Jetpack Compose 2026 年 8 月版的最新动态

implementation(platform("androidx.compose:compose-bom:2026.08.00"))

val rows = 1
val columns = 1

val gradientPainter = remember {
    MeshGradientPainter(rows, columns) {
        // Parameters: row, column, position, color
        setVertex(0, 0, Offset(0f, 0f), Color.Red)     // Top-Left
        setVertex(0, 1, Offset(1f, 0f), Color.Blue)    // Top-Right
        setVertex(1, 0, Offset(0f, 1f), Color.Green)   // Bottom-Left
        setVertex(1, 1, Offset(1f, 1f), Color.Yellow)  // Bottom-Right
    }
}

Box(
    modifier = modifier
        .aspectRatio(16/9f)
        .fillMaxWidth()
        .paint(gradientPainter)
)

@Composable
fun AnalyticsTracker(userId: String, screenName: String) {
    SideEffect(key1 = userId, key2 = screenName) {
        analytics.logScreenView(userId, screenName)
    }
}

val state = remember { DeferredTransitionState(initialScreen) }
val transition = rememberDeferredTransition(state)

if (predictiveBackInProgress) {
    state.defer(targetScreen)
} else {
    state.animateTo(targetScreen)
}

transition.DeferredAnimatedContent(
    targetState = targetScreen,
    mutableTransformSpec = {
       MutableContentTransform {
           // Manually manipulate properties during the deferred phase
           initialContentTransform { scale = swipeProgress }
       }
    }
) { screen ->
    ScreenContent(screen)
}

val state = rememberTextFieldState("Formatted text in Compose 1.12")

// Apply bold and color styles to a range of text
state.edit {
    addStyle(
        SpanStyle(fontWeight = FontWeight.Bold, color = Color.Blue),
        start = 0,
        end = 9
    )
}

// Query active styles from TextFieldState
val currentStyles = state.textStyles

@Composable
fun ProgrammaticSelectionExample() {
    val selectionState = rememberSelectionState()

    Column {
        Button(
            onClick = { selectionState.selectAll() },
            modifier = Modifier.disableSelectionClearOnTap()
        ) {
            Text("Select All")
        }

        SelectionContainer(state = selectionState) {
            Text("Text content to be selected programmatically.")
        }
    }
}

@Composable
fun LoginField(textFieldState: TextFieldState) {
    val credentialData = remember {
        CredentialRequestData(
            // Specify Credential Manager request options
        )
    }

    BasicTextField(
        state = textFieldState,
        modifier = Modifier.semantics {
            credentialRequest = credentialData
        }
    )
}

@OptIn(ExperimentalGridApi::class)
@Composable
fun DashboardLayout() {
    Grid(
        config = {
            area("header", row = 0, column = 0, rowSpan = 1, columnSpan = 2)
            area("sidebar", row = 1, column = 0)
            area("content", row = 1, column = 1)
            gap(16.dp)
        }
    ) {
        HeaderSection(modifier = Modifier.gridItem(areaId = "header"))
        NavigationSidebar(modifier = Modifier.gridItem(areaId = "sidebar"))
        MainContentView(modifier = Modifier.gridItem(areaId = "content"))
    }
}

@Test
fun testAnimationStateFast() {

composeTestRule.mainClock.autoAdvance = false
    
    while (composeTestRule.hasPendingWork()) {
        composeTestRule.mainClock.advanceTimeByFrame()
        composeTestRule.waitForIdle()
        
        composeTestRule.runOnUiThread {
            composeTestRule.runWithoutImplicitWait {
                // This is most effective when querying multiple nodes in a single frame. 
                // It prevents the redundant synchronization overhead that would 
                // otherwise occur on every individual query.
                val box1 = composeTestRule.onNodeWithTag("Box1").fetchSemanticsNode()
                val box2 = composeTestRule.onNodeWithTag("Box2").fetchSemanticsNode()
                
                assertThat(box1.boundsInRoot.right).isAtMost(box2.boundsInRoot.left)
            }
        }
    }
}