[問題] 關於android GPS的問題

[skywillnosky (Alfred)]

程式語言:android
編輯軟體:Eclipse


請問一下
GPS定位不是會用到
.getLongitude()
.getLatitude()
專門抓經緯度的函式
可是不知道為什麼
只要牽涉到這兩個函數
像是傳給一個double型別的變數
double x = xxx.getLongitude();
或是 xx.append(DoubletoString(xxx.getLongitude()));

程式就會跑不出來
有人知道為什麼嗎?
誠心請教<(_ _)>

PS:目前只有使用模擬器跑
完整程式碼:http://203.64.183.230/MyLocation.7z

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※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 125.230.112.78
※ 編輯: skywillnosky    來自: 125.230.112.78       (08/18 20:57)
推 nvidia:錯誤訊息是什麼
→ skywillnosky:記得android的模擬程式吧? 很遺憾 他毫不留情的給我
→ skywillnosky:跳出sorry的那個視窗
錯誤訊息:http://203.64.183.230/erorr.jpg
※ 編輯: skywillnosky    來自: 125.230.112.78       (08/18 22:44)
推 PsMonkey:應該有 Exception.printStackTrace() 之類的東西
推 PsMonkey:請附上該種錯誤訊息
→ nvidia:我說的是DDMS的LOGCAT
→ skywillnosky:不好意思 我找看看
找到了 蠻長的 我只顯示警告跟錯誤的部份可以吧?

/*************************************LogCat********************************/

08-19 13:30:27.677: WARN/dalvikvm(1343): threadid=3: thread exiting with
uncaught exception (group=0x4000fe70)
08-19 13:30:27.677: ERROR/AndroidRuntime(1343): Uncaught handler: thread main
exiting due to uncaught exception08-19 13:30:27.697:
ERROR/AndroidRuntime(1343): java.lang.RuntimeException: Unable to start
activity
ComponentInfo{com.demo.android.mylocation/com.demo.android.mylocation.MyLocation}:
java.lang.NullPointerException08-19 13:30:27.697:
ERROR/AndroidRuntime(1343):     at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2268)08-19
13:30:27.697: ERROR/AndroidRuntime(1343):     at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2284)08-19
13:30:27.697: ERROR/AndroidRuntime(1343):     at
android.app.ActivityThread.access$1800(ActivityThread.java:112)08-19
13:30:27.697: ERROR/AndroidRuntime(1343):     at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1692)08-19
13:30:27.697: ERROR/AndroidRuntime(1343):     at
android.os.Handler.dispatchMessage(Handler.java:99)08-19 13:30:27.697:
ERROR/AndroidRuntime(1343):     at
android.os.Looper.loop(Looper.java:123)08-19 13:30:27.697:
ERROR/AndroidRuntime(1343):     at
android.app.ActivityThread.main(ActivityThread.java:3948)08-19 13:30:27.697:
ERROR/AndroidRuntime(1343):     at
java.lang.reflect.Method.invokeNative(Native Method)08-19 13:30:27.697:
ERROR/AndroidRuntime(1343):     at
java.lang.reflect.Method.invoke(Method.java:521)08-19 13:30:27.697:
ERROR/AndroidRuntime(1343):     at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:782)08-19
13:30:27.697: ERROR/AndroidRuntime(1343):     at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540)08-19
13:30:27.697: ERROR/AndroidRuntime(1343):     at
dalvik.system.NativeStart.main(Native Method)08-19 13:30:27.697:
ERROR/AndroidRuntime(1343): Caused by: java.lang.NullPointerException08-19
13:30:27.697: ERROR/AndroidRuntime(1343):     at
com.demo.android.mylocation.MyLocation.updateStat(MyLocation.java:31)08-19
13:30:27.697: ERROR/AndroidRuntime(1343):     at
com.demo.android.mylocation.MyLocation.onCreate(MyLocation.java:18)08-19
13:30:27.697: ERROR/AndroidRuntime(1343):     at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)08-19
13:30:27.697: ERROR/AndroidRuntime(1343):     at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2231)08-19
13:30:27.697: ERROR/AndroidRuntime(1343):     ... 11 more08-19 13:30:36.889:
WARN/ActivityManager(568): Launch timeout has expired, giving up wake
lock!08-19 13:30:37.409: WARN/ActivityManager(568): Activity idle timeout
for HistoryRecord{436fa8f8
{com.demo.android.mylocation/com.demo.android.mylocation.MyLocation}}
※ 編輯: skywillnosky    來自: 125.230.108.106      (08/19 21:33)
→ skywillnosky:這樣可以嗎?= =還是要所有的logcat?
→ sirII:NullPointException,你對null做操作了,檢查一下你的參照
→ skywillnosky:參照指的是reference嗎?