Android变成setContentView（）报错空指针异常

今天写一个例子，无缘无故报错空指针异常，定位错误竟然定位到了系统自动添加的setContentView（）中，从网上查到是因为我在布局文件中用到的一个控件View写用成了view，大写之后一切正常E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.jack.mycalculate, PID: 7687 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.jack.mycalculate/com.example.jack.mycalculate.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2659) at android.app.ActivityThread.access$900(ActivityThread.java:188) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1521) at android.os.Handler.dispatchMessage(Handler.java:111) at android.os.Looper.loop(Looper.java:194) at android.app.ActivityThread.main(ActivityThread.java:5714) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:984) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779) **Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference** at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:715) at android.view.LayoutInflater.rInflate(LayoutInflater.java:806) at android.view.LayoutInflater.parseInclude(LayoutInflater.java:890) at android.view.LayoutInflater.rInflate(LayoutInflater.java:802) at android.view.LayoutInflater.rInflate(LayoutInflater.java:809) at android.view.LayoutInflater.inflate(LayoutInflater.java:504) at android.view.LayoutInflater.inflate(LayoutInflater.java:414) at android.view.LayoutInflater.inflate(LayoutInflater.java:365) at android.support.v7.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:469) at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140) at **com.example.jack.mycalculate.MainActivity.onCreate(MainActivity.java:26)** at android.app.Activity.performCreate(Activity.java:6176) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1115) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2532) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2659) at android.app.ActivityThread.access$900(ActivityThread.java:188) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1521) at android.os.Handler.dispatchMessage(Handler.java:111) at android.os.Looper.loop(Looper.java:194) at android.app.ActivityThread.main(ActivityThread.java:5714) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:984) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)

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