，这题目起的够骚情了，原创傲慢的上校哦，转载请标明：http://blog.csdn.net/aomandeshangxiao/article/details/7753421
其实有些方法也是从网上找来的，拿来主义，共同分享下（Fragment其他资料：android之Fragment（官网资料翻译））。
第一个错误：FragmentManagerImpl.saveFragmentBasicState
下面是log：
- E/AndroidRuntime(29923): FATAL EXCEPTION: main
- E/AndroidRuntime(29923): java.lang.NullPointerException
- E/AndroidRuntime(29923): at android.app.FragmentManagerImpl.saveFragmentBasicState(FragmentManager.java:1544)
- E/AndroidRuntime(29923): at android.app.FragmentManagerImpl.saveAllState(FragmentManager.java:1574)
- E/AndroidRuntime(29923): at android.app.Activity.onSaveInstanceState(Activity.java:1213)
- E/AndroidRuntime(29923): at android.app.Activity.performSaveInstanceState(Activity.java:1162)
- E/AndroidRuntime(29923): at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1287)
- E/AndroidRuntime(29923): at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:3208)
- E/AndroidRuntime(29923): at android.app.ActivityThread.handleStopActivity(ActivityThread.java:3266)
- E/AndroidRuntime(29923): at android.app.ActivityThread.access$900(ActivityThread.java:139)
- E/AndroidRuntime(29923): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1279)
- E/AndroidRuntime(29923): at android.os.Handler.dispatchMessage(Handler.java:99)
- E/AndroidRuntime(29923): at android.os.Looper.loop(Looper.java:156)
- E/AndroidRuntime(29923): at android.app.ActivityThread.main(ActivityThread.java:5005)
- E/AndroidRuntime(29923): at java.lang.reflect.Method.invokeNative(Native Method)
- E/AndroidRuntime(29923): at java.lang.reflect.Method.invoke(Method.java:511)
- E/AndroidRuntime(29923): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
- E/AndroidRuntime(29923): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
- E/AndroidRuntime(29923): at dalvik.system.NativeStart.main(Native Method)
看老半天log,没有琢磨明白，在网上找了下，说出现这个问题，主要是以下两个因素：
一是用了android.support.v4包,
二是FragmentActivity.
本人正是在从Fragment跳转到另一个Activity时候报的错，据说是个官方Bug，已经有程序员把这个问题提交到官方了 ， https://android-review.googlesource.com/#/c/31261/ 。下面看看他们提交的内容：
<span style="color: rgb(255, 0, 0);">If a fragment's saved view state is null and the user visible hint is true then the `result` bundle will have never been initialized to a value resulting in a `NullPointerException`.</span>
如果一个Fragment保存的视图状态为Null并且用户可见提示为true，那么'result' bundle(要保存的Bundle)会有一个微博初始化的值，然后导致空指针异常。
如何解决此问题呢？问题出在Save上，在有Fragment的Activity中重写onSaveInstanceState()方法，并且注释掉super.onSaveInstanceState（），这样就不会调用父类的onSaveInstanceState(outState)方法了，就不会报异常了。
- outState 对象为空..在onSaveInstanceState()函数中不使用到outState即可.
- [java] view plaincopy
- @Override
- protected void onSaveInstanceState(Bundle outState) {
- // TODO Auto-generated method stub
- //super.onSaveInstanceState(outState);
- }
第二个、使用ListFragment：java.lang.RuntimeException: Content has view with id attribute 'android.R.id.list' that is not a ListView class
在ListFragment中，想当然的以为，像其他Fragment一样：
- public class ListFragmentTest extends ListFragment {
- @Override
- public View onCreateView(LayoutInflater inflater, ViewGroup container,
- Bundle savedInstanceState) {
- View root = inflater.inflate(R.layout.list, null);
- return root;
- }
在list.xml里面 ：
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:orientation="vertical" >
- <TextView
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="@string/app_name"
- />
- <ListView
- android:id="@+id/list"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- ></ListView>
- </LinearLayout>
看下log：
- 07-16 15:43:22.026: E/AndroidRuntime(605): FATAL EXCEPTION: main
- 07-16 15:43:22.026: E/AndroidRuntime(605): java.lang.RuntimeException: Unable to start activity ComponentInfo{cn.demo/cn.demo.FragmentTestActivity}: android.view.InflateException: Binary XML file line #23: Error inflating class fragment
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.app.ActivityThread.access$600(ActivityThread.java:123)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.os.Handler.dispatchMessage(Handler.java:99)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.os.Looper.loop(Looper.java:137)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.app.ActivityThread.main(ActivityThread.java:4424)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at java.lang.reflect.Method.invokeNative(Native Method)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at java.lang.reflect.Method.invoke(Method.java:511)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at dalvik.system.NativeStart.main(Native Method)
- 07-16 15:43:22.026: E/AndroidRuntime(605): Caused by: android.view.InflateException: Binary XML file line #23: Error inflating class fragment
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:697)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.view.LayoutInflater.rInflate(LayoutInflater.java:739)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:251)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.app.Activity.setContentView(Activity.java:1835)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at cn.demo.FragmentTestActivity.onCreate(FragmentTestActivity.java:11)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.app.Activity.performCreate(Activity.java:4465)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
- 07-16 15:43:22.026: E/AndroidRuntime(605): ... 11 more
- 07-16 15:43:22.026: E/AndroidRuntime(605): Caused by: java.lang.RuntimeException: Content has view with id attribute 'android.R.id.list' that is not a ListView class
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.app.ListFragment.ensureList(ListFragment.java:402)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.app.ListFragment.onViewCreated(ListFragment.java:203)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:811)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1010)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.app.FragmentManagerImpl.addFragment(FragmentManager.java:1108)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.app.Activity.onCreateView(Activity.java:4243)
- 07-16 15:43:22.026: E/AndroidRuntime(605): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:673)
- 07-16 15:43:22.026: E/AndroidRuntime(605): ... 21 more
为什么呢？因为ListFragment里面已经提供了系统自带的ListView，这样写，当然出错。可以直接不重写OnCreatView方法，使用getListView()获取系统提供的ListView，但是获取的ListView设置Item间隔线只能getListView().setDivider(divider)，其参数为Drawable类型。当然如果只想简单的设置下Divider的颜色呢？
其实ListFragment当然运行自定义布局，但是Listview要用系统的：
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:orientation="vertical" >
- <TextView
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="@string/app_name"
- />
- <ListView
- android:id="@id/android:list"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- ></ListView>
- </LinearLayout>
在这里，就可以方便的设置listview的各个参数了。
