从J2EE转向Android的第四天-----Android Map

   昨晚受网友之托研究Android Map。

      第一步:申请com.google.android.maps.MapView apiKey

            获取debug keystore的位置:Eclipse——>Windows——>Perferences——>Android——>Build查看Default debug keystor,比如我的C:/Users/Administrator/.android/debug.keystore

           在找到在cmd中运行keytool -list -alias androiddebugkey -keystore "C:/Users/Administrator/.android/debug.keystore" -storepass android -keypass android,路径上一定要加双引号

          执行结果:

               androiddebugkey, 2010-3-16, PrivateKeyEntry,
               认证指纹 (MD5)： XX:XX:XX:E3:XX:D5:XX:43:DF:5D:F0:97:XX:XX:5E:9E  这里就是你的认证指纹

          打开打开http://code.google.com/intl/zh-CN/android/maps-api-signup.html，填写你刚刚生成的认证指纹就能获取apiKey了，这里需要登录Google Account,如果没有先申请一个.

        我获取的结果是：

         <com.google.android.maps.MapView
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
              android:apiKey="XXXXXXXXXXXXXXXXXXXXXX"
          />

        

     第二步：一切准备就绪，只欠东风了.

             新建Android项目,Target 选择Google APIs,或者更改已有项目的Target为Google APIs,打开AndroidManifest.xml文件，

             加入<uses-library android:name="com.google.android.maps" />和<uses-permission android:name="android.permission.INTERNET" />

      我的是：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.lhw.android"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
     <uses-library android:name="com.google.android.maps" />
        <activity android:name=".MainActivity"
                  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" />
</manifest>

 

        将MapView加入界面,如main.xml

         <?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"
    >
     <com.google.android.maps.MapView
            android:id="@+id/mapView"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:enabled="true"
            android:clickable="true"
            android:apiKey="0-P9Tg82hGa-l3pCqAV5jm7EEtIV8s1iOiTD-cQ"
        />
</RelativeLayout >

        

        第三步:编写Activity，将你的Activtity继承自MapActivity,如:

package com.lhw.android;

import android.os.Bundle;

import com.google.android.maps.MapActivity;

public class MainActivity extends MapActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
   
    @Override
    protected boolean isRouteDisplayed() {
        return false;
    }

}

 

    第四步:想要运行这个工程，还需要新建一个Google APIs AVD，这个在Eclipse里新建很简单，也可以用命令建（我当时在这用的以前的Android AVD导致地图显示不出来，呵呵)

      

 

 

 第二个例子：实现Zoom功能

        在main.xml中加入：

       <LinearLayout
              android:id="@+id/zoom"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_alignParentBottom="true"
              android:layout_centerHorizontal="true"
       />

 

     在MainActivity.java代码:

public class MainActivity extends MapActivity {
 private MapView mapView;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        mapView=(MapView)this.findViewById(R.id.mapView);
        LinearLayout zoomLayout=(LinearLayout)this.findViewById(R.id.zoom);
        View zoomView=mapView.getZoomControls();
        zoomLayout.addView(zoomView);
        mapView.displayZoomControls(true);
    }
    @Override
    protected boolean isRouteDisplayed() {
        return false;
    }

}

 

Run，效果如图:

 

      功能扩展:按下键盘↑,↓键实现Zoom功能,在onCreate方法中增加 mapView.setStreetView(true);或mapView.setSatellite(true)自定义显示

   @Override
    public boolean onKeyDown(int keyCode,KeyEvent event){
        MapController mc=mapView.getController();
        switch(keyCode){
            case KeyEvent.KEYCODE_DPAD_UP:
                mc.zoomIn();
                break;
            case KeyEvent.KEYCODE_DPAD_DOWN:
                mc.zoomOut();
                break;
          }
         return super.onKeyDown(keyCode, event);
    }

     

 

第三个例子：在屏幕上打点(因为在现在正在做的GIS项目中叫的“打点”，哈哈）:

      1)自动打点

            package com.lhw.android;

import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.LinearLayout;

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

public class MainActivity extends MapActivity {
 private MapView mapView;
 private MapController mc;
 private GeoPoint p;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        mapView=(MapView)this.findViewById(R.id.mapView);
        mapView.setSatellite(true);
        LinearLayout zoomLayout=(LinearLayout)this.findViewById(R.id.zoom);
        View zoomView=mapView.getZoomControls();
        zoomLayout.addView(zoomView,new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
        mapView.displayZoomControls(true);
        mc=mapView.getController();
        String coordinates[]={"1.352566007", "103.78921587"};
        double latitude=Double.parseDouble(coordinates[0]);
        double longitude=Double.parseDouble(coordinates[1]);
        p=new GeoPoint((int)(latitude*1E6),(int)(longitude*1E6));
        mc.animateTo(p);
        mc.setZoom(17);
        mapView.invalidate();
    }
   
    @Override
    public boolean onKeyDown(int keyCode,KeyEvent event){
     switch(keyCode){
      case KeyEvent.KEYCODE_DPAD_UP:
       mc.zoomIn();
       break;
      case KeyEvent.KEYCODE_DPAD_DOWN:
       mc.zoomOut();
       break;
     }
     return super.onKeyDown(keyCode, event);
    }
   
    @Override
    protected boolean isRouteDisplayed() {
        return false;
    }

}

 

     2)在打点出显示图标

 

 

package com.lhw.android;

import java.util.List;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Point;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.LinearLayout;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;

public class MainActivity extends MapActivity {
 private MapView mapView;
 private MapController mc;
 private GeoPoint p;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        mapView=(MapView)this.findViewById(R.id.mapView);
        mapView.setStreetView(true);
        LinearLayout zoomLayout=(LinearLayout)this.findViewById(R.id.zoom);
        View zoomView=mapView.getZoomControls();
        zoomLayout.addView(zoomView,new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
        mapView.displayZoomControls(true);
        mc=mapView.getController();
        String coordinates[]={"1.352566007", "103.78921587"};
        double latitude=Double.parseDouble(coordinates[0]);
        double longitude=Double.parseDouble(coordinates[1]);
        p=new GeoPoint((int)(latitude*1E6),(int)(longitude*1E6));
        mc.animateTo(p);
        mc.setZoom(17);
       
        //加入新的图层（我这样理解的）
        MapOverlay mapOverlay=new MapOverlay();
        List<Overlay> listOfOverlays=mapView.getOverlays();
        listOfOverlays.clear();
        listOfOverlays.add(mapOverlay);
       
        mapView.invalidate();
    }
   
    @Override
    public boolean onKeyDown(int keyCode,KeyEvent event){
     switch(keyCode){
      case KeyEvent.KEYCODE_DPAD_UP:
       mc.zoomIn();
       break;
      case KeyEvent.KEYCODE_DPAD_DOWN:
       mc.zoomOut();
       break;
     }
     return super.onKeyDown(keyCode, event);
    }
   
    @Override
    protected boolean isRouteDisplayed() {
        return false;
    }
   

    //新加代码，创建新图层类
    class MapOverlay extends Overlay{
     @Override
     public boolean draw(Canvas canvas,MapView mapView,boolean shadow,long when){
      super.draw(canvas, mapView, shadow);
      Point screenPts=new Point();
      mapView.getProjection().toPixels(p, screenPts);
      Bitmap bmp=BitmapFactory.decodeResource(getResources(),R.drawable.mark);
      canvas.drawBitmap(bmp,screenPts.x,screenPts.y-30,null);
      return true;
     }
    }
}

 

 

     3)显示打点坐标

    在MapOverlay类中增加以下方法

      @Override
     public boolean onTouchEvent(MotionEvent event,MapView mapView){
         if(event.getAction()==1){
              GeoPoint p=mapView.getProjection().fromPixels((int)event.getX(),(int)event.getY());
              Toast.makeText(getBaseContext(),p.getLatitudeE6()/1E6+","+p.getLongitudeE6()/1E6,               Toast.LENGTH_SHORT).show();
         }
         return false;
     }

    

     4）显示坐标所在地

     修改MapOver类的onTouchEvent方法:

    @Override
     public boolean onTouchEvent(MotionEvent event,MapView mapView){
          if(event.getAction()==1){
               GeoPoint p=mapView.getProjection().fromPixels((int)event.getX(),(int)event.getY());
               Geocoder geoCoder=new Geocoder(getBaseContext(),Locale.getDefault());
               try{
                    List<Address> addresses=geoCoder.getFromLocation(p.getLatitudeE6()/1E6, p.getLongitudeE6()/1E6,1);
                    String add="";
                   if(addresses.size()>0){
                         for(int i=0;i<addresses.get(0).getMaxAddressLineIndex();i++){
                              add+=addresses.get(0).getAddressLine(i)+"/n";
                        }
                   }
                   Toast.makeText(getBaseContext(), add, Toast.LENGTH_LONG).show();
                   //Toast.makeText(getBaseContext(),p.getLatitudeE6()/1E6+","+p.getLongitudeE6()/1E6, Toast.LENGTH_SHORT).show();
                }catch(Exception e){
                    e.printStackTrace();
              }
               return true;
           }else{
               return false;
          }
     }

   

 

   5)根据地址在地图上定位坐标:

 

    public boolean onTouchEvent(MotionEvent event,MapView mapView){
      if(event.getAction()==1){
       GeoPoint p=mapView.getProjection().fromPixels((int)event.getX(),(int)event.getY());
       Geocoder geoCoder=new Geocoder(getBaseContext(),Locale.getDefault());
              try {
                  List<Address> addresses = geoCoder.getFromLocationName(
                      "empire state building", 5);
                  String add = "";
                  if (addresses.size() > 0) {
                      p = new GeoPoint(
                              (int) (addresses.get(0).getLatitude() * 1E6),
                              (int) (addresses.get(0).getLongitude() * 1E6));
                      mc.animateTo(p);   
                      mapView.invalidate();
                  }   
              } catch (IOException e) {
                  e.printStackTrace();
              }
       return true;
      }else{
       return false;
      }
     }

    

 

 

 

主要参考http://mobiforge.com/developing/story/using-google-maps-android,本来想再研究研究但是头晕了。休息会儿，看日语。明天又继续上班了。唉！