Jetpack Compose Academy · レッスン

有効、無効、読み込み中の状態

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「有効、無効、読み込み中の状態」はCoddyKit上の無料Jetpack Compose Academyレッスンです。これはレッスン3/4です。下記で完全なレッスンを無料で読むことができます。その後、ブラウザ内の組み込みコードエディタと24時間対応のAIチューターでハンズオン演習できます。これはJetpack Compose Academy学習パスの一部であり、ウェブとCoddyKitアプリ全体で進捗が同期されます。 Jetpack Compose Academyコースには全4レッスンが含まれています。

このレッスンの一部はまだ翻訳されておらず、英語で表示されています。

Buttons Have Moods

A good button reflects reality: ready, blocked, or working. Compose lets you express these states so users always know what is possible. 🚦

The enabled Parameter

Every button takes an enabled flag. Set it to false and the button greys out and ignores taps automatically.

Button(
    onClick = { submit() },
    enabled = false
) { Text("Submit") }

Drive enabled From State

The real power is binding enabled to state. Tie it to validation so the button only activates when input is ready.

Button(
    onClick = { submit() },
    enabled = name.isNotBlank()
) { Text("Submit") }

Disabled Means Blocked

A disabled button still appears, so users see the action exists. Its faded look signals why not yet without an error message.

Show Progress While Working

For slow actions, show a loading state. Track a boolean and swap the label for a spinner while the work runs.

var loading by remember { mutableStateOf(false) }

Disable During Loading

While loading, set enabled = !loading so users cannot double-tap and fire the same action twice.

Button(
    onClick = { loading = true },
    enabled = !loading
) { Text("Save") }

Swap In a Spinner

Inside the content, branch on the flag: show a small CircularProgressIndicator when loading, the label otherwise.

Button(onClick = { }, enabled = !loading) {
    if (loading) CircularProgressIndicator(Modifier.size(18.dp))
    else Text("Save")
}

Size the Spinner Down

The default spinner is large. Constrain it with a Modifier.size so it fits neatly where the label used to sit.

CircularProgressIndicator(
    modifier = Modifier.size(18.dp),
    strokeWidth = 2.dp
)

Reset When Done

When the work finishes, set loading back to false. The label returns and the button becomes tappable again.

onResult = { loading = false }

States Prevent Mistakes

Together, enabled and loading guard your actions: no taps before input is valid, no duplicate taps while work is in flight.

Communicate, Don't Hide

Prefer disabling over hiding a button. A visible-but-disabled control teaches users the path to unlock it.

Quick Check

Your save action takes two seconds and users keep double-tapping it.

Recap: Stateful Buttons

You learned to reflect reality: enabled gates by validity, a loading flag shows progress and blocks repeats. Honest buttons, happy users. 🎯

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