在 Google 地图片段中显示当前位置 [英] Show Current Location inside Google Map Fragment
本文介绍了在 Google 地图片段中显示当前位置的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我目前正在制作一个带有 Google 地图的 Fragment.一旦用户访问该片段，他的地图应该缩放并专注于他的位置.但是，它显示的是世界地图，而不是附近位置(用户附近):
@SuppressWarnings("未使用")公共类 DeferredMapFragment 扩展 MapFragment 实现 GoogleMap.OnCameraChangeListener、OnMapReadyCallback、GoogleApiClient.ConnectionCallbacks、GoogleApiClient.OnConnectionFailedListener，位置监听器 {private static final String TAG = "DeferredMapFragment";私有双端队列<Runnable>待处理的动作；private AbstractMap<Marker, Object>标签；私人谷歌地图；私有 LocationRequest mLlocationRequest;私人 GoogleApiClient mGoogleApiClient;私人位置 mLastLocation；私人标记标记；私人 GoogleMap.OnCameraChangeListener cameraChangeListener = null;私有布尔 isMapReady = false;/** 内部*/@覆盖public void onActivityCreated(Bundle savedInstanceState) {super.onActivityCreated(savedInstanceState);如果(getMap()！= null){地图 = getMap();getMap().setOnCameraChangeListener(this);}}@覆盖公共无效 onCameraChange(CameraPosition cameraPosition) {isMapReady = true;如果(pendingActions ！= null){int i = pendingActions.size();而 (i > 0) {pendingActions.pop().run();- 一世;}}if (cameraChangeListener != null) {cameraChangeListener.onCameraChange(cameraPosition);}如果(getMap()！= null){getMap().setOnCameraChangeListener(cameraChangeListener);}}私有无效执行(可运行操作){如果(动作==空){返回;}如果(isMapReady){动作.运行()；} 别的 {如果(pendingActions == null){pendingActions = new LinkedList<>();}pendingActions.add(action);}}/** 标记*/私有无效 addTag(标记键，对象值){如果(标签 == 空){标签 = 新的 HashMap<>();}标签.放置(键，值)；}公共对象getTag(标记键){返回标签 != null ?tags.get(key) : null;}/** 听众*/public void setOnInfoWindowClickListener(最终 GoogleMap.OnInfoWindowClickListener 监听器){执行(新运行(){@覆盖公共无效运行(){getMap().setOnInfoWindowClickListener(listener);}});}公共无效 setOnCameraChangeListener(最终 GoogleMap.OnCameraChangeListener 侦听器){cameraChangeListener = 监听器；}公共无效 setOnMarkerClickListener(最终 GoogleMap.OnMarkerClickListener 侦听器){执行(新运行(){@覆盖公共无效运行(){getMap().setOnMarkerClickListener(listener);}});}public void setOnMapClickListener(final GoogleMap.OnMapClickListener listener) {执行(新运行(){@覆盖公共无效运行(){getMap().setOnMapClickListener(listener);}});}/** 地图叠加*/公共无效 addPolyline(最终 PolylineOptions 选项){执行(新运行(){@覆盖公共无效运行(){getMap().addPolyline(options);}});}公共无效 addPolygon(最终 PolygonOptions 选项){执行(新运行(){@覆盖公共无效运行(){getMap().addPolygon(options);}});}public void addCircle(最终CircleOptions选项){执行(新运行(){@覆盖公共无效运行(){getMap().addCircle(options);}});}public void addMarker(final MarkerOptions options) {添加标记(选项，空)；}public void addMarker(final MarkerOptions options, final Object tag) {执行(新运行(){@覆盖公共无效运行(){标记标记 = getMap().addMarker(options);如果(标签！= null){添加标签(标记，标签)；}}});}公共无效 addGroundOverlay(最终 GroundOverlayOptions 选项){执行(新运行(){@覆盖公共无效运行(){getMap().addGroundOverlay(options);}});}公共无效 addTileOverlay(最终 TileOverlayOptions 选项){执行(新运行(){@覆盖公共无效运行(){getMap().addTileOverlay(options);}});}/** 用户界面设置*/public void setMapToolbarEnabled(final boolean enabled) {执行(新运行(){@覆盖公共无效运行(){getMap().getUiSettings().setMapToolbarEnabled(enabled);}});}public void setPadding(final int left, final int top, final int right, final int bottom) {执行(新运行(){@覆盖公共无效运行(){getMap().setPadding(left, top, right, bottom);}});}公共无效setZoomControlsEnabled(最终布尔启用){执行(新运行(){@覆盖公共无效运行(){getMap().getUiSettings().setZoomControlsEnabled(enabled);}});}public void setCompassEnabled(final boolean enabled) {执行(新运行(){@覆盖公共无效运行(){getMap().getUiSettings().setCompassEnabled(enabled);}});}public void setMyLocationButtonEnabled(final boolean enabled) {执行(新运行(){@覆盖公共无效运行(){getMap().getUiSettings().setMyLocationButtonEnabled(enabled);}});}public void setIndoorLevelPickerEnabled(final boolean enabled) {执行(新运行(){@覆盖公共无效运行(){getMap().getUiSettings().setIndoorLevelPickerEnabled(enabled);}});}公共无效 setScrollGesturesEnabled(启用最终布尔值){执行(新运行(){@覆盖公共无效运行(){getMap().getUiSettings().setScrollGesturesEnabled(enabled);}});}公共无效 setZoomGesturesEnabled(启用最终布尔值){执行(新运行(){@覆盖公共无效运行(){getMap().getUiSettings().setZoomGesturesEnabled(enabled);}});}公共无效 setTiltGesturesEnabled(启用最终布尔值){执行(新运行(){@覆盖公共无效运行(){getMap().getUiSettings().setTiltGesturesEnabled(enabled);}});}公共无效 setRotateGesturesEnabled(启用最终布尔值){执行(新运行(){@覆盖公共无效运行(){getMap().getUiSettings().setRotateGesturesEnabled(enabled);}});}公共无效 setAllGesturesEnabled(启用最终布尔值){执行(新运行(){@覆盖公共无效运行(){getMap().getUiSettings().setAllGesturesEnabled(enabled);}});}public void setInfoWindowAdapter(最终 GoogleMap.InfoWindowAdapter 适配器){执行(新运行(){@覆盖公共无效运行(){getMap().setInfoWindowAdapter(适配器);}});}@覆盖公共无效 onMapReady(GoogleMap googleMap) {地图 = 谷歌地图；设置映射()；}公共无效setUpMap(){map.setMapType(GoogleMap.MAP_TYPE_HYBRID);if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {//TODO: 考虑调用//ActivityCompat#requestPermissions//这里请求缺少的权限，然后覆盖//public void onRequestPermissionsResult(int requestCode, String[] permissions,//int[] grantResults)//处理用户授予权限的情况.查看文档//对于 ActivityCompat#requestPermissions 了解更多详细信息.返回;}map.setMyLocationEnabled(true);}@覆盖公共无效onConnected(捆绑包){mLlocationRequest = 新位置请求()；mLocationRequest.setInterval(1000);mLocationRequest.setFastestInterval(1000);mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);//mLlocationRequest.setSmallestDisplacement(0.1F);if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {//TODO: 考虑调用//ActivityCompat#requestPermissions//这里请求缺少的权限，然后覆盖//public void onRequestPermissionsResult(int requestCode, String[] permissions,//int[] grantResults)//处理用户授予权限的情况.查看文档//对于 ActivityCompat#requestPermissions 了解更多详细信息.返回;}LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);}@覆盖公共无效 onConnectionSuspended(int i) {}@覆盖公共无效onLocationChanged(位置位置){mLastLocation = 位置；//移除之前的当前位置标记如果(标记！= null){标记.remove();}双 dLatitude = mLastLocation.getLatitude();双 dLongitude = mLastLocation.getLongitude();标记 = map.addMarker(new MarkerOptions().position(new LatLng(dLatitude, dLongitude)).title("我的位置").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)));map.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(dLatitude, dLongitude), 8));}@覆盖公共无效 onPause() {super.onPause();如果(mGoogleApiClient ！= null){LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);}}受保护的同步无效 buildGoogleApiClient() {mGoogleApiClient = new GoogleApiClient.Builder(getContext()).addConnectionCallbacks(this).addOnConnectionFailedListener(this).addApi(LocationServices.API).建造();}@覆盖public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {}}有缩放功能吗?我的 api 还允许我访问用户的邮政编码.我可以用它代替吗?我要求向用户显示他附近的位置.
解决方案
这类似于我的
授予位置权限后，使用标记显示当前位置:
如果用户拒绝或撤销位置权限，这将在应用启动时显示:
一、解释:
然后，位置权限请求:
I am currently working on a Fragment with a Google Map in it. Once a user visits that fragment his map should zoom and focus on his location. However, it shows map of the world and not nearby location (near user):
@SuppressWarnings("unused")
public class DeferredMapFragment extends MapFragment implements GoogleMap.OnCameraChangeListener, OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener,
LocationListener {
private static final String TAG = "DeferredMapFragment";
private Deque<Runnable> pendingActions;
private AbstractMap<Marker, Object> tags;
private GoogleMap map;
private LocationRequest mLocationRequest;
private GoogleApiClient mGoogleApiClient;
private Location mLastLocation;
private Marker marker;
private GoogleMap.OnCameraChangeListener cameraChangeListener = null;
private boolean isMapReady = false;
/*
* INTERNALS
*/
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if (getMap() != null) {
map = getMap();
getMap().setOnCameraChangeListener(this);
}
}
@Override
public void onCameraChange(CameraPosition cameraPosition) {
isMapReady = true;
if (pendingActions != null) {
int i = pendingActions.size();
while (i > 0) {
pendingActions.pop().run();
--i;
}
}
if (cameraChangeListener != null) {
cameraChangeListener.onCameraChange(cameraPosition);
}
if (getMap() != null) {
getMap().setOnCameraChangeListener(cameraChangeListener);
}
}
private void execute(Runnable action) {
if (action == null) {
return;
}
if (isMapReady) {
action.run();
} else {
if (pendingActions == null) {
pendingActions = new LinkedList<>();
}
pendingActions.add(action);
}
}
/*
* TAGGING
*/
private void addTag(Marker key, Object value) {
if (tags == null) {
tags = new HashMap<>();
}
tags.put(key, value);
}
public Object getTag(Marker key) {
return tags != null ? tags.get(key) : null;
}
/*
* LISTENERS
*/
public void setOnInfoWindowClickListener(final GoogleMap.OnInfoWindowClickListener listener) {
execute(new Runnable() {
@Override
public void run() {
getMap().setOnInfoWindowClickListener(listener);
}
});
}
public void setOnCameraChangeListener(final GoogleMap.OnCameraChangeListener listener) {
cameraChangeListener = listener;
}
public void setOnMarkerClickListener(final GoogleMap.OnMarkerClickListener listener) {
execute(new Runnable() {
@Override
public void run() {
getMap().setOnMarkerClickListener(listener);
}
});
}
public void setOnMapClickListener(final GoogleMap.OnMapClickListener listener) {
execute(new Runnable() {
@Override
public void run() {
getMap().setOnMapClickListener(listener);
}
});
}
/*
* MAP OVERLAYS
*/
public void addPolyline(final PolylineOptions options) {
execute(new Runnable() {
@Override
public void run() {
getMap().addPolyline(options);
}
});
}
public void addPolygon(final PolygonOptions options) {
execute(new Runnable() {
@Override
public void run() {
getMap().addPolygon(options);
}
});
}
public void addCircle(final CircleOptions options) {
execute(new Runnable() {
@Override
public void run() {
getMap().addCircle(options);
}
});
}
public void addMarker(final MarkerOptions options) {
addMarker(options, null);
}
public void addMarker(final MarkerOptions options, final Object tag) {
execute(new Runnable() {
@Override
public void run() {
Marker marker = getMap().addMarker(options);
if (tag != null) {
addTag(marker, tag);
}
}
});
}
public void addGroundOverlay(final GroundOverlayOptions options) {
execute(new Runnable() {
@Override
public void run() {
getMap().addGroundOverlay(options);
}
});
}
public void addTileOverlay(final TileOverlayOptions options) {
execute(new Runnable() {
@Override
public void run() {
getMap().addTileOverlay(options);
}
});
}
/*
* UI SETTINGS
*/
public void setMapToolbarEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setMapToolbarEnabled(enabled);
}
});
}
public void setPadding(final int left, final int top, final int right, final int bottom) {
execute(new Runnable() {
@Override
public void run() {
getMap().setPadding(left, top, right, bottom);
}
});
}
public void setZoomControlsEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setZoomControlsEnabled(enabled);
}
});
}
public void setCompassEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setCompassEnabled(enabled);
}
});
}
public void setMyLocationButtonEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setMyLocationButtonEnabled(enabled);
}
});
}
public void setIndoorLevelPickerEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setIndoorLevelPickerEnabled(enabled);
}
});
}
public void setScrollGesturesEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setScrollGesturesEnabled(enabled);
}
});
}
public void setZoomGesturesEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setZoomGesturesEnabled(enabled);
}
});
}
public void setTiltGesturesEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setTiltGesturesEnabled(enabled);
}
});
}
public void setRotateGesturesEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setRotateGesturesEnabled(enabled);
}
});
}
public void setAllGesturesEnabled(final boolean enabled) {
execute(new Runnable() {
@Override
public void run() {
getMap().getUiSettings().setAllGesturesEnabled(enabled);
}
});
}
public void setInfoWindowAdapter(final GoogleMap.InfoWindowAdapter adapter) {
execute(new Runnable() {
@Override
public void run() {
getMap().setInfoWindowAdapter(adapter);
}
});
}
@Override
public void onMapReady(GoogleMap googleMap) {
map = googleMap;
setUpMap();
}
public void setUpMap() {
map.setMapType(GoogleMap.MAP_TYPE_HYBRID);
if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getContext(), 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;
}
map.setMyLocationEnabled(true);
}
@Override
public void onConnected(Bundle bundle) {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
//mLocationRequest.setSmallestDisplacement(0.1F);
if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getContext(), 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;
}
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onLocationChanged(Location location) {
mLastLocation = location;
//remove previous current location Marker
if (marker != null){
marker.remove();
}
double dLatitude = mLastLocation.getLatitude();
double dLongitude = mLastLocation.getLongitude();
marker = map.addMarker(new MarkerOptions().position(new LatLng(dLatitude, dLongitude))
.title("My Location").icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_RED)));
map.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(dLatitude, dLongitude), 8));
}
@Override
public void onPause() {
super.onPause();
if (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(getContext())
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
}
Is there a zoom feature available? Also my api allows me to access zip code of user. Can I use that instead? I require user to be shown his nearby locations.
解决方案
This is similar to my other answer here, however, this is different due to the fact that you are extending the MapFragment and have your custom behavior implemented inside the Fragment.
Here is an example Fragment that extends SupportMapFragment, on launch it will get the user's current location, place a Marker, and zoom in:
public class MapFragment extends SupportMapFragment
implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener {
GoogleMap mGoogleMap;
SupportMapFragment mapFrag;
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
Marker mCurrLocationMarker;
@Override
public void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
if (mGoogleMap == null) {
getMapAsync(this);
}
}
@Override
public void onPause() {
super.onPause();
//stop location updates when Activity is no longer active
if (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
}
@Override
public void onMapReady(GoogleMap googleMap)
{
mGoogleMap=googleMap;
mGoogleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
//Initialize Google Play Services
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
//Location Permission already granted
buildGoogleApiClient();
mGoogleMap.setMyLocationEnabled(true);
} else {
//Request Location Permission
checkLocationPermission();
}
}
else {
buildGoogleApiClient();
mGoogleMap.setMyLocationEnabled(true);
}
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(getActivity())
.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(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
}
@Override
public void onConnectionSuspended(int i) {}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {}
@Override
public void onLocationChanged(Location location)
{
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 = mGoogleMap.addMarker(markerOptions);
//move map camera
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng,11));
}
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
private void checkLocationPermission() {
if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(),
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.
new AlertDialog.Builder(getActivity())
.setTitle("Location Permission Needed")
.setMessage("This app needs the Location permission, please accept to use location functionality")
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//Prompt the user once explanation has been shown
ActivityCompat.requestPermissions(getActivity(),
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION );
}
})
.create()
.show();
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(getActivity(),
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION );
}
}
}
@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, yay! Do the
// location-related task you need to do.
if (ContextCompat.checkSelfPermission(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
if (mGoogleApiClient == null) {
buildGoogleApiClient();
}
mGoogleMap.setMyLocationEnabled(true);
}
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
Toast.makeText(getActivity(), "permission denied", Toast.LENGTH_LONG).show();
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
}
}
Since the Location permission request needs to go through the Activity, you will need to route the result from the Activity to the Fragment's onRequestPermissionsResult() method:
public class MainActivity extends AppCompatActivity {
MapFragment mapFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mapFragment = new MapFragment();
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.add(R.id.mapframe, mapFragment);
transaction.commit();
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
if (requestCode == MapFragment.MY_PERMISSIONS_REQUEST_LOCATION){
mapFragment.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
else {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
}
The layout just contains a FrameLayout where the MapFragment goes.
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.danielnugent.mapapplication.MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:id="@+id/mapframe"
android:layout_marginTop="?attr/actionBarSize"
android:layout_height="match_parent"
android:layout_width="match_parent" />
</android.support.design.widget.CoordinatorLayout>
Result
First prompt for the Location permission:
Once the Location permission is granted, show the current location with a Marker:
If the user ever denies or revokes the Location permission, this will be shown on app launch:
First, the explanation:
Then, the Location permission request:
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