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每一台电脑都要申请属于自己的android:apiKey,要是使用别人的android:apiKey,

则地图只显示方格,不会有实际的地图出现，并且在Android虚拟机重建或者重装电脑的操作系统的时候

也要重新申请android:apiKey，关于如何申请，我在“申请Google Map服务”中已说得很详细。

新建一个地图项目。

在main.xml中：

<?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/mapview"

android:clickable="true" android:enabled="true"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:apiKey="0Pm9QrsSh_mwtc6rMyqZMRu71qFpIB51UXVWHmg" />

</LinearLayout>

在MyOverlayImpl.java中:

package com.li.googlemapproject;

import java.util.ArrayList;

import java.util.List;

import android.app.AlertDialog;

import android.app.Dialog;

import android.content.Context;

import android.content.DialogInterface;

import android.graphics.drawable.Drawable;

import com.google.android.maps.ItemizedOverlay;

import com.google.android.maps.OverlayItem;

public class MyOverlayImpl extends ItemizedOverlay<OverlayItem> {

private List<OverlayItem> allOverlayItems = new ArrayList<OverlayItem>();

private Context context = null;

public MyOverlayImpl(Drawable defaultMarker, Context context) {

super(boundCenter(defaultMarker));

this.context = context;

}

@Override

protected OverlayItem createItem(int i) {

return this.allOverlayItems.get(i);

}

@Override

public int size() {

return this.allOverlayItems.size();

}

@Override

protected boolean onTap(int index) { // 单击标记图片之后的操作

OverlayItem item = this.allOverlayItems.get(index); // 取得指定的点

Dialog dialog = new AlertDialog.Builder(this.context)

.setIcon(R.drawable.pic_m).setTitle(item.getTitle())

.setMessage(item.getSnippet())

.setPositiveButton("关闭", new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog,int which) {

}

}).create();

dialog.show();

return true;

}

public void addOverlayItem(OverlayItem item) {

this.allOverlayItems.add(item);

super.populate();

}

在PaintLineOverlay.java中:

package com.li.googlemapproject;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Paint.Style;

import android.graphics.Point;

import com.google.android.maps.GeoPoint;

import com.google.android.maps.MapView;

import com.google.android.maps.Overlay;

import com.google.android.maps.Projection;

public class PaintLineOverlay extends Overlay {

private GeoPoint beginGeoPoint = null;

private GeoPoint endGeoPoint = null;

public PaintLineOverlay(GeoPoint beginGeoPoint, GeoPoint endGeoPoint) {

this.beginGeoPoint = beginGeoPoint;

this.endGeoPoint = endGeoPoint;

}

@Override

public void draw(Canvas canvas, MapView mapView, boolean shadow) {

Paint paint = new Paint();

paint.setStyle(Style.FILL_AND_STROKE);

paint.setStrokeWidth(3);

paint.setColor(Color.RED);

Point beginPoint = new Point();

Point endPoint = new Point();

Projection projection = mapView.getProjection();

projection.toPixels(this.beginGeoPoint, beginPoint);

projection.toPixels(this.endGeoPoint, endPoint);

canvas.drawLine(beginPoint.x, beginPoint.y, endPoint.x, endPoint.y,

paint);

}

在PaintPointOverlay.java中:

package com.li.googlemapproject;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Point;

import com.google.android.maps.GeoPoint;

import com.google.android.maps.MapView;

import com.google.android.maps.Overlay;

import com.google.android.maps.Projection;

public class PaintPointOverlay extends Overlay {

private GeoPoint geoPoint = null;

public PaintPointOverlay(GeoPoint geoPoint) {

this.geoPoint = geoPoint;

}

@Override

public void draw(Canvas canvas, MapView mapView, boolean shadow) {

Point point = new Point();

Projection projection = mapView.getProjection();

projection.toPixels(this.geoPoint, point); // 将地图上坐标的点设置为绘图屏幕的点

Paint paint = new Paint();

paint.setColor(Color.RED);

canvas.drawCircle(point.x, point.y, 6, paint);

}

在MyGoogleMapDemo.java中:

package com.li.googlemapproject;

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;

public class MyGoogleMapDemo extends MapActivity {

private MapView mapView = null;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

super.setContentView(R.layout.main);

this.mapView = (MapView) super.findViewById(R.id.mapview); // 取得地图视图

this.mapView.setBuiltInZoomControls(true);

// 给定一个坐标：天安门的坐标：116.3975060，39.9087110

GeoPoint beginGeoPoint = new GeoPoint((int) (39.9087110 * 1E6),

(int) (116.3975060 * 1E6));

GeoPoint endGeoPoint = new GeoPoint((int) (39.9995740 * 1E6),

(int) (116.2739010 * 1E6));

this.mapView.getOverlays().add(new PaintPointOverlay(beginGeoPoint));

this.mapView.getOverlays().add(new PaintPointOverlay(endGeoPoint));

this.mapView.getOverlays().add(

new PaintLineOverlay(beginGeoPoint, endGeoPoint));

MapController mapController = this.mapView.getController() ;

mapController.animateTo(beginGeoPoint); // 设置坐标的动画

mapController.setZoom(12); // 最大的级别是12

}

@Override

protected boolean isRouteDisplayed() {

return false;

}

在AndroidManifest.xml中修改权限:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.li.googlemapproject"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk

android:minSdkVersion="8"

android:targetSdkVersion="15" />

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

<application

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme" >

<activity

android:name=".MyGoogleMapDemo"

android:label="@string/title_activity_my_google_map_demo" >

<intent-filter>

</intent-filter>

</activity>

<uses-library android:name="com.google.android.maps" />

</application>

<uses-permission android:name="android.permission.INTERNET"/>

</manifest>

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