AndroidでのGoogle APIを使った地図表示

public class TutorialOnMaps extends MapActivity {
   private static MapView mMapView;

   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle icicle) {
      super.onCreate(icicle);

      requestWindowFeature(Window.FEATURE_NO_TITLE);
      setContentView(R.layout.main);

      // Get the map view from resource file
      mMapView = (MapView)findViewById(R.id.mv);
      }
   }

<?xml version="1.0" encoding="utf-8"?>

<FrameLayout xmlns:android=
   "http://schemas.android.com/apk/res/android"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   >

<view id="@+id/mv"
   class="com.google.android.maps.MapView"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:layout_weight="1" />

<LinearLayout xmlns:android=
   "http://schemas.android.com/apk/res/android"
   android:orientation="horizontal"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:background="#550000ff"
   android:padding="2px"
   >
<Button id="@+id/sat"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_marginLeft="40px"
   android:text="Satellite" />
(...snipped)
</LinearLayout>

<LinearLayout xmlns:android=
   "http://schemas.android.com/apk/res/android"
   android:orientation="vertical"
   android:layout_width="wrap_content"
   android:layout_height="fill_parent"
   android:background="#550000ff"
   android:padding="2px"
   >
<Button id="@+id/zin"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_marginTop="30px"
   android:text="+" />
(...snipped)
</LinearLayout>

</FrameLayout>

// Set up the button for "Pan East"
mPanE = (Button)findViewById(R.id.pane);
mPanE.setOnClickListener(new OnClickListener(){
   // @Override
   public void onClick(View arg0) {
      panEast();
   }
});

public void panEast() {
   Point pt = new Point(
      mMapView.getMapCenter().getLatitudeE6(),
      mMapView.getMapCenter().getLongitudeE6()
         + mMapView.getLongitudeSpan() / 4);
   mMapView.getController().centerMapTo(pt, true);
   }

public void zoomIn() {
   mMapView.getController().zoomTo(mMapView.getZoomLevel() + 1);
   }

public void toggleSatellite() {
    mMapView.toggleSatellite();
}

public void toggleTraffic() {
    mMapView.toggleTraffic();
}

// This is used draw an overlay on the map
protected class MyOverlay extends Overlay {
   @Override
   public void draw(Canvas canvas, PixelCalculator pc,
                    boolean shadow) {
      super.draw(canvas, pc, shadow);

      if (mDefCaption.length() == 0) {
         return;
      }

      Paint p = new Paint();
      int[] scoords = new int[2];
      int sz = 5;

      // Convert to screen coords
      pc.getPointXY(mDefPoint, scoords);

      // Draw point caption and its bounding rectangle
      p.setTextSize(14);
      p.setAntiAlias(true);
      int sw = (int)(p.measureText(mDefCaption) + 0.5f);
      int sh = 25;
      int sx = scoords[0] - sw / 2 - 5;
      int sy = scoords[1] - sh - sz - 2;
      RectF rec = new RectF(sx, sy, sx + sw + 10, sy + sh);

      p.setStyle(Style.FILL);
      p.setARGB(128, 255, 0, 0);
      canvas.drawRoundRect(rec, 5, 5, p);
      p.setStyle(Style.STROKE);
      p.setARGB(255, 255, 255, 255);
      canvas.drawRoundRect(rec, 5, 5, p);

      canvas.drawText(mDefCaption, sx + 5, sy + sh - 8, p);

      // Draw point body and outer ring
      p.setStyle(Style.FILL);
      p.setARGB(88, 255, 0, 0);
      p.setStrokeWidth(1);
      RectF spot = new RectF(scoords[0] - sz, scoords[1] + sz,
         scoords[0] + sz, scoords[1] - sz);
      canvas.drawOval(spot, p);

      p.setARGB(255, 255, 0, 0);
      p.setStyle(Style.STROKE);
      canvas.drawCircle(scoords[0], scoords[1], sz, p);
   }
}

// Set up the overlay controller
mOverlayController = mMapView.createOverlayController();
MyOverlay mo = new MyOverlay();
mOverlayController.add(mo, true);

private void centerOnGPSPosition() {
   String provider = "gps";
   LocationManager lm =
      (LocationManager)getSystemService(Context.LOCATION_SERVICE);

   // NOTE: When LocationManager is called the first time,
   //       lat / lon is initialized to 0.
   //       Subsequent calls are fine and fast.
   Location loc = lm.getCurrentLocation(provider);

   mDefPoint = new Point((int)(loc.getLatitude()  * 1000000),
                         (int)(loc.getLongitude() * 1000000));
   mDefCaption = "GPS location";

   mMapView.getController().animateTo(mDefPoint);
   mMapView.getController().centerMapTo(mDefPoint, true);
}