public void onMapReady(GoogleMap googleMap) {
Toast.makeText(this, "Map is Ready", Toast.LENGTH_SHORT).show();
Log.d(TAG, "onMapReady: map is ready");
mMap = googleMap;
if (mLocationPermissionsGranted) {
getDeviceLocation();
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
mMap.setBuildingsEnabled(true);
mMap.getUiSettings().setMyLocationButtonEnabled(false);
}
}
private void getDeviceLocation() {
Log.d(TAG, "getDeviceLocation: Getting the current location");
mFusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);
try {
if (mLocationPermissionsGranted) {
final com.google.android.gms.tasks.Task<Location> location = mFusedLocationProviderClient.getLastLocation();
location.addOnCompleteListener(new OnCompleteListener<Location>() {
@Override
public void onComplete(@NonNull com.google.android.gms.tasks.Task<Location> task) {
if(task.isSuccessful()){
Log.d(TAG, "onComplete: found Location");
Location currentLocation = (Location) task.getResult();
moveCamera(new LatLng(currentLocation.getLatitude() ,currentLocation.getLongitude()),DEFAULT_ZOOM);
}else{
Log.d(TAG, "onComplete: current location is null");
Toast.makeText(MapActivity.this,"Unable to get current location", Toast.LENGTH_SHORT).show();
}
}
});
}
} catch (SecurityException e) {
Log.e(TAG, "getDeviceLocation: SecurityException " + e.getMessage());
}
}
错误： E / AndroidRuntime：致命异常：main 流程：com.uws.pnai.mapsapi，PID：15830 java.lang.NullPointerException：尝试在空对象引用上调用虚拟方法'double android.location.Location.getLatitude（）' 在com.uws.pnai.mapsapi.MapActivity $ 1.onComplete（MapActivity.java:77） com.google.android.gms.tasks.zzf.run（未知来源） 在android.os.Handler.handleCallback（Handler.java:751） 在android.os.Handler.dispatchMessage（Handler.java:95） 在android.os.Looper.loop（Looper.java:154） 在android.app.ActivityThread.main（ActivityThread.java:6780） 在java.lang.reflect.Method.invoke（本机方法） 在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:1500） 在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1390）
答案 0 :(得分：0)
首先将此实现添加到您的build.gradle文件中
compile 'com.google.android.gms:play-services-location:11.2.0'
在实现之后，在您的活动或片段中实现（实现LocationListener），然后在实现其功能之后，然后
在您的onCreate() getLocation();中调用此方法
然后在此函数中添加这些行
protected void getLocation() {
if (isLocationEnabled(MainActivity.this)) {
locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
criteria = new Criteria();
bestProvider = String.valueOf(locationManager.getBestProvider(criteria, true)).toString();
//You can still do this if you like, you might get lucky:
Location location = locationManager.getLastKnownLocation(bestProvider);
if (location != null) {
Log.e("TAG", "GPS is on");
latitude = location.getLatitude();
longitude = location.getLongitude();
Toast.makeText(MainActivity.this, "latitude:" + latitude + " longitude:" + longitude, Toast.LENGTH_SHORT).show();
searchNearestPlace(voice2text);
}
else{
//This is what you need:
locationManager.requestLocationUpdates(bestProvider, 1000, 0, this);
}
}
else
{
//prompt user to enable location....
//.................
}
}
之后，在您的onLocationChanged（位置位置）中 添加这些代码行
@Override
public void onLocationChanged(Location location) {
//Hey, a non null location! Sweet!
//remove location callback:
locationManager.removeUpdates(this);
//open the map:
latitude = location.getLatitude();
longitude = location.getLongitude();
Toast.makeText(MainActivity.this, "latitude:" + latitude + " longitude:" + longitude, Toast.LENGTH_SHORT).show();
searchNearestPlace(voice2text);
}
您就可以出发了！！！！ 欢呼快乐编码
答案 1 :(得分：-1)
如果要连续更新位置，可以使用后台服务。以下代码用于位置服务
public class LocationTracking extends Service {
private static final String TAG = "BOOMBOOMTESTGPS";
private LocationManager mLocationManager = null;
private static final int LOCATION_INTERVAL = 10000;
private static final float LOCATION_DISTANCE = 0;
double latitude; // latitude
double longitude; // longitude
String emp_id=Login.strUserID;;
View view;
private class LocationListener implements android.location.LocationListener
{
Location mLastLocation;
public LocationListener(String provider)
{
Log.e(TAG, "LocationListener " + provider);
mLastLocation = new Location(provider);
}
@Override
public void onLocationChanged(Location location)
{
ConnectivityManager cn = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo nf = cn.getActiveNetworkInfo();
if (nf != null && nf.isConnected() == true) {
Log.e(TAG, "onLocationChanged: " + location);
latitude=location.getLatitude();
longitude=location.getLongitude();
SendQueryString(latitude,longitude);
Log.d("tag","lat"+latitude+"Long"+longitude+"");
Toast.makeText(LocationTracking.this,"Lat and Long"+location+"emp_id"+emp_id+"",Toast.LENGTH_LONG).show();
mLastLocation.set(location);
}else{
Toast.makeText(LocationTracking.this,"Bad network",Toast.LENGTH_LONG).show();
showErrorToast(view);
}
}
public void showErrorToast(View view) {
MDToast.makeText(LocationTracking.this, "Bad Network Connection", MDToast.LENGTH_LONG, MDToast.TYPE_ERROR);
}
@Override
public void onProviderDisabled(String provider)
{
Log.e(TAG, "onProviderDisabled: " + provider);
}
@Override
public void onProviderEnabled(String provider)
{
Log.e(TAG, "onProviderEnabled: " + provider);
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras)
{
Log.e(TAG, "onStatusChanged: " + provider);
}
}
LocationListener[] mLocationListeners = new LocationListener[] {
new LocationListener(LocationManager.GPS_PROVIDER),
//new LocationListener(LocationManager.NETWORK_PROVIDER)
};
@Override
public IBinder onBind(Intent arg0)
{
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
Log.e(TAG, "onStartCommand");
super.onStartCommand(intent, flags, startId);
return START_STICKY;
}
@Override
public void onCreate()
{
Log.e(TAG, "onCreate");
initializeLocationManager();
/* try {
mLocationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE,
mLocationListeners[1]);
} catch (java.lang.SecurityException ex) {
Log.i(TAG, "fail to request location update, ignore", ex);
} catch (IllegalArgumentException ex) {
Log.d(TAG, "network provider does not exist, " + ex.getMessage());
}*/
try {
mLocationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE,
mLocationListeners[0]);
} catch (java.lang.SecurityException ex) {
Log.i(TAG, "fail to request location update, ignore", ex);
} catch (IllegalArgumentException ex) {
Log.d(TAG, "gps provider does not exist " + ex.getMessage());
}
}
@Override
public void onDestroy()
{
Log.e(TAG, "onDestroy");
super.onDestroy();
if (mLocationManager != null) {
for (int i = 0; i < mLocationListeners.length; i++) {
try {
mLocationManager.removeUpdates(mLocationListeners[i]);
} catch (Exception ex) {
Log.i(TAG, "fail to remove location listners, ignore", ex);
}
}
}
}
private void initializeLocationManager() {
Log.e(TAG, "initializeLocationManager");
if (mLocationManager == null) {
mLocationManager = (LocationManager)getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
}
}
像这样在MainActivity中调用此服务
try {
startService(new Intent(RegularCustomerBilling.this, LocationTracking.class));
} catch (Exception e) {
}
And in manifest mention that service
<service
android:name=".LocationTracking"
android:enabled="true"
android:exported="true" />