Android 谷歌地图在方向改变和事件处理中的应用

在这项活动中我有三个疑问

当用户在不打开GPS的情况下打开应用程序时，他们将看到默认位置

因此，如果我们可以在用户进入应用程序之前提醒他们使用GPS服务，或者如果他们在进入应用程序之后使用GPS服务，则位置会在地图上得到更新

当我试图保存位置和相机位置时，方向更改标记不可见

在onmapredy中获取用户的位置，但是如果用户移动，如何更新

public class HomeActivity extends AppCompatActivity 
       implements OnMapReadyCallback, 
        GoogleApiClient.OnConnectionFailedListener,
        GoogleApiClient.ConnectionCallbacks,
        LocationListener{

@BindView(id.toolbar)
Toolbar toolbar;
@BindView(id.recycler_list)
RecyclerView recyclerList;

private GoogleMap mMap;
private MarkerOptions marker;
private boolean mLocationPermissionGranted;
private int PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION = 1;
private Location mLastKnownLocation;
private CameraPosition mCameraPosition;
private float DEFAULT_ZOOM = 15;
private static final String KEY_CAMERA_POSITION = "camera_position";
private static final String KEY_LOCATION = "location";

private FirebaseAuth mFirebaseAuth;
private FirebaseUser mFirebaseUser;
private FirebaseAuth.AuthStateListener mAuthListener;
private  GoogleApiClient googleApiClient;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.setContentView(layout.activity_home);
    ButterKnife.bind(this);

    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayShowHomeEnabled(true);

    mFirebaseAuth = FirebaseAuth.getInstance();
    mFirebaseUser = mFirebaseAuth.getCurrentUser();

    mAuthListener = new FirebaseAuth.AuthStateListener() {
        @Override
        public void onAuthStateChanged(FirebaseAuth firebaseAuth) {
            if (mFirebaseUser == null) {
                startActivity(new Intent(getApplicationContext(), SignActivity.class));
                finish();
                return;
            }
        }
    };

    // Configure Google Sign In
    GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN).requestIdToken(getString(R.string.default_web_client_id))
            .requestEmail()
            .build();
    googleApiClient = new GoogleApiClient.Builder(this)
            .enableAutoManage(this ,this)
            .addApi(Auth.GOOGLE_SIGN_IN_API , gso)
            .addConnectionCallbacks(this)
            .addApi(LocationServices.API)
            .addOnConnectionFailedListener(this)
            .build();

    if (savedInstanceState != null) {
        mLastKnownLocation = savedInstanceState.getParcelable(KEY_LOCATION);
        mCameraPosition = savedInstanceState.getParcelable(KEY_CAMERA_POSITION);
    }
}

@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;

    updateLocationUI();
    getDeviceLocation();
}

private void updateLocationUI() {
    if (mMap == null) {
        return;
    }

    if (ContextCompat.checkSelfPermission(this.getApplicationContext(),
            android.Manifest.permission.ACCESS_FINE_LOCATION)
            == PackageManager.PERMISSION_GRANTED) {
        mLocationPermissionGranted = true;
    } else {
        ActivityCompat.requestPermissions(this,
                new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
                PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);
    }

    if (mLocationPermissionGranted) {
        mMap.setMyLocationEnabled(true);
        mMap.getUiSettings().setMyLocationButtonEnabled(true);
    } else {
        mMap.setMyLocationEnabled(false);
        mMap.getUiSettings().setMyLocationButtonEnabled(false);
        mLastKnownLocation = null;
    }
}

private void getDeviceLocation() {

    if (mLocationPermissionGranted) {
        mLastKnownLocation = LocationServices.FusedLocationApi
                .getLastLocation(googleApiClient);
    }

    if (mCameraPosition != null) {
        mMap.moveCamera(CameraUpdateFactory.newCameraPosition(mCameraPosition));
    } else if (mLastKnownLocation != null) {
        LatLng location = new LatLng(mLastKnownLocation.getLatitude(),
                mLastKnownLocation.getLongitude());
        mMap.addMarker(new MarkerOptions().icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ROSE))
                .position(location)).setTitle(mFirebaseUser.getDisplayName());
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(location,DEFAULT_ZOOM));

    } else {
        LatLng mDefaultLocation = new LatLng(-31,40);
        mMap.addMarker(new MarkerOptions().position(mDefaultLocation)).setTitle("Unknown");
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(mDefaultLocation, DEFAULT_ZOOM));
        mMap.getUiSettings().setMyLocationButtonEnabled(false);
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main_menu, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();

    if (id == R.id.action_profile) {
        Intent intent = new Intent(HomeActivity.this, ProfileActivity.class);
        intent.putExtra("name", mFirebaseUser.getDisplayName());
        intent.putExtra("email", mFirebaseUser.getEmail());
        intent.putExtra("photoUrl",mFirebaseUser.getPhotoUrl().toString());
        startActivity(intent);
    }else if (id == R.id.action_event) {
        Intent intent = new Intent(HomeActivity.this, CreateEventActivity.class);
        startActivity(intent);
    }else if (id == R.id.action_logout) {
        mFirebaseAuth.getInstance().signOut();
        startActivity(new Intent(HomeActivity.this, SignActivity.class));
        finish();
    }
    return super.onOptionsItemSelected(item);
}

@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
    Toast.makeText(this, "Connection Failed" , Toast.LENGTH_LONG).show();
}
@Override
public void onStart() {
    super.onStart();
    mFirebaseAuth.addAuthStateListener(mAuthListener);
    googleApiClient.connect();
}
@Override
public void onStop() {
    googleApiClient.disconnect();
    if (mAuthListener != null) {
        mFirebaseAuth.removeAuthStateListener(mAuthListener);
    }
    super.onStop();
}

@Override
public void onConnected(@Nullable Bundle bundle) {
    SupportMapFragment mapFragment = (SupportMapFragment) this.getSupportFragmentManager()
            .findFragmentById(id.map);
    mapFragment.getMapAsync(this);
}

@Override
public void onConnectionSuspended(int i) {

}

@Override
public void onLocationChanged(Location location) {
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {

}

@Override
public void onProviderEnabled(String provider) {

}

@Override
public void onProviderDisabled(String provider) {

}

@Override
protected void onSaveInstanceState(Bundle outState) {
    if (mMap != null) {
        outState.putParcelable(KEY_CAMERA_POSITION, mMap.getCameraPosition());
        outState.putParcelable(KEY_LOCATION, mLastKnownLocation);
        super.onSaveInstanceState(outState);
    }
}

}

---

1.对于方向更改问题，您必须在AndroidManifest.xml中进行如下更改：

<activity
            android:name=".activity.VerificationActivity"
            android:configChanges="orientation|screenSize"/>

AlertDialogManager.java：

public class AlertDialogManager {
    public static void showInternetEnableAlertToUser(final Context context) {
        AlertDialog.Builder altForInternet = new AlertDialog.Builder(context);

        // User can't cancel dialog
        altForInternet.setCancelable(false);

        // Setting Dialog Title
        altForInternet.setTitle("Internet Enable Or Not ?");

        // Setting Dialog Message
        altForInternet.setMessage("Internet Is Not Enable. \nDo You Want To Enable ?");

        // On pressing Settings button
        altForInternet.setPositiveButton("YES", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(
                        Settings.ACTION_WIFI_SETTINGS);
                context.startActivity(intent);
            }

        });

        // Showing Alert Message
        altForInternet.show();

    }

    public static void showInternetEnableAlertToUser1(final Context context) {
        AlertDialog.Builder altForInternet = new AlertDialog.Builder(context);

        altForInternet.setCancelable(false);
        // Setting Dialog Title
        altForInternet.setTitle("PLease Connect With Internet ");

        // Setting Dialog Message
        altForInternet.setMessage("Internet Connection Is Not Available. \nPlease Connect With Net And Restart Application");

        // On pressing Settings button
        altForInternet.setPositiveButton("Ok", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                System.exit(0);
            }

        });

        // Showing Alert Message
        altForInternet.show();

    }

    public static void showGPSDisabledAlertToUser(final Context context) {
        // TODO Auto-generated method stub
        AlertDialog.Builder altForGPS = new AlertDialog.Builder(context);

        altForGPS.setTitle("GPS Enable Or Not ?");

        // Setting Dialog Message
        altForGPS.setMessage("GPS Is Not Enable. \nDo You Want To Enable ?");
        altForGPS.setPositiveButton("Yes",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        Intent callGPSSettingIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                        context.startActivity(callGPSSettingIntent);
                    }
                });
        altForGPS.setNegativeButton("Cancel",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        dialog.cancel();
                    }
                });
        AlertDialog alert = altForGPS.create();
        alert.show();
    }
}

---

我希望这可能会帮助您..

关注此链接：->对于我们来说，关注此链接：->/在帖子中，这就像工作已经完成一样，但由于我正在使用GoogleapClient并遵循此链接，如果您可以帮助完成上述代码。

public class AlertDialogManager {
    public static void showInternetEnableAlertToUser(final Context context) {
        AlertDialog.Builder altForInternet = new AlertDialog.Builder(context);

        // User can't cancel dialog
        altForInternet.setCancelable(false);

        // Setting Dialog Title
        altForInternet.setTitle("Internet Enable Or Not ?");

        // Setting Dialog Message
        altForInternet.setMessage("Internet Is Not Enable. \nDo You Want To Enable ?");

        // On pressing Settings button
        altForInternet.setPositiveButton("YES", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(
                        Settings.ACTION_WIFI_SETTINGS);
                context.startActivity(intent);
            }

        });

        // Showing Alert Message
        altForInternet.show();

    }

    public static void showInternetEnableAlertToUser1(final Context context) {
        AlertDialog.Builder altForInternet = new AlertDialog.Builder(context);

        altForInternet.setCancelable(false);
        // Setting Dialog Title
        altForInternet.setTitle("PLease Connect With Internet ");

        // Setting Dialog Message
        altForInternet.setMessage("Internet Connection Is Not Available. \nPlease Connect With Net And Restart Application");

        // On pressing Settings button
        altForInternet.setPositiveButton("Ok", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                System.exit(0);
            }

        });

        // Showing Alert Message
        altForInternet.show();

    }

    public static void showGPSDisabledAlertToUser(final Context context) {
        // TODO Auto-generated method stub
        AlertDialog.Builder altForGPS = new AlertDialog.Builder(context);

        altForGPS.setTitle("GPS Enable Or Not ?");

        // Setting Dialog Message
        altForGPS.setMessage("GPS Is Not Enable. \nDo You Want To Enable ?");
        altForGPS.setPositiveButton("Yes",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        Intent callGPSSettingIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                        context.startActivity(callGPSSettingIntent);
                    }
                });
        altForGPS.setNegativeButton("Cancel",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        dialog.cancel();
                    }
                });
        AlertDialog alert = altForGPS.create();
        alert.show();
    }
}