android取得所在位置的经纬度

android提供了LocationManager来取得位置,用LocationListener来监听位置的变化

先做一些初始化工作:

/** latitude and longitude of current location*/
public static String mLat = "";
public static String mLon = "";

/** time out for GPS location update */
private  Timer mGpsTimer = new Timer();
/** TimerTask for time out of GPS location update */
private  GpsTimeOutTask mGpsTimeOutTask = new GpsTimeOutTask();
/** GPS location update time out in milliseconds*/
private  long mGpsTimeOut = 180000;//3 minutes
<span style="white-space:pre">	</span>public void initiLocationUtil (Context context, LocationObsever locationobsever){
mLocationObsever = locationobsever;
mContext = context;
mLocationManager = (LocationManager)mContext.getSystemService(Context.LOCATION_SERVICE);
mLocationListener = new MyLocationListener();
}

<span style="white-space:pre">		</span>public void RefreshGPS(boolean calledByCreate){

mLocationManager.removeUpdates(mLocationListener);
boolean providerEnable = true;
boolean showLocationServiceDisableNotice = true;
//看是否有GPS权限
if(mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)){
//開始进行定位 mLocationListener为位置监听器
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
0,
0,
mLocationListener);
showLocationServiceDisableNotice = false;

//start time out timer
mGpsTimer = new Timer();
mGpsTimeOutTask = new GpsTimeOutTask();
mGpsTimer.schedule(mGpsTimeOutTask, mGpsTimeOut);

}

if(mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)){
mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
0,
0,
mLocationListener);
showLocationServiceDisableNotice = false;
providerEnable = true;
}

if(providerEnable){
if(mLocationObsever != null){
mLocationObsever.notifyChange(REFRESHGPS_COMPLETED, null);
}

}else{
if(mLocationObsever != null){
mLocationObsever.notifyChange(REFRESHGPS_NOPROVIDER, null);
}

}

if(showLocationServiceDisableNotice){
showLocationServiceDisabledDialog();
}

}

监听器:

private  class MyLocationListener implements LocationListener{
private boolean mLocationReceived = false;
@Override
public void onLocationChanged(Location location) {
if(location != null && !mLocationReceived){
mLocationReceived = true;
String lon = String.valueOf(location.getLongitude());
String lat = String.valueOf(location.getLatitude());
if(mLocationObsever != null){
mLocationObsever.notifyChange(DEFAULT_LOCATION_COMPLETED, lat+","+lon);
}
}else  if(location == null){
if(mLocationObsever != null){
mLocationObsever.notifyChange(GETLOCATION_FAILED, null);
}
}
}

@Override
public void onProviderDisabled(String provider) {

}

@Override
public void onProviderEnabled(String provider) {

}

@Override
public void onStatusChanged(String provider, int status,
Bundle extras) {
// TODO Auto-generated method stub
//if GPS provider is not accessible, try network provider
if(provider.equals(LocationManager.GPS_PROVIDER) && status != LocationProvider.AVAILABLE){
if(mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)){
mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
0,
0,
mLocationListener);
}else{
mLocationManager.removeUpdates(mLocationListener);

if(mLocationObsever != null){
mLocationObsever.notifyChange(STATUS_CHANGED, null);
}
}
}
}
}

这里用了一个Timer，3分钟后又一次去取一次位置:

private Handler mGpsTimerHandler = new Handler() {
public void handleMessage(Message msg) {

if (mLocationManager == null) {
return;
}
if (mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
System.out.println("=====use network to get location");
mLocationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, 0, 0,
mLocationListener);
} else {
mLocationManager.removeUpdates(mLocationListener);

// mLocationObsever.notifyChange(SETADDLOCATIONBUTTONSTATE_1_SETLOCATIONDES_1,null);
if (mLocationObsever != null) {
mLocationObsever.notifyChange(GPSTIMEOUT, null);
}
}
}
};

界面退出的时候要关掉GPS

/**
* cancel operations of refreshing GPS
*/
public  void cancelRefreshGPS(){
if(mLocationManager != null){
mLocationManager.removeUpdates(mLocationListener);
}

if(mLocationObsever != null){
mLocationObsever.notifyChange(CANCELGPS_COMPLETED, null);
}
}

public  void destroy (){
if(mLocationManager != null){
mLocationManager.removeUpdates(mLocationListener);
}

if(mGpsTimer != null){
mGpsTimer.cancel();
}

cancelRefreshGPS();

mContext = null;
mLocationObsever = null;

mLocationBuildingList = null;

System.gc();
}

截图是



点击MAP的时候,假设採用google map,必须使用sdk带有google api,然后在application中增加<uses-library android:name="com.google.android.maps" />

然后xml是:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#FFFFFF"
android:gravity="center_horizontal"
android:orientation="vertical" >

<include layout="@layout/title_list" />

<View
android:id="@+id/line"
android:layout_width="fill_parent"
android:layout_height="2dip"
android:layout_below="@id/title"
android:background="@drawable/rc_list_divider" />

<com.google.android.maps.MapView
android:id="@+id/mapview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:apiKey="06nx-Rzpy8WU16_gjO8ZbtRYYY-junnxNArrxFg" />

</LinearLayout>

代码是:

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.around_map);
mTextView = (TextView)findViewById(R.id.title_text);
mTextView.setText("地图");

Intent intent = getIntent();
mLatitude = intent.getDoubleExtra("lat", 0.0);
mLongitude = intent.getDoubleExtra("lon", 0.0);

mMapView = (MapView) findViewById(R.id.mapview);
mMapView.setClickable(true);
mMapView.setBuiltInZoomControls(true);
mMapView.setSatellite(true);
mapController = mMapView.getController();
//	    geoPoint = new GeoPoint((int)(mLatitude * 1E6), (int)(mLongitude * 1E6));
geoPoint=new GeoPoint((int)(30.659259*1000000),(int)(104.065762*1000000));
mMapView.displayZoomControls(true);

//	    //  设置地图的初始大小。范围在1和21之间。1：最小尺寸，21：最大尺寸
mapController.setZoom(16);
//
//	//  创建MyOverlay对象，用于在地图上绘制图形
MyOverlay myOverlay = new MyOverlay();
mMapView.getOverlays().add(myOverlay);
mapController.animateTo(geoPoint);
}

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

class MyOverlay extends Overlay
{
@Override
public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when)
{
Paint paint = new Paint();

//屏幕上文字字体颜色
paint.setColor(Color.RED);
Point screenPoint = new Point();

mapView.getProjection().toPixels(geoPoint, screenPoint);
Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.location);
//  在地图上绘制图像
canvas.drawBitmap(bmp, screenPoint.x, screenPoint.y, paint);
//  在地图上绘制文字
//	        canvas.drawText("移动巴士", 10, 100, paint);
return super.draw(canvas, mapView, shadow, when);
}
}

代码能够在http://download.csdn.net/detail/baidu_nod/7622677下载