Android Map Api 使用和开发(2) 定位我的位置、地图弹出泡泡、通过经纬度获取地址

（全部源码地址：http://download.csdn.net/detail/totogo2010/4335701 )

上篇把界面画出来了， 接下来就是显示里面的功能了，那这篇内容就比较丰富了。

主要有这么几道菜：

1、在地图上弹出泡泡显示信息，并且能相应泡泡的点击时间

2、自动定位当前位置（也就是我的位置） --添加了 GPS定位和基站定位。

3、获取经纬度对应的接到地址名称

那下面就开始代码把，理论知识能讲多少是多少。

一 、 地图弹出泡泡的制作

1 、overlay_popup.xml 直接把layout放出来

<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:background="@drawable/bubble_background" android:layout_height="wrap_content"
android:layout_width="wrap_content" android:id="@+id/map_bubblebtn"
android:clickable="true" android:focusable="true" android:paddingTop="5dp"
android:paddingLeft="5dp" android:paddingRight="5dp"
android:paddingBottom="10dp">
<LinearLayout android:orientation="vertical" android:id="@+id/popuptext"
android:layout_width="wrap_content" android:layout_height="wrap_content">
<TextView android:id="@+id/map_bubbleTitle"
android:ellipsize="marquee"
android:textSize="17sp"
android:textColor="#000000"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:singleLine="true"
/>
<TextView  android:id="@+id/map_bubbleText"
android:textSize="14sp"
android:textColor="#000000"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/map_bubbleTitle"
/>
</LinearLayout>

<TextView android:layout_toRightOf="@id/popuptext" android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/expander_ic_minimized"
/>
</RelativeLayout>

还有泡泡的效果图 ，很多同学做项目都是时间很紧张的，别人贴出来代码都觉得不够直观，有截图是王道，

顺应大部分懒人的习惯，我编截图边发：



看到了吧， 泡泡上有title ,有 desc ,还有一个小icon。我把整个layout 设置成：

android:clickable="true" android:focusable="true"

这样这个layout就相当余一个button了，可以点击。

2、那代码怎么实现呢？ FzMapActivity里加入下面代码

private void initPopView(){
if(null == popView){
popView = getLayoutInflater().inflate(R.layout.overlay_popup, null);
mapView.addView(popView, new MapView.LayoutParams(
MapView.LayoutParams.WRAP_CONTENT,
MapView.LayoutParams.WRAP_CONTENT, null,
MapView.LayoutParams.BOTTOM_CENTER));
popView.setVisibility(View.GONE);
}

}

在进入主界面是 初始化一下view。

private View popView;当然这个变量定义也不能少。

3、自定义 itemizedOverlay MyItemizedOverlay

好把，先把代码放出来，光描述怎么写太费劲了。

package com.android.fzmap.map;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.android.fzmap.FzMapActivity;
import com.android.fzmap.R;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.OverlayItem;
import com.google.android.maps.ItemizedOverlay.OnFocusChangeListener;
@SuppressWarnings("rawtypes")
public class MyItemizedOverlay extends ItemizedOverlay implements OnFocusChangeListener,OnClickListener{
private static final String TAG = "MyItemizedOverlay";
private List<OverlayItem> overlays = new ArrayList<OverlayItem>();
private FzMapActivity mContext;
private GeoPoint point = null;
private String desc = "";
private String car_title = "";
private int layout_x = 0; // 用于设置popview 相对某个位置向x轴偏移
private int layout_y = -30; // 用于设置popview 相对某个位置向x轴偏移

private MapView mMapView;
private MapController mMapCtrl;
private View mPopView;

private Drawable itemDrawable;
private Drawable itemSelectDrawable;
private OverlayItem selectItem;
private OverlayItem lastItem;
public void setItemSelectDrawable(Drawable itemSelectDrawable) {
this.itemSelectDrawable = itemSelectDrawable;
}
public MyItemizedOverlay(Drawable defaultMarker) {
super(boundCenterBottom(defaultMarker));
}
public MyItemizedOverlay(Drawable defaultMarker, Context context, MapView mapView, View popView, MapController mapCtrl) {
super(boundCenterBottom(defaultMarker));
itemDrawable = defaultMarker;
itemSelectDrawable = defaultMarker;
mContext = (FzMapActivity) context;
setOnFocusChangeListener(this);
layout_x = itemDrawable.getBounds().centerX();
layout_y = - itemDrawable.getBounds().height();
mMapView =  mapView;
mPopView = popView;
mMapCtrl = mapCtrl;
}
@Override
protected OverlayItem createItem(int i) {
return overlays.get(i);
}
@Override
public int size() {
return overlays.size();
}
public void addOverlay(OverlayItem item) {
overlays.add(item);
populate();
}
public void removeOverlay(int location) {
overlays.remove(location);
}
@Override
public boolean onTap(GeoPoint p, MapView mapView) {
return super.onTap(p, mapView);
}
@Override
protected boolean onTap(int index) {
return super.onTap(index);
}
@Override
public void draw(Canvas canvas, MapView mapView, boolean shadow) {
super.draw(canvas, mapView, shadow);
}
@Override
public void onFocusChanged(ItemizedOverlay overlay, OverlayItem newFocus) {
Log.d(TAG , "item focus changed!");
if (null != newFocus) {
Log.d(TAG , "centerY : " + itemDrawable.getBounds().centerY() + "; centerX :" + itemDrawable.getBounds().centerX());
Log.d(TAG , " height : " + itemDrawable.getBounds().height());
MapView.LayoutParams params = (MapView.LayoutParams) mPopView.getLayoutParams();
params.x = this.layout_x;//Y轴偏移
params.y = this.layout_y;//Y轴偏移
point = newFocus.getPoint();
params.point = point;
mMapCtrl.animateTo(point);
TextView title_TextView = (TextView) mPopView.findViewById(R.id.map_bubbleTitle);
title_TextView.setText(newFocus.getTitle());
TextView desc_TextView = (TextView) mPopView.findViewById(R.id.map_bubbleText);
if(null == newFocus.getSnippet() || "".equals(newFocus.getSnippet())){
desc_TextView.setVisibility(View.GONE);
}else{
this.desc = newFocus.getSnippet();
desc_TextView.setText(this.desc);
desc_TextView.setVisibility(View.VISIBLE);
}
RelativeLayout button = (RelativeLayout) mPopView.findViewById(R.id.map_bubblebtn);
button.setOnClickListener(this);
mMapView.updateViewLayout(mPopView, params);
mPopView.setVisibility(View.VISIBLE);
selectItem = newFocus;
}
}

@Override
public void onClick(View v) {
switch (v.getId()) {
}
}

}

主要是继承 OnFocusChangeListener 监听地图层的变化， 为了方便监听button事件也继承了OnClickListener。

下面这方法监听这个层改变的时间，把泡泡弹出来。

public void onFocusChanged(ItemizedOverlay overlay, OverlayItem newFocus) {

Log.d(TAG , "item focus changed!");

if (null != newFocus) {

Log.d(TAG , "centerY : " + itemDrawable.getBounds().centerY() + "; centerX :" + itemDrawable.getBounds().centerX());

Log.d(TAG , " height : " + itemDrawable.getBounds().height());

MapView.LayoutParams params = (MapView.LayoutParams) mPopView.getLayoutParams();

params.x = this.layout_x;//Y轴偏移

params.y = this.layout_y;//Y轴偏移

point = newFocus.getPoint();

params.point = point;

mMapCtrl.animateTo(point);

TextView title_TextView = (TextView) mPopView.findViewById(R.id.map_bubbleTitle);

title_TextView.setText(newFocus.getTitle());

TextView desc_TextView = (TextView) mPopView.findViewById(R.id.map_bubbleText);

if(null == newFocus.getSnippet() || "".equals(newFocus.getSnippet())){

desc_TextView.setVisibility(View.GONE);

}else{

desc = newFocus.getSnippet();

desc_TextView.setText(desc);

desc_TextView.setVisibility(View.VISIBLE);

}

RelativeLayout button = (RelativeLayout) mPopView.findViewById(R.id.map_bubblebtn);

button.setOnClickListener(this);

mMapView.updateViewLayout(mPopView, params);

mPopView.setVisibility(View.VISIBLE);

selectItem = newFocus;

}

}

二、长按地图获取地图位置并弹出泡泡显示信息

它的继承关系 LongPressOverlay extends Overlay implements OnDoubleTapListener

LongPressOverlay这个层主要是用来接收长按事件 和双击地图界面的

package com.android.fzmap.map;
import android.os.Handler;
import android.view.GestureDetector;
import android.view.GestureDetector.OnDoubleTapListener;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import com.android.fzmap.FzMapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
public class LongPressOverlay extends Overlay implements OnDoubleTapListener,OnGestureListener{
private FzMapActivity mContext;
private MapView mMapView;
private Handler mHandler;
private MapController mMapCtrl;
private GestureDetector gestureScanner = new GestureDetector(this);
private int level = 0;

public LongPressOverlay(FzMapActivity context, MapView mapView, Handler handler,MapController mapCtrl){
mContext = context;
mMapView = mapView;
mHandler = handler;
mMapCtrl = mapCtrl;
}

@Override
public boolean onTouchEvent(MotionEvent event, MapView mapView) {
return gestureScanner.onTouchEvent(event);
}
@Override
public boolean onSingleTapConfirmed(MotionEvent e) {
return false;
}
@Override
public boolean onDoubleTap(MotionEvent e) {
return false;
}
@Override
public boolean onDoubleTapEvent(MotionEvent e) {
if(++level % 3 == 0){
mMapCtrl.zoomIn();
level = 0;
}
return false;
}
@Override
public boolean onDown(MotionEvent e) {
return false;
}
@Override
public void onShowPress(MotionEvent e) {

}
@Override
public boolean onSingleTapUp(MotionEvent e) {
return false;
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
float distanceY) {
return false;
}
@Override
public void onLongPress(MotionEvent e) {
mContext.locPoint = mMapView.getProjection().fromPixels((int) e.getX(),
(int) e.getY());
mHandler.sendEmptyMessage(mContext.MSG_VIEW_LONGPRESS);
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
return false;
}
}

@Override

public void onLongPress(MotionEvent e) {

mContext.locPoint = mMapView.getProjection().fromPixels((int) e.getX(),

(int) e.getY());

mHandler.sendEmptyMessage(mContext.MSG_VIEW_LONGPRESS);

}接收到长按事件后给主界面发消息，由主界面处理。

三、FzLocationManager 这个类用来做gps,基站定位

package com.android.fzmap.map;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
/**
* @author why
*/
public class FzLocationManager {
private final String TAG = "FzLocationManager";
private static Context mContext;
private LocationManager gpsLocationManager;
private LocationManager networkLocationManager;
private static final int MINTIME = 2000;
private static final int MININSTANCE = 2;
private static FzLocationManager instance;
private Location lastLocation = null;
private static LocationCallBack mCallback;

public static void init(Context c , LocationCallBack callback) {
mContext = c;
mCallback = callback;
}

private FzLocationManager() {
// Gps 定位
gpsLocationManager = (LocationManager) mContext
.getSystemService(Context.LOCATION_SERVICE);
Location gpsLocation = gpsLocationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
gpsLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
MINTIME, MININSTANCE, locationListener);
// 基站定位
networkLocationManager = (LocationManager) mContext
.getSystemService(Context.LOCATION_SERVICE);
Location networkLocation = gpsLocationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
networkLocationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, MINTIME, MININSTANCE,
locationListener);
}
public static FzLocationManager getInstance() {
if (null == instance) {
instance = new FzLocationManager();
}
return instance;
}
private void updateLocation(Location location) {
lastLocation = location;
mCallback.onCurrentLocation(location);
}

private final LocationListener locationListener = new LocationListener() {
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onLocationChanged(Location location) {
Log.d(TAG, "onLocationChanged");
updateLocation(location);
}
};
public Location getMyLocation() {
return lastLocation;
}

private static int ENOUGH_LONG = 1000 * 60;

public interface LocationCallBack{
/**
* 当前位置
* @param location
*/
void onCurrentLocation(Location location);
}

public void destoryLocationManager(){
Log.d(TAG, "destoryLocationManager");
gpsLocationManager.removeUpdates(locationListener);
networkLocationManager.removeUpdates(locationListener);
}
}

public interface LocationCallBack{

/**

* 当前位置

* @param location

*/

void onCurrentLocation(Location location);

}

定义一个接口 ，当监听到位置变化时，回调主界面

//locationListener注册监听器到位置服务管理里

networkLocationManager.requestLocationUpdates(

LocationManager.NETWORK_PROVIDER, MINTIME, MININSTANCE,

locationListener);

//位置信息变化回调

private void updateLocation(Location location) {

lastLocation = location;

mCallback.onCurrentLocation(location);

}

四、主界面逻辑

主界面有

package com.android.fzmap;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
import android.graphics.drawable.Drawable;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.ImageButton;
import android.widget.TextView;
import com.android.fzmap.map.FzLocationManager;
import com.android.fzmap.map.FzLocationManager.LocationCallBack;
import com.android.fzmap.map.LongPressOverlay;
import com.android.fzmap.map.MyItemizedOverlay;
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.OverlayItem;
import com.android.fzmap.R;

public class FzMapActivity  extends MapActivity implements LocationCallBack ,OnClickListener{
/** Called when the activity is first created. */
private final String TAG = "FzMapActivity";
private MapView mapView;
private MapController mMapCtrl;
private View popView;
private Drawable myLocationDrawable;
private Drawable mylongPressDrawable;
private FzLocationManager fzLocation;
private MyItemizedOverlay myLocationOverlay;
private MyItemizedOverlay mLongPressOverlay;
private List<Overlay> mapOverlays;
private OverlayItem overlayitem = null;
public GeoPoint locPoint;

ImageButton loction_Btn;
ImageButton layer_Btn;
ImageButton pointwhat_Btn;

public final int MSG_VIEW_LONGPRESS = 10001;
public final int MSG_VIEW_ADDRESSNAME = 10002;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);

loction_Btn = (ImageButton)findViewById(R.id.loction);
layer_Btn = (ImageButton)findViewById(R.id.layer);
pointwhat_Btn = (ImageButton)findViewById(R.id.pointwhat);

loction_Btn.setOnClickListener(this);
layer_Btn.setOnClickListener(this);
pointwhat_Btn.setOnClickListener(this);

myLocationDrawable = getResources().getDrawable(R.drawable.point_where);
mylongPressDrawable = getResources().getDrawable(R.drawable.point_start);

mapView = (MapView) findViewById(R.id.map_view);
mapView.setBuiltInZoomControls(true);
mapView.setClickable(true);
initPopView();
mMapCtrl = mapView.getController();
myLocationOverlay = new MyItemizedOverlay(myLocationDrawable,this, mapView, popView, mMapCtrl);
mLongPressOverlay = new MyItemizedOverlay(mylongPressDrawable,this, mapView, popView, mMapCtrl);
mapOverlays = mapView.getOverlays();
mapOverlays.add(new LongPressOverlay(this, mapView, mHandler, mMapCtrl));
//以北京市中心为中心
GeoPoint cityLocPoint = new GeoPoint(39909230, 116397428);
mMapCtrl.animateTo(cityLocPoint);
mMapCtrl.setZoom(12);
FzLocationManager.init(FzMapActivity.this.getApplicationContext() , FzMapActivity.this);
fzLocation = FzLocationManager.getInstance();

}

private void initPopView(){
if(null == popView){
popView = getLayoutInflater().inflate(R.layout.overlay_popup, null);
mapView.addView(popView, new MapView.LayoutParams(
MapView.LayoutParams.WRAP_CONTENT,
MapView.LayoutParams.WRAP_CONTENT, null,
MapView.LayoutParams.BOTTOM_CENTER));
popView.setVisibility(View.GONE);
}

}

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

@Override
public void onCurrentLocation(Location location) {
Log.d(TAG, "onCurrentLocationy");
GeoPoint point = new GeoPoint(
(int) (location.getLatitude() * 1E6),
(int) (location.getLongitude() * 1E6));
overlayitem = new OverlayItem(point, "我的位置", "");
mMapCtrl.setZoom(16);
if(myLocationOverlay.size() > 0){
myLocationOverlay.removeOverlay(0);
}
myLocationOverlay.addOverlay(overlayitem);
mapOverlays.add(myLocationOverlay);
mMapCtrl.animateTo(point);
}

private String getLocationAddress(GeoPoint point){
String add = "";
Geocoder geoCoder = new Geocoder(getBaseContext(),
Locale.getDefault());
try {
List<Address> addresses = geoCoder.getFromLocation(
point.getLatitudeE6() / 1E6, point.getLongitudeE6() / 1E6, 1);
Address address = addresses.get(0);
int maxLine = address.getMaxAddressLineIndex();
if(maxLine >= 2){
add =  address.getAddressLine(1) + address.getAddressLine(2);
}else {
add = address.getAddressLine(1);
}
} catch (IOException e) {
add = "";
e.printStackTrace();
}
return add;
}

Runnable getAddressName = new Runnable() {
@Override
public void run() {
String addressName = "";
while(true){
addressName = getLocationAddress(locPoint);
Log.d(TAG, "获取地址名称");
if(!"".equals(addressName)){
break;
}
}
Message msg = new Message();
msg.what = MSG_VIEW_ADDRESSNAME;
msg.obj = addressName;
mHandler.sendMessage(msg);
}
};

private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_VIEW_LONGPRESS:
{
if(null == locPoint) return;
new Thread(getAddressName).start();
overlayitem = new OverlayItem(locPoint, "地址名称",
"正在地址加载...");
if(mLongPressOverlay.size() > 0){
mLongPressOverlay.removeOverlay(0);
}
popView.setVisibility(View.GONE);
mLongPressOverlay.addOverlay(overlayitem);
mLongPressOverlay.setFocus(overlayitem);
mapOverlays.add(mLongPressOverlay);
mMapCtrl.animateTo(locPoint);
mapView.invalidate();
}
break;
case MSG_VIEW_ADDRESSNAME:
TextView desc = (TextView) popView.findViewById(R.id.map_bubbleText);
desc.setText((String)msg.obj);
popView.setVisibility(View.VISIBLE);
break;
}
}
};

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.loction:
{

}
break;

default:
break;
}
}

@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
fzLocation.destoryLocationManager();
}
}

部分注释写在代码里了

最后再上一张截图，在室内通过基站定位到我的位置：



五、通过经纬度获取地址

这个单独拷贝出来让大家看看。这个方法获取地址有时候获取不到的，google好像对这个接口有限制。说白了就这这个接口不靠谱。

大家可以尝试用别的方法或手段获取地址

我的代码里加了个死循环去获取位置，这样的方案是不可取的，不过暂时用一下看看效果也好。

/**

* 通过经纬度获取地址

* @param point

* @return

*/

private String getLocationAddress(GeoPoint point){

String add = "";

Geocoder geoCoder = new Geocoder(getBaseContext(),

Locale.getDefault());

try {

List<Address> addresses = geoCoder.getFromLocation(

point.getLatitudeE6() / 1E6, point.getLongitudeE6() / 1E6, 1);

Address address = addresses.get(0);

int maxLine = address.getMaxAddressLineIndex();

if(maxLine >= 2){

add = address.getAddressLine(1) + address.getAddressLine(2);

}else {

add = address.getAddressLine(1);

}

} catch (IOException e) {

add = "";

e.printStackTrace();

}

return add;

}

好了，以上是所有代码， AndroidManifest.xml 在 (一)里有。

最后小结

用google的api获取到的位置放到他的地图上是有偏差的，而且偏差还比不小，大家可以观察一下，这个问题没有很好的免费解决方案。

如果有哪位有什么好建议可以发出来，谢谢。

用基站和gps定位，也没有处理那个是更好的定位的问题。

欢迎大家提建议