我正在开发GpsTracker应用程序目前正在使用gps获取lat，lng值，一旦我关闭gps我无法获得任何lat，lng值但我的要求是基于我需要的可用性的移动数据或wifi或gps得到lat，lng值我很清楚使用位置管理器，但它比googleapi客户端消耗更多电池所以我使用了googleapi客户端 - fusedlocationproviderapi请指导我为什么它在当前api中不能使用此功能。
public class UpdateLocation extends Service implements GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener, LocationListener {
private GoogleApiClient mLocationClient;
private Location mCurrentLocation;
LocationRequest mLocationRequest;
private static final String TAG = "UpdateLocationService";
private static final long INTERVAL = 1000 * 10;
private static final long FASTEST_INTERVAL = 1000 * 5;
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// TODO do something useful
Toast.makeText(this, "onStartCommand", Toast.LENGTH_SHORT).show();
createLocationRequest();
mLocationClient = new GoogleApiClient.Builder(UpdateLocation.this)
.addApi(LocationServices.API).addConnectionCallbacks(UpdateLocation.this)
.addOnConnectionFailedListener(UpdateLocation.this).build();
mLocationClient.connect();
return Service.START_STICKY;
}
protected void createLocationRequest() {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(INTERVAL);
mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
}
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
mCurrentLocation = location;
Toast.makeText(this, mCurrentLocation.getLatitude() +", "+ mCurrentLocation.getLatitude(), Toast.LENGTH_SHORT).show();
}
@Override
public void onConnectionFailed(ConnectionResult arg0) {
// TODO Auto-generated method stub
Toast.makeText(this, "Connection failed", Toast.LENGTH_SHORT).show();
}
@Override
public void onConnected(Bundle arg0) {
// TODO Auto-generated method stub
Toast.makeText(this, "Connected", Toast.LENGTH_SHORT).show();
if (mLocationClient.isConnected()) {
PendingResult<Status> pendingResult = LocationServices.FusedLocationApi.requestLocationUpdates(
mLocationClient, mLocationRequest, this);
}
}
@Override
public void onConnectionSuspended(int arg0) {
// TODO Auto-generated method stub
Toast.makeText(this, "Disconnected. Please re-connect.",
Toast.LENGTH_SHORT).show();
}
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onDestroy() {
if (mLocationClient.isConnected()) {
LocationServices.FusedLocationApi.removeLocationUpdates(
mLocationClient, this);
}
mLocationClient.disconnect();
}
}
答案 0 :(得分：0)
这是我使用的GPSTracker的实现：
public class GPSTracker extends Service implements LocationListener {
private final Context mContext;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
// Declaring a Location Manager
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
getLocation();
}
public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
* */
public void stopUsingGPS(){
if(locationManager != null){
locationManager.removeUpdates(GPSTracker.this);
}
}
/**
* Function to get latitude
* */
public double getLatitude(){
if(location != null){
latitude = location.getLatitude();
}
// return latitude
return latitude;
}
/**
* Function to get longitude
* */
public double getLongitude(){
if(location != null){
longitude = location.getLongitude();
}
// return longitude
return longitude;
}
/**
* Function to check GPS/wifi enabled
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog
* On pressing Settings button will lauch Settings Options
* */
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});
// on pressing cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}
}
添加后，请使用getLocation()方法获取位置。
您还可以添加检查连接建立方式的部分数据或Wifi：
public static boolean isConnected(Context context){
NetworkInfo localNetworkInfo = ((ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE)).getActiveNetworkInfo();
if (localNetworkInfo == null) {
return false;
}
else{
//Check if only wifi is selected or wifi==1 Constant Value: 1 (0x00000001)
if(((localNetworkInfo.getType() == 1)) || (localNetworkInfo.isConnected()) || (localNetworkInfo.isAvailable()))
return true;
}
return false;
}