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Android Compose 自定义滑动进度条的实现代码

开发者 https://www.devze.com 2025-06-20 12:36 出处:网络 作者: 小铁-Android
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

android Compose 自定义滑动进度条

Android Compose 自定义滑动进度条的实现代码

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:

Android Compose 自定义滑动进度条的实现代码

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