TOASTの引数で整数を渡すことができるが、結局は２パターンのどちらかしか選べないようです。
Toast.LENGTH_LONG：長め(4秒ぐらい)
Toast.LENGTH_SHORT：短め(2秒ぐらい)
http://android.roof-balcony.com/view/toast/
http://www.mail-archive.com/android-developers@googlegroups.com/msg48322.html
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