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Using the Cell Phone s GPS Functionality
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</LinearLayout> <LinearLayout xmlns:android=http://schemasandroidcom/apk/res/android android:layout_width="wrap_content" android:layout_height="wrap_content" > <TextView android:id="@+id/lngLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Longitude: " /> <TextView android:id="@+id/lngText" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout> <view class="comgoogleandroidmapsMapView" android:id="@+id/myMap" android:layout_width="wrap_content" android:layout_height="wrap_content"/> </LinearLayout>
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Because you are embedding the MapView within this Activity, you need to change the definition of your class Currently, your main class extends Activity However, to properly work with the Google MapView, you must extend MapActivity Therefore, you need to import the MapActivity package and replace the Activity package with it in your header Import the following packages:
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import import import import comgoogleandroidmapsMapActivity; comgoogleandroidmapsMapView; comgoogleandroidmapsPoint; comgoogleandroidmapsMapController;
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The Point package will be used to hold point values that represent map coordinates, whereas the MapController will center the map to your Point These two packages are critical for using the MapView Now you are ready to add the code that will establish the map and pass your coordinates to it First, set up a MapView and assign it the layout from mainxml:
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MapView myMap = (MapView) findViewById(RidmyMap);
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Next, set up a Point and assign it the latPoint and lngPoint values that you retrieved from the GPS:
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Point myLocation = new Point(latPointintValue(),lngPointintValue());
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Now you can create your MapController, which will be used to move the focus of the Google Map to the location you just defined in the Point Use the getController( ) method from the MapView to establish a controller in your specific Map:
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MapController myMapController = myMapgetController();
The only job left is to use the controller to move the map to your location (to make the map a little more recognizable, set the zoom to 9):
myMapControllercenterMapTo(myLocation, false); myMapControllerzoomTo(9);
What you have just written is all the code needed to utilize Google Maps from your Activity The full class should look like this:
package android_programmers_guideAndroidLBS; import import import import import import import import import import androidosBundle; androidlocationLocationManager; androidviewView; androidwidgetTextView; androidcontentContext; androidwidgetButton; comgoogleandroidmapsMapActivity; comgoogleandroidmapsMapView; comgoogleandroidmapsPoint; comgoogleandroidmapsMapController;
public class AndroidLBS extends MapActivity { /** Called when the activity is first created */ @Override public void onCreate(Bundle icicle) { superonCreate(icicle); setContentView(Rlayoutmain); final Button gpsButton = (Button) findViewById(RidgpsButton); gpsButtonsetOnClickListener(new ButtonOnClickListener() { public void onClick(View v){ LoadProviders(); }}); }
9:
Using the Cell Phone s GPS Functionality
public void LoadProviders(){ TextView latText = (TextView) findViewById(RidlatText); TextView lngText = (TextView) findViewById(RidlngText); LocationManager myManager = (LocationManager) getSystemService(ContextLOCATION_SERVICE); Double latPoint = myManagergetCurrentLocation("gps")getLatitude()*1E6; Double lngPoint = myManagergetCurrentLocation("gps")getLongitude()*1E6; latTextsetText(latPointtoString()); lngTextsetText(lngPointtoString()); MapView myMap = (MapView) findViewById(RidmyMap); Point myLocation = new Point(latPointintValue(),lngPointintValue()); MapController myMapController = myMapgetController(); myMapControllercenterMapTo(myLocation, false); myMapControllerzoomTo(9); } }
Run the Activity in the Emulator The Activity should open to a blank map, as shown in the following illustration
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Click the Where Am I button and you should see the map focus to, and zoom in on, San Francisco Take a look at the following illustration to see how your map should appear
Adding Zoom Controls
For your last exercise in this chapter, you will add two more buttons to your AndroidLBS Activity These buttons will control the zoom in and zoom out methods of the Google MapView What makes this modification a little different is that I will introduce a new type of layout for your mainxml file: the RelativeLayout Whereas LinearLayouts allow you to place Views directly, one after the other, RelativeLayouts let you place Views on top of each other For this Activity, you will be placing the two new buttons over the Google Map To achieve this effect, place the MapView within the RelativeLayout With the MapView in the RelativeLayout, you can add the buttons that will be placed over the map
<RelativeLayout xmlns:android="http://schemasandroidcom/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent"
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Using the Cell Phone s GPS Functionality
android:layout_height="fill_parent" > <view class="comgoogleandroidmapsMapView" android:id="@+id/myMap" android:layout_width="wrap_content" android:layout_height="wrap_content"/> </RelativeLayout>
Now you can add your two additional buttons Place the buttons so that they appear in the upper-left and lower-left corners of the MapView You need to make one change to the standard Button layout By default, the RelativeLayout adds the Button to align with the top edge of the anchor view, in this case, the MapView Therefore, in the layout, use the android:layout_alignBottom attribute and assign it the id of the MapView This will align the button to the bottom of the map
<Button android:id="@+id/buttonZoomIn" style=" android:attr/buttonStyleSmall" android:text="+" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <Button android:id="@+id/buttonZoomOut" style=" android:attr/buttonStyleSmall" android:text="-" android:layout_alignBottom="@+id/myMap" android:layout_width="wrap_content" android:layout_height="wrap_content" />
Take a close look at the layout attributes for the Button layout I use a new attribute, style, to make this Button a small button
Your full mainxml file should look like this:
< xml version="10" encoding="utf-8" > <LinearLayout xmlns:android="http://schemasandroidcom/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <Button android:id="@+id/gpsButton" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Where Am I" />
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