Modify the Decrement Method Udacity Japanese English

Modify the Decrement MethodYouTube↗ IA↗(long shot)
Education 1.4K views 7 likes 0 dislikes 22 May 2015

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MainActivity.java ファイルで数を減らすメソッドを書きます

In the MainActivity.java file, we modify the MainActivity decrement method.

まず整数の数量変数を作り

First we create an integer quantity variable and

２を初期値とします

initialize the value to two.

そして現在の値から１を引いた数が数量変数として更新されるようにします

Then we update the quantity variable to have a value equal to the current value of quantity minus one.

今回は現在の値が２なので

In this case, the current value of quantity will be two, so

２引く１で「１」となります

two minus one equals one.

数量を表示したら１であるようにします

So when we display quantity, it should have a value of one.

－ボタンをクリックすると画面では１になるようにします

When I click on the minus button, then it updates to one on the screen.

ブレイクポイントを追加しデバッグモードでアプリを実行します

I can add a breakpoint and run the app in debug mode.

－ボタンを押すとブレイクポイントが起動します

If I click on the minus button, the breakpoint is triggered.

ステップオーバーをクリックすると下の部分に数量変数が２になっているのが見えます

I can click step over, and then I immediately see the quantity variable is down here with a value of two.

もう一度ステップオーバーを押すと数量が１減っており

If I click step over again, then quantity has been decreased by one,

数量は１となりました

and now quantity equals one.

再開をクリックすると画面上も１に更新されます

If I click resume, then the screen updates to one.

細かい部品がうまく配置できました

Now we have all the small pieces in place.

次のビデオではピッカーの連携を完成させ

In the next video, we're going to finish hooking up the quantity picker so

何回でも押せるようにします

that it works when you tap it more than once.

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