我要评论内心想法xx
compose已经发布好久了，还没有用过compose写过ui，之前只是在官网上了解过，看着这可组合函数嵌套，我就脑袋大，更flutter一个德行，我的内心是抵触的，还是觉得用xml写香，抱着试一试的心态，打算用compose应用于实际项目中。(还是得多接触，多学习，真的是很香yyds)
无图无真相
上图，测试：通过滑动slider也是安卓称progressbar来改变速度
代码部分
@composable
fun speedcontent(){
//添加数字动画，避免速度变化过于突兀
var mytargetvalue by remember { mutablestateof(0) }
val progressint: int by animateintasstate(targetvalue = mytargetvalue)
column(modifier = modifier
.background(color = color.white)
.fillmaxsize(),
verticalarrangement = arrangement.bottom,
horizontalalignment = alignment.centerhorizontally) {
slider(value = mytargetvalue.tofloat(),
onvaluechange = {
mytargetvalue = it.toint() },
modifier = modifier.fillmaxwidth(),
valuerange = 0f..180f)
speedermeter(progressint)
}
}
具体实现
@optin(experimentaltextapi::class)
@composable
fun speedermeter(speednum: int,modifier: modifier = modifier
.width(220.dp)
.height(120.dp)
.background(color = color.white)){
val centerpointcolor = color.blue
val colorcenterpoint1 = color(0xff000000)
val colorcenterpoint2 = color(0xffee3e07)
val mersure = remembertextmeasurer()
fun getpointx(centerx:float,angle:int,circlerdius:float,step:int):float{
val angles = (angle*step).todouble()
val angle = math.toradians(angles)
return centerx - cos(angle).tofloat()*(circlerdius)
}
fun getpointy(centery:float,angle:int,circlerdius:float,step:int):float{
val angles = (angle*step).todouble()
val angle = math.toradians(angles)
return centery- sin(angle).tofloat()*(circlerdius)
}
val myunit = "km/h"
val speedtextlist = array(7){(it*20).tostring()}
box(modifier,
contentalignment = alignment.bottomcenter
) {
canvas(modifier, ondraw = {
val centerx = size.width/2
val bottomy = size.height-50
val mycolorstops = arrayof(0.0f to color.white,1.0f to color.black)
//画指针底座
drawcircle(
brush = brush.radialgradient(colorstops = mycolorstops),
radius = 30f,
center = offset(centerx,bottomy+15.dp.value),
)
drawcircle(
color = color.white,
radius = 23f,
center = offset(centerx,bottomy+15.dp.value)
)
drawcircle(
color = color.red,
radius = 20f,
center = offset(centerx,bottomy+15.dp.value)
)
//画单位
drawtext(
textmeasurer = mersure,
text = myunit,
style = textstyle(color = color.black, fontsize = 12.sp, fontweight = fontweight(20), fontfamily = fontfamily.serif),
topleft = offset(centerx-50.dp.value,bottomy-90)
)
//画刻度
repeat(61){
val fontweights = if( it%5==0){
if(it%10==0){
7f
}else{
4f
}
}else{
2f
}
val lengths = if(it%5==0){
if(it%10==0){
25
}else{
22
}
}else{
20
}
drawline(
color = color.black,
start = offset(
getpointx(centerx,it,bottomy,3),
getpointy(centerx,it,bottomy,3)
),
end = offset(
getpointx(centerx,it,bottomy-lengths,3),
getpointy(centerx,it,bottomy-lengths,3)
),
strokewidth = fontweights,
cap = strokecap.round
)
}
//画数字
repeat(speedtextlist.size){
val mytopleft = offset(
getpointx(centerx,it,bottomy-70,30)-25.dp.value,
getpointy(bottomy,it,bottomy-70,30))
val colortype = if(it > 4){
color.red
}else{
color.black
}
drawtext(
textmeasurer = mersure,
text = speedtextlist[it],
topleft =mytopleft,
style = textstyle(colortype, fontsize = 11.sp, fontfamily = fontfamily.serif)
)
}
//画指针
drawline(
color = color.red,
start = offset(
getpointx(centerx,speednum,bottomy-30,1),
getpointy(centerx,speednum,bottomy-30,1)
),
end = offset(
getpointx(centerx,speednum,0f,1),
getpointy(centerx,speednum,0f,1)
),
strokewidth = 15f,
cap = strokecap.round
)
})
}
}
compose还是蛮香的，用了就回不去了<捂脸>，只是这个代码的可读性没有java的好。
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