ANDROID_MARS学习笔记_S03_009_GOOGLEMAP3

一、代码

1.xml
(1)main.xml

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:orientation="vertical"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     >
 <com.google.android.maps.MapView
         android:id="@+id/mapViewId"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent"
         android:enabled="true"
         android:clickable="true"
         android:apiKey="0pkT0EYxPi2VZ5beDaJ0g08aCtWGmKTFnOvj6iw"
         />
 </LinearLayout>

(2)AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
       package="com.se7en"
       android:versionCode="1"
       android:versionName="1.0">
     <uses-sdk android:minSdkVersion="8" />

     <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>

2.java
(1)MainActivity.java

 package com.se7en;

 import java.util.List;

 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Paint;
 import android.graphics.Path;
 import android.graphics.Point;
 import android.os.Bundle;

 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;
 import com.google.android.maps.Projection;

 public class MainActivity extends MapActivity {
     private Projection projection;
     private List<Overlay> overlays;
     private MapController mapController;
     private GeoPoint beginGeoPoint;
     private GeoPoint endGeoPoint;

     /** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);

         beginGeoPoint = new GeoPoint(19240000,-99120000);
         endGeoPoint = new GeoPoint(19340000,-99220000);

         MapView mapView = (MapView)findViewById(R.id.mapViewId);
         mapView.setBuiltInZoomControls(true);

         //mapController主要用于对地图进行控制
         mapController = mapView.getController();
         overlays = mapView.getOverlays();
         projection = mapView.getProjection();

         overlays.add(new PointOverlay(beginGeoPoint));
         overlays.add(new PointOverlay(endGeoPoint));
         overlays.add(new LineOverlay(beginGeoPoint,endGeoPoint));

         //将地图以动画的形式移动到指定的点
         mapController.animateTo(beginGeoPoint);
         //设置地图的放大级别
         mapController.setZoom(12);
     }

     @Override
     protected boolean isRouteDisplayed() {
         // TODO Auto-generated method stub
         return false;
     }

     //图标层
     class PointOverlay extends Overlay{
         private GeoPoint geoPoint;
         public PointOverlay(){

         }
         public PointOverlay(GeoPoint geoPoint){
             this.geoPoint = geoPoint;
         }
         public void draw(Canvas canvas,MapView mapView,boolean shadow){
             super.draw(canvas, mapView, shadow);
             Point point = new Point();
             //将geoPoint转换为屏幕上的X、Y轴坐标
             projection.toPixels(geoPoint, point);
             //位图
             Bitmap bmp = BitmapFactory.decodeResource(getResources(),R.drawable.tool);
             Paint paint = new Paint();//画笔
             //Y轴-30是为了调整图片的显示位置(默认是讲图片的左上角对应到经纬度点)
             canvas.drawBitmap(bmp,point.x,point.y-30,paint);
         }
     }

     //路线层
     class LineOverlay extends Overlay{
         private GeoPoint begin;
         private GeoPoint end;

         public LineOverlay(){}
         public LineOverlay(GeoPoint begin,GeoPoint end){
             this.begin = begin;
             this.end = end;
         }

         public void draw(Canvas canvas,MapView mapView,boolean shadow){
             super.draw(canvas, mapView, shadow);
             Paint paint = new Paint();
             paint.setColor(Color.BLUE);
             //设置线条的样式（填满的空心线）
             paint.setStyle(Paint.Style.FILL_AND_STROKE);
             paint.setStrokeWidth(2);
             Point beginPoint = new Point();
             Point endPoint = new Point();
             Path path = new Path();
             projection.toPixels(begin,beginPoint);
             projection.toPixels(end,endPoint);
             //指定划线的起始点
             path.moveTo(beginPoint.x,beginPoint.y);
             //指定划线的终点
             path.lineTo(endPoint.x,endPoint.y);
             canvas.drawPath(path,paint);
         }
     }

 }