android - 如何在谷歌地图上搜索存储在我的数据库中的医生地址附近？

Question

我正在开发一个显示的应用程序用户的当前位置也显示医生在谷歌地图上就在他附近。我开发了一个可以找到任何位置的演示应用程序并在上面放一个标记，但我不知道该怎么做通过存储在数据库中的地址查找附近。

 **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);
    }

 }

Answer 1

Location 类为您提供了一个非常好的方法:distanceTo(GeoPoint)。因此，只需使用此方法遍历医生的 GeoPoints。