back跟home鍵的差別??

我知道這是一個舊問題了!!但是我的好奇心讓我晚上睡不著跑去試

我有拜讀過01站友的一篇文章
http://s8726319.tumblr.com/post/2561715358

但是我試過幾個軟體..在這些軟體沒有退出或結束鍵~如QuickMark
當我用back鍵去退出時...再去用程序管理員進去看~他是backgroud process
為什麼他不是empty process呢...


機型SE Xperia Play 2.3.4
程序管理員


----------------------
另外我也去查了一下

The 'back' key works similar to ESC in the desktop version of Processing. (Pressing ESC in the emulator actually emulates hitting the 'back' key, though it may beep at you first.) By default, this will exit your application. If you want to do something smarter, override keyPressed() and set 'key' to 0 so that the key doesn't get picked up by the base class:


void keyPressed() {
// doing other things here, and then:
if (key == CODED && keyCode == KeyEvent.KEYCODE_BACK) {
keyCode = 0; // don't quit by default
}
}

因為back在android是退出的命令
是不是這些程式設計師在設計程式是把back模擬成像電腦的back~卻沒想到退出的問題~
所以這種程式在按back跟home退出~其實都是一樣丟到background~