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Android: A Programmer s Guide
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<LinearLayout xmlns:android="http://schemasandroidcom/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" > <TextView android:id="@+id/latLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Latitude: " /> <TextView android:id="@+id/latText" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </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> <RelativeLayout xmlns:android="http://schemasandroidcom/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <view class="comgoogleandroidmapsMapView" android:id="@+id/myMap" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <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="-"
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android:layout_alignBottom="@+id/myMap" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </RelativeLayout> </LinearLayout>
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You are going to make a few modifications to the code Aside from adding the code for the new views, you need to move some existing code around To make your Activity more flexible, you need to move the instantiations of the MapView and MapController to the main part of the class This will allow you to then pass those items into other functions as needed (like those you will create for the zoom in and zoom out features)
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final MapView myMap = (MapView) findViewById(RidmyMap); final MapController myMapController = myMapgetController();
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Now you can create the code for the two new buttons Create the buttons as you have done in the past, adding calls to functions you will build next:
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final Button zoomIn = (Button) findViewById(RidbuttonZoomIn); zoomInsetOnClickListener(new ButtonOnClickListener() { public void onClick(View v){ ZoomIn(myMap,myMapController); }}); final Button zoomOut = (Button) findViewById(RidbuttonZoomOut); zoomOutsetOnClickListener(new ButtonOnClickListener() { public void onClick(View v){ ZoomOut(myMap,myMapController); }});
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Finally, create the functions that will control the zoom in and zoom out feature The maximum zoom in level is 21 and the minimum is 1 Therefore, in your function, test for the current level before adjusting This will ensure that you do not run into any problems
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public void ZoomIn(MapView mv, MapController mc){ if(mvgetZoomLevel()!=21){ mczoomTo(mvgetZoomLevel()+ 1); } } public void ZoomOut(MapView mv, MapController mc){ if(mvgetZoomLevel()!=1){ mczoomTo(mvgetZoomLevel()- 1); } }
Android: A Programmer s Guide
Notice that you pass the MapView and MapController into the functions From there, it is simply Integer manipulation to set the zoom level The only tricky part of this function is that the MapController physically moves the MapView to the desired zoom level, whereas the MapView itself holds the zoom value
Think of this relationship as being similar to that between a remote control and a television The remote control tunes the TV to channel 5, but the channel itself is stored on the TV
Your completed AndroidLBSjava file 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 MapView myMap = (MapView) findViewById(RidmyMap); final MapController myMapController = myMapgetController(); final Button zoomIn = (Button) findViewById(RidbuttonZoomIn); zoomInsetOnClickListener(new ButtonOnClickListener() { public void onClick(View v){ ZoomIn(myMap,myMapController); }}); final Button zoomOut = (Button) findViewById(RidbuttonZoomOut); zoomOutsetOnClickListener(new ButtonOnClickListener() { public void onClick(View v){ ZoomOut(myMap,myMapController); }}); final Button gpsButton = (Button) findViewById(RidgpsButton); gpsButtonsetOnClickListener(new ButtonOnClickListener() { public void onClick(View v){ LoadProviders(myMap,myMapController); }});
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public void LoadProviders(MapView mv, MapController mc){ 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()); Point myLocation = new Point(latPointintValue(),lngPointintValue()); mccenterMapTo(myLocation, false); mczoomTo(9); } public void ZoomIn(MapView mv, MapController mc){ if(mvgetZoomLevel()!=21){ mczoomTo(mvgetZoomLevel()+ 1); } } public void ZoomOut(MapView mv, MapController mc){ if(mvgetZoomLevel()!=1){ mczoomTo(mvgetZoomLevel()- 1); } } }
Run this Activity in your Android Emulator The Activity should open to a reset MapView, with the buttons placed as shown in the following illustration
Android: A Programmer s Guide
Test the zoom in and zoom out buttons When you zoom in, you should see something that looks similar to the following illustration
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Toggling Between MapView s Standard and Satellite Views
Edit the AndroidLBS Activity one more time You should add two more buttons to the RelativeLayout These buttons should toggle the MapView between standard view and satellite view Here are some points to consider:
Add the toggle buttons to the opposite corners of the MapView using the align layout attributes Research the MapView to find the toggling method Create a function that you can pass the MapView to and toggle it The complete text of solution mainxml and AndroidLBSjava are as follows
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