相关疑难解决方法(0)

什么是空指针异常(java.lang.NullPointerException)以及它们的原因是什么？

可以使用哪些方法/工具来确定原因,以便停止异常导致程序过早终止？

我从Crashlytics收到错误,表明某些设备缺少com.google.android.webview.这怎么可能呢？

java.lang.RuntimeException: Unable to start activity   ComponentInfo{com.myapp.app/com.myapp.ReaderActivity}: android.view.InflateException: Binary XML file line #29: Error inflating class com.myapp.MyWebView
       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
       at android.app.ActivityThread.access$800(ActivityThread.java:144)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:135)
       at android.app.ActivityThread.main(ActivityThread.java:5221)
       at java.lang.reflect.Method.invoke(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:372)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: android.view.InflateException: Binary XML file line #29: Error inflating class com.myapp.MyWebView
       at android.view.LayoutInflater.createView(LayoutInflater.java:633)
       at uk.co.chrisjenx.calligraphy.CalligraphyLayoutInflater.createCustomViewInternal(SourceFile:206)
       at uk.co.chrisjenx.calligraphy.CalligraphyLayoutInflater.access$000(SourceFile:20)
       at uk.co.chrisjenx.calligraphy.CalligraphyLayoutInflater$PrivateWrapperFactory2.onCreateView(SourceFile:297)
       at android.view.LayoutInflater$FactoryMerger.onCreateView(LayoutInflater.java:177)
       at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:733)
       at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
       at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
       at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
       at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
       at uk.co.chrisjenx.calligraphy.CalligraphyLayoutInflater.inflate(SourceFile:60)
       at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
       at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
       at android.support.v7.app.ActionBarActivityDelegateBase.setContentView(SourceFile:228)
       at …

我只是简单地放了一个WebView布局.
当我在Android-O预览模拟器中运行项目时,它给出了以下错误:

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.mvvmrecyclerview, PID: 3527
java.lang.SecurityException: Signature check failed for com.example.mvvmrecyclerview
at android.os.Parcel.readException(Parcel.java:1915)
at android.os.Parcel.readException(Parcel.java:1861)
at com.google.android.gms.common.internal.zzv$zza$zza.zza(Unknown Source:41)
at com.google.android.gms.common.internal.zzf.zza(Unknown Source:0)
at com.google.android.gms.internal.zzzf$zzc.zzxQ(Unknown Source:0)
at com.google.android.gms.internal.zzzf$zzf.run(Unknown Source:0)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:457)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
at com.google.android.gms.internal.zzabx.run(Unknown Source:7)
at java.lang.Thread.run(Thread.java:764)

如果要生成此错误,只需创建一个新项目,将webview放入布局中,然后尝试在Android O模拟器中运行该项目.

谁能帮我这个.谢谢.

PS: Android Studio 2.4预览版3