在 Fused Location 的帮助下请求位置更新时应用程序崩溃

Posted 2023-04-14

【中文标题】在 Fused Location 的帮助下请求位置更新时应用程序崩溃

【英文标题】：App Crashes While Requesting Location Updates With The Help Of Fused Location

【发布时间】：2018-10-03 20:44:19

【问题描述】：

我在

的帮助下请求位置更新

LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, 
locationRequest, locationListener);

但是当我试图在 swtich onClickListener 上提及这一点时，它崩溃了。然而，android Studio 本身并没有抛出错误。

作为此功能的一部分，我已经添加了请求融合位置、粗略位置和 Internet 的权限。我什至在请求更新之前尝试连接 google Api 客户端 喜欢。，

if(googleApiClient.isConnected)
LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, 
locationRequest, locationListener);
else
buildGoogleApiClient();

但我无法解决错误。 使用 Fused Location Provider Api 移除位置请求也会导致应用崩溃。

我的清单文件有如下代码。如您所见，我已经请求了所需的权限

我的 XML 文件是

<RelativeLayout
    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_
    android:layout_
    >


    <fragment
        android:id="@+id/map"
        android:name="com.google.android.gms.maps.SupportMapFragment"
        android:layout_
        android:layout_
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        tools:context="com.matt.dumate.Welcome" />

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar3"
        android:layout_
        android:layout_
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:background="#0064a2"
        android:weightSum="2">

        <RelativeLayout
            android:layout_
            android:layout_
            android:layout_weight="1"
            android:gravity="start">

            <com.github.glomadrian.materialanimatedswitch.MaterialAnimatedSwitch
                android:id="@+id/locationSwitch"
                android:layout_
                android:layout_
                android:layout_alignParentStart="true"
                android:layout_centerInParent="true"
                android:layout_marginStart="0dp"
                android:layout_marginTop="0dp"
                app:ball_press_color="@android:color/white"
                app:ball_release_color="@color/ballReleaseColor"
                app:base_press_color="@color/basePressColor"
                app:base_release_color="@color/baseReleaseColor"
                app:icon_press="@drawable/ic_location_on"
                app:icon_release="@drawable/ic_location_off" />

        </RelativeLayout>

    </android.support.v7.widget.Toolbar>

    <Button
        android:id="@+id/bookingButton"
        android:layout_
        android:layout_
        android:layout_alignBottom="@+id/toolbar3"
        android:layout_alignParentStart="true"
        android:layout_marginBottom="5dp"
        android:layout_marginStart="90dp"
        android:layout_marginTop="5dp"
        android:background="@drawable/bookingbutton"
        android:gravity="center"
        android:text="@string/booking"
        android:textColor="@android:color/white" />


</RelativeLayout>

这是我的 java 文件。我也在学习创建一个像 Uber 这样的应用程序。

package com.matt.dumate;

import com.firebase.geofire.GeoFire;
import com.firebase.geofire.GeoLocation;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.location.FusedLocationProviderApi;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationManager;
import android.os.Build;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.Snackbar;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.support.v4.content.ContextCompat;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.github.glomadrian.materialanimatedswitch.MaterialAnimatedSwitch;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

public class Welcome extends FragmentActivity implements OnMapReadyCallback,
    GoogleApiClient.ConnectionCallbacks,
    GoogleApiClient.OnConnectionFailedListener,
    LocationListener 

MaterialAnimatedSwitch location_switch;
SupportMapFragment mapFragment;

private Button btnBooking;
private Location lastLocation;
private GoogleApiClient.OnConnectionFailedListener onConnectionFailedListener;
private LocationRequest locationRequest;
private LocationListener locationListener;
private LocationManager locationManager;
private Marker marker;
private GoogleMap mMap;
private GoogleApiClient googleApiClient;
private final int RequestCode = 10;
private final int ResourceCode = 11;

private DatabaseReference databaseReference;
GeoFire geoFire;


@Override
protected void onCreate(Bundle savedInstanceState) 

    checkLocationPermission();
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_welcome);
    mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);
    locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);

    /***/
    databaseReference = FirebaseDatabase.getInstance().getReference("Drivers");
    geoFire = new GeoFire(databaseReference);
    setupLocation();


@Override
public void onMapReady(GoogleMap googleMap) 
    setupUiViews();
    mMap = googleMap;
    location_switch.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View v) 
            if(location_switch.isChecked())
                displayLocation();
                Snackbar.make(mapFragment.getView(), "You Are Online", Snackbar.LENGTH_SHORT).show();
            else 
                stopLocationUpdates();
                Snackbar.make(mapFragment.getView(), "You Are Offline", Snackbar.LENGTH_SHORT).show();
                if (marker != null) 
                    marker.remove();
                
            
        
    );



@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) 
    switch (requestCode) 
        case RequestCode:
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) 
                if (checkPlayServices())
                    buildGoogleApiClient();
                    createLocationRequest();
                    if (location_switch.isChecked())
                        displayLocation();
                    
                
            

    


public void checkLocationPermission() 
    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, RequestCode);
         else 
            ActivityCompat.requestPermissions(this, new String[]Manifest.permission.ACCESS_FINE_LOCATION, RequestCode);
        
     else 
        Toast.makeText(this, "Location Permissions Granted", Toast.LENGTH_SHORT).show();
    


@Override
public void onConnected(@Nullable Bundle bundle) 
    locationRequest = LocationRequest.create()
            .setInterval(1000)
            .setFastestInterval(500)
            .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

    startLocationUpdates();
    displayLocation();


@Override
public void onConnectionSuspended(int i) 
    googleApiClient.connect();


@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) 


@Override
public void onLocationChanged(Location location) 
    lastLocation = location;
    displayLocation();



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


private void setupUiViews() 
    btnBooking = findViewById(R.id.bookingButton);
    location_switch = findViewById(R.id.locationSwitch);


private void displayLocation() 
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) 
        return;
    
    lastLocation = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
    if (lastLocation != null )
        if(location_switch.isChecked())
            final Double lat = lastLocation.getLatitude();
            final Double lng = lastLocation.getLongitude();

            geoFire.setLocation(FirebaseAuth.getInstance().getCurrentUser().getUid(), new GeoLocation(lat, lng), new GeoFire.CompletionListener() 
                @Override
                public void onComplete(String key, DatabaseError error) 
                    if (marker != null) 
                        marker.remove();
                        marker = mMap.addMarker(new MarkerOptions().position(new LatLng(lat, lng)).icon(BitmapDescriptorFactory.fromResource(R.drawable.carmarker)).title("You"));

                        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(lat, lng), 15.0f));
                    else
                        marker = mMap.addMarker(new MarkerOptions().position(new LatLng(lat, lng)).icon(BitmapDescriptorFactory.fromResource(R.drawable.carmarker)).title("You"));

                        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(lat, lng), 15.0f));
                
                
            );
        else
            Toast.makeText(this, "Cannot Get Location Updates", Toast.LENGTH_SHORT).show();
        
    else
        Log.d("Error", "Cannot Get Your Location");
    


private void setupLocation() 
    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, RequestCode);
         else 
            ActivityCompat.requestPermissions(this, new String[]Manifest.permission.ACCESS_FINE_LOCATION, RequestCode);
        
    else
        if (checkPlayServices())
            buildGoogleApiClient();
            createLocationRequest();

        
    


private void createLocationRequest() 
    locationRequest = LocationRequest.create()
            .setInterval(1500)
            .setFastestInterval(500)
            .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
            .setSmallestDisplacement(0);


private boolean checkPlayServices()
    int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
    if (resultCode != ConnectionResult.SUCCESS)
        if (GooglePlayServicesUtil.isUserRecoverableError(resultCode))
            GooglePlayServicesUtil.getErrorDialog(resultCode, this, ResourceCode).show();
        else 
            Toast.makeText(this, "This Device Is Not Supported", Toast.LENGTH_SHORT).show();
            finish();
        return false;
    
    return true;


private void stopLocationUpdates() 
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) 
        return;
    
    //LocationServices.FusedLocationApi.removeLocationUpdates(googleApiClient, locationListener);


private void startLocationUpdates() 
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) 
        return;
    
    //LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, locationListener);


 

【问题讨论】：

However there was no error thrown Android Studio itself 如果发生崩溃，有堆栈跟踪，请发布

实际上唯一的问题是在最后一个参数上我放了 locationListener 我只需要把它改成这个。 LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, locationListener);还是谢谢。

【参考方案1】：

您在locationListener 的帮助下请求了位置更新，但您尚未初始化。您可以通过初始化位置侦听器或在代码的给定语句中将locationListener 更改为this 来解决此问题。

LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, locationListener);

到：

LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, this);

【参考方案2】：

融合定位服务的实现已经改变，你可以在没有GoogleApiClient的情况下做到这一点。你可以这样试试，

将所需的位置库添加到build.grade

implementation 'com.google.android.gms:play-services-location:15.0.0'

为清单添加所需的权限

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

在Welcome活动内

public class Welcome extends AppCompatActivity implements OnMapReadyCallback 

    ...
    ...

    private FusedLocationProviderClient mFusedLocationClient;

    private LocationRequest mLocationRequest = LocationRequest.create()
            .setInterval(1000)
            .setFastestInterval(500)
            .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

    private LocationCallback mLocationCallback = new LocationCallback() 
        @Override
        public void onLocationResult(LocationResult result) 
            super.onLocationResult(result);
            for (Location location : result.getLocations())
                if (location != null) 
                    displayLocation(result.getLastLocation());
                    break;
                
        
    ;

    ...
    ...

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_welcome);

        ...
        ...

        // Get fussed location instance
        mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);

        ...
        ...
    

    @Override
    public void onMapReady(GoogleMap googleMap) 

        ...
        ...

        // Check if location permission is granted
        if (!hasLocationPermission()) 
            // Request location permission
         else 
            // Get the last known location
            startLocationUpdate();
        
    

    private void startLocationUpdate() 
        try 
            mFusedLocationClient.getLastLocation().addOnSuccessListener(new OnSuccessListener<Location>() 
                @Override
                public void onSuccess(Location location) 
                    if (location != null) 
                        displayLocation(location);
                     else 
                    mFusedLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, null);
                    
                
            );
         catch (SecurityException ex) 
            ex.printStackTrace();
        
    

    private boolean hasLocationPermission() 
        return ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
            != PackageManager.PERMISSION_GRANTED
            && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION)
            != PackageManager.PERMISSION_GRANTED;
    

    private void stopLocationUpdate() 
        mFusedLocationClient.removeLocationUpdates(mLocationCallback);
    

    private void displayLocation(Location location) 
        // do something
        ...
        ...
    

【讨论】：

实际上唯一的问题是在最后一个参数上我放了 locationListener 我只需要把它改成这个。 LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, locationListener);不管怎么说，还是要谢谢你。这也奏效了。