Android 第一行代码里的那个简易版的新闻应用出现了逻辑错误，下面是运行日志，大佬们帮忙看看

[wang.bk]

02-10 19:45:49.552 30222-30222/com.example.lab.android.nuc.fragmentbestpractice E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.lab.android.nuc.fragmentbestpractice, PID: 30222
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.lab.android.nuc.fragmentbestpractice/com.example.lab.android.nuc.fragmentbestpractice.MainActivity}: android.view.InflateException: Binary XML file line #7: Binary XML file line #7: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2793)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2864)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1567)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:156)
at android.app.ActivityThread.main(ActivityThread.java:6523)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:942)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832)
Caused by: android.view.InflateException: Binary XML file line #7: Binary XML file line #7: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #7: Error inflating class fragment
Caused by: java.lang.NullPointerException
at java.lang.VMClassLoader.findLoadedClass(Native Method)
at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:742)
at java.lang.ClassLoader.loadClass(ClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at android.support.v4.app.Fragment.isSupportFragmentClass(Fragment.java:499)
at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:3637)
at android.support.v4.app.FragmentController.onCreateView(FragmentController.java:111)
at android.support.v4.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:338)
at android.support.v4.app.BaseFragmentActivityApi14.onCreateView(BaseFragmentActivityApi14.java:39)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:67)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:788)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:738)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:869)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:832)
at android.view.LayoutInflater.inflate(LayoutInflater.java:518)
at android.view.LayoutInflater.inflate(LayoutInflater.java:426)
at android.view.LayoutInflater.inflate(LayoutInflater.java:377)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
at com.example.lab.android.nuc.fragmentbestpractice.MainActivity.onCreate(MainActivity.java:11)
at android.app.Activity.performCreate(Activity.java:6915)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2746)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2864)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1567)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:156)
at android.app.ActivityThread.main(ActivityThread.java:6523)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:942)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832)
02-10 19:45:49.563 30222-30222/com.example.lab.android.nuc.fragmentbestpractice I/Process: Sending signal. PID: 30222 SIG: 9

[hxz6688]

布局文件第7行初始化异常

[Krisez]

神奇的错误代码。。。
xml #7

[darkbjgiven]

android.view.InflateException: Binary XML file line #7: Binary XML file line #7:  一个是XML里布局出错了 Error inflating class fragment at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2793) 要不然就是 fragment类，LaunchActivity里有什么错误。 在贴一下代码吧。。。。