我无法在4.4.2版本的谷歌地图中显示确切的位置。还在哪里添加运行时权限？请帮忙
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() {
if (Build.VERSION.SDK_INT >= 23 &&
ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
}
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) {
if (isGPSEnabled) {
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 (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) {
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.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课程
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.**.com/api/v1/schools";
private static final String urlCollege = "http://www.**.com/api/v1/colleges";
private static final String urlUniversity = "http://www.**.com/api/v1/universities";
@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()) {
longitude = gpsLocation.getLongitude();
latitude = gpsLocation.getLatitude();
Toast.makeText(getContext(), "latitude:" + latitude + "Longitude:" + longitude, Toast.LENGTH_LONG).show();
}
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(11).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();
}
}
确切的问题在哪里？为什么地图没有显示在SDK 23之上？版本
答案 0 :(得分：1)
尝试添加这段代码：
if (Build.VERSION.SDK_INT >= 23 &&
ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// this says , Permissions are not granted , so ask for permissions here if not granted and look out for permission callback if user grants
}
答案 1 :(得分：1)
你可能从某个地方复制的代码显然甚至都有关于如何执行此操作的注释。
您只能检查权限，但您从未请求。因此，您永远不会获得位置许可。
的详细信息，请参阅Android文档答案 2 :(得分：1)
覆盖
onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults)
您的活动的方法，如果已授予权限，则执行基于位置的工作。
https://developer.android.com/training/permissions/requesting.html
答案 3 :(得分：1)
您可以通过以下代码
申请权限if(Build.VERSION.SDK_INT >= 23)
if (ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(MenuActivity.this, Manifest.permission.ACCESS_FINE_LOCATION)) {
// permission wasn't granted
} else {
ActivityCompat.requestPermissions(MenuActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_CODE_PERMISSION);
}
if (ActivityCompat.shouldShowRequestPermissionRationale(MenuActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION)) {
// permission wasn't granted
} else {
ActivityCompat.requestPermissions(MenuActivity.this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, REQUEST_CODE_PERMISSIONN);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
if (requestCode == REQUEST_CODE_PERMISSION) {
if (grantResults.length >= 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted
} else {
// permission wasn't granted
}
}
if (requestCode == REQUEST_CODE_PERMISSIONN) {
if (grantResults.length >= 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted
} else {
// permission wasn't granted
}
}
}
将以下属性添加到清单
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-feature android:name="android.hardware.location.gps" />
答案 4 :(得分：1)
高于API级别23，您将获得实用的许可，如：
将SEND_SMS权限更改为您的Google地图权限
private static final int PERMISSION_REQUEST_CODE = 1;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
if (checkSelfPermission(Manifest.permission.SEND_SMS)
== PackageManager.PERMISSION_DENIED) {
Log.d("permission", "permission denied to SEND_SMS - requesting it");
String[] permissions = {Manifest.permission.SEND_SMS};
requestPermissions(permissions, PERMISSION_REQUEST_CODE);
}
}
答案 5 :(得分：0)
在getLocation方法中。
public Location getLocation() {
if (ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(getActivity(),new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION}, REQUEST_CODE);
}
//Do your thing
}
并在您的活动/片段中听取授予或拒绝覆盖函数onRequestPermissionsResult（）的权限
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
您使用的方法似乎也有点旧。请查看此链接 https://developer.android.com/training/location/receive-location-updates.html
答案 6 :(得分：0)
每当getLocation()方法调用时，它总是根据您的代码检查权限
if (Build.VERSION.SDK_INT >= 23 &&
ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
}
如果未在清单文件中调用权限，则表示您没有提及所需的权限，如果未获得权限，则可能是第一个检查地点不会调用请求权限
<强>更新
我刚检查过，如果您未在Manifest文件中提及权限，则不会要求许可
两者将合并并要求单一许可
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
将此两个权限添加到Manifest文件
将此代码添加到getLocation()方法开头
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions((MainActivity.this), new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION}, REQ_PERMISSION_CODE);
return;
}
}
直到获得权限才会执行该方法
*原谅我的英语