我想通过JSON数据显示纬度和经度，但每次我获得纬度和经度的0值。我谷歌它并发现我必须添加运行时权限才能解决，但我无法解决问题。如何解决这个问题？
GpsLocation类
public class GpsLocation extends Service implements LocationListener {
private final Context mContext;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
double speed, direction;
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
// Declaring a Location Manager
protected LocationManager locationManager;
public GpsLocation(Context context) {
this.mContext = context;
getLocation();
}
public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
// First get location from Network Provider
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
*/
public void stopUsingGPS() {
if(locationManager != null){
locationManager.removeUpdates(GpsLocation.this);
}
}
/**
* Function to get latitude
*/
public double getLatitude() {
if (location != null) {
latitude = location.getLatitude();
}
// return latitude
return latitude;
}
/**
* Function to get longitude
*/
public double getLongitude() {
if (location != null) {
longitude = location.getLongitude();
}
// return longitude
return longitude;
}
public double getSpeed() {
return speed;
}
public double getDirection() {
return direction;
}
/**
* Function to check GPS/wifi enabled
*
* @return boolean
*/
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog
* On pressing Settings button will launch Settings Options
*/
public void showSettingsAlert() {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});
// on pressing cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
@Override
public void onLocationChanged(Location location) {
if (location != null) {
speed = location.getSpeed();
direction = location.getBearing();
}
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}
}
NearMe
public class NearMe extends Fragment {
MapView mMapView;
private GoogleMap googleMap;
GpsLocation gpsLocation;
double longitude, latitude;
private ProgressDialog pDialog;
ArrayList<MySchool> al_school = new ArrayList<MySchool>();
ArrayList<MyCollege> al_college = new ArrayList<MyCollege>();
ArrayList<MyUniversity> al_university = new ArrayList<MyUniversity>();
private static final String TAG = NearMe.class.getSimpleName();
private static final String urlSchool = "http://www.myeducationhunt.com/api/v1/schools";
private static final String urlCollege = "http://www.myeducationhunt.com/api/v1/colleges";
private static final String urlUniversity = "http://www.myeducationhunt.com/api/v1/universities";
Context mContext;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
final View v = inflater.inflate(R.layout.fragment_near_me, container, false);
final LocationManager locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
if (isConnected()) {
if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
Toast.makeText(getContext(), "GPS is Enabled in your device", Toast.LENGTH_SHORT).show();
mMapView = (MapView) v.findViewById(R.id.mapView);
mMapView.onCreate(savedInstanceState);
mMapView.onResume();
try {
MapsInitializer.initialize(getActivity().getApplicationContext());
} catch (Exception e) {
e.printStackTrace();
}
gpsLocation = new GpsLocation(getContext());
if (gpsLocation.canGetLocation()) {
latitude = gpsLocation.getLatitude();
longitude = gpsLocation.getLongitude();
Toast.makeText(getContext(), "latitude:" + latitude + "Longitude:" + longitude, Toast.LENGTH_LONG).show();
} else {
gpsLocation.showSettingsAlert();
}
pDialog = new ProgressDialog(getContext());
pDialog.setMessage("Loading…");
pDialog.show();
mMapView.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(GoogleMap mMap) {
googleMap = mMap;
// CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLng(new LatLng(gpsLocation.getLatitude(), gpsLocation.getLongitude()));
// CameraUpdate zoom = CameraUpdateFactory.zoomTo(14);
// mMap.moveCamera(cameraUpdate);
// mMap.animateCamera(zoom);
// mMap.animateCamera(cameraUpdate);
LatLng schoollatlng = new LatLng(latitude, longitude);
googleMap.addMarker(new MarkerOptions().position(schoollatlng).title("MyLocation"));
CameraPosition cameraPosition = new CameraPosition.Builder().target(schoollatlng).zoom(10).build();
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(gpsLocation.getLatitude(), gpsLocation.getLongitude()), 14.0f));
drawSchoolMarker();
drawCollegeMarker();
drawUniversityMarker();
}
});
} else {
showGPSDisabledAlertToUser();
}
} else {
Toast.makeText(getContext(), "Please check your internet connection", Toast.LENGTH_LONG).show();
}
return v;
}
public boolean isConnected() {
ConnectivityManager connMgr = (ConnectivityManager) getActivity().getSystemService(Activity.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected())
return true;
else
return false;
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
private void drawSchoolMarker() {
JsonArrayRequest schoolRequest = new JsonArrayRequest(urlSchool,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
hidePDialog();
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
MySchool school = new MySchool();
school.setId(obj.getInt("id") + " ");
school.setName(obj.getString("name"));
if (obj.getString("latitude") == "null") {
school.setLatitude(Double.parseDouble("27.6712"));
} else {
school.setLatitude(Double.parseDouble(obj.getString("latitude")));
}
if (obj.getString("longitude") == "null") {
school.setLongitude(Double.parseDouble("85.2865"));
} else {
school.setLongitude(Double.parseDouble(obj.getString("longitude")));
}
al_school.add(school);
} catch (JSONException e) {
e.printStackTrace();
}
}
//iterate from arraylist
for (MySchool schoolItr : al_school) {
View marker = ((LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.custom_marker, null);
TextView numTxt = (TextView) marker.findViewById(R.id.num_txt);
numTxt.setText(schoolItr.getName());
LatLng latlng = new LatLng(schoolItr.getLatitude(), schoolItr.getLongitude());
googleMap.addMarker(new MarkerOptions().position(latlng).icon(BitmapDescriptorFactory.fromBitmap(createDrawableFromView(getContext(), marker))).title(schoolItr.getName()));
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(schoolRequest);
}
private void drawCollegeMarker() {
JsonArrayRequest collegeRequest = new JsonArrayRequest(urlCollege,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
hidePDialog();
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
MyCollege college = new MyCollege();
college.setId("" + obj.getInt("id"));
college.setName("" + obj.getString("name"));
//college.setLatitude(Double.parseDouble("" + obj.getDouble("latitude")));
//college.setLongitude(Double.parseDouble("" + obj.getDouble("longitude")));
if (obj.getString("latitude") == "null") {
college.setLatitude(Double.parseDouble("27.6712"));
} else {
college.setLatitude(Double.parseDouble(obj.getString("latitude")));
}
if (obj.getString("longitude") == "null") {
college.setLongitude(Double.parseDouble("27.6712"));
} else {
college.setLongitude(Double.parseDouble(obj.getString("longitude")));
}
al_college.add(college);
} catch (JSONException e) {
e.printStackTrace();
}
}
//iterate from arraylist
for (MyCollege collegeItr : al_college) {
View marker = ((LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.custom_marker_college, null);
TextView numTxt = (TextView) marker.findViewById(R.id.txt_college);
numTxt.setText(collegeItr.getName());
LatLng latlng = new LatLng(collegeItr.getLatitude(), collegeItr.getLongitude());
googleMap.addMarker(new MarkerOptions().position(latlng).icon(BitmapDescriptorFactory.fromBitmap(createDrawableFromView(getContext(), marker))).title(collegeItr.getName()));
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(collegeRequest);
}
private void drawUniversityMarker() {
JsonArrayRequest uniRequest = new JsonArrayRequest(urlUniversity,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
hidePDialog();
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
MyUniversity university = new MyUniversity();
university.setId("" + obj.getInt("id"));
university.setName("" + obj.getString("name"));
//university.setLatitude(Double.parseDouble("" + obj.getDouble("latitude")));
//university.setLongitude(Double.parseDouble("" + obj.getDouble("longitude")));
if (obj.getString("latitude") == "null") {
university.setLatitude(Double.parseDouble("27.6712"));
} else {
university.setLatitude(Double.parseDouble(obj.getString("latitude")));
}
if (obj.getString("longitude") == "null") {
university.setLongitude(Double.parseDouble("27.6712"));
} else {
university.setLongitude(Double.parseDouble(obj.getString("longitude")));
}
al_university.add(university);
} catch (JSONException e) {
e.printStackTrace();
}
}
//iterate from arraylist
for (MyUniversity universityItr : al_university) {
View marker = ((LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.custom_marker_university, null);
TextView numTxt = (TextView) marker.findViewById(R.id.txt_university);
numTxt.setText(universityItr.getName());
LatLng latlng = new LatLng(universityItr.getLatitude(), universityItr.getLongitude());
googleMap.addMarker(new MarkerOptions().position(latlng).icon(BitmapDescriptorFactory.fromBitmap(createDrawableFromView(getContext(), marker))).title(universityItr.getName()));
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(uniRequest);
}
public static Bitmap createDrawableFromView(Context context, View view) {
DisplayMetrics displayMetrics = new DisplayMetrics();
((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
view.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
view.measure(displayMetrics.widthPixels, displayMetrics.heightPixels);
view.layout(0, 0, displayMetrics.widthPixels, displayMetrics.heightPixels);
view.buildDrawingCache();
Bitmap bitmap = Bitmap.createBitmap(view.getMeasuredWidth(), view.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
view.draw(canvas);
return bitmap;
}
private void showGPSDisabledAlertToUser() {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());
alertDialogBuilder.setMessage("GPS is disabled in your device. Would you like to enable it?")
.setCancelable(false)
.setPositiveButton("Goto Settings Page To Enable GPS",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Intent callGPSSettingIntent = new Intent(
android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(callGPSSettingIntent);
}
});
alertDialogBuilder.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert = alertDialogBuilder.create();
alert.show();
}
}
Logcat 显示 java.lang.SecurityException的问题：“网络”位置提供程序需要ACCESS_COARSE_LOCATION或ACCESS_FINE_LOCATION权限。
04-30 14:42:43.089 13948-13948/com.example.user.educationhunt W/System.err: java.lang.SecurityException: "network" location provider requires ACCESS_COARSE_LOCATION or ACCESS_FINE_LOCATION permission.
04-30 14:42:43.089 13948-13948/com.example.user.educationhunt W/System.err: at android.os.Parcel.readException(Parcel.java:1620)
04-30 14:42:43.089 13948-13948/com.example.user.educationhunt W/System.err: at android.os.Parcel.readException(Parcel.java:1573)
04-30 14:42:43.089 13948-13948/com.example.user.educationhunt W/System.err: at android.location.ILocationManager$Stub$Proxy.requestLocationUpdates(ILocationManager.java:606)
04-30 14:42:43.090 13948-13948/com.example.user.educationhunt W/System.err: at android.location.LocationManager.requestLocationUpdates(LocationManager.java:880)
04-30 14:42:43.090 13948-13948/com.example.user.educationhunt W/System.err: at android.location.LocationManager.requestLocationUpdates(LocationManager.java:464)
04-30 14:42:43.090 13948-13948/com.example.user.educationhunt W/System.err: at com.example.user.educationhunt.pojos.GpsLocation.getLocation(GpsLocation.java:74)
04-30 14:42:43.090 13948-13948/com.example.user.educationhunt W/System.err: at com.example.user.educationhunt.pojos.GpsLocation.<init>(GpsLocation.java:55)
04-30 14:42:43.090 13948-13948/com.example.user.educationhunt W/System.err: at com.example.user.educationhunt.fragment.NearMe.onCreateView(NearMe.java:128)
04-30 14:42:43.090 13948-13948/com.example.user.educationhunt W/System.err: at android.support.v4.app.Fragment.performCreateView(Fragment.java:2080)
04-30 14:42:43.090 13948-13948/com.example.user.educationhunt W/System.err: at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1108)
04-30 14:42:43.090 13948-13948/com.example.user.educationhunt W/System.err: at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1290)
04-30 14:42:43.090 13948-13948/com.example.user.educationhunt W/System.err: at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:801)
04-30 14:42:43.090 13948-13948/com.example.user.educationhunt W/System.err: at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1677)
04-30 14:42:43.090 13948-13948/com.example.user.educationhunt W/System.err: at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:536)
04-30 14:42:43.090 13948-13948/com.example.user.educationhunt W/System.err: at android.os.Handler.handleCallback(Handler.java:746)
04-30 14:42:43.090 13948-13948/com.example.user.educationhunt W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
04-30 14:42:43.090 13948-13948/com.example.user.educationhunt W/System.err: at android.os.Looper.loop(Looper.java:148)
04-30 14:42:43.090 13948-13948/com.example.user.educationhunt W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5443)
04-30 14:42:43.090 13948-13948/com.example.user.educationhunt W/System.err: at java.lang.reflect.Method.invoke(Native Method)
04-30 14:42:43.090 13948-13948/com.example.user.educationhunt W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
04-30 14:42:43.090 13948-13948/com.example.user.educationhunt W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)