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我有一個程序，獲取用戶的經度和緯度。當我打開GPS或網絡提供商新的，我的程序不會得到經度和緯度
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Create a criteria object to retrieve provider
Criteria criteria = new Criteria();
// Get the name of the best provider
String provider = locationManager.getBestProvider(criteria, true);
// Get Current Location
if (ActivityCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
}
Location myLocation = locationManager.getLastKnownLocation(provider);
Location myLocation = locationManager.getLastKnownLocation(provider);
boolean netEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
boolean isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (netEnabled) {
if (isGPSEnabled) {
latitude = myLocation.getLatitude();
longitude = myLocation.getLongitude()
} else if (!isGPSEnabled) {
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
} else {
// displayPromptForEnablingGPS(MapsActivity.this);
}
}
} else if (!netEnabled) {
if (isGPSEnabled) {
latitude = myLocation.getLatitude();
// Get longitude of the current location
longitude = myLocation.getLongitude();
} else {
// displayPromptForEnablingGPS(MapsActivity.this);
}
}
（displayPromptForEnablingGPS爲ACTION_LOCATION_SOURCE_SETTINGS）
在程序中，如果GPS和網絡提供商都關閉，將打開一個窗口，用於對它們進行切換。當我第一次開啓GPS時，如果（GPSEnabled）方法（緯度= myLocation.getLatitude（）上的錯誤）首先給出錯誤。我無法獲得經度和緯度。當我只接入網絡提供商時也是如此。它給「位置」變量null。但是，如果我打開Google地圖，它會開始獲取經度和緯度。
問題是什麼？這是手機的問題，或者我必須通過編寫任何代碼使GPS運行？
感謝您的幫助。