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我正在開發將顯示用戶 當前的位置也顯示醫生在靠近 由他在谷歌map.I開發一個 演示應用程序，它可以找到任何位置 ，把一個標記就可以了，但我不知道一個應用程序如何在 附近找到存儲在數據庫中的地址。如何在Google地圖上存儲在我的數據庫中的醫生地址附近搜索？
**My XML File:**
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:layout_width="fill_parent"
android:layout_alignParentBottom="true"
android:layout_height="wrap_content"
android:orientation="vertical">
<EditText
android:layout_width="fill_parent"
android:id="@+id/location"
android:layout_height="wrap_content"
android:text="White House" />
<Button
android:id="@+id/geocodeBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Find Location" />
</LinearLayout>
<com.google.android.maps.MapView
android:id="@+id/mapview"
android:layout_width="fill_parent"
android:layout_height="320px"
android:clickable="true"
android:apiKey=Z1oyeAgSpj5vGQVD6ADrUI2622o7yfJVJ3vEOA"
/>
</RelativeLayout>
**Manifest File:**
<?xml version="1.0" encoding="utf-8"?>
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
package="pkg.Map"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="7" />
<application
android:icon="@drawable/icon"
android:label="@string/app_name">
<uses-library
android:name="com.google.android.maps">
</uses-library>
<activity
android:name="pkg.GeoCoderWithMarkers.GeoCoder"
android:label="@string/app_name">
<intent-filter>
<action
android:name="android.intent.action.MAIN" />
<category
android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission
android:name="android.permission.INTERNET"/>
<uses-permission
android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission
android:name="android.permission.ACCESS_COARSE_LOCATION"/>
</manifest>
和Java文件：
package pkg.GeoCoderWithMarkers;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import pkg.Map.R;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.location.Address;
import android.location.Geocoder;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.MyLocationOverlay;
import com.google.android.maps.OverlayItem;
public class GeoCoder extends MapActivity {
private MapController mapController;
private MapView mapView;
GeoPoint p,p1;
private MyLocationOverlay me=null;
private LocationManager locationManager;
private Geocoder geocoder = null;
int lat;
int lng;
//** Called when the activity is first created. *//*
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mapView = (MapView)findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true);
GeoPoint pt = new GeoPoint((int)(5.34079*1000000),
(int)(100.28241*1000000));
mapView.getController().setZoom(10);
mapView.setStreetView(true);
mapView.getController().setCenter(pt);
Button geoBtn =(Button)findViewById(R.id.geocodeBtn);
geocoder = new Geocoder(this);
final Drawable marker=getResources().getDrawable
(R.drawable.pushpin_blue);
int markerWidth = marker.getIntrinsicWidth();
int markerHeight = marker.getIntrinsicHeight();
marker.setBounds(0, markerHeight, markerWidth, 0);
MyItemizedOverlay myItemizedOverlay =
new MyItemizedOverlay(marker);
mapView.getOverlays().add(myItemizedOverlay);
GeoPoint myPoint1 = new GeoPoint(lat,
(int)(100.28241*1000000));
myItemizedOverlay.addItem(myPoint1,
"myPoint1", "myPoint1");
GeoPoint myPoint2 = new GeoPoint
(50*1000000, 50*1000000);
myItemizedOverlay.addItem
(myPoint2, "myPoint2", "myPoint2");
geoBtn.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
try {
EditText loc =
(EditText)findViewById(R.id.location);
String locationName = loc.getText().toString();
List<Address> addressList =
geocoder.getFromLocationName
(locationName, 5);
if(addressList!=null && addressList.size()>0)
{
int lat = (int)(addressList.get(0).
getLatitude()*1000000);
int lng = (int)(addressList.get(0).
getLongitude()*1000000);
GeoPoint pt = new GeoPoint(lat,lng);
mapView.getController().setZoom(17);
mapView.getController().setCenter(pt);
MyItemizedOverlay myItemizedOverlay =
new MyItemizedOverlay(marker);
mapView.getOverlays().add(myItemizedOverlay);
GeoPoint myPoint1 = new GeoPoint(lat, lng);
myItemizedOverlay.addItem
(myPoint1, "myPoint1", "myPoint1");
// GeoPoint myPoint2 = new GeoPoint
(50*1000000, 50*1000000);
// myItemizedOverlay.addItem
(myPoint2, "myPoint2", "myPoint2");
}
} catch (IOException e) {
e.printStackTrace();
}
}});
}
@Override
protected boolean isRouteDisplayed() {
return false;
}
}
class MyItemizedOverlay extends
ItemizedOverlay<OverlayItem>{
private ArrayList<OverlayItem>
overlayItemList = new ArrayList<OverlayItem>();
public MyItemizedOverlay(Drawable marker) {
super(boundCenterBottom(marker));
// TODO Auto-generated constructor stub
populate();
}
public void addItem(GeoPoint p,
String title, String snippet){
OverlayItem newItem =
new OverlayItem(p, title, snippet);
overlayItemList.add(newItem);
populate();
}
@Override
protected OverlayItem createItem(int i) {
// TODO Auto-generated method stub
return overlayItemList.get(i);
}
@Override
public int size() {
// TODO Auto-generated method stub
return overlayItemList.size();
}
@Override
public void draw(Canvas canvas,
MapView mapView, boolean shadow) {
// TODO Auto-generated method stub
super.draw(canvas, mapView, shadow);
//boundCenterBottom(marker);
}
}
你的數據庫是否包含緯度和經度等字段？如果是這樣，您可以獲取當前的經度和緯度，並根據此位置搜索最低距離的經度和緯度。你可以找到現成的，兩個緯度之間的距離計算。基於距離你可以搜索附近醫生 – Lucifer