尝试在服务启动但应用程序崩溃时调用位置权限
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【中文标题】尝试在服务启动但应用程序崩溃时调用位置权限【英文标题】：Trying to call location permission when service is started but app crashes 【发布时间】：2020-08-19 08:22:16 【问题描述】：我的应用中有一个按钮，可以在我的应用中启动一项服务。该服务需要获得许可才能工作。我已经向服务添加了权限请求，但是当我按下按钮启动服务时，我的应用程序崩溃了。这里是服务
public class MQTTService extends Service
private PowerManager.WakeLock wakeLock;
private MqttandroidClient clientPhone;
public static String uri;
private FusedLocationProviderClient fusedLocationClient;
private LocationRequest locationRequest;
public void MQTTService()
clientPhone = new MqttAndroidClient(this, serverUri, clientId);
clientPhone.setCallback(new MqttCallback()
public void connectComplete(boolean b, String s)
@Override
public void connectionLost(Throwable throwable)
@Override
public void messageArrived(String topic, MqttMessage mqttMessage) throws Exception
Log.w("Mqtt", mqttMessage.toString());
Log.e("message ", String.valueOf(mqttMessage));
Toast.makeText(MQTTService.this, "Crash Occurred", Toast.LENGTH_SHORT).show();
Intent dialogIntent = new Intent(MQTTService.this, alert.class);
dialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(dialogIntent);
@Override
public void deliveryComplete(IMqttDeliveryToken iMqttDeliveryToken)
);
@Override
public IBinder onBind(Intent intent)
// TODO: Return the communication channel to the service.
throw new UnsupportedOperationException("Not yet implemented");
@Override
public void onCreate()
super.onCreate();
callPermissions();
requestLocationUpdates();
@Override
public void onDestroy()
super.onDestroy();
if (wakeLock.isHeld())
wakeLock.release();
if(clientPhone!=null)
/*unregisterResources is needed,otherwise receive this error:
has leaked ServiceConnection org.eclipse.paho.android.service.MqttAndroidClient*/
try
clientPhone.unregisterResources();
clientPhone.close();
clientPhone.disconnect();
catch (Exception e)
e.printStackTrace();
unregisterReceiver(m_ScreenOffReceiver);
m_ScreenOffReceiver = null;
public void requestLocationUpdates()
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PermissionChecker.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PermissionChecker.PERMISSION_GRANTED)
fusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
locationRequest = new LocationRequest();
locationRequest.setInterval(2000);
locationRequest.setFastestInterval(4000);
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
fusedLocationClient.requestLocationUpdates(locationRequest, new LocationCallback()
@Override
public void onLocationResult(LocationResult locationResult)
super.onLocationResult(locationResult);
uri = "http://maps.google.com/maps?saddr=" + locationResult.getLastLocation().getLatitude() + "," + locationResult.getLastLocation().getLongitude();
, getMainLooper());
public void callPermissions()
String[] permissions = Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION;
Permissions.check(this/*context*/, permissions, null/*rationale*/, null/*options*/, new PermissionHandler()
@Override
public void onGranted()
// do your task.
requestLocationUpdates();
@Override
public void onDenied(Context context, ArrayList<String> deniedPermissions)
super.onDenied(context, deniedPermissions);
callPermissions();
);
这是我的堆栈跟踪
2020-05-04 20:32:29.440 17319-17357/com.example.carcrashdetection E/Perf: Fail to get file list com.example.carcrashdetection
2020-05-04 20:32:29.440 17319-17319/com.example.carcrashdetection E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.carcrashdetection, PID: 17319
java.lang.RuntimeException: Unable to create service com.example.carcrashdetection.MQTTService: android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
at android.app.ActivityThread.handleCreateService(ActivityThread.java:4082)
at android.app.ActivityThread.access$1800(ActivityThread.java:231)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1968)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7682)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:516)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
Caused by: android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
at android.app.ContextImpl.startActivity(ContextImpl.java:964)
at android.app.ContextImpl.startActivity(ContextImpl.java:940)
at android.content.ContextWrapper.startActivity(ContextWrapper.java:383)
at com.nabinbhandari.android.permissions.Permissions.check(Permissions.java:121)
at com.example.carcrashdetection.MQTTService.callPermissions(MQTTService.java:282)
at com.example.carcrashdetection.MQTTService.onCreate(MQTTService.java:95)
at android.app.ActivityThread.handleCreateService(ActivityThread.java:4070)
at android.app.ActivityThread.access$1800(ActivityThread.java:231)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1968)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7682)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:516)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
2020-05-04 20:32:29.440 17319-17357/com.example.carcrashdetection E/Perf: getFolderSize() : Exception_1 = java.lang.NullPointerException: Attempt to get length of null array
2020-05-04 20:32:29.444 17319-17319/com.example.carcrashdetection I/Process: Sending signal. PID: 17319 SIG: 9
我在原始服务中有更多方法，但出于这个问题的目的，我去掉了它们，因为我不认为它们是问题所在。自从我添加了定位方法和访问位置的权限后，我的应用程序开始崩溃。我是否调用了错误的权限？
【问题讨论】：
【参考方案1】：您的问题与权限无关。你的应用在这里崩溃了：
2020-05-04 20:32:29.440 17319-17357/com.example.carcrashdetection E/Perf: getFolderSize() : Exception_1 = java.lang.NullPointerException: Attempt to get length of null array
【讨论】：
我认为它为空，因为权限将我发送出应用程序以授予覆盖数组，因此 firebase 没有任何时间加载。我将覆盖权限移至登录活动，现在它不会崩溃以上是关于尝试在服务启动但应用程序崩溃时调用位置权限的主要内容，如果未能解决你的问题，请参考以下文章
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