android – 没有连接.调用Connect或等待onConnected()在onConnected内调用异常？

我为Google LOCATIOnClient API实现了这个onConnected回调：

@Override
public void onConnected(Bundle arg0) {
    if (lc != null) {
        lastKNownLOCATIOn = lc.getLastLOCATIOn();
        LOCATIOnrequest request = new LOCATIOnrequest();
        request.setPriority(LOCATIOnrequest.PRIORITY_HIGH_ACCURACY);
        request.setFastesTinterval(MIN_TIME_betweeN_LOCATION_updatES);
        request.setsmallestDisplacement(MIN_DISTANCE_betweeN_LOCATION_updatES);
        lc.requestLOCATIOnupdates(request,ll);
    }
}

出于某种原因,有时候这一行：

lastKNownLOCATIOn = lc.getLastLOCATIOn();

给我这个例外：

java.lang.IllegalStateException: Not connected. Call connect() and wait for onConnected() to be called.
   at com.google.android.gms.internal.de.bc()
   at com.google.android.gms.internal.ez.a()
   at com.google.android.gms.internal.ez$c.bc()
   at com.google.android.gms.internal.ey.getLastLOCATIOn()
   at com.google.android.gms.internal.ez.getLastLOCATIOn()
   at com.google.android.gms.LOCATIOn.LOCATIOnClient.getLastLOCATIOn()
   at com.citylifeapps.cups.HelputilS.UserLOCATIOn.onConnected(UserLOCATIOn.java:115)
   at com.google.android.gms.internal.de.aZ()
   at com.google.android.gms.internal.de$f.a()
   at com.google.android.gms.internal.de$f.a()
   at com.google.android.gms.internal.de$b.be()
   at com.google.android.gms.internal.de$a.handlemessage()
   at android.os.Handler.dispatchmessage(Handler.java:102)
   at android.os.Looper.loop(Looper.java:157)
   at android.app.ActivityThread.main(ActivityThread.java:5356)
   at java.lang.reflect.Method.invokeNative(Method.java)
   at java.lang.reflect.Method.invoke(Method.java:515)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
   at dalvik.system.NativeStart.main(NativeStart.java)

我真的不明白为什么会这样.很明显,我在运行connect方法并等待onConnected回调之后尝试使用LOCATIOnClient获取最后一个已知位置,因为我知道当我连接时调用onConnected回调,所以我怎么能得到“Not connected”. ..“例外？
有人知道吗？

谢谢.

@Override
protected void onStart() {
    super.onStart();
    mGoogleApiClient.connect();
}