android Compose 自定义滑动进度条
androidx.compose.material3 我用1.2.0版本的Slider非常好用，但是升级到1.3.2后滑轨后面多了个点，滑块背景也移除不掉而且默认透明了我暂时没有找到让他不透明。所以自定义了一个先用着。
@Composable
fun CustomSlider(
state: CustomSliderState,
modifier: Modifier = Modifier,
trackHeight: Dp = 4.dp,
thumbSize: Dp = 24.dp,
trackColor: Color = Color.Gray,
progressColor: Color = Color.Blue,
thumbColor: Color = Color.White,
onValueChange: ((Float) -> Unit)? = null,
onValueChangeFinished: ((Float) -> Unit)? = null
) {
var sliderWidth by remember { mutableFloatStateOf(0f) }
Box(
modifier = modifier
.height(thumbSize + 16.dp) // 确保足够高度容纳滑块
.pointerInput(Unit) {
awaitEachGesture {
http://www.devze.com val event = awaitPointerEvent(PointerEventPass.Initial)
if (event.changes.firstOrNull()?.changedToDown() == true) {
val down = awaitFirstDown(requireUnconsumed = true)
state.setPressed(true)
val newposition = (event.changes.first().position.x / sliderWidth).coerceIn(0f, 1f)
val newValue = state.range.start + newPosition * (state.range.endInclusive - state.range.start)
state.updateValue(newValue)
onValueChange?.invoke(state.value)
var drag: PointerInputChange?
do {
drag = awaitTouchSlopOrCancellation(down.id) { change, _ ->
if (change.positionChange() != Offset.Zero) change.consume()
}
} while (drag != null && !drag.isConsumed)
if (drag != null) {
val dragResult = drag(drag.id) {编程
val newPosition = (it.position.x / sliderWidth).coerceIn(0f, 1f)
val newValue = state.range.start + newPosition * (state.range.endInclusive - state.range.start)
state.updateValue(newValue)
onValueChange?.invoke(state.value)
}
// 确保完成回调被触发
if (!dragResult || drag.isConsumed) {
onValueChangeFinished?.invoke(state.value)
}
} else {
onValueChangeFinished?.invoke(state.value)
}
}
}
},
contentAlignment = Alignment.CenterStart
) {
// 绘制轨道（Track）
Canvas(
modifier = Modifier
.fillMaxWidth()
.clip(CircleShape)
.height(trackHeight)
.align(Alignment.CenterStart)
.onSizeChanged { size ->
sliderWidth = size.width.toFloat()
}
) {
// 背景轨道
drawRect(
color = trackColor,
size = Size(size.width.toFloat(), trackHeight.toPx())
)
// 进度轨道
drawRect(
color = progressColor,
size = Size(
width = (state.value - state.range.start) / (state.range.endInclusive - state.range.start) * size.width,
height = trackHeight.toPx()
)
)
}
// 滑块（Thumb）根据你自己需求替换
Box(
modifier = Modifier
.offset {
IntOffset(
x = ((state.value - state.range.start) / (state.range.endInclusive - state.range.start) * sliderWidth - thumbSize.toPx()/2).toInt(),
y = 0
)
}
.shadow(4.dp, CircleShape)
.size(thumbSize)
.background(thumbColor, CircleShape)
)
}
}
class CustomSliderState(
initialValue: Float,
interwww.devze.comnal val range: ClosedFloatingPointRange<Float> = 0f..1f
) {
private val _value = mutableFloatStateOf(initialValue.coerceIn(range))
private val _isPressed = mutableStateOf(false) // 新增按下状态
val value: Float
get() = _value.floatValue
val isPressed: Boolean // 暴露给外部
get() = _isPressed.value
fun updateValue(newValue: Float) {
_value.floatValue = newValue.coerceIn(range)
}
fun setPressed(pressed: Boolean) { // 更新按下状态
_isPressed.value = pressed
}
}
@Composable
fun rememberCustomSliderState(
initialValue: Float = 0f,
range: ClosedFloatingPointRange<Float> = 0f..1f
): CustomSliderState {
return remember { CustomSliderState(initialValue, range) }
}
使用
val sliderState = rememberCustomSliderState(
initialValue = 0.5f,
range = 0f..100f
)
CustomSlider(
state = sliderState,
modifier = Modifier.fillMaxWidth().padding(horizontal = 36.dp),
trackHeight = 12.dp,
thumbSize = 24.dp,
trackColor = Color.LightGray,
progressColor = Color(0xFF6200EE),
thumbColor = Color.White,
onValueChange = {
Log.e("onValueChange","float---$it")
},
onValueChangeFinished = {
Log.e("onValueChangeFinished","float---$it")
}
)
补充：Compose笔记(十五)--进度条
这一节了解一下Compose中的进度条，有两种类型的进度条可供使用，分别是线性进度条（LinearProgressIndicator）和圆形进度条（CircularProgressIndicator），每种进度条又可分为确定模式和不确定模式。
1. 不确定模式
在不确定模式下，进度条会持续滚动，用于表示操作正在进行，但无法确定具体的完成进度。2. 确定模式在确定模式下，需要传入 progress 参数，该参数的值范围是 0 到 1，表示操作的完成进度。栗子:
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.CircularProgressIndicator
import androidx.compose.material3.LinearProgressIndicator
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
@Composable
fun ProgressBarsExample() {
Column(
modifier = Modifier.padding(top = 40.dp),
verticalArrangement = Arrangement.spacedBy(16.dp)
) {
// 不确定线性进度条
IndeterminateLinearProgressBar()
// 确定线性进度条
DeterminateLinearProgressBar()
// 不确定圆形进度条
IndeterminateCirculhttp://www.devze.comarProgressBar()
// 确定圆形进度条
DeterminateCircularProgressBar()
// 自定义进度条样式
CircularProgressBarExample()
}
}
@Composable
fun IndeterminateLinearProgressBar() {
LinearProgressIndicator()
}
@Composable
fun DeterminateLinearProgressBar() {
var progress by remember { mutableStateOf(0.5f)}
LinearProgressIndicator(
progress = progress
)
}
@Composable
fun IndeterminateCircularProgressBar() {
CircularProgressIndicator()
}
@Composable
fun DeterminateCircularProgressBar() {
var progress by remember { mutableStateOf(0.7f)}
CircularProgressIndicator(
progress = progress
)
}
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.material3.Button
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
@Composable
fun CircularProgressBarExample() {
var progress by remember { mutableStateOf(0.2f) }
Column(
modifier = Modifier.size(400.dp).padding(top = 20.dp),
horizontalAlignment = Alignment.CenterHorizontally
) {
CircularProgressBar(
progress = progress,
modifier = Modifier.size(150.dp),
indicatorStrokeWidth = 4.dp,
backgroundCircleColor = if(progress in 0.0..0.2) Color.Yellow
else if(progress>0.2 && progress<=0.5)
Color.Red
else if(progress>0.5 && progress<0.8)
Color.Blue
else Color.White,
fontSize = 12.sp
)
Button(
modifier = Modifier.padding(top = 20.dp),
onClick = {
progress = if (progress < 1f) progress + 0.1f else 0f
}
) {
Text(text = "进度测试")
}
}
}
import androidx.compose.foundation.Canvas
import androidx.compose.foundation.layout.Box
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.StrokeCap
import androidx.compose.ui.graphics.drawscope.DrawScope
import androidx.compose.ui.graphics.drawscope.Stroke
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unihttp://www.devze.comt.TextUnit
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
@Composable
fun CircularProgressBar(
progress: Float,
modifier: Modifier = Modifier,
backgroundIndicatorColor: Color = Color.LightGray,
indicatorColor: Color = Color.Blue,
indicatorStrokeWidth: Dp = 10.dp,
backgroundCircleColor: Color = Color.White,
textColor: Color = Color.Black,
fontSize: TextUnit = 20.sp
) {
Box(
modifier = modifier,
contentAlignment = Alignment.Center
) {
Canvas(modifier = modifier) {
drawBackgroundCircle(backgroundCircleColor)
drawBackgroundIndicator(backgroundIndicatorColor, indicatorStrokeWidth)
drawProgressIndicator(progress, indicatorColor, indicatorStrokeWidth)
}
Text(
text = "${(progress * 100).toInt()}%",
color = textColor,
fontSize = fontSize,
fontWeight = FontWeight.Bold
)
}
}
private fun DrawScope.drawBackgroundCircle(color: Color) {
drawCircle(
color = color,
radius = size.minDimension / 2
)
}
private fun DrawScope.drawBackgroundIndicator(
color: Color,
strokeWidth: Dp
) {
drawArc(
color = color,
startAngle = -90f,
sweepAngle = 360f,
useCenter = false,
style = Stroke(
width = strokeWidth.toPx(),
cap = StrokeCap.Round
),
size = Size(size.width, size.height)
)
}
private fun DrawScope.drawProgressIndicator(
progress: Float,
color: Color,
strokeWidth: Dp
) {
drawArc(
color = color,
startAngle = -90f,
sweepAngle = 360f * progress,
useCenter = false,
style = Stroke(
width = strokeWidth.toPx(),
cap = StrokeCap.Round
),
size = Size(size.width, size.height)
)
}
如图:
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