Java tutorial
package com.mycompany.hw4; import android.content.Intent; import android.location.Address; import android.os.Parcelable; import android.support.v4.app.FragmentActivity; import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import com.google.android.gms.maps.CameraUpdateFactory; import com.google.android.gms.maps.GoogleMap; import com.google.android.gms.maps.MapFragment; import com.google.android.gms.maps.MapView; import com.google.android.gms.maps.SupportMapFragment; import com.google.android.gms.maps.model.CameraPosition; import com.google.android.gms.maps.model.LatLng; import com.google.android.gms.maps.model.Marker; import com.google.android.gms.maps.model.MarkerOptions; import com.google.android.gms.maps.model.PolylineOptions; import java.util.ArrayList; public class Maps extends FragmentActivity { private GoogleMap map; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_maps); setUpMapIfNeeded(); //createMap(); } @Override protected void onResume() { super.onResume(); setUpMapIfNeeded(); // map.setMapType(GoogleMap.MAP_TYPE_HYBRID); // createMap(); } /** * Sets up the map if it is possible to do so (i.e., the Google Play services APK is correctly * installed) and the map has not already been instantiated.. This will ensure that we only ever * call {@link #setUpMap()} once when {@link #map} is not null. * <p> * If it isn't installed {@link SupportMapFragment} (and * {@link com.google.android.gms.maps.MapView MapView}) will show a prompt for the user to * install/update the Google Play services APK on their device. * <p> * A user can return to this FragmentActivity after following the prompt and correctly * installing/updating/enabling the Google Play services. Since the FragmentActivity may not * have been completely destroyed during this process (it is likely that it would only be * stopped or paused), {@link #onCreate(Bundle)} may not be called again so we should call this * method in {@link #onResume()} to guarantee that it will be called. */ /* * Copyright (C) 2012 The Android Open Source Project * * 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. */ private void setUpMapIfNeeded() { // Do a null check to confirm that we have not already instantiated the map. if (map == null) { // Try to obtain the map from the SupportMapFragment. map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap(); // Check if we were successful in obtaining the map. if (map != null) { Intent intent = getIntent(); if (intent.getIntExtra(MainActivity.EXTRA_MESSAGE, 0) == 4) map.setMapType(GoogleMap.MAP_TYPE_HYBRID); if (intent.getIntExtra(MainActivity.EXTRA_MESSAGE, 0) == 3) map.setMapType(GoogleMap.MAP_TYPE_TERRAIN); if (intent.getIntExtra(MainActivity.EXTRA_MESSAGE, 0) == 2) map.setMapType(GoogleMap.MAP_TYPE_SATELLITE); setUpMap(); } } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } private void setUpMap() { Intent intent = getIntent(); ArrayList<Parcelable> addresses = (ArrayList<Parcelable>) intent.getExtras() .getParcelableArrayList(MainActivity.LOCATION_MESSAGE); LatLng location = new LatLng(0, 0); PolylineOptions polyOpt = new PolylineOptions().geodesic(true).color(0xDDEE3333); for (Parcelable parcel : addresses) { Address address = (Address) parcel; location = new LatLng(address.getLatitude(), address.getLongitude()); polyOpt.add(location); String marker; if (address.getFeatureName() != null) { marker = address.getFeatureName(); } else if (address.getAddressLine(0) != null) { marker = address.getAddressLine(0); } else { marker = "Marker"; } String snip = address.getLatitude() + " " + address.getLongitude() + ""; map.addMarker(new MarkerOptions().position(location).title(marker).snippet(snip)); } map.animateCamera(CameraUpdateFactory.newCameraPosition(new CameraPosition(location, 14, 45, 0))); map.addPolyline(polyOpt); map.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() { @Override public boolean onMarkerClick(Marker marker) { map.animateCamera( CameraUpdateFactory.newCameraPosition(new CameraPosition(marker.getPosition(), 14, 45, 0))); marker.showInfoWindow(); return true; } }); } }