GoogleMap学习——Android学习笔记

在Androidmanifest中申明

1.<uses-library android:name="com.google.android.maps"/>
2.<uses-permission android:name="android.permission.INTERNET"/>
3. <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
4.<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.androidgooglemaptext"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="10"
        android:targetSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <uses-library android:name="com.google.android.maps"/>
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <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.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />27 　　<uses-permission android:name="android.permission.INTERNET"/>
</manifest>

xml中一般写法

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

   <com.google.android.maps.MapView android:layout_height="fill_parent"
       android:layout_width="fill_parent"
       android:apiKey="0rkDwKdJeAcrKXismOod8zeo2oqJVB5Kq6GrujQ"
       android:enabled="true"
       android:id="@+id/mapViewId"
       android:clickable="true"
       />
</RelativeLayout>

Activity:

package com.example.androidgooglemaptext;

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 android.view.Menu;

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;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_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);
    }

    class LineOverlay extends Overlay {
        private GeoPoint begin;
        private GeoPoint end;

        public LineOverlay() {
        }

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

        @Override
        public void draw(Canvas arg0, MapView arg1, boolean arg2) {
            super.draw(arg0, arg1, arg2);
            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(beginGeoPoint, beginPoint);
            projection.toPixels(endGeoPoint, endPoint);
            // 指定划线的起始
            path.moveTo(beginPoint.x, beginPoint.y);
            // 指定划线的终点
            path.lineTo(endPoint.x, endPoint.y);
            arg0.drawPath(path, paint);
        }

    }

    class PointOverlay extends Overlay {
        private GeoPoint geoPoint;

        public PointOverlay() {
            // TODO Auto-generated constructor stub
        }

        public PointOverlay(GeoPoint geoPoint) {
            this.geoPoint = geoPoint;
        }

        @Override
        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();
            // 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 - 16, paint);
        }

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    @Override
    protected boolean isRouteDisplayed() {
        return false;
    }
}

结果