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：

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:

从J2EE转向Android的第四天-----Android Map_第1张图片

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;
}
}

从J2EE转向Android的第四天-----Android Map_第2张图片

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！

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