogger.geolog("GeoPointMapActivity: " + System.currentTimeMillis() + " onLocationChanged(" + mLocationCount + ") null location"); } } } @Override public void onProviderDisabled(String provider) { } @Override public void onProviderEnabled(String provider) { } @Override public void onStatusChanged(String provider, int status, Bundle extras) { } @Override public void onMarkerDrag(Marker arg0) { } @Override public void onMarkerDragEnd(Marker marker) { mLatLng = marker.getPosition(); mAcceptLocation.setClickable(true); mIsDragged = true; mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(mLatLng, mMap.getCameraPosition().zoom)); } @Override public void onMarkerDragStart(Marker arg0) { stopGeolocating(); } @Override public void onMapLongClick(LatLng latLng) { if (mMarker == null) { mMarkerOption.position(latLng); mMarker = mMap.addMarker(mMarkerOption); mShowLocation.setClickable(true); } else { mMarker.setPosition(latLng); } mLatLng = latLng; mIsDragged = true; stopGeolocating(); mMarker.setDraggable(true); } }