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Ich versuche, dem Benutzer nur die Dauer zwischen zwei Standorten mit Breiten- und Längengrad anzuzeigen. Ich habe Probleme mit Berechtigungen, von denen ich nicht sicher bin, wie ich damit umgehen soll.Wie wird die Dauer mit Google Maps angezeigt?
Hier ist mein doInBackground Code:
protected String[] doInBackground(String... params) {
try {
LocationManager locationManager = (LocationManager) MyCustomHomeActivity.this
.getSystemService(LOCATION_SERVICE);
// getting GPS status
boolean isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
boolean isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (locationManager != null) {
location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
String shuLat = "41.2207188";
String shuLong = "-73.24168179999999";
String forecastJsonStr = null;
String myUrlSetup = "https://maps.googleapis.com/maps/api/directions/json?origin="+latitude + "," + longitude +"&destination="+shuLat +"," + shuLong + "&departure_time=now&traffic_model=best_guess&key=AIzaSyB6l8vrnspw2-1Q_cnzO03JlAsIOMl-7bs";
HttpURLConnection urlConnection = null;
BufferedReader reader = null;
try {
URL url;
url = new URL(myUrlSetup);
// Create the request to GoogleMapAPI, and open the connection
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.connect();
// Read the input stream into a String
InputStream inputStream = urlConnection.getInputStream();
StringBuffer buffer = new StringBuffer();
if (inputStream == null) {
// Nothing to do.
return null;
}
System.out.println("I am in doInBackground step3");
reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null) {
// Since it's JSON, adding a newline isn't necessary (it won't affect parsing)
// But it does make debugging a *lot* easier if you print out the completed
// buffer for debugging.
buffer.append(line + "\n");
}
if (buffer.length() == 0) {
// Stream was empty. No point in parsing.
return null;
}
forecastJsonStr = buffer.toString();
Log.v(LOG_TAG, "Forecast string: " + forecastJsonStr);
} catch (IOException e) {
Log.e(LOG_TAG, "Error ", e);
// If the code didn't successfully get the weather data, there's no point in attemping
// to parse it.
return null;
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
if (reader != null) {
try {
reader.close();
} catch (final IOException e) {
Log.e(LOG_TAG, "Error closing stream", e);
}
}
}
try {
System.out.println("I am just in front of calling getDurationDataFromJson");
return getDurationDataFromJson(forecastJsonStr);
} catch (JSONException e) {
Log.e(LOG_TAG, e.getMessage(), e);
e.printStackTrace();
}
return new String[0];
}//end doInBackground
Hier ist mein getDurationDataFromJSON Code:
private String[] getDurationDataFromJson(String forecastJsonStr)
throws JSONException {
// These are the names of the JSON objects that need to be extracted.
final String OWM_ROUTES = "routes";
final String OWM_LEGS = "legs";
final String OWM_DURATION = "duration";
final String OWM_TEXT = "text";
String[] resultStrs = new String[0];
String duration;
JSONObject durationJson = new JSONObject(forecastJsonStr);
JSONArray routeArray = durationJson.getJSONArray(OWM_ROUTES);
JSONArray legArray = routeArray.getJSONObject(0).getJSONArray(OWM_LEGS);
//Duration
JSONObject durationObj = legArray.getJSONObject(0).getJSONObject(OWM_DURATION);
duration = durationObj.getString(OWM_TEXT);
resultStrs[0] = duration;
System.out.println("Duration is: " + duration);
for (String s : resultStrs) {
System.out.println("Duration entry: " + s);
Log.v(LOG_TAG, "Duration entry: " + s);
}
return resultStrs;
}
Ärger Ich bin vor ist der folgende Teil in doInBackGround Code: Fehler
location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
ist:
Call requires permission which may be rejected by user: code should explicitly check to see if permission is available(with `check permission`) or explicitly handle a potential `SecurityException`.
Ich bin mir nicht sicher, ob ich in die richtige Richtung gehe. Bitte führe mich durch das.
Können Sie Ihre Berechtigungen von Manifest zeigen? Welche Betriebssystemversion versuchen Sie? Kennen Sie sich seit API23 mit der neuen permission api aus? – snachmsm
check out [https://developer.android.com/training/permissions/request.html.html (http://developer.android.com/training/permissions/requesting.html) – snachmsm