致命异常-启动时应用崩溃

Question

When I run my app I get this error, how should I fix this error, any ideas will be appreciated.

03-11 18:15:35.795: E/AndroidRuntime(5588): FATAL EXCEPTION: main
03-11 18:15:35.795: E/AndroidRuntime(5588): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.my_autrui/com.example.my_autrui.Login}: android.view.InflateException: Binary XML file line #64: Error inflating class com.facebook.widget.LoginButton
03-11 18:15:35.795: E/AndroidRuntime(5588):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2306)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2356)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at android.app.ActivityThread.access$600(ActivityThread.java:150)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1244)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at android.os.Looper.loop(Looper.java:137)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at android.app.ActivityThread.main(ActivityThread.java:5195)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at java.lang.reflect.Method.invokeNative(Native Method)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at java.lang.reflect.Method.invoke(Method.java:511)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at dalvik.system.NativeStart.main(Native Method)
03-11 18:15:35.795: E/AndroidRuntime(5588): Caused by: android.view.InflateException: Binary XML file line #64: Error inflating class com.facebook.widget.LoginButton
03-11 18:15:35.795: E/AndroidRuntime(5588):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:698)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:282)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at android.app.Activity.setContentView(Activity.java:1881)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at com.example.my_autrui.Login.onCreate(Login.java:26)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at android.app.Activity.performCreate(Activity.java:5104)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2260)
03-11 18:15:35.795: E/AndroidRuntime(5588):     ... 11 more
03-11 18:15:35.795: E/AndroidRuntime(5588): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.facebook.widget.LoginButton" on path: /data/app/com.example.my_autrui-1.apk
03-11 18:15:35.795: E/AndroidRuntime(5588):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:65)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at android.view.LayoutInflater.createView(LayoutInflater.java:552)
03-11 18:15:35.795: E/AndroidRuntime(5588):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:687)

Answer 1

From the log, it seems LoginButton class is not available which is supposed to be under package com.facebook.widget:

Caused by: java.lang.ClassNotFoundException: Didn't find class "com.facebook.widget.LoginButton" on path: /data/app/com.example.my_autrui-1.apk

Are you using a third party library? You need to add that as a dependency and make sure that while exporting the library is packaged as well.

For adding dependency on a third party, right click on the project and select Properties -> Java Build Path -> Libraries Tab. To check if the libraries are getting exported, in the same window check Order and Export tab. Make sure the Android Private Libraries are added and selected to be exported.

Answer 2

The problem is the package name of the button.

Check the comments here:

Error inflating class com.facebook.widget.LoginButton with Facebook SDK 4.0.1