Как решить NullPointerException при вызове NavigationView.onStart?
Я использую NavigationView фрагменты, чтобы добавить слушателя для onProgressChange(). Это приводит к тому, что приложение не перезагружается после второго запуска. Меня уведомили, что я должен включить методы жизненного цикла для NavigationView, но развертывание onStart цикл привел к сбою приложения с java.lang.NullPointerException: Attempt to invoke virtual method 'void com.mapbox.services.android.navigation.ui.v5.NavigationView.onStart()' on a null object reference, Я инициализирую NavigationView до этого onStart()поэтому я не могу определить проблему.
Вот мой код:
package com.creighton.adh81910.creighton_navigation;
import java.lang.*;
import android.arch.lifecycle.Lifecycle;
import android.arch.lifecycle.OnLifecycleEvent;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.app.AppCompatDelegate;
import android.view.SearchEvent;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.mapbox.api.directions.v5.models.LegStep;
import com.mapbox.api.directions.v5.models.RouteLeg;
import com.mapbox.mapboxsdk.camera.CameraPosition;
import com.mapbox.mapboxsdk.style.sources.VectorSource;
import com.mapbox.services.android.navigation.ui.v5.NavigationView;
import com.mapbox.services.android.navigation.ui.v5.NavigationViewOptions;
import com.mapbox.services.android.navigation.ui.v5.OnNavigationReadyCallback;
import com.mapbox.services.android.navigation.ui.v5.listeners.NavigationListener;
import com.mapbox.services.android.navigation.ui.v5.map.NavigationMapboxMap;
import com.mapbox.api.directions.v5.DirectionsCriteria;
import com.mapbox.api.directions.v5.MapboxDirections;
import com.mapbox.services.*;
import com.mapbox.android.core.*;
import com.mapbox.services.android.navigation.ui.v5.NavigationLauncherOptions.*;
import com.mapbox.android.core.location.LocationEngine;
import com.mapbox.android.core.location.LocationEngineListener;
import com.mapbox.android.core.location.LocationEnginePriority;
import com.mapbox.android.core.location.LocationEngineProvider;
import com.mapbox.android.core.permissions.PermissionsListener;
import com.mapbox.android.core.permissions.PermissionsManager;
import com.mapbox.geojson.Point;
import com.mapbox.mapboxsdk.Mapbox;
import com.mapbox.mapboxsdk.annotations.Marker;
import com.mapbox.mapboxsdk.annotations.MarkerOptions;
import com.mapbox.mapboxsdk.camera.CameraUpdateFactory;
import com.mapbox.mapboxsdk.geometry.LatLng;
import com.mapbox.mapboxsdk.plugins.locationlayer.LocationLayerPlugin;
import com.mapbox.mapboxsdk.maps.MapView;
import com.mapbox.mapboxsdk.maps.MapboxMap;
import com.mapbox.mapboxsdk.maps.OnMapReadyCallback;
import com.mapbox.mapboxsdk.plugins.locationlayer.modes.CameraMode;
import com.mapbox.mapboxsdk.plugins.locationlayer.modes.RenderMode;
import com.mapbox.services.android.navigation.ui.v5.NavigationLauncher;
import com.mapbox.services.android.navigation.ui.v5.NavigationLauncherOptions;
import com.mapbox.services.android.navigation.ui.v5.route.NavigationMapRoute;
import com.mapbox.services.android.navigation.v5.navigation.MapboxNavigationOptions;
import com.mapbox.services.android.navigation.v5.navigation.NavigationEventListener;
import com.mapbox.services.android.navigation.v5.navigation.NavigationRoute;
import com.mapbox.api.directions.v5.models.DirectionsResponse;
import com.mapbox.api.directions.v5.models.DirectionsRoute;
import com.mapbox.services.android.navigation.v5.navigation.MapboxNavigation;
import com.mapbox.services.android.navigation.v5.offroute.OffRouteListener;
import com.mapbox.services.android.navigation.v5.routeprogress.ProgressChangeListener;
import com.mapbox.services.android.navigation.v5.routeprogress.RouteLegProgress;
import com.mapbox.services.android.navigation.v5.routeprogress.RouteProgress;
import com.mapbox.services.android.navigation.v5.utils.LocaleUtils;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import android.util.Log;
import java.security.acl.Permission;
import java.util.List;
import java.util.Map;
public class MainActivity extends AppCompatActivity implements OnMapReadyCallback, LocationEngineListener, PermissionsListener, MapboxMap.OnMapClickListener, ProgressChangeListener, OffRouteListener
,NavigationEventListener, OnNavigationReadyCallback, NavigationListener {
private MapView mapView;
private MapboxMap map;
private Button startButton;
private PermissionsManager permissionsManager;
private LocationEngine locationEngine;
private LocationLayerPlugin locationLayerPlugin;
private Location originLocation;
private Point originPosition;
private Point destinationPosition;
private Marker destinationMarker;
private NavigationMapRoute navigationMapRoute;
private static final String TAG = "MainActivity";
private DirectionsRoute currentRoute;
private MapboxDirections mapboxDirections;
private MapboxDirections.Builder directionsBuilder;
public int MarkCount;
private NavigationView navigationView;
public Marker destinationMarker1;
private MapboxNavigation navigation;
private String Direction;
// Used to load the 'native-lib' library on application startup.
static {
System.loadLibrary("native-lib");
}
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Mapbox.getInstance(this, "pk.eyJ1IjoiYWRoYXJtYXZhcmFwdSIsImEiOiJjampzdXBkMW4wY25jM3BtcnUzNGpwdTA4In0.qN9Y1LoHxPaONtXLp7rBCw");
setContentView(R.layout.activity_main);
LatLng target = new LatLng(41.265372, -95.946873);
mapView = (MapView) findViewById(R.id.mapView);
startButton = findViewById(R.id.startButton);
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(this);
startButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
setContentView(R.layout.activity_navigation);
navigationView = findViewById(R.id.navigationView);
//navigationView.onCreate(savedInstanceState);
navigationView.initialize(MainActivity.this);
//Intent intent = new Intent(this, UnityPlayerActivity.class);
//startActivity(intent);
}
});
mapView.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(final MapboxMap mapboxMap) {
mapboxMap.setCameraPosition(new CameraPosition.Builder()
.target(target)
.zoom(16.4)
.build());
VectorSource vectorSource = new VectorSource(
"trees-source",
// replace examples.8mj5l1r9 with the map ID for the tileset
// you created by uploading data to your Mapbox account
"http://api.mapbox.com/v4/adharmavarapu.cjk2mhpav01esuapptvy9gytn-8siy1?access_token=" + Mapbox.getAccessToken()
);
mapboxMap.addSource(vectorSource);;
}
});
}
@OnLifecycleEvent(Lifecycle.Event.ON_START)
public void onStart() {
super.onStart();
if (locationEngine != null) {
locationEngine.requestLocationUpdates();
mapView.onStart();
}
if (locationLayerPlugin != null) {
locationLayerPlugin.onStart();
mapView.onStart();
}
if (navigationView == null){
mapView.onStart();
}
}
@OnLifecycleEvent(Lifecycle.Event.ON_RESUME)
public void onResume() {
super.onResume();
mapView.onResume();
}
@OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
public void onPause() {
super.onPause();
mapView.onPause();
}
@OnLifecycleEvent(Lifecycle.Event.ON_STOP)
public void onStop() {
super.onStop();
if (locationEngine != null) {
locationEngine.removeLocationUpdates();
}
if (locationLayerPlugin != null) {
locationLayerPlugin.onStop();
}
mapView.onStop();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mapView.onLowMemory();
}
@OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
protected void onDestroy() {
super.onDestroy();
if (locationEngine != null) {
locationEngine.deactivate();
}
mapView.onDestroy();
}
@Override
public void onMapReady(MapboxMap mapboxMap) {
map = mapboxMap;
map.addOnMapClickListener(this);
enableLocation();
}
private void enableLocation() {
if (PermissionsManager.areLocationPermissionsGranted(this)) {
initializeLocationEngine();
initializeLocationLayer();
} else {
permissionsManager = new PermissionsManager(this);
permissionsManager.requestLocationPermissions(this);
}
}
private void initializeLocationEngine() {
locationEngine = new LocationEngineProvider(this).obtainBestLocationEngineAvailable();
//locationEngine.setPriority(LocationEnginePriority.HIGH_ACCURACY);
locationEngine.setInterval(0);
locationEngine.activate();
Location lastLocation = locationEngine.getLastLocation();
if(lastLocation != null) {
originLocation = lastLocation;
setCameraPosition(lastLocation);
}
else {
locationEngine.addLocationEngineListener(this);
}
}
private void initializeLocationLayer() {
locationLayerPlugin = new LocationLayerPlugin(mapView, map, locationEngine);
locationLayerPlugin.setLocationLayerEnabled(true);
locationLayerPlugin.setCameraMode(CameraMode.TRACKING);
locationLayerPlugin.setRenderMode(RenderMode.NORMAL);
}
private void setCameraPosition(Location location) {
map.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(41.265372, -95.946873), 17));
}
@Override
public void onMapClick(@NonNull LatLng point) {
destinationMarker = map.addMarker(new MarkerOptions().position(point));
destinationPosition = Point.fromLngLat(point.getLongitude(), point.getLatitude());
originPosition = Point.fromLngLat(originLocation.getLongitude(), originLocation.getLatitude());
getRoute(originPosition, destinationPosition);
MarkCount = MarkCount + 1;
if(MarkCount > 1){
map.clear();
MarkCount = 1;
destinationMarker = map.addMarker(new MarkerOptions().position(point));
}
startButton.setEnabled(true);
startButton.setBackgroundResource(R.color.colorPrimary);
startButton.setTextColor(getApplication().getResources().getColor(R.color.md_grey_200));
}
private void getRoute(Point origin, Point destination) {
NavigationRoute.builder(getApplicationContext())
.accessToken(Mapbox.getAccessToken())
.origin(origin)
.destination(destination)
.profile(DirectionsCriteria.PROFILE_WALKING)
.build()
.getRoute(new Callback<DirectionsResponse>() {
@Override
public void onResponse(Call<DirectionsResponse> call, Response<DirectionsResponse> response) {
if (response.body() == null) {
Log.e(TAG, "No routes found, check right user and access token");
return;
} else if (response.body().routes().size() == 0) {
Log.e(TAG, "No routes found");
return;
}
currentRoute = response.body().routes().get(0);
if (navigationMapRoute != null) {
navigationMapRoute.removeRoute();
} else {
navigationMapRoute = new NavigationMapRoute(null, mapView, map);
}
navigationMapRoute.addRoute(currentRoute);
}
@Override
public void onFailure(Call<DirectionsResponse> call, Throwable t) {
Log.e(TAG, "Error" + t.getMessage());
}
});
}
@Override
@SuppressWarnings("MissingPermission")
public void onConnected() {
locationEngine.requestLocationUpdates();
}
@Override
public void onLocationChanged(Location location) {
if (location != null) {
originLocation = location;
setCameraPosition(location);
}
}
@Override
public void onExplanationNeeded(List<String> permissionsToExplain) {
//Present Dialog
}
@Override
public void onPermissionResult(boolean granted) {
if (granted) {
enableLocation();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
permissionsManager.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mapView.onSaveInstanceState(outState);
}
@Override
public void onProgressChange(Location location, RouteProgress routeProgress) {
String currentStep = routeProgress.currentLegProgress().currentStep().maneuver().instruction();
System.out.println(currentStep);
if(currentStep.toLowerCase().contains("right")){
Direction = "right";
}
else if(currentStep.toLowerCase().contains("left")){
Direction = "left";
}
else{
Direction = "straight";
}
System.out.println(Direction);
}
/**
* A native method that is implemented by the 'native-lib' native library,
* which is packaged with this application.
*/
//public native String stringFromJNI();
@Override
public void onRunning(boolean running) {
running = true;
}
@Override
public void userOffRoute(Location location) {
}
@Override
public void onCancelNavigation() {
finish();
}
@Override
public void onNavigationFinished() {
finish();
}
@Override
public void onNavigationRunning() {
}
@Override
public void onNavigationReady(boolean isRunning) {
Point origin = originPosition;
Point destination = destinationPosition;
String awsPoolId = null;
boolean simulateRoute = true;
MapboxNavigationOptions navigationOptions= MapboxNavigationOptions.builder()
.build();
NavigationViewOptions navigationViewOptions = NavigationViewOptions.builder()
.directionsRoute(currentRoute)
.shouldSimulateRoute(true)
.navigationOptions(navigationOptions)
.directionsProfile(DirectionsCriteria.PROFILE_WALKING)
.navigationListener(MainActivity.this)
.progressChangeListener(MainActivity.this)
.build();
navigationView.startNavigation(navigationViewOptions);
isRunning = true;
}
}
Main_Layout:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:mapbox="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.mapbox.mapboxsdk.maps.MapView
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent"
mapbox:mapbox_cameraTargetLat="41.265880"
mapbox:mapbox_cameraTargetLng="-95.947615"
mapbox:mapbox_styleUrl="mapbox://styles/adharmavarapu/cjjsuq6l91bfm2spg4nfa85tp"
mapbox:mapbox_cameraZoom="16.8" >
</com.mapbox.mapboxsdk.maps.MapView>
<Button
android:id="@+id/startButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="24dp"
android:layout_marginEnd="24dp"
android:layout_marginLeft="24dp"
android:layout_marginRight="24dp"
android:layout_marginStart="24dp"
android:text="Start Navigating"
mapbox:layout_constraintBottom_toBottomOf="parent"
mapbox:layout_constraintEnd_toEndOf="parent"
mapbox:layout_constraintStart_toStartOf="parent" />
</android.support.constraint.ConstraintLayout>
Activity_Navigation
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<com.mapbox.services.android.navigation.ui.v5.NavigationView
android:id="@+id/navigationView"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:navigationLightTheme="@style/NavigationViewLight"
app:navigationDarkTheme="@style/NavigationViewDark"
></com.mapbox.services.android.navigation.ui.v5.NavigationView>
</android.support.constraint.ConstraintLayout>