minigmap.java

简单的java代码实现手机地图功能

package lordhong.apps;

import java.util.ArrayList;
import java.util.List;

import org.xml.sax.SAXException;

import lordhong.apps.DBHelper.AddressRow;
import android.os.Bundle;
import android.util.Log;
import android.util.Xml;
import android.view.KeyEvent;
import android.view.View;
import android.view.Window;
import android.view.View.OnKeyListener;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;

import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.Point;

public class MiniGMap extends MapActivity {
	
	private static MapView mapview;
	private static AutoCompleteTextView address;
	private DBHelper dbHelper;
	private ArrayList<String> addresses;
	private static final String LOGGER = "lordhong.miniGmap";
	
    /** 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);
        
        ToolBar.setup(this);
        mapview = (MapView)findViewById(R.id.mapview);
        address = (AutoCompleteTextView)findViewById(R.id.address);
        address.setKeyListener(new OnKeyListener() {

			public boolean onKey(View v, int keyCode, KeyEvent event) {
				if (keyCode==KeyEvent.KEYCODE_DPAD_CENTER) {
					// get value from address auto-complete
					String addr = address.getText().toString();
					Log.i(LOGGER, "addr: " + addr);
					// get lat. and long. from db
					DBHelper.AddressRow row = dbHelper.fetchRow(addr);
					if (row.rowId!=-1) {
						// navigate to geo location
						navigateToGeoCode(row.latitude, row.longitude);
					} else {
						// address not found, maybe a new address?
						try {
							String yahooGeoResponse = YahooGeoAPI.getGeoCode(addr);
							YahooGeocodeHandler handler = new YahooGeocodeHandler();
							try {
			                    Xml.parse(yahooGeoResponse, handler);
			                } catch (SAXException e) {
			                    Log.e(LOGGER, e.toString(), e);
			                }
			                Log.i(LOGGER, "latitude: " + handler.getLatitude());
			                Log.i(LOGGER, "Longitude: " + handler.getLongitude());
			                if (handler.getLatitudeAsLong()!=-1 && handler.getLongitudeAsLong()!=-1) {
			                	dbHelper.createRow(addr, handler.getLatitudeAsLong(), handler.getLongitudeAsLong());
			                	navigateToGeoCode(handler.getLatitudeAsLong(), handler.getLongitudeAsLong());
			                	// re-populate the addresses, including the new address
			                	populateAddresses();
			                }
						} catch (Exception e) {
							Log.e(LOGGER, "addr error from yahoo geo lookup: " + addr, e);
						}
						
						//Log.i("lordhong.miniGmap", "NOT FOUND!: " + addr);
					}
				}
				return false;
			}
        	
        });
        dbHelper = new DBHelper(this);
        populateAddresses();
    }
    
    public static void zoomIn() {
    	mapview.getController().zoomTo(mapview.getZoomLevel() + 1);
    }
    
    public static void zoomOut() {
    	mapview.getController().zoomTo(mapview.getZoomLevel() - 1);
    }
    
    public static void satellite() {
    	mapview.toggleSatellite();
    }
    
    public static void traffic() {
    	mapview.toggleTraffic();
    }
    
    public static void enterAddress() {
    	address.requestFocus();
    	address.setSelectAllOnFocus(true);
    }
    
    private void navigateToGeoCode(long latitude, long longitude) {
    	Log.i(LOGGER, latitude+"--"+longitude);
    	Point p = new Point((int)latitude, (int)longitude);
		MapController mc = mapview.getController();
		mc.animateTo(p);
		mc.zoomTo(21);
    }
    
    public void populateAddresses() {
    	addresses = new ArrayList<String>();
    	
    	List<AddressRow> rows = dbHelper.fetchAllRows();
    	for (AddressRow row : rows) {
    		addresses.add(row.address);
    	}
    	
    	ArrayAdapter<String> addressAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, addresses);
    	address.setAdapter(addressAdapter);
    }
}