实施 Google Api 客户端和位置侦听器时应用程序崩溃

Question

我正在尝试制作一个应用程序，使用 public void onLocationChanged(Location location) 在谷歌地图上跟踪用户的路径，但每次我尝试实现位置监听器时，我的应用程序都会崩溃。这是我的代码..如果您看到任何需要修复的内容，请告诉我。谢谢！

Android 清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="edu.carthage.haag.jacob.homework_application_android">

    <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme">
    <!--
             The API key for Google Maps-based APIs is defined as a string resource.
             (See the file "res/values/google_maps_api.xml").
             Note that the API key is linked to the encryption key used to sign the APK.
             You need a different API key for each encryption key, including the release key that is used to
             sign the APK for publishing.
             You can define the keys for the debug and release targets in src/debug/ and src/release/.
        -->


    <meta-data android:name="com.google.android.geo.API_KEY" android:value="AIzaSyD-2jUwPWvPzHmsdIiYuW9tLarxYe6AQwE" />

    <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />

    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <activity android:name="edu.carthage.haag.jacob.homework_application_android.MapsActivity"
        android:label="@string/title_activity_maps">

    </activity>

</application>

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

</manifest>

这是我的 MapsActivity.java 文件

package edu.carthage.haag.jacob.homework_application_android;

import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.graphics.Color;
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.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
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.common.api.PendingResult;
import com.google.android.gms.common.api.Status;
import com.google.android.gms.location.LocationListener;
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.MarkerOptions;
import com.google.android.gms.maps.model.Polyline;
import com.google.android.gms.maps.model.PolylineOptions;

import java.text.DateFormat;
import java.util.ArrayList;
import java.util.Date;

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

    private GoogleMap mMap;
    private final static int MY_PERMISSION_FINE_LOCATION = 101;
    GoogleApiClient mGoogleApiClient;
    private ArrayList<LatLng> points; //added
    Polyline line; //added
    private Context context;
    private static final long INTERVAL = 5000; //1 minute
    private static final long FASTEST_INTERVAL = 1000; // 1 minute
    private static final float SMALLEST_DISPLACEMENT = 0.05F; //quarter of a meter
    private LocationRequest mLocationRequest;

    private LocationManager mLocationManager;
    private float LOCATION_REFRESH_DISTANCE = 1;
    private long LOCATION_REFRESH_TIME = 100;
    //gets the initial gps coordinates
    private Location mLastLocation;

    String locationProvider;

    protected void createLocationRequest() {

//        LocationServices.FusedLocationApi.requestLocationUpdates(
//                mGoogleApiClient, mLocationRequest, this);
//
//        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
//            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
//        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);

        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addApi(LocationServices.API)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .build();

        mapFragment.getMapAsync(this);
        points = new ArrayList<LatLng>(); //added
        context = MapsActivity.this;

        //createLocationRequest();
    }

    @Override
    protected void onStart() {

        super.onStart();
        if (mGoogleApiClient != null) {
            mGoogleApiClient.connect();
        }

        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(INTERVAL);
        mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
        mLocationRequest.setSmallestDisplacement(SMALLEST_DISPLACEMENT); //added
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

        if (ContextCompat.checkSelfPermission(this,
                Manifest.permission.ACCESS_FINE_LOCATION)
                == PackageManager.PERMISSION_GRANTED) {
            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
        }
    }

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

        // Add a marker in Sydney and move the camer
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            mMap.setMyLocationEnabled(true);
        } else {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, MY_PERMISSION_FINE_LOCATION);
            }
        }


    }


    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case MY_PERMISSION_FINE_LOCATION:
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
                        mMap.setMyLocationEnabled(true);
                    }

                } else {
                    Toast.makeText(getApplicationContext(), "This app requires location permissions to be granted", Toast.LENGTH_LONG).show();
                    finish();
                }
                break;
        }
    }

    @Override
    public void onLocationChanged(Location location) {
        double latitude = location.getLatitude();
        double longitude = location.getLongitude();
        LatLng latLng = new LatLng(latitude, longitude); //you already have this

        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.position(latLng);
        markerOptions.title("New Position");
        markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
        //move map camera
        mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
        mMap.animateCamera(CameraUpdateFactory.zoomTo(11));

        points.add(latLng); //added

        redrawLine(); //added
    }

    private void redrawLine() {

        mMap.clear();  //clears all Markers and Polylines

        PolylineOptions options = new PolylineOptions().width(5).color(Color.BLUE).geodesic(true);
        for (int i = 0; i < points.size(); i++) {
            LatLng point = points.get(i);
            options.add(point);
        }
        //addMarker(); //add Marker in current position
        line = mMap.addPolyline(options); //add Polyline
    }

    @Override
    public void onConnected(@Nullable Bundle bundle) {

    }

    @Override
    public void onConnectionSuspended(int i) {

    }

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

    }

    //    @Override
//    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
//        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
//        switch (requestCode) {
//            case MY_PERMISSION_FINE_LOCATION:
//                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
//                    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
//                        mMap.setMyLocationEnabled(true);
//                    }
//
//                } else {
//                    Toast.makeText(getApplicationContext(), "This app requires location permissions to be granted", Toast.LENGTH_LONG).show();
//                    finish();
//                }
//                break;
//        }
//    }

}

Answer 1

试试这个。 在onstart()而不是oncreate ()中连接google api客户端

@Override
    protected void onStart() {
        super.onStart();
        if (mGoogleApiClient != null) {
            mGoogleApiClient.connect();
        }
    }

并使用此方法在oncreate()中初始化googleApi客户端并调用onCreate()

        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API).build();

希望对你有帮助

Answer 2

感谢大家的帮助，我能够找出我的问题。问题是我没有使用 onConnected() 方法，其中 ocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);叫做。现在我进行了更改，一切正常！

Answer 3

根据堆栈跟踪，您似乎正在尝试在连接 GoogleAPI 客户端之前访问位置。

因此，您应该在连接时请求位置。同样可以实现：

    if(mGoogleApiClient.isConnected()) {
            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
        }

或者您可以请求位置更新onConnected方法。

@Override
public void onConnected(@Nullable Bundle bundle) {
     LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}

你还没有按照我说的做，找到我测试的完整代码： 查看第 103 行和第 179 行

package edu.carthage.haag.jacob.homework_application_android;
import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.graphics.Color;
import android.location.Location;
import android.location.LocationManager;
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.devop.aashish.androiddemo.R;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
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.MarkerOptions;
import com.google.android.gms.maps.model.Polyline;
import com.google.android.gms.maps.model.PolylineOptions;

import java.util.ArrayList;

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

    private final static int MY_PERMISSION_FINE_LOCATION = 101;
    private static final long INTERVAL = 5000; //1 minute
    private static final long FASTEST_INTERVAL = 1000; // 1 minute
    private static final float SMALLEST_DISPLACEMENT = 0.05F; //quarter of a meter
    GoogleApiClient mGoogleApiClient;
    Polyline line; //added
    String locationProvider;
    private GoogleMap mMap;
    private ArrayList<LatLng> points; //added
    private Context context;
    private LocationRequest mLocationRequest;
    private LocationManager mLocationManager;
    private float LOCATION_REFRESH_DISTANCE = 1;
    private long LOCATION_REFRESH_TIME = 100;
    //gets the initial gps coordinates
    private Location mLastLocation;

    protected void createLocationRequest() {

//        LocationServices.FusedLocationApi.requestLocationUpdates(
//                mGoogleApiClient, mLocationRequest, this);
//
//        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
//            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
//        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);

        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addApi(LocationServices.API)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .build();

        mapFragment.getMapAsync(this);
        points = new ArrayList<LatLng>(); //added
        context = MapsActivity.this;

        //createLocationRequest();
    }

    @Override
    protected void onStart() {

        super.onStart();
        if (mGoogleApiClient != null) {
            mGoogleApiClient.connect();
        }

        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(INTERVAL);
        mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
        mLocationRequest.setSmallestDisplacement(SMALLEST_DISPLACEMENT); //added
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

        if (ContextCompat.checkSelfPermission(this,
                Manifest.permission.ACCESS_FINE_LOCATION)
                == PackageManager.PERMISSION_GRANTED) {
//            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
            if (mGoogleApiClient.isConnected()) {
                LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
            } else {
                Toast.makeText(context, "Google API not connected yet", Toast.LENGTH_SHORT).show();
            }
        }
    }

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

        // Add a marker in Sydney and move the camera
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            mMap.setMyLocationEnabled(true);
        } else {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, MY_PERMISSION_FINE_LOCATION);
            }
        }


    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case MY_PERMISSION_FINE_LOCATION:
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
                        mMap.setMyLocationEnabled(true);
                    }

                } else {
                    Toast.makeText(getApplicationContext(), "This app requires location permissions to be granted", Toast.LENGTH_LONG).show();
                    finish();
                }
                break;
        }
    }

    @Override
    public void onLocationChanged(Location location) {
        double latitude = location.getLatitude();
        double longitude = location.getLongitude();
        LatLng latLng = new LatLng(latitude, longitude); //you already have this

        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.position(latLng);
        markerOptions.title("New Position");
        markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
        //move map camera
        mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
        mMap.animateCamera(CameraUpdateFactory.zoomTo(11));

        points.add(latLng); //added

        redrawLine(); //added
    }

    private void redrawLine() {

        mMap.clear();  //clears all Markers and Polylines

        PolylineOptions options = new PolylineOptions().width(5).color(Color.BLUE).geodesic(true);
        for (int i = 0; i < points.size(); i++) {
            LatLng point = points.get(i);
            options.add(point);
        }
        //addMarker(); //add Marker in current position
        line = mMap.addPolyline(options); //add Polyline
    }

    @Override
    public void onConnected(@Nullable Bundle bundle) {
        if (ContextCompat.checkSelfPermission(this,
                Manifest.permission.ACCESS_FINE_LOCATION)
                == PackageManager.PERMISSION_GRANTED) {
            if (mGoogleApiClient.isConnected()) {
                Toast.makeText(context, "Google API connected", Toast.LENGTH_SHORT).show();
                LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
            } else {
                Toast.makeText(context, "Google API not connected yet", Toast.LENGTH_SHORT).show();
            }
        }
    }

    @Override
    public void onConnectionSuspended(int i) {
        mGoogleApiClient.connect();
    }

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

    }

    //    @Override
//    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
//        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
//        switch (requestCode) {
//            case MY_PERMISSION_FINE_LOCATION:
//                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
//                    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
//                        mMap.setMyLocationEnabled(true);
//                    }
//
//                } else {
//                    Toast.makeText(getApplicationContext(), "This app requires location permissions to be granted", Toast.LENGTH_LONG).show();
//                    finish();
//                }
//                break;
//        }
//    }
}