我的要求：
我在一个类中使用了Bottom Navigation，成功登录后从Maninclass调用了此意图。在BottomNavigation中，我有四个选项，其中一个用于显示用户的CurrentLocation。我使用过片段。我几乎尝试了搜索中可用的所有选项，但未能成功。请帮助我。
Fragemnet类：
public class HomeFragment extends SupportMapFragment
implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener {
GoogleMap mGoogleMap;
SupportMapFragment mapFrag;
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
Marker mCurrLocationMarker;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Log.i("came to home" ,"create");
View view = inflater.inflate(R.layout.fragment_home, container, false);
return view;
}
@Override
public void onViewCreated(View view , Bundle savedInstanceState) {
Log.i("came to home" ,"created");
onResume();
super.onViewCreated(view, savedInstanceState);
}
@SuppressLint("ValidFragment")
public void onResume() {
Log.i("came to home" ,"resime");
onMapReady(mGoogleMap);
}
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//stop location updates when Activity is no longer active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);
}
}
public 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
}
}
}
BottomNavigation Class:
package com.americanexpress.developer.rideblue;
import android.media.Image;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.MenuItem;
import android.widget.TextView;
import com.americanexpress.developer.rideblue.fragments.BottomNVFragment;
import com.americanexpress.developer.rideblue.fragments.HomeFragment;
import com.americanexpress.developer.rideblue.fragments.*;
import com.google.android.gms.auth.api.signin.GoogleSignIn;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.common.Scopes;
import com.google.android.gms.common.api.Scope;
public class BottomNavigation extends AppCompatActivity implements BottomNavigationView.OnNavigationItemSelectedListener {
private TextView mTextMessage;
private FragmentManager fragmentManager;
Fragment fragment = null;
GoogleSignInOptions gso;
GoogleSignInAccount account;
HomeFragment mapFragment;
Bundle data ;
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.i("in bottom","inten2");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bottom_navigation);
mapFragment = new HomeFragment();
gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestScopes(new Scope(Scopes.DRIVE_APPFOLDER))
.requestEmail()
.build();
account = GoogleSignIn.getLastSignedInAccount(this);
data = new Bundle();
//loading the default fragment
//loadFragment(new HomeFragment());
BottomNavigationView bnv = (BottomNavigationView) findViewById(R.id.navigation);
bnv.setOnNavigationItemSelectedListener(this);
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_home:
methodForHomeFragment();
break;
case R.id.navigation_account:
methodForAccountFragment();
break;
case R.id.navigation_trips:
methodForTripsFragment();
break;
case R.id.navigation_notifications:
methodForNotificationFragment();
break;
}
return loadFragment(fragment);
}
private boolean loadFragment(Fragment fragment) {
//switching fragment
/* if (fragment != null && (!fragment.equals(new HomeFragment()))) {
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.fragment_container, fragment)
.commit();
return true;
}else {
Log.i("comming to methd", "home");
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.mapframe, fragment)
.commit();
return true;
}*/
if (fragment != null) {
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.fragment_container, fragment)
.commit();
return true;
}
return false;
}
public void methodForAccountFragment() {
fragment = new AccountFragment();
String userName = String.valueOf(account.getDisplayName());
data.putString("username", userName);
fragment.setArguments(data);
String userGmail = String.valueOf(account.getEmail());
data.putString("usergmail", userGmail);
fragment.setArguments(data);
String imageURL = String.valueOf(account.getPhotoUrl());
data.putString("imageurl", imageURL);
fragment.setArguments(data);
String tokenID = String.valueOf(account.getIdToken());
data.putString("tokenID", tokenID);
fragment.setArguments(data);
}
public void methodForTripsFragment() {
fragment = new TripsFragment();
// String token = String.valueOf(account.getIdToken());
// method to get trip details
}
public void methodForNotificationFragment() {
fragment = new NotificationsFragment();
// String token = String.valueOf(account.getIdToken());
// method to show notifications like thanks messages to the user
}
public void methodForHomeFragment() {
fragment = new HomeFragment();
// String token = String.valueOf(account.getIdToken());
// method to show notifications like thanks messages to the user
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
if (requestCode == HomeFragment.MY_PERMISSIONS_REQUEST_LOCATION){
mapFragment.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
else {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
}
答案 0 :(得分：0)
您不应该在onResume中自己调用onMapReady ..等到地图准备好..之后，您会发现onMapReady被称为回调..
public void onResume() {
Log.i("came to home" ,"resime");
onMapReady(mGoogleMap);
}