getLastLocation()在我的6.0 Nexus 7平板电脑上手机位置关闭时，如果返回NULL，则返回NULL，但在另一台设备上没有GPS的情况下也可以使用。为什么会这样，并且有什么解决办法？我想保持GPS关闭，仅使用网络获取位置。
以下是我用来获取位置的课程：
public class GPSCenter {
public static GoogleApiClient mGoogleApiClient;
public static Location mLastLocation;
private static Context mContext;
static GoogleApiClient.ConnectionCallbacks ccb = new GoogleApiClient.ConnectionCallbacks() {
@Override
public void onConnectionSuspended(int arg0) {
}
@Override
public void onConnected(Bundle arg0) {
if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
LocationRequest mLocationRequest = LocationRequest.create();
mLocationRequest.setPriority(LocationRequest.PRIORITY_NO_POWER);
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
}
};
static GoogleApiClient.OnConnectionFailedListener odfl = new GoogleApiClient.OnConnectionFailedListener() {
@Override
public void onConnectionFailed(ConnectionResult arg0) {
}
};
public static synchronized void buildGoogleApiClient(Context c) {
try {
mContext = c;
mGoogleApiClient = new GoogleApiClient.Builder(c)
.addConnectionCallbacks(ccb)
.addOnConnectionFailedListener(odfl)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
} catch (Exception ex) {
Log.i("location", "error " + ex.toString());
ex.printStackTrace();
}
}
public static double getLatitude(Context c) {
try {
return mLastLocation.getLatitude();
} catch (Exception ex) {
return 0.0;
}
}
public static double getLongitude(Context c) {
try {
return mLastLocation.getLongitude();
} catch (Exception ex) {
return 0.0;
}
}
}
这不是由于GPS引起的，而是Location Settings尚未在设备中启用，而是在设备的“设置”>“ Google”>“服务”>“位置”或“设置”>“隐私和安全性”>“位置”下，或者仅在“设置”>“位置”下。我很困惑，因为在某些设备中，下拉状态栏显示GPS启用按钮，而某些显示位置启用按钮。有一种方法可以自动启用“位置设置”（无需将用户导航到设备设置），它解决了我的问题，希望对您有所帮助：
连接GoogleApiClient后，请执行以下位置设置检查：
public static GoogleApiClient mGoogleApiClient;
private static PendingResult<LocationSettingsResult> result;
private static LocationSettingsRequest.Builder builder;
public static Location mLastLocation;
public static boolean isLocationON = false;
public static synchronized void buildGoogleApiClient(Activity a, Context c) {
try {
mActivity = a;
mContext = c;
mGoogleApiClient = new GoogleApiClient.Builder(c)
.addConnectionCallbacks(ccb)
.addOnConnectionFailedListener(odfl)
.addApi(LocationServices.API)
.build();
builder = new LocationSettingsRequest.Builder()
.addLocationRequest(locationRequest);
builder.setAlwaysShow(true);
mGoogleApiClient.connect();
} catch (Exception ex) {
ex.printStackTrace();
}
}
private static GoogleApiClient.ConnectionCallbacks ccb = new GoogleApiClient.ConnectionCallbacks() {
@Override
public void onConnected(Bundle arg0) {
checkLocationSettings();
}
@Override
public void onConnectionSuspended(int arg0) {
}
};
private static void checkLocationSettings() {
result = LocationServices.SettingsApi.checkLocationSettings(mGoogleApiClient, builder.build());
result.setResultCallback(new ResultCallback<LocationSettingsResult>() {
@Override
public void onResult(@NonNull LocationSettingsResult locationSettingsResult) {
final Status status = locationSettingsResult.getStatus();
switch (status.getStatusCode()) {
case LocationSettingsStatusCodes.SUCCESS:
isLocationON = true;
if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (mLocationSettingsListener != null) {
mLocationSettingsListener.onLocationON();
}
break;
case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
isLocationON = false;
try {
// This line will check the result and prompt a dialog if the device location settings is not enabled
status.startResolutionForResult(mActivity, REQUEST_CHECK_SETTINGS);
} catch (IntentSender.SendIntentException e) {
}
break;
case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
isLocationON = false;
// Location settings are unavailable so not possible to show any dialog now
if (mLocationSettingsListener != null) {
mLocationSettingsListener.onLocationError();
}
break;
}
}
});
}
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