private GoogleMap mMap;
private GoogleApiClient googleApiClient;
private LocationRequest locationRequest;
private Location lastLocation;
private Marker currentUserLocationMarker;
private static final int Request_User_Location_Code=99;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_google_maps);
    if(Build.VERSION.SDK_INT>= Build.VERSION_CODES.M){
    checkUserLocationPermmision();
    }
    // Obtain the SupportMapFragment and get notified when the map is ready to be used.
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);
}


@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;
    if(ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)==PackageManager.PERMISSION_GRANTED){

        buildGoogleApiClient();
        mMap.setMyLocationEnabled(true);
    }

}
public Boolean checkUserLocationPermmision(){
    if(ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)!= PackageManager.PERMISSION_GRANTED  ){
        if(ActivityCompat.shouldShowRequestPermissionRationale(this,Manifest.permission.ACCESS_FINE_LOCATION)){
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, Request_User_Location_Code );
        }
        else{
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, Request_User_Location_Code );
        }
        return false;
    }
    else{
        return true;
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    switch(requestCode){
        case Request_User_Location_Code:
        if(grantResults.length>0 && grantResults[0]== PackageManager.PERMISSION_GRANTED){
            if(ContextCompat.checkSelfPermission
                    (this, Manifest.permission.ACCESS_FINE_LOCATION)==PackageManager.PERMISSION_GRANTED){
                    if( googleApiClient== null){
                        buildGoogleApiClient();
                    }
                    mMap.setMyLocationEnabled(true);
            }
            else{
                Toast.makeText(this, "pemission denied ", Toast.LENGTH_SHORT).show();
            }
            return;
        }
    }
}

protected synchronized void buildGoogleApiClient(){
googleApiClient= new GoogleApiClient.Builder(this)
        .addConnectionCallbacks(this)
        .addOnConnectionFailedListener(this)
        .addApi(LocationServices.API)
        .build();
googleApiClient.connect();
}

@Override
public void onLocationChanged(Location location) {
this.lastLocation= location;
if(currentUserLocationMarker!= null){
    currentUserLocationMarker.remove();
}
LatLng latLng= new LatLng(location.getLatitude(),location.getLongitude());
MarkerOptions markerOptions= new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("user current Location");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
currentUserLocationMarker= mMap.addMarker(markerOptions);
mMap.moveCamera(CameraUpdateFactory.zoomBy(14));

if(googleApiClient!= null){
    LocationServices.FusedLocationApi.removeLocationUpdates(googleApiClient,this);
}

}

    public void onClick(View v){
    switch(v.getId()){
        case R.id.search_address:
            EditText addressField=(EditText)findViewById(R.id.location_search);
            String address= addressField.getText().toString();
            List<Address> addressList=null;
            MarkerOptions userMarkerOptions=new MarkerOptions();
            if(!TextUtils.isEmpty(address)){
                Geocoder geocoder= new Geocoder(this);
                try {
                    addressList=geocoder.getFromLocationName(address,6);
                    if(addressList!= null) {
                        for (int i = 0; i < addressList.size(); i++) {
                            Address userAddress = addressList.get(i);
                            LatLng latLng = new LatLng(userAddress.getLatitude(), userAddress.getLongitude());

                            userMarkerOptions.position(latLng);
                            userMarkerOptions.title(address);
                            userMarkerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE));
                            mMap.addMarker(userMarkerOptions);
                            mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
                            mMap.animateCamera(CameraUpdateFactory.zoomTo(10));


                        }


                    }
                    else{
                        Toast.makeText(this,"Location not found...",Toast.LENGTH_SHORT).show();

                    }
                }
                catch (IOException e) {
                    e.printStackTrace();
                }

            }
            else{
                Toast.makeText(this,"please write any location name",Toast.LENGTH_SHORT).show();
            }
            break;

    }
    }

@Override
public void onConnected(@Nullable Bundle bundle) {
    locationRequest= new LocationRequest();
    locationRequest.setInterval(1100);
    locationRequest.setFastestInterval(1100);
    locationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
  if(ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)==PackageManager.PERMISSION_GRANTED)
    LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient,locationRequest,this);

}

@Override
public void onConnectionSuspended(int i) {

}

@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {