如何在点击时更改按钮背景颜色？

Question

如何更改点击按钮的背景颜色？

Answer 1

如果您只想在按下

Button

时更改背景颜色，您可以使用

MutableInteractionSource

和

collectIsPressedAsState()

属性。

类似：

val interactionSource = remember { MutableInteractionSource() }
val isPressed by interactionSource.collectIsPressedAsState()

// Use the state to change the background color
val color = if (isPressed) Color.Blue else Color.Yellow

Column() {
    Button(
        onClick = {},
        interactionSource = interactionSource,
        colors= ButtonDefaults.buttonColors(backgroundColor = color)
    ){
        Text(
         "Button"
        )
    }
}

如果你想实现切换按钮，你可以使用类似的东西：

var selected by remember { mutableStateOf(false) }
val color = if (selected) Color.Blue else Color.Yellow

Button(
    onClick = { selected = !selected },
    colors= ButtonDefaults.buttonColors(backgroundColor = color)
    ){
        Text("Button")
}

Answer 2

您可以使用 1.0.0-alpha11 这样做

@Composable
fun ButtonColor() {

    val selected = remember { mutableStateOf(false) }

    Button(colors = ButtonDefaults.buttonColors(
            backgroundColor = if (selected.value) Color.Blue else Color.Gray),

            onClick = { selected.value = !selected.value }) {

    }
}

对于松开按钮时颜色变回原样的情况，请尝试以下操作：

@Composable
fun ButtonColor() {

    val color = remember { mutableStateOf(Color.Blue) }

    Button(
        colors = ButtonDefaults.buttonColors(
            backgroundColor = color.value
        ),

        onClick = {},

        content = {},

        modifier = Modifier.pointerInteropFilter {
            when (it.action) {
                MotionEvent.ACTION_DOWN -> {
                    color.value = Color.Yellow }

                MotionEvent.ACTION_UP  -> {
                    color.value = Color.Blue }
            }
            true
        }
    )
}

Answer 3

在jetpack compose中，这样的效果应该通过使用interactionResource来实现，这是一个简单的例子。

@Composable
fun MyButton(){
val interactionSource = remember { MutableInteractionSource() }
val isPressed by interactionSource.collectIsPressedAsState()
val bgcolor = if (isPressed) Color.Red else Color.White
val borderColor = if (isPressed) Color.White else Color.Red

OutlinedButton(
    onClick = {
    }, modifier = Modifier
        .fillMaxWidth()
        .height(40.dp),
    shape = RoundedCornerShape(8.dp),
    border = BorderStroke(1.dp, borderColor),
    interactionSource = interactionSource,
    colors = ButtonDefaults.outlinedButtonColors(backgroundColor = bgcolor)
) {
    Text(text = "button", color=borderColor)
}

}