Android jetpack 中的按钮长按监听器组合

Question

我有一个带按钮的 Android 可组合用户界面。如何跟踪按钮长按事件？我让它为“文本”长按工作，但对于按钮它不起作用。如果我将修饰符应用于按钮，则如下所示，它不起作用。

Text(
                        text = view.text,
                        fontSize = view.textFontSize.toInt().sp,
                        fontWeight = FontWeight(view.textFontWeight.toInt()),
                        color = Color(android.graphics.Color.parseColor(view.textColor)),
                        modifier = Modifier.clickable(onClick = {
                                println("Single Click")
                            }, onLongClick = {
                                println("Long Click")
                            }, onDoubleClick = {
                                println("Double Tap")
                     })
                ) 

Answer 1

combinedClickable您可以像下面这样使用：

Modifier
    .combinedClickable(
        onClick = { },
        onLongClick = { },
    )

警告：使用 Compose，1.0.1此方法被标记为，@ExperimentalFoundationApi因此此答案可能会在未来版本中过时。

Answer 2

也可以使用https://developer.android.com/jetpack/compose/gestures 。

例如：

 import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.foundation.gestures.detectTapGestures

 modifier = Modifier
           .weight(2f)
           .pointerInput(Unit){
               detectTapGestures(
                     onLongPress = {
                             // perform some action here..
                     }
               )
            }
                        

Answer 3

处理这个问题的最佳方法是自己推出Button。材质Button基本上就是 aSurface和 a Row。Modifier.clickable添加您自己的不起作用的原因是因为已经设置了。

因此，如果您想添加onLongPress等，您可以复制/粘贴默认实现并传入这些 lambda。

@Composable
@OptIn(ExperimentalMaterialApi::class, ExperimentalFoundationApi::class)
fun Button(
    onClick: () -> Unit,
    modifier: Modifier = Modifier,
    onLongClick: (() -> Unit)? = null,
    onDoubleClick: (() -> Unit)? = null,
    enabled: Boolean = true,
    interactionState: InteractionState = remember { InteractionState() },
    elevation: ButtonElevation? = ButtonDefaults.elevation(),
    shape: Shape = MaterialTheme.shapes.small,
    border: BorderStroke? = null,
    colors: ButtonColors = ButtonDefaults.buttonColors(),
    contentPadding: PaddingValues = ButtonDefaults.ContentPadding,
    content: @Composable RowScope.() -> Unit
) {
    val contentColor by colors.contentColor(enabled)
    Surface(
        shape = shape,
        color = colors.backgroundColor(enabled).value,
        contentColor = contentColor.copy(alpha = 1f),
        border = border,
        elevation = elevation?.elevation(enabled, interactionState)?.value ?: 0.dp,
        modifier = modifier.combinedClickable(
            onClick = onClick,
            onDoubleClick = onDoubleClick,
            onLongClick = onLongClick,
            enabled = enabled,
            role = Role.Button,
            interactionState = interactionState,
            indication = null
        )
    ) {
        Providers(LocalContentAlpha provides contentColor.alpha) {
            ProvideTextStyle(
                value = MaterialTheme.typography.button
            ) {
                Row(
                    Modifier
                        .defaultMinSizeConstraints(
                            minWidth = ButtonDefaults.MinWidth,
                            minHeight = ButtonDefaults.MinHeight
                        )
                        .indication(interactionState, rememberRipple())
                        .padding(contentPadding),
                    horizontalArrangement = Arrangement.Center,
                    verticalAlignment = Alignment.CenterVertically,
                    content = content
                )
            }
        }
    }
}

用法：

Button(
    onClick = {},
    onLongClick = {},
    onDoubleClick = {}
) {
    Text(text = "I'm a button")
}

Answer 4

根据文件

Modifier.pointerInput(Unit) {
        detectTapGestures(
            onPress = { /* Called when the gesture starts */ },
            onDoubleTap = { /* Called on Double Tap */ },
            onLongPress = { /* Called on Long Press */ },
            onTap = { /* Called on Tap */ }
        )
    }

Answer 5

由于某些原因，它不适用于Button，但您可以使用可Card组合项重新创建按钮并向其应用combinedClickable修饰符。

ElevatedCard(
    modifier = modifier
        .fillMaxHeight()
        .padding(4.dp)
        .clip(RoundedCornerShape(20.dp))
        .combinedClickable(
            interactionSource = remember {
                MutableInteractionSource()
            },
            indication = rememberRipple(bounded = true),
            onClick = onClick,
            onLongClick = onLongClick)
) {
    Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
        content()
    }
}