3
Ich mache eine Kartenanwendung, wo ich die Route zwischen zwei Punkten (dynamisch) zeige. Dabei erhalte ich Längen- und Breitengrade von der Datenbank (was sich mit der Zeit ändern kann). Dies ist ein College-Projekt, also habe ich nicht am Sicherheitsteil gearbeitet. Dies ist die Java-Datei für die Navigation:PolylineOptions kann nicht null sein
public class NavigationActivity extends AppCompatActivity implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
GoogleMap.OnMarkerDragListener,
GoogleMap.OnMapLongClickListener,
LocationListener {
private GoogleMap mMap;
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
Marker mCurrLocationMarker;
LocationRequest mLocationRequest;
private double longitude;
private double latitude;
private double fromLongitude;
private double fromLatitude;
private double toLongitude;
private double toLatitude;
private static final String LOGIN_URL = "http://192.168.211.1/xyz/lat.php";
private static final String LOGIN_URLS = "http://192.168.211.1/xyz/lng.php";
public static final String KEY_MYNAME = "User";
public static final String LAT = "lat";
public static final String LANG = "lang";
public LocationManager locationManager;
public Criteria criteria;
public String bestProvider;
private static final String TAG = NavigationActivity.class.getSimpleName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_navigation);
getLocation();
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
checkLocationPermission();
}
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
public static boolean isLocationEnabled(Context context)
{
return true;
}
protected void getLocation() {
if (isLocationEnabled(NavigationActivity.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(NavigationActivity.this, "latitude:" + latitude + " longitude:" + longitude, Toast.LENGTH_SHORT).show();
//Trying to send the data to the database
final StringRequest stringrequest=new StringRequest(Request.Method.POST,LOGIN_URL,new Response.Listener<String>(){
@Override
public void onResponse(String s) {
if (!s.equalsIgnoreCase("updated")) {
Toast.makeText(getApplicationContext(), s, Toast.LENGTH_SHORT).show();
getPoints();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
Toast.makeText(getApplicationContext(), volleyError.toString(), Toast.LENGTH_LONG).show();
}
}){
protected Map<String,String> getParams(){
Map<String,String>params=new HashMap<String, String>();
SharedPreferences sharedPreferences = NavigationActivity.this.getSharedPreferences(Config.SHARED_PREF_NAME, Context.MODE_PRIVATE);
String KEY_MYUSERNAME = sharedPreferences.getString(Config.EMAIL_SHARED_PREF, "Not Found");
params.put(LAT, String.valueOf(latitude));
params.put(LANG, String.valueOf(longitude));
params.put(KEY_MYNAME, KEY_MYUSERNAME);
return params;
}
};
RequestQueue requestQueue= Volley.newRequestQueue(this);
requestQueue.add(stringrequest);
} else {
//This is what you need:
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, 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.
return;
}
locationManager.requestLocationUpdates(bestProvider, 1000, 0, this);
}
}
else
{
//prompt user to enable location....
//.................
}
}
@Override
protected void onStart() {
mGoogleApiClient.connect();
super.onStart();
}
@Override
protected void onStop() {
mGoogleApiClient.disconnect();
super.onStop();
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
//Initialize Google Play Services
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
} else {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
}
@Override
public void onConnected(Bundle bundle) {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
// if (ContextCompat.checkSelfPermission(this,
// Manifest.permission.ACCESS_FINE_LOCATION)
// == PackageManager.PERMISSION_GRANTED) {
// LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
// }
}
private void getPoints() {
//Getting the URL
fromLatitude = latitude;
fromLongitude = longitude;
//To get to latitude
StringRequest stringRequests = new StringRequest(Request.Method.POST, LOGIN_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
if (response.equalsIgnoreCase("Connection Error")) {
Toast.makeText(NavigationActivity.this, response, Toast.LENGTH_SHORT).show();
}
else {
toLatitude = Double.parseDouble(response);
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(NavigationActivity.this, error.toString(), Toast.LENGTH_LONG).show();
}
}) {
@Override
protected Map<String, String> getParams() {
SharedPreferences sharedPreferences = NavigationActivity.this.getSharedPreferences(Config.SHARED_PREF_NAME, Context.MODE_PRIVATE);
String KEY_MYUSERNAME = sharedPreferences.getString(Config.EMAIL_SHARED_PREF,"Not Found");
Map<String,String> params = new HashMap<String, String>();
params.put(KEY_MYNAME,KEY_MYUSERNAME);
return params;
}
};
RequestQueue requestQueues = Volley.newRequestQueue(this);
requestQueues.add(stringRequests);
StringRequest stringRequestss = new StringRequest(Request.Method.POST, LOGIN_URLS,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
if (response.equalsIgnoreCase("Connection Error")) {
Toast.makeText(NavigationActivity.this, response, Toast.LENGTH_SHORT).show();
}
else {
toLongitude = Double.parseDouble(response);
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(NavigationActivity.this, error.toString(), Toast.LENGTH_LONG).show();
}
}) {
@Override
protected Map<String, String> getParams() {
SharedPreferences sharedPreferences = NavigationActivity.this.getSharedPreferences(Config.SHARED_PREF_NAME, Context.MODE_PRIVATE);
String KEY_MYUSERNAME = sharedPreferences.getString(Config.EMAIL_SHARED_PREF,"Not Found");
Map<String,String> params = new HashMap<String, String>();
params.put(KEY_MYNAME,KEY_MYUSERNAME);
return params;
}
};
RequestQueue requestQueuess = Volley.newRequestQueue(this);
requestQueuess.add(stringRequestss);
getDirections();
}
private void getDirections() {
double flat = fromLatitude;
double flong = fromLongitude;
double tlat = toLatitude;
double tlong = toLongitude;
LatLng origin = new LatLng(flat, flong);
LatLng dest = new LatLng(tlat, tlong);
String url = getDirectionsUrl(origin, dest);
DownloadTask downloadTask = new DownloadTask();
// Start downloading json data from Google Directions API
downloadTask.execute(url);
}
private String getDirectionsUrl(LatLng origin,LatLng dest){
// Origin of route
String str_origin = "origin="+origin.latitude+","+origin.longitude;
// Destination of route
String str_dest = "destination="+dest.latitude+","+dest.longitude;
// Sensor enabled
String sensor = "sensor=false";
// Building the parameters to the web service
String parameters = str_origin+"&"+str_dest+"&"+sensor;
// Output format
String output = "json";
// Building the url to the web service
String url = "https://maps.googleapis.com/maps/api/directions/"+output+"?"+parameters;
return url;
}
private String downloadUrl(String strUrl) throws IOException{
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try{
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while((line = br.readLine()) != null){
sb.append(line);
}
data = sb.toString();
br.close();
}catch(Exception e){
}finally{
iStream.close();
urlConnection.disconnect();
}
return data;
}
// Fetches data from url passed
private class DownloadTask extends AsyncTask<String, Void, String> {
// Downloading data in non-ui thread
@Override
protected String doInBackground(String... url) {
// For storing data from web service
String data = "";
try{
// Fetching the data from web service
data = downloadUrl(url[0]);
}catch(Exception e){
Log.d("Background Task",e.toString());
}
return data;
}
// Executes in UI thread, after the execution of
// doInBackground()
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
ParserTask parserTask = new ParserTask();
// Invokes the thread for parsing the JSON data
parserTask.execute(result);
}
}
/** A class to parse the Google Places in JSON format */
private class ParserTask extends AsyncTask<String, Integer, List<List<HashMap<String,String>>> >{
// Parsing the data in non-ui thread
@Override
protected List<List<HashMap<String, String>>> doInBackground(String... jsonData) {
JSONObject jObject;
List<List<HashMap<String, String>>> routes = null;
try{
jObject = new JSONObject(jsonData[0]);
DirectionsJSONParser parser = new DirectionsJSONParser();
// Starts parsing data
routes = parser.parse(jObject);
}catch(Exception e){
e.printStackTrace();
}
return routes;
}
// Executes in UI thread, after the parsing process
@Override
protected void onPostExecute(List<List<HashMap<String, String>>> result) {
ArrayList<LatLng> points = null;
PolylineOptions lineOptions = null;
MarkerOptions markerOptions = new MarkerOptions();
// Traversing through all the routes
for(int i=0;i<result.size();i++){
points = new ArrayList<LatLng>();
lineOptions = new PolylineOptions();
// Fetching i-th route
List<HashMap<String, String>> path = result.get(i);
// Fetching all the points in i-th route
for(int j=0;j<path.size();j++){
HashMap<String,String> point = path.get(j);
double lat = Double.parseDouble(point.get("lat"));
double lng = Double.parseDouble(point.get("lng"));
LatLng position = new LatLng(lat, lng);
points.add(position);
}
// Adding all the points in the route to LineOptions
lineOptions.addAll(points);
lineOptions.width(2);
lineOptions.color(Color.RED);
}
// Drawing polyline in the Google Map for the i-th route
mMap.addPolyline(lineOptions);
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onLocationChanged(final Location location) {
getLocation();
mLastLocation = location;
if (mCurrLocationMarker != null) {
mCurrLocationMarker.remove();
}
//Place current location marker
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("Current Position");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
mCurrLocationMarker = mMap.addMarker(markerOptions);
Toast.makeText(NavigationActivity.this, String.valueOf(location.getLatitude()), Toast.LENGTH_LONG).show();
//move map camera
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(11));
//stop location updates
if (mGoogleApiClient != null) { LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, (com.google.android.gms.location.LocationListener) this);
}
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Toast.makeText(NavigationActivity.this, "Connection Lost", Toast.LENGTH_LONG).show();
}
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
public boolean checkLocationPermission() {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// Asking user if explanation is needed
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_FINE_LOCATION)) {
// Show an explanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission
//Prompt the user once explanation has been shown
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
}
return false;
} else {
return true;
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_LOCATION: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted. Do the
// contacts-related task you need to do.
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
if (mGoogleApiClient == null) {
buildGoogleApiClient();
}
mMap.setMyLocationEnabled(true);
}
} else {
// Permission denied, Disable the functionality that depends on this permission.
Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show();
}
return;
}
}
}
}
Das ist mein logcat:
03-24 15:00:51.174 9970-9970/com.xyz.user.xyz E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.xyz.user.xyz, PID: 9970
java.lang.NullPointerException: PolylineOptions cannot be null.
at com.google.maps.api.android.lib6.common.k.a(:com.google.android.gms.DynamiteModulesB:42)
at com.google.maps.api.android.lib6.impl.dp.<init>(:com.google.android.gms.DynamiteModulesB:146)
at com.google.maps.api.android.lib6.impl.az.a(:com.google.android.gms.DynamiteModulesB:931)
at com.google.android.gms.maps.internal.l.onTransact(:com.google.android.gms.DynamiteModulesB:137)
at android.os.Binder.transact(Binder.java:380)
at com.google.android.gms.maps.internal.IGoogleMapDelegate$zza$zza.addPolyline(Unknown Source)
at com.google.android.gms.maps.GoogleMap.addPolyline(Unknown Source)
at com.xyz.user.xyz.NavigationActivity$ParserTask.onPostExecute(NavigationActivity.java:474)
at com.xyz.user.xyz.NavigationActivity$ParserTask.onPostExecute(NavigationActivity.java:420)
at android.os.AsyncTask.finish(AsyncTask.java:636)
at android.os.AsyncTask.access$500(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:653)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5343)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)
Kann mir jemand eine Lösung vorschlagen?
Ich habe versucht, den Code unten zu verwenden:
if(lineOptions!=null)
{
mMap.addPolyline(lineOptions);
}
Der obige Code aus der App von nicht abstürzt hilft, aber es hilft mir immer noch nicht die Strecke zwischen diesen Punkten zu zeichnen.
Die abgerufenen Daten sind korrekt, ich habe das mit dem Toast überprüft.
Jede Hilfe wird geschätzt.
Haben Sie versucht, ** & key = YOUR_API_KEY ** am Ende Ihrer URL hinzuzufügen? –