Android引路蜂地图开发示例：放大、缩小

RasterMap的 zoomIn,zoomOut 用来放大缩小地图。在项目GISEngineTutorial中创建MapZoom Activity。

package com.pstreets.gisengine.demo;
 
import com.mapdigit.gis.geometry.GeoLatLng;
import com.pstreets.gisengine.R;
import com.pstreets.gisengine.SharedMapInstance;
import com.mapdigit.gis.raster.MapType;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
 
public class MapZoom extends Activity {
 
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  
 
 }
 
 @Override
 public void onStart() {
  super.onStart();
  GeoLatLng center = new GeoLatLng(32.0616667, 118.7777778);
  SharedMapInstance.map.setCenter(center, 13, MapType.MICROSOFTCHINA);
 
 }
 
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  MenuInflater inflater = getMenuInflater();
  inflater.inflate(R.menu.mapzoom_menu, menu);
  return true;
 }
 
 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
  // Handle item selection
  switch (item.getItemId()) {
  case R.id.zoomin:
   SharedMapInstance.map.zoomIn();
 
   return true;
  case R.id.zoomout:
   SharedMapInstance.map.zoomOut();
   return true;
 
  default:
   return super.onOptionsItemSelected(item);
  }
 
 }
 
}