AnimDownloadProgressButton Resume Bug!

[jiamingDuan]

at com.xiaochen.progressroundbutton.AnimDownloadProgressButton.onSaveInstanceState(AnimDownloadProgressButton.java:622)
java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.String java.lang.CharSequence.toString()' on a null object reference
at com.xiaochen.progressroundbutton.AnimDownloadProgressButton.onSaveInstanceState(AnimDownloadProgressButton.java:622)
at android.view.View.dispatchSaveInstanceState(View.java:22195)
at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:4780)
at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:4780)
at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:4780)
at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:4780)
at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:4780)
at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:4780)
at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:4780)
at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:4780)
at android.view.View.saveHierarchyState(View.java:22178)