Activity起動時、期待する動作を実現する為に、以下のフラグを設定する場合がある。 Intent i = new Intent(); i.setFlags( Intent.FLAG_ACTIVITY_NEW_TASK ); startActivity( i ); http://developer.android.com/reference/android/content/Intent.html # Flags FLAGSDETAILS FLAG_ACTIVITY_BROUGHT_TO_FRONTThis flag is not normally set by application code, but set for you by the system as described in the launchMode documentation for the singleTask mod