在《android开发基础轮播图，组合控件，自定义属性，自动轮播》这个系列编写 组合控件的时候，跟着老师敲完但是开启的时候闪退了。

错误显示：

1. 2020-12-13 15:29:51.197 10080-10080/? E/AndroidRuntime: FATAL EXCEPTION: main
2.   Process: com.example.alipay.myapplication, PID: 10080
3.   java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.alipay.myapplication/com.example.alipay.myapplication.superMainActivity}: android.view.InflateException: Binary XML file line #10: Binary XML file line #10: Error inflating class com.example.alipay.myapplication.views.WuLooperPager
4.     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
5.     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
6.     at android.app.ActivityThread.-wrap11(Unknown Source:0)
7.     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
8.     at android.os.Handler.dispatchMessage(Handler.java:105)
9.     at android.os.Looper.loop(Looper.java:164)
10.     at android.app.ActivityThread.main(ActivityThread.java:6541)
11.     at java.lang.reflect.Method.invoke(Native Method)
12.     at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
13.     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
14.    Caused by: android.view.InflateException: Binary XML file line #10: Binary XML file line #10: Error inflating class com.example.alipay.myapplication.views.WuLooperPager
15.    Caused by: android.view.InflateException: Binary XML file line #10: Error inflating class com.example.alipay.myapplication.views.WuLooperPager
16.    Caused by: java.lang.reflect.InvocationTargetException
17.     at java.lang.reflect.Constructor.newInstance0(Native Method)
18.     at java.lang.reflect.Constructor.newInstance(Constructor.java:334)
19.     at android.view.LayoutInflater.createView(LayoutInflater.java:647)
20.     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)
21.     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
22.     at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
23.     at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
24.     at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
25.     at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
26.     at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
27.     at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:469)
28.     at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
29.     at com.example.alipay.myapplication.superMainActivity.onCreate(superMainActivity.java:12)
30.     at android.app.Activity.performCreate(Activity.java:6975)
31.     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
32.     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
33.     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
34.     at android.app.ActivityThread.-wrap11(Unknown Source:0)
35.     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
36.     at android.os.Handler.dispatchMessage(Handler.java:105)
37.     at android.os.Looper.loop(Looper.java:164)
38.     at android.app.ActivityThread.main(ActivityThread.java:6541)
39.     at java.lang.reflect.Method.invoke(Native Method)
40.     at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
41.     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
42.    Caused by: android.view.InflateException: Binary XML file line #30: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
43.    Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
44.     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:764)
45.     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
46.     at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
47.     at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
48.     at android.view.LayoutInflater.rInflate(LayoutInflater.java:866)
49.     at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
50.     at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
51. 2020-12-13 15:29:51.209 10080-10080/? E/AndroidRuntime:   at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
52.     at com.example.alipay.myapplication.views.WuLooperPager.<init>(WuLooperPager.java:23)
53.     at com.example.alipay.myapplication.views.WuLooperPager.<init>(WuLooperPager.java:18)
54.     at java.lang.reflect.Constructor.newInstance0(Native Method)
55.     at java.lang.reflect.Constructor.newInstance(Constructor.java:334)
56.     at android.view.LayoutInflater.createView(LayoutInflater.java:647)
57.     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)
58.     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
59.     at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
60.     at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
61.     at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
62.     at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
63.     at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
64.     at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:469)
65.     at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
66.     at com.example.alipay.myapplication.superMainActivity.onCreate(superMainActivity.java:12)
67.     at android.app.Activity.performCreate(Activity.java:6975)
68.     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
69.     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
70.     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
71.     at android.app.ActivityThread.-wrap11(Unknown Source:0)
72.     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
73.     at android.os.Handler.dispatchMessage(Handler.java:105)
74.     at android.os.Looper.loop(Looper.java:164)
75.     at android.app.ActivityThread.main(ActivityThread.java:6541)
76.     at java.lang.reflect.Method.invoke(Native Method)
77.     at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
78.     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)