Basic Android App using Google Maps and Current Location

Applies to:
  • Android Studio (Beta) 0.8.6
  • Google Android Maps API

I am writing an app for a tablet running Android and wanted to include a Google Map. The following exercise focuses solely on creating an app which opens Google Maps at your current location.

I couldn't find any instructions using the tools I had (Android Studio) which is why I've written this article.
  1. Start "Android Studio"

  2. Go to File and create a New Project...

  3. I'm developing on a Tablet so I select Phone and Tablet then a relatively old version of the Android OS:

  4. Add an activity to Mobile: select Google Maps Activity:

  5. Change the Title to what you want (don't change the activity or layout) and click on Finish:

  6. Get yourself a developers' Google Android Maps API Key (not necessarily the same as Google API Key) and enter it as instructed:

  7. Change the Java file to open on your current location, find the file and open it:

  8. Change the function setUpMap() to the following code
    private void setUpMap() {
            mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker").snippet("Snippet"));
            // Enable MyLocation Layer of Google Map
            // Get LocationManager object from System Service LOCATION_SERVICE
            LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
            // Create a criteria object to retrieve provider
            Criteria criteria = new Criteria();
            // Get the name of the best provider
            String provider = locationManager.getBestProvider(criteria, true);
            // Get Current Location
            Location myLocation = locationManager.getLastKnownLocation(provider);
            // set map type
            // Get latitude of the current location
            double latitude = myLocation.getLatitude();
            // Get longitude of the current location
            double longitude = myLocation.getLongitude();
            // Create a LatLng object for the current location
            LatLng latLng = new LatLng(latitude, longitude);
            // Show the current location in Google Map
            // Zoom in the Google Map
            mMap.addMarker(new MarkerOptions().position(new LatLng(latitude, longitude)).title("You are here!").snippet("Consider yourself located"));
    1.  private void setUpMap() { 
    2.          mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker").snippet("Snippet"))
    4.          // Enable MyLocation Layer of Google Map 
    5.          mMap.setMyLocationEnabled(true)
    7.          // Get LocationManager object from System Service LOCATION_SERVICE 
    8.          LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE)
    10.          // Create a criteria object to retrieve provider 
    11.          Criteria criteria = new Criteria()
    13.          // Get the name of the best provider 
    14.          String provider = locationManager.getBestProvider(criteria, true)
    16.          // Get Current Location 
    17.          Location myLocation = locationManager.getLastKnownLocation(provider)
    19.          // set map type 
    20.          mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL)
    22.          // Get latitude of the current location 
    23.          double latitude = myLocation.getLatitude()
    25.          // Get longitude of the current location 
    26.          double longitude = myLocation.getLongitude()
    28.          // Create a LatLng object for the current location 
    29.          LatLng latLng = new LatLng(latitude, longitude)
    31.          // Show the current location in Google Map 
    32.          mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng))
    34.          // Zoom in the Google Map 
    35.          mMap.animateCamera(CameraUpdateFactory.zoomTo(14))
    36.          mMap.addMarker(new MarkerOptions().position(new LatLng(latitude, longitude)).title("You are here!").snippet("Consider yourself located"))
    37.      } 
    1. If you are prompted to import the classes then agree by clicking OK:

    2. If you are not prompted,
      1. you should see some of your code go red like in the following screenshot:

      2. Focus the cursor on the word and hold down the key and press Enter, then import each class:

  9. Your code will now include the imported classes near the beginning, so TEST it!

Problems animating the camera to your current location? I had to add the following:
LatLng myCoordinates = new LatLng(latitude, longitude);
CameraUpdate yourLocation = CameraUpdateFactory.newLatLngZoom(myCoordinates, 12);
  1.  LatLng myCoordinates = new LatLng(latitude, longitude)
  2.  CameraUpdate yourLocation = CameraUpdateFactory.newLatLngZoom(myCoordinates, 12)
  3.  mMap.animateCamera(yourLocation)

Additional Additional:
A little more control on the animation?
CameraPosition cameraPosition = new CameraPosition.Builder()
    .target(myCoordinates)      // Sets the center of the map to LatLng (refer to previous snippet)
    .zoom(17)                   // Sets the zoom
    .bearing(90)                // Sets the orientation of the camera to east
    .tilt(30)                   // Sets the tilt of the camera to 30 degrees
    .build();                   // Creates a CameraPosition from the builder
  1.  CameraPosition cameraPosition = new CameraPosition.Builder() 
  2.      .target(myCoordinates)      // Sets the center of the map to LatLng (refer to previous snippet) 
  3.      .zoom(17)                   // Sets the zoom 
  4.      .bearing(90)                // Sets the orientation of the camera to east 
  5.      .tilt(30)                   // Sets the tilt of the camera to 30 degrees 
  6.      .build();                   // Creates a CameraPosition from the builder 
  7.  map.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition))

Just in case: AndroidManifest.xml
The example above should have populated this correctly but if you are still getting problems, I have the following fields that I also use related to Google Maps v2:
        android:value="@integer/google_play_services_version" />
        android:value="@string/google_maps_key" />
        android:protectionLevel="signature" />
        android:required="true" />
        android:name="" />
        android:name="" />
        android:name="android.permission.INTERNET" />
        android:name="" />
        android:name="android.permission.ACCESS_COARSE_LOCATION" />
        android:name="android.permission.ACCESS_FINE_LOCATION" />
  1.  <meta-data 
  2.          android:name="" 
  3.          android:value="@integer/google_play_services_version" /> 
  4.  <meta-data 
  5.          android:name="" 
  6.          android:value="@string/google_maps_key" /> 
  7.  <permission 
  8.          android:name="" 
  9.          android:protectionLevel="signature" /> 
  10.  <uses-feature 
  11.          android:glEsVersion="0x00020000" 
  12.          android:required="true" /> 
  13.  <uses-library 
  14.          android:name="" /> 
  15.  <uses-permission 
  16.          android:name="" /> 
  17.  <uses-permission 
  18.          android:name="android.permission.INTERNET" /> 
  19.  <uses-permission 
  20.          android:name="" /> 
  21.  <uses-permission 
  22.          android:name="android.permission.ACCESS_COARSE_LOCATION" /> 
  23.  <uses-permission 
  24.          android:name="android.permission.ACCESS_FINE_LOCATION" /> 

Last Additional
Ensure that when Google asks for your Android API key, you enter the production key (which may be the same as your testing key); the one from your app and not from your computer (as other people don't use your computer to access the service). If your fellow testers only see a grey map, just double-check the key is the right one given to Google Maps.

Follow On Article/Sequel
Next: Article on separating the map into a sub-activity rather than it being the main activity - Android OS: Add GoogleMap as fragment.

Category: AndroidOS :: Article: 585

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Joel Lipman

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