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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  • Crash: no empty constructor
    via GitHub by khk624
    ,
    • 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 com.wenming.weiswift.ui.login.activity.MainActivity.onCreate(MainActivity.java:60) at android.app.Activity.performCreate(Activity.java:5356) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2163) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2258) at android.app.ActivityThread.access$800(ActivityThread.java:147) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1211) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:136) at android.app.ActivityThread.main(ActivityThread.java:5135) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:611) 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:1208) at android.support.v4.app.Fragment.instantiate(Fragment.java:420) ... 19 more

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