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);
        }
    }
    
}