Binary XML file line #6: Error inflating class fragment

今天学习Android的Fragment,发生了一个小的问题，尽然让我在这愁了一个多小时（晕），问题如下

2-23 15:08:21.576 29916-29916/com.example.fragment_study E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.fragment_study, PID: 29916
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.fragment_study/com.example.fragment_study.MainActivity}: android.view.InflateException: Binary XML file line #6: Binary XML file line #6: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2444)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2504)
at android.app.ActivityThread.access$900(ActivityThread.java:165)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1368)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:150)
at android.app.ActivityThread.main(ActivityThread.java:5546)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)
Caused by: android.view.InflateException: Binary XML file line #6: Binary XML file line #6: Error inflating class fragment
at android.view.LayoutInflater.inflate(LayoutInflater.java:558)
at android.view.LayoutInflater.inflate(LayoutInflater.java:434)
at android.view.LayoutInflater.inflate(LayoutInflater.java:377)
at com.android.internal.policy.PhoneWindow.setContentView(PhoneWindow.java:420)
at android.app.Activity.setContentView(Activity.java:2219)
at com.example.fragment_study.MainActivity.onCreate(MainActivity.java:16)
at android.app.Activity.performCreate(Activity.java:6367)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1110)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2397)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2504)
            at android.app.ActivityThread.access$900(ActivityThread.java:165)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1368)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:150)
            at android.app.ActivityThread.main(ActivityThread.java:5546)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)
Caused by: android.view.InflateException: Binary XML file line #6: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:801)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:723)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:854)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:817)
at android.view.LayoutInflater.inflate(LayoutInflater.java:534)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:434)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:377)
            at com.android.internal.policy.PhoneWindow.setContentView(PhoneWindow.java:420)
            at android.app.Activity.setContentView(Activity.java:2219)
            at com.example.fragment_study.MainActivity.onCreate(MainActivity.java:16)
            at android.app.Activity.performCreate(Activity.java:6367)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1110)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2397)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2504)
            at android.app.ActivityThread.access$900(ActivityThread.java:165)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1368)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:150)
            at android.app.ActivityThread.main(ActivityThread.java:5546)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)
Caused by: android.app.Fragment$InstantiationException: Trying to instantiate a class com.example.fragment_study.TitleFragment that is not a Fragment
at android.app.Fragment.instantiate(Fragment.java:609)
at android.app.Fragment.instantiate(Fragment.java:585)
at android.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2201)
at android.app.FragmentController.onCreateView(FragmentController.java:98)
at android.app.Activity.onCreateView(Activity.java:5674)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:773)
            at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:723)
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:854)
            at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:817)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:534)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:434)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:377)
            at com.android.internal.policy.PhoneWindow.setContentView(PhoneWindow.java:420)
            at android.app.Activity.setContentView(Activity.java:2219)
            at com.example.fragment_study.MainActivity.onCreate(MainActivity.java:16)
            at android.app.Activity.performCreate(Activity.java:6367)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1110)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2397)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2504)
            at android.app.ActivityThread.access$900(ActivityThread.java:165)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1368)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:150)
            at android.app.ActivityThread.main(ActivityThread.java:5546)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)
Caused by: java.lang.ClassCastException
            at android.app.Fragment.instantiate(Fragment.java:609)
            at android.app.Fragment.instantiate(Fragment.java:585)
            at android.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2201)
            at android.app.FragmentController.onCreateView(FragmentController.java:98)
            at android.app.Activity.onCreateView(Activity.java:5674)
            at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:773)
            at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:723)
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:854)
            at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:817)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:534)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:434)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:377)
            at com.android.internal.policy.PhoneWindow.setContentView(PhoneWindow.java:420)
            at android.app.Activity.setContentView(Activity.java:2219)
            at com.example.fragment_study.MainActivity.onCreate(MainActivity.java:16)
            at android.app.Activity.performCreate(Activity.java:6367)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1110)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2397)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2504)
            at android.app.ActivityThread.access$900(ActivityThread.java:165)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1368)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:150)
            at android.app.ActivityThread.main(ActivityThread.java:5546)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)

经过一番查资料，竟然发现是自己Fragment引入的包出现的问题：

应该是：

记下此问题，希望自己以后不要再犯