刷新Compose列表的非凡指南：释放创新的视觉体验

Android

2023-03-20 14:45:11

Compose列表刷新自定义动画：赋予您的应用生命力

计算滑动Touch事件

开启您的Compose列表刷新自定义动画之旅，从计算滑动的Touch事件开始。GestureDetector.onGesture事件监听器将成为您的帮手，它能识别触摸、拖动、缩放和点击等各种手势。

捕捉滑动距离

滑动手势出现后，捕捉滑动距离是关键。记录滑动起点和终点之间的距离，这将决定动画的幅度和节奏。

绘制下拉背景动画

Canvas.drawCircle()方法将绘制一个圆形背景，它将随着滑动距离而变化，赋予动画以动感。

创造令人兴奋的动画效果

发挥您的想象力，创造出各种引人入胜的动画效果。TweenAnimationBuilder和AnimatedVisibility等类将成为您的得力助手，它们可实现平移、缩放、旋转、淡入淡出等效果。

定制您的动画效果

您可以根据个人喜好和应用风格自定义动画效果，彰显您的品牌特色。通过调整动画持续时间、颜色和形状，打造独一无二的视觉体验。

代码示例：

import androidx.compose.animation.core.tween
import androidx.compose.foundation.gestures.detectTapGestures
import androidx.compose.foundation.gestures.detectVerticalDragGestures
import androidx.compose.foundation.gestures.rememberTransformableState
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.size
import androidx.compose.material.FloatingActionButton
import androidx.compose.material.Icon
import androidx.compose.material.Text
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.ArrowDownward
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.geometry.Offset
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.drawscope.drawCircle
import androidx.compose.ui.input.pointer.pointerInput
import androidx.compose.ui.unit.dp

@Composable
fun CustomRefreshAnimation() {
    var refreshState by remember { mutableStateOf(false) }
    val transformableState = rememberTransformableState { zoomChange, offsetChange, rotationChange ->
        if (refreshState) {
            offsetChange
        } else {
            Offset.Zero
        }
    }

    Box(
        modifier = Modifier
            .fillMaxSize()
            .pointerInput(Unit) {
                detectVerticalDragGestures(
                    onDragEnd = {
                        refreshState = true
                    }
                )
            }
    ) {
        Text(
            "下拉刷新",
            modifier = Modifier
                .align(Alignment.Center)
                .transformable(transformableState)
        )
        if (refreshState) {
            FloatingActionButton(
                backgroundColor = Color.Blue,
                modifier = Modifier.align(Alignment.BottomEnd),
                onClick = {
                    refreshState = false
                }
            ) {
                Icon(imageVector = Icons.Filled.ArrowDownward, contentDescription = "Refresh")
            }
        }
    }
}