构建我的应用程序并安装 Google Maps API 后，每当我倾向于搜索位置时，我的应用程序就会崩溃
Posted
技术标签:
【中文标题】构建我的应用程序并安装 Google Maps API 后，每当我倾向于搜索位置时，我的应用程序就会崩溃【英文标题】：After builing my app and Installing Google Maps API, My APP crashes anytime I tend to search for Location 【发布时间】：2019-02-26 17:19:40 【问题描述】：我是这个编程的新手，我发现很难通过这个阶段。成功构建APP后，我添加了谷歌地图以获取实时位置。执行此操作后，每次单击切换按钮时，我的应用都会崩溃。
如果您能帮我找出问题的根源，我会很高兴，因为这对我有很大帮助。下面是我的Logcat
09-22 15:59:04.636 4803-4803/com.example.mac.uberclone E/androidRuntime: FATAL EXCEPTION: main
Process: com.example.mac.uberclone, PID: 4803
java.lang.NullPointerException: Attempt to read from field 'int com.google.android.gms.location.LocationRequest.a' on a null object reference
at android.os.Parcel.createException(Parcel.java:1948)
at android.os.Parcel.readException(Parcel.java:1910)
at android.os.Parcel.readException(Parcel.java:1860)
at com.google.android.gms.internal.location.zza.transactAndReadExceptionReturnVoid(Unknown Source:10)
at com.google.android.gms.internal.location.zzap.zza(Unknown Source:9)
at com.google.android.gms.internal.location.zzas.zza(Unknown Source:44)
at com.google.android.gms.internal.location.zzaz.zza(Unknown Source:5)
at com.google.android.gms.internal.location.zzr.doExecute(Unknown Source:25)
at com.google.android.gms.common.api.internal.BaseImplementation$ApiMethodImpl.run(Unknown Source:10)
at com.google.android.gms.common.api.internal.zzag.execute(Unknown Source:71)
at com.google.android.gms.common.api.internal.zzbd.execute(Unknown Source:5)
at com.google.android.gms.common.api.internal.zzav.execute(Unknown Source:137)
at com.google.android.gms.internal.location.zzq.requestLocationUpdates(Unknown Source:14)
at com.example.mac.uberclone.Welcome.startLocationUpdate(Welcome.java:269)
at com.example.mac.uberclone.Welcome.onConnected(Welcome.java:283)
at com.google.android.gms.common.internal.GmsClientEventManager.onConnectionSuccess(Unknown Source:109)
at com.google.android.gms.common.api.internal.zzav.zzb(Unknown Source:22)
at com.google.android.gms.common.api.internal.zzaj.zzat(Unknown Source:92)
at com.google.android.gms.common.api.internal.zzaj.onConnected(Unknown Source:21)
at com.google.android.gms.common.api.internal.zzbd.onConnected(Unknown Source:7)
at com.google.android.gms.common.api.internal.zzp.onConnected(Unknown Source:5)
at com.google.android.gms.common.internal.zzf.onConnected(Unknown Source:2)
at com.google.android.gms.common.internal.BaseGmsClient$PostInitCallback.handleServiceSuccess(Unknown Source:130)
at com.google.android.gms.common.internal.BaseGmsClient$zza.deliverCallback(Unknown Source:62)
at com.google.android.gms.common.internal.BaseGmsClient$zza.deliverCallback(Unknown Source:2)
at com.google.android.gms.common.internal.BaseGmsClient$CallbackProxy.deliverCallback(Unknown Source:51)
at com.google.android.gms.common.internal.BaseGmsClient$zzb.handleMessage(Unknown Source:270)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
也在我的 Build Gradle 应用中
dependencies
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.github.glomadrian:MaterialAnimatedSwitch:1.1@aar'
implementation 'com.firebase:geofire-android:2.3.1'
implementation 'com.android.support:appcompat-v7:28.0.0-rc02'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.google.firebase:firebase-auth:16.0.3'
implementation 'com.google.android.gms:play-services-maps:15.0.1'
implementation 'com.google.android.gms:play-services-location:15.0.1'
implementation 'com.google.android.gms:play-services-analytics:16.0.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
//Add Library
implementation 'com.github.d-max:spots-dialog:0.7@aar'
implementation 'uk.co.chrisjenx:calligraphy:latest.integration'
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.rengwuxian.materialedittext:library:2.1.4'
implementation 'com.android.support:design:28.0.0'
implementation 'com.android.support:cardview-v7:28.0.0'
implementation 'com.google.firebase:firebase-core:16.0.3'
implementation 'com.google.firebase:firebase-database:16.0.2'
implementation 'com.firebaseui:firebase-ui-database:4.1.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
apply plugin: 'com.google.gms.google-services'
这是我的欢迎活动
package com.example.mac.uberclone;
import android.Manifest;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Handler;
import android.os.SystemClock;
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.util.Log;
import android.view.animation.Interpolator;
import android.view.animation.LinearInterpolator;
import android.widget.Toast;
import com.firebase.geofire.GeoFire;
import com.firebase.geofire.GeoLocation;
import com.github.glomadrian.materialanimatedswitch.MaterialAnimatedSwitch;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
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.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.firebase.auth.FirebaseAuth;
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
private GoogleMap mMap;
//Play Service
private static final int MY_PERMISSION_REQUEST_CODE = 7000;
private static final int PLAY_SERVICE_RES_REQUEST = 7001;
private LocationRequest locationRequest;
private GoogleApiClient mGoogleApiClient;
private Location mLastLocation;
private static int UPDATE_INTERVAL = 5000;
private static int FASTEST_INTERVAL = 3000;
private static int DISPLACEMENT = 10;
DatabaseReference drivers;
GeoFire geoFire;
Marker mCurrent;
MaterialAnimatedSwitch location_switch;
SupportMapFragment mapFragment;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_welcome);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
//Init View
location_switch = (MaterialAnimatedSwitch)findViewById(R.id.location_switch);
location_switch.setOnCheckedChangeListener(new MaterialAnimatedSwitch.OnCheckedChangeListener()
@Override
public void onCheckedChanged(boolean isOnline)
if (isOnline)
startLocationUpdate();
displayLocation();
Snackbar.make(mapFragment.getView(),"You are online",Snackbar.LENGTH_SHORT)
.show();
else
stopLocationUpdate();
mCurrent.remove();
Snackbar.make(mapFragment.getView(),"You are offline",Snackbar.LENGTH_SHORT)
.show();
);
//Geo Fire
drivers = FirebaseDatabase.getInstance().getReference("Drivers");
geoFire = new GeoFire (drivers);
setUpLocation();
//Press Ctrl+O
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults)
switch (requestCode)
case MY_PERMISSION_REQUEST_CODE:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
if (checkPlayServices())
buildGoogleApiClient();
createLocationRequest();
if (location_switch.isChecked())
displayLocation();
private void setUpLocation()
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)
//Request runtime permission
ActivityCompat.requestPermissions(this, new String[]
Manifest.permission.ACCESS_COARSE_LOCATION,
Manifest.permission.ACCESS_FINE_LOCATION
,MY_PERMISSION_REQUEST_CODE);
else
if (checkPlayServices())
buildGoogleApiClient();
createLocationRequest();
if (location_switch.isChecked())
displayLocation();
private void createLocationRequest()
LocationRequest locationRequest = LocationRequest.create();
locationRequest.setInterval(5000);
locationRequest.setFastestInterval(1000);
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
private void buildGoogleApiClient()
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
private boolean checkPlayServices()
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
if (resultCode != ConnectionResult.SUCCESS)
if (GooglePlayServicesUtil.isUserRecoverableError(resultCode))
GooglePlayServicesUtil.getErrorDialog(resultCode,this,PLAY_SERVICE_RES_REQUEST).show();
else
Toast.makeText(this, "This device is not supported", Toast.LENGTH_SHORT).show();
finish();
return false;
return true;
private void stopLocationUpdate()
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)
return;
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient,this);
private void displayLocation()
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)
return;
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (mLastLocation != null)
if (location_switch.isChecked())
final double latitude = mLastLocation.getLatitude();
final double longitude = mLastLocation.getLongitude();
//Update to firebase
geoFire.setLocation(FirebaseAuth.getInstance().getCurrentUser().getUid(), new GeoLocation(latitude, longitude), new GeoFire.CompletionListener()
@Override
public void onComplete(String key, DatabaseError error)
//Add marker
if (mCurrent != null)
mCurrent.remove(); //Remove already marker
mCurrent = mMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.fromResource(R.drawable.car))
.position(new LatLng(latitude,longitude))
.title("You"));
// Move camera to this position
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(latitude,longitude),15.0f));
//Draw animation rotate marker
rotateMarker(mCurrent,-360,mMap);
);
else
Log.d("Error", "Cannot get your location");
private void rotateMarker(final Marker mCurrent, final float i, GoogleMap mMap)
final Handler handler = new Handler();
final long start = SystemClock.uptimeMillis();
final float startRotation = mCurrent.getRotation();
final long duration = 1500;
final Interpolator interpolator = new LinearInterpolator();
handler.post(new Runnable()
@Override
public void run()
long elapsed = SystemClock.uptimeMillis() - start;
float t = interpolator.getInterpolation((float)elapsed/duration);
float rot = t*i+(1-t)*startRotation;
mCurrent.setRotation(-rot > 180?rot/2:rot);
if (t<1.0)
handler.postDelayed(this,16);
);
private void startLocationUpdate()
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)
return;
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,locationRequest,this);
@Override
public void onMapReady(GoogleMap googleMap)
mMap = googleMap;
@Override
public void onConnected(@Nullable Bundle bundle)
displayLocation();
startLocationUpdate();
@Override
public void onConnectionSuspended(int i)
mGoogleApiClient.connect();
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult)
@Override
public void onLocationChanged(Location location)
mLastLocation = location;
displayLocation();
【问题讨论】：
【参考方案1】：您尝试使用该行请求位置更新
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,locationRequest,this);
问题是你从不初始化locationRequest 变量。你有下一个功能
private void createLocationRequest()
LocationRequest locationRequest = LocationRequest.create();
locationRequest.setInterval(5000);
locationRequest.setFastestInterval(1000);
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
要解决您的问题，请在 createLocationRequest() 末尾添加这一行
this.locationRequest = locationRequest
【讨论】：
我尝试在 createLocationRequest() 下直接添加该行，因为当您尝试在最后添加它时，会出现错误。我仍然遇到同样的问题。如果你能告诉我你的意思，那就太好了 您可以修改createLocationRequest()如下：private void createLocationRequest() LocationRequest locationRequest = LocationRequest.create(); locationRequest.setInterval(5000); locationRequest.setFastestInterval(1000); locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY); this.locationRequest = locationRequest;
或者你可以删除你的 remove locationRequest 类变量。修改createLocationRequest() 以返回LocationRequest 实例并像LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,createLocationRequest(),this); 那样使用它
您发送的第一个修改解决了问题。我不得不在底部添加这个，一切都解决了。
现在的新问题是它在 API 22 的较低模拟器上工作。但是当我在 API 28 的模拟器上使用它时，它又崩溃了。您认为这是什么原因造成的？【参考方案2】：
private void createLocationRequest()
LocationRequest locationRequest = LocationRequest.create();
locationRequest.setInterval(5000);
locationRequest.setFastestInterval(1000);
locationRequest.setPriority (LocationRequest.PRIORITY_HIGH_ACCURACY);
this.locationRequest = locationRequest;
这就是问题的解决方案。
【讨论】：
以上是关于构建我的应用程序并安装 Google Maps API 后，每当我倾向于搜索位置时，我的应用程序就会崩溃的主要内容，如果未能解决你的问题，请参考以下文章
Swift：未安装 Google Maps 时，应用程序需要打开 Apple Maps
使用 Geolocation 和 Google Maps API [帮助]
为 Google Maps API v2 Android 发布流媒体方向