android.support.v4.app.Fragment$InstantiationException

Unable to instantiate fragment com.wenming.weiswift.ui.login.activity.MainActivity$6: make sure class name exists, is public, and has an empty constructor that is public

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This happens when you try to instantiate a class that can't be instantiated, either because the class object is abstract, an interface, an array class, a primitive type, void, or because the class has no nullary constructor.


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  • Stack trace

    • android.support.v4.app.Fragment$InstantiationException: Unable to instantiate fragment com.wenming.weiswift.ui.login.activity.MainActivity$6: make sure class name exists, is public, and has an empty constructor that is public at android.support.v4.app.Fragment.instantiate(Fragment.java:431) at android.support.v4.app.FragmentState.instantiate(Fragment.java:102) at android.support.v4.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:1952) at android.support.v4.app.FragmentController.restoreAllState(FragmentController.java:144) at android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:307) at android.support.v7.app.AppCompatActivity.onCreate(AppCompatActivity.java:84) at com.wenming.weiswift.ui.login.activity.MainActivity.onCreate(MainActivity.java:110) at android.app.Activity.performCreate(Activity.java:5206) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094) at com.qihoo360.mobilesafe.loader.c.callActivityOnCreate(SourceFile:98) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125) at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3553) at android.app.ActivityThread.access$700(ActivityThread.java:140) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1233) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4898) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.InstantiationException: can't instantiate class com.wenming.weiswift.ui.login.activity.MainActivity$6; no empty constructor at java.lang.Class.newInstanceImpl(Native Method) at java.lang.Class.newInstance(Class.java:1319) at android.support.v4.app.Fragment.instantiate(Fragment.java:420) ... 22 more

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