MapsActivity 无法转换为 com.google.android.gms.location.LocationListener

Posted 2023-04-14

【中文标题】MapsActivity 无法转换为 com.google.android.gms.location.LocationListener

【英文标题】：MapsActivity cannot be cast to com.google.android.gms.location.LocationListener

【发布时间】：2018-08-15 12:24:55

【问题描述】：

我正在尝试使用使用用户位置的 android studio 3.0.1 构建与谷歌地图相关的 android 应用程序。我在我的应用程序中遇到异常，该异常与 android 中的 com.google.android.gms.location.LocationListner 有关。我尝试寻找答案，但无法弄清楚问题所在。我尝试了这段代码，但它在 Android 上不起作用。

  package com.example.mrunal.firebase;

 import android.Manifest;
 import android.app.AlertDialog;
 import android.content.DialogInterface;
 import android.content.pm.PackageManager;
 import android.location.Location;
 import android.location.LocationListener;
 import android.os.Build;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.v4.app.ActivityCompat;
 import android.support.v4.app.FragmentActivity;
 import android.support.v4.content.ContextCompat;
 import android.widget.Toast;

 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.location.LocationServices;
 import com.google.android.gms.maps.CameraUpdateFactory;
 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.BitmapDescriptorFactory;
 import com.google.android.gms.maps.model.LatLng;
 import com.google.android.gms.maps.model.Marker;
 import com.google.android.gms.maps.model.MarkerOptions;

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

private GoogleMap mMap;
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
Marker mCurrLocationMarker;
LocationRequest mLocationRequest;

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

    if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) 
        checkLocationPermission();
    

    // 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);



/**
 * Manipulates the map once available.
 * This callback is triggered when the map is ready to be used.
 * This is where we can add markers or lines, add listeners or move the camera. In this case,
 * we just add a marker near Sydney, Australia.
 * If Google Play services is not installed on the device, the user will be prompted to install
 * it inside the SupportMapFragment. This method will only be triggered once the user has
 * installed Google Play services and returned to the app.
 */
@Override
public void onMapReady(GoogleMap googleMap) 
    mMap = googleMap;

    // Add a marker in Sydney and move the camera
    mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);

    //Initialize Google Play Services
    if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) 
        if (ContextCompat.checkSelfPermission(this,
                Manifest.permission.ACCESS_FINE_LOCATION)
                == PackageManager.PERMISSION_GRANTED) 
            buildGoogleApiClient();
            mMap.setMyLocationEnabled(true);
        else 
            //Request Location Permission
            checkLocationPermission();
        
    
    else 
        buildGoogleApiClient();
        mMap.setMyLocationEnabled(true);
    


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


@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 = mMap.addMarker(markerOptions);
    //move map camera
    mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
    mMap.animateCamera(CameraUpdateFactory.zoomTo(11));
    //stop location updates
    if (mGoogleApiClient != null) 
        LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, (com.google.android.gms.location.LocationListener) this);
    



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

@Override
public void onProviderEnabled(String provider) 

@Override
public void onProviderDisabled(String provider) 

@Override
public void onConnected(@Nullable Bundle bundle) 

    mLocationRequest = new LocationRequest();
    mLocationRequest.setInterval(1000);
    mLocationRequest.setFastestInterval(1000);
    mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
    if (ContextCompat.checkSelfPermission(this,
            Manifest.permission.ACCESS_FINE_LOCATION)
            == PackageManager.PERMISSION_GRANTED) 
        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, (com.google.android.gms.location.LocationListener) this);
    


@Override
public void onConnectionSuspended(int i) 

@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) 

public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;

public boolean checkLocationPermission()
    if (ContextCompat.checkSelfPermission(this,
            Manifest.permission.ACCESS_FINE_LOCATION)
            != PackageManager.PERMISSION_GRANTED) 

        // Asking user if explanation is needed
        if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                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.

            //Prompt the user once explanation has been shown
            new AlertDialog.Builder(this)
                    .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(MapsActivity.this,
                                    new String[]Manifest.permission.ACCESS_FINE_LOCATION,
                                    MY_PERMISSIONS_REQUEST_LOCATION );
                        
                    )
                    .create()
                    .show();

         else 
            // No explanation needed, we can request the permission.
            ActivityCompat.requestPermissions(this,
                    new String[]Manifest.permission.ACCESS_FINE_LOCATION,
                    MY_PERMISSIONS_REQUEST_LOCATION);
        
        return false;
     else 
        return true;
    


@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. Do the
                // contacts-related task you need to do.
                if (ContextCompat.checkSelfPermission(this,
                        Manifest.permission.ACCESS_FINE_LOCATION)
                        == PackageManager.PERMISSION_GRANTED) 

                    if (mGoogleApiClient == null) 
                        buildGoogleApiClient();
                    
                    mMap.setMyLocationEnabled(true);
                

             else 

                // Permission denied, Disable the functionality that depends on this permission.
                Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show();
            
            return;
        
        // other 'case' lines to check for other permissions this app might request.
        // You can add here other case statements according to your requirement.
    

build.gradle

   apply plugin: 'com.android.application'

android 
compileSdkVersion 26
defaultConfig 
    applicationId "com.example.mrunal.firebase"
    minSdkVersion 19
    targetSdkVersion 26
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

buildTypes 
    release 
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    



 dependencies 
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:26.1.0'
implementation 'com.android.support:support-v4:26.1.0'
implementation 'com.android.support:cardview-v7:26.1.0'
implementation 'com.android.support:recyclerview-v7:26.1.0'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
implementation 'com.google.firebase:firebase-auth:11.8.0'
implementation 'com.google.firebase:firebase-storage:11.8.0'
implementation 'com.google.firebase:firebase-database:11.8.0'
implementation 'com.android.support:support-v4:26.1.0'
implementation 'com.google.android.gms:play-services-maps:11.8.0'
compile 'com.google.android.gms:play-services-location:11.8.0'
testImplementation 'junit:junit:4.12'
compile 'com.github.bumptech.glide:glide:3.7.0'
compile 'com.firebase:firebase-client-android:2.5.0'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'

apply plugin: 'com.google.gms.google-services'

【参考方案1】：

只是改变

import android.location.LocationListener;

到

import com.google.android.gms.location.LocationListener;