July 2014
Intermediate to advanced
248 pages
5h 19m
Chinese
Content preview from Android Developer Tools深入精要
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98
|
第七章：測試程式碼
[Page-103]
圖
7-5
執行偵錯範例
執行偵錯工具
設定好中斷點之後，在專案上按右鍵選擇
Debug As
（以…偵錯）
→
Android Application
（圖
7-6
）來執行偵錯工具。
圖
7-6
透過右鍵選單執行偵錯工具
偵錯（
Debugging
）
|
99
[Page-104]
這基本上是我用來執行
app
的一般程序，我會從
Android
裝置選擇工具（
Android Device
Chooser
）裡選擇裝置，程式執行到某個想要開始偵錯的中斷點，此時會顯示對話框（圖
7-7
）詢問是否開啟偵錯視圖；我選擇「
Yes
」（且勾選下方的方框來允許下次的執行），
則開啟偵錯視圖。
圖
7-7
偵錯設定對話框
單步執行程式碼
此時，已顯示偵錯視圖且偵錯器已暫停在我的第一個中斷點（如圖
7-8
）；注意到第一
個中斷點（第
28
行）已被突顯出來，現在我可以利用其他工具更加了解這時刻的程式，
特別是利用「變數」（
Variables
）分頁（位於右上角）判斷
VALUE
變數目前的狀態；
在這時間點上會是
null
，因為還沒有如同使用者般地輸入數值。
為了處理下個中斷點，我需要讓偵錯器繼續執行，這可以透過偵錯工具列裡的按鈕（ ）
來繼續（
Resume
）（如圖
7-9
），並前往下個中斷點。 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.