传递到onLocationChanged定位对象为空？ [英] Location object passed into onLocationChanged is null?
问题描述
我有我的应用程序实现LocationListener的，我的onLocationChanged方法已经可以正常使用，直到最近的活动。出于某种原因，Location对象被传递到方法为空。我的问题是，为什么是空？是否在传递一个空对象，如果它不能获得一个位置？
I have an activity that implements LocationListener in my application and my onLocationChanged method has been working perfectly up until recently. For some reason the Location object being passed into the method is null. My question is, why is it null? Does it pass in a null object if it cannot acquire a location?
我的GPS是，我有它设置为从GPS拉的位置，我知道我的GPS可以得到一个固定在我为我所用的地图，把它找到了我。
My GPS is on and I have it set to pull a location from the GPS, and I know my GPS can get a fix on me as I used Maps and had it locate me.
另外，我有设置为允许我的应用程序：
Also, I have the permission for my app set as:
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.ACCESS_GPS" />
<uses-permission android:name="android.permission.ACCESS_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
我不相信权限是问题虽然，因为我的活动是事前工作，从那以后，我不会改变的权限。
I don't believe permissions is the issue though, as my activity was working beforehand and I have not altered the permissions since then.
下面是code，它确定物体位置的提供者：
Here is the code that determines the provider of the location object:
String locationProvider = this.mLocationManager.getBestProvider(mLocationCriteria, true);
this.onLocationChanged(this.mLocationManager.getLastKnownLocation(locationProvider));
下面是错误的LogCat中输出：
Here is the LogCat output of the error:
08-08 18:25:26.310: ERROR/MapActivity(6447): Couldn't get connection factory client
08-08 18:26:18.771: ERROR/AndroidRuntime(6447): Uncaught handler: thread main exiting due to uncaught exception
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): java.lang.IllegalStateException: Could not execute method of the activity
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at android.view.View$1.onClick(View.java:2031)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at android.view.View.performClick(View.java:2364)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at android.view.View.onTouchEvent(View.java:4179)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at android.view.View.dispatchTouchEvent(View.java:3709)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at android.view.ViewRoot.handleMessage(ViewRoot.java:1691)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at android.os.Handler.dispatchMessage(Handler.java:99)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at android.os.Looper.loop(Looper.java:123)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at android.app.ActivityThread.main(ActivityThread.java:4363)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at java.lang.reflect.Method.invokeNative(Native Method)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at java.lang.reflect.Method.invoke(Method.java:521)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at dalvik.system.NativeStart.main(Native Method)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): Caused by: java.lang.reflect.InvocationTargetException
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at com.proto.screens.MyMapActivity.onLocateUserClick(MyMapActivity.java:147)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at java.lang.reflect.Method.invokeNative(Native Method)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at java.lang.reflect.Method.invoke(Method.java:521)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at android.view.View$1.onClick(View.java:2026)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): ... 21 more
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): Caused by: java.lang.NullPointerException
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): at com.proto.screens.MyMapActivity.onLocationChanged(MyMapActivity.java:135)
08-08 18:26:18.880: ERROR/AndroidRuntime(6447): ... 25 more
[更新] 我已经测试过同样的code其他设备上（一个HTC的myTouch 3G是precise），并将其与GPS完美的作品但是在我的摩托罗拉Droid它崩溃。
[UPDATE] I have tested the same code on another device (an HTC MyTouch 3G to be precise) and it works flawlessly with the GPS, however on my Motorola Droid it crashes.
推荐答案
我已经解决了这一问题，虽然我不知道为什么这个工作。
I have fixed the problem, though I'm not sure why this worked.
我所做的是我把我的活动请求的最佳位置提供者（在这种情况下，GPS）位置更新，并设置触发我的功能onces它具有精确到50米的位置。我在做什么之前，只是试图检索一个已知的位置，但现在我有它设置要等到GPS可以得到修复。
What I did is I set my activity to request location updates from the best location provider (in this case the GPS) and set it to trigger my function onces it has a location accurate down to 50 meters. What I was doing before was just attempting to retrieve the last known location, but now I have it set to wait until the GPS can get a fix.
也许有人不存储我的最后一个已知位置，因此被返回null。
Perhaps it wasn't storing my last known location and thus was returning null.
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