April 2014
Intermediate to advanced
260 pages
5h
Japanese
Content preview from 実践 Android Developer Tools
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106
7
章 コードをテストする
LogCat
システムログメッセージを表示する。
コード、アウトラインタブ
現在実行中のソースコードとアウトラインビューを表示する。
図7-3 デバッグパースペクティブ
7.2.4
デバッグの実際
では、特定のコードをどのようにデバッグするかをはっきりと示す例を見てみよう。デバッガを使っ
て実行サイクルの別々の地点で値を確認する方法を示すために、非常に簡単なコードを書いた（図7-4
参照）。このコードの機能は単純なものである。ユーザーが入力した値を受け取り、内部変数に格納し、
ボタンが押されたらその値を画面に表示する。アプリケーションを実行すると、図7-5のような画面
になる。
7.2
デバッグ
107
図7-4 サンプルソースコードをデバッグする
7.2.4.1
ブレークポイントを設定する
デバッグの最初のステップは、コードの適切な位置にブレークポイントを設定することだ。このサ
ンプルでは、2 つの地点での
VALUE
変数の値を知りたい。最初の位置は、ユーザーが何も入力しない
うちで、この場合は 28 行目である。値が設定されたあとの値もチェックしたいので、30行にもブレー
クポイントを設定している。ブレークポイントは、行番号を右クリックし、「Toggle Breakpoint」を選 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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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.