android 遇到一个奇怪的报错 求大神解答

[樑枫]

先贴上错误信息：
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.huarui/com.huarui.view.activity.AddDeviceActivity}: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2205)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2255)
at android.app.ActivityThread.access$600(ActivityThread.java:148)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1241)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5102)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:564)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
at java.util.ArrayList.get(ArrayList.java:304)
at com.huarui.view.activity.AddDeviceActivity.findView(AddDeviceActivity.java:370)
at com.huarui.view.activity.AddDeviceActivity.onCreate(AddDeviceActivity.java:296)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2169)
... 11 more
java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
at java.util.ArrayList.get(ArrayList.java:304)
at com.huarui.view.activity.AddDeviceActivity.findView(AddDeviceActivity.java:370)
at com.huarui.view.activity.AddDeviceActivity.onCreate(AddDeviceActivity.java:296)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2169)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2255)
at android.app.ActivityThread.access$600(ActivityThread.java:148)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1241)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5102)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:564)
at dalvik.system.NativeStart.main(Native Method)

这是报错里面涉及到的代码，（强调一下是在onCreate里面的主线程代码，并且没有工作线程有改动这个列表）：
elecInsFloorList1.addAll(DevInfoAction.get().getFloorInfoList());
if (elecInsFloorList1.size() <= 0) {
elecInsText1.setText("aaa");
} else {
elecInsRoomList1.addAll(elecInsFloorList1.get(0).getRoomInFloors());//这里就是370行
}

这就是小弟最不懂的地方了。首先假如这个列表是null，应该不是报java.lang.NullPointerException吗？假如不是空指针异常，那我已经判断过列表的大小了，为何还会在else里面报错，而且报错的原因是列表大小为零？

[樑枫]

在线等啊，各位大神，求救啊

[ldyzxn]

list.add(null)

[节操在此]

clean一下，有些时候编译器会抽风的

[樑枫]

引用 3 楼 u014027694 的回复:

clean一下，有些时候编译器会抽风的

不是eclipse，是用AS编译的

[节操在此]

引用 4 楼 liangfeng89 的回复:

[quote=引用 3 楼 u014027694 的回复:] clean一下，有些时候编译器会抽风的

不是eclipse，是用AS编译的[/quote] 你打下断点看看