Android key accumulation problem?

I have problem with key:

When my App is loading, i press back key many times (about 20 times). Via logcat, sometime i see:

Key pressed - back key 
Key Released - back key
Key pressed - back key
Key Released - back key

And sometime no log here. but when load finish, i'' see:

Key pressed - back key 
Key Released - back key
Key pressed - back key
Key Released - back key
Key pressed - back key 
Key Released - back key
Key开发者_高级运维 pressed - back key
Key Released - back key
...
enough 20 times

look like the phone save it to buffer :(

An the question, How can i remove this buffer? :((

Why don't you just override onBackPressed() and don't call super if your activity hasn't finished loading?