我想知道如何获得我的位置（经度和纬度， 我在某个时间以最准确的方式在地图上不需要位置。例如，当两个设备之间发生断开时。
我见过很多Google API的例子，但他们更专注于跟踪而不是在某个时间获取坐标。
我在一些网站上读过getLastKnownLocation并不准确。
提前致谢。
答案 0 :(得分：0)
我为获取当前位置lat和long值创建单独的类。 在课堂下面用于定位。
public class GPSController implements
LocationListener,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener
{ OnLocationUpdateListener onLocationUpdateListener; public final String TAG = getClass（）。getSimpleName（）;
private FusedLocationProviderApi fusedLocationProviderApi = LocationServices.FusedLocationApi;
GoogleApiClient googleApiClient;
LocationRequest mLocationRequest;
Location mCurrentLocation;
private static long INTERVAL = 1000 * 10;
private static long FASTEST_INTERVAL = 1000 * 5;
FragmentActivity mActivity;
private boolean isLiveUpdate = false;
PendingResult<LocationSettingsResult> result;
/**
* Checking permission and connect with Google Location service
* @param activity
*/
public GPSController(FragmentActivity activity) {
this.mActivity = activity;
if(PermissionManager.checkPermission(mActivity,PermissionManager.ACCESS_LOCATION))
{
if (!isGooglePlayServicesAvailable()) {
CustomLogHandler.printInfolog("checking googleplayservice : ", "false");
((BaseActivity)mActivity).showAlertDialog(mActivity, mActivity.getString(R.string.app_name), mActivity.getString(R.string.play_service_not_found));
} else {
CustomLogHandler.printInfolog("checking googleplayservice : ", "true");
createLocationRequest();
initFuseAPI();
}
}
else
{
PermissionManager.askForPermission(PermissionManager.ACCESS_LOCATION,mActivity);
}
}
public void connectForLocation()
{
createLocationRequest();
initFuseAPI();
}
/**
* Turn on Live update of location on given interval
* @param value
* @param INTERVAL
* @param FASTEST_INTERVAL
*/
public void turnOnLiveUpdate(boolean value,long INTERVAL,long FASTEST_INTERVAL)
{
isLiveUpdate = value;
this.INTERVAL = INTERVAL;
this.FASTEST_INTERVAL = FASTEST_INTERVAL;
}
/**
* Turn off live update of location
*/
public void turnOffLiveUpdate()
{
isLiveUpdate = false;
}
/**
* Disconnect from Google location service
*/
public void disconnect()
{
try {
Log.d(TAG, "onStop fired ..............");
googleApiClient.disconnect();
Log.d(TAG, "isConnected ...............: " +googleApiClient.isConnected());
}catch (Throwable throwable)
{
throwable.printStackTrace();
}
}
/**
* Resume Location update service if stopped
*/
public void onResumeUpdate()
{
try {
if(googleApiClient != null) {
if (googleApiClient.isConnected()) {
startLocationUpdates();
Log.d(TAG, "Location update resumed .....................");
}
}
}catch (Throwable throwable)
{
throwable.printStackTrace();
}
}
public void setLocatonUpdateListener(OnLocationUpdateListener onLocationUpdateListener)
{
this.onLocationUpdateListener = onLocationUpdateListener;
}
/**
* Create location update request
*/
protected void createLocationRequest() {
try {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(INTERVAL);
mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}catch (Throwable throwable)
{
throwable.printStackTrace();
}
}
/**
* Initialize google location service
*/
void initFuseAPI()
{
try
{
googleApiClient = new GoogleApiClient.Builder(mActivity)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
Log.d(TAG, "initFuseAPI fired ..............");
googleApiClient.connect();
}catch (Throwable throwable)
{
throwable.printStackTrace();
}
}
/**
* Check Google location service is available or not
* @return
*/
private boolean isGooglePlayServicesAvailable() {
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(mActivity);
if (ConnectionResult.SUCCESS == status) {
return true;
} else {
GooglePlayServicesUtil.getErrorDialog(status, mActivity, 0).show();
return false;
}
}
/**
* called when connected with google location service
* @param bundle
*/
@Override
public void onConnected( Bundle bundle) {
Log.d(TAG, "onConnected - isConnected ...............: " + googleApiClient.isConnected());
LocationManager manager = (LocationManager) mActivity.getSystemService(Context.LOCATION_SERVICE );
boolean statusOfGPS = manager.isProviderEnabled(LocationManager.GPS_PROVIDER);
if(statusOfGPS) {
startLocationUpdates();
}else
{
enableGpsService();
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed( ConnectionResult connectionResult) {
}
/**
* Location update received here
* @param location
*/
@Override
public void onLocationChanged(Location location) {
Log.d(TAG, "Firing onLocationChanged..............................................");
mCurrentLocation = location;
SetLocation();
}
void enableGpsService()
{
try
{
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
.addLocationRequest(mLocationRequest);
builder.setAlwaysShow(true);
result = LocationServices.SettingsApi.checkLocationSettings(googleApiClient, builder.build());
result.setResultCallback(new ResultCallback<LocationSettingsResult>() {
@Override
public void onResult( LocationSettingsResult locationSettingsResult) {
final Status status = locationSettingsResult.getStatus();
switch (status.getStatusCode()) {
case LocationSettingsStatusCodes.SUCCESS:
//already connected to GPS
startLocationUpdates();
break;
case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
// Location settings are not satisfied. But could be fixed by
// showing the user a dialog.
try {
status.startResolutionForResult(mActivity, PermissionManager.REQUEST_LOCATION);
startLocationUpdates();
} catch (IntentSender.SendIntentException e) {
// Ignore the error.
}
break;
case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
//redirect user to setting screen, manually user can enble GPS
mActivity.startActivity(new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS));
break;
}
}
});
}catch (Throwable throwable)
{
throwable.printStackTrace();
}
}
/**
* Request location update service
*/
public void startLocationUpdates()
{
try {
//check required even you checked it previously
if (PermissionManager.checkPermission(mActivity, PermissionManager.ACCESS_LOCATION))
{
fusedLocationProviderApi.requestLocationUpdates(googleApiClient, mLocationRequest, this);
Log.d(TAG, "Location update started ..............: ");
} else {
PermissionManager.askForPermission(PermissionManager.ACCESS_LOCATION, mActivity);
}
}catch (Throwable throwable)
{
throwable.printStackTrace();
}
}
/**
* Stop location update
*/
public void stopLocationUpdates() {
try {
if(googleApiClient != null) {
fusedLocationProviderApi.removeLocationUpdates(
googleApiClient, this);
Log.d(TAG, "Location update stopped .......................");
}
}catch (Throwable throwable)
{
throwable.printStackTrace();
}
}
/**
* set location values received
*/
private void SetLocation()
{
try {
Log.d(TAG, "UI update initiated .............");
if (null != mCurrentLocation) {
onLocationUpdateListener.onLocationUpdate(mCurrentLocation);
/**isLiveUpdate = true for Live update **/
if (!isLiveUpdate) {
fusedLocationProviderApi.removeLocationUpdates(googleApiClient,this);
}
googleApiClient.disconnect();
//mCurrentLocation.getAccuracy()
//mCurrentLocation.getProvider()
} else {
Log.d(TAG, "location is null ...............");
}
}catch (Throwable throwable)
{
throwable.printStackTrace();
}
}
public Location getLocation(){
return mCurrentLocation;
}
public static List<Address> getAddress(Double mLat, Double mLang, Context context)
{
List<Address> addresses = null;
try
{
Geocoder geocoder = new Geocoder(context, Locale.getDefault());
addresses = geocoder.getFromLocation(mLat, mLang, 1);
}catch (Exception e)
{
e.printStackTrace();
}
return addresses;
}
/**
* For receive location update
*/
public interface OnLocationUpdateListener {
void onLocationUpdate(Location mCurrentLocation);
}
}
然后用于下面的活动类......
private GPSController gpsController;
@Override
public void onStop() {
super.onStop();
if (gpsController != null)
gpsController.disconnect();
}
@Override
public void onPause() {
super.onPause();
if (gpsController != null)
gpsController.stopLocationUpdates();
}
@Override
public void onResume() {
super.onResume();
gpsController = new GPSController(getActivity());
gpsController.setLocatonUpdateListener(this);
if (gpsController != null)
gpsController.onResumeUpdate();
}
@Override
public void onLocationUpdate(Location mCurrentLocation) {
CURRENT_LET = String.valueOf(mCurrentLocation.getLatitude());
CURRENT_LANG = String.valueOf(mCurrentLocation.getLongitude());
loadMoreItems();
}
也是pl note活动类在接口下面实现这个..
implements GPSController.OnLocationUpdateListener
如果您不需要，可以删除权限代码。
add还在清单文件中添加两个权限..
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>