1.报错信息如下

java.lang.RuntimeException: Unable to start activity ComponentInfo{yixing.artshow/yixing.artshow.activity.SetInputActivity}: 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:2325)                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)                      at android.app.ActivityThread.access$800(ActivityThread.java:151)                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)                      at android.os.Handler.dispatchMessage(Handler.java:102)                      at android.os.Looper.loop(Looper.java:135)                      at android.app.ActivityThread.main(ActivityThread.java:5254)                      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:903)                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)                   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.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 com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:378)                      at android.app.Activity.setContentView(Activity.java:2145)                      at yixing.artshow.activity.SetInputActivity.onCreate(SetInputActivity.java:21)                      at android.app.Activity.performCreate(Activity.java:5990)                      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)                       at android.app.ActivityThread.access$800(ActivityThread.java:151)                       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)                       at android.os.Handler.dispatchMessage(Handler.java:102)                       at android.os.Looper.loop(Looper.java:135)                       at android.app.ActivityThread.main(ActivityThread.java:5254)                       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:903)                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 

花了一个多小时找错竟然是xml中  

<view style="@style/me_line"/>

关键字view写错了，而且没有报错

应改成

iew style="@style/me_line"/>

大写 大写 大写

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