Android自定义电池组件实例代码(BatteryView)

<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="batteryview">
<attr name="bv_level" format="integer"/>
<attr name="bv_showpercentage" format="boolean"/>
<attr name="bv_charging" format="boolean"/>
<attr name="bv_fastcharging" format="boolean"/>

<attr name="bv_bordercolor" format="color"/>
<attr name="bv_trackcolor" format="color"/>
<attr name="bv_fillcolor" format="color"/>
<attr name="bv_lowcolor" format="color"/>
<attr name="bv_mediumcolor" format="color"/>
<attr name="bv_highcolor" format="color"/>
<attr name="bv_boltcolor" format="color"/>

<attr name="bv_borderwidth" format="dimension"/>
<attr name="bv_cornerradius" format="dimension"/>
<attr name="bv_capwidth" format="dimension"/>
<attr name="bv_capgap" format="dimension"/>
<attr name="bv_textsize" format="dimension"/>
</declare-styleable>
</resources>

package com.yourpkg.widget
val y6 = t + h * 0.35f

boltpath.reset()
boltpath.moveto(x1, y1)
boltpath.lineto(x2, y2)
boltpath.lineto(x3, y3)
boltpath.lineto(x4, y4)
boltpath.lineto(x5, y5)
boltpath.lineto(x6, y6)
boltpath.close()
}
// endregion

// region — accessibility
private fun updatecontentdesc() {
val charge = when {
fastcharging -> "（快充中）"
charging -> "（充电中）"
else -> ""
}
contentdescription = "电量 $level%$charge"
}
// endregion

// region — state
override fun onsaveinstancestate(): parcelable? {
val superstate = super.onsaveinstancestate()
return savedstate(superstate).also {
it.level = level
it.charging = charging
it.fastcharging = fastcharging
it.showpercentage = showpercentage
it.chargepulse = chargepulse
}
}

override fun onrestoreinstancestate(state: parcelable?) {
val ss = state as? savedstate
super.onrestoreinstancestate(ss?.superstate ?: state)
ss?.let {
level = it.level
charging = it.charging
fastcharging = it.fastcharging
showpercentage = it.showpercentage
chargepulse = it.chargepulse
togglechargeanim(charging)
}
}

private class savedstate : basesavedstate {
var level: int = 0
var charging: boolean = false
var fastcharging: boolean = false
var showpercentage: boolean = false
var chargepulse: float = 0f

constructor(superstate: parcelable?) : super(superstate)
private constructor(inparcel: parcel) : super(inparcel) {
level = inparcel.readint()
charging = inparcel.readint() == 1
fastcharging = inparcel.readint() == 1
showpercentage = inparcel.readint() == 1
chargepulse = inparcel.readfloat()
}
override fun writetoparcel(out: parcel, flags: int) {
super.writetoparcel(out, flags)
out.writeint(level)
out.writeint(if (charging) 1 else 0)
out.writeint(if (fastcharging) 1 else 0)
out.writeint(if (showpercentage) 1 else 0)
out.writefloat(chargepulse)
}
companion object {
@jvmfield val creator: parcelable.creator<savedstate> = object : parcelable.creator<savedstate> {
override fun createfromparcel(source: parcel): savedstate = savedstate(source)
override fun newarray(size: int): array<savedstate?> = arrayofnulls(size)
}
}
}
// endregion

// region — utils
private fun dp(v: float) = v * resources.displaymetrics.density
private fun sp(v: float) = v * resources.displaymetrics.scaleddensity
// endregion
}

<com.yourpkg.widget.batteryview
android:id="@+id/battery"
android:layout_width="120dp"
android:layout_height="40dp"
android:layout_margin="16dp"
app:bv_level="45"
app:bv_showpercentage="true"
app:bv_charging="true"
app:bv_fastcharging="false"

app:bv_bordercolor="#222222"
app:bv_trackcolor="#f2f2f2"
app:bv_lowcolor="#e53935"
app:bv_mediumcolor="#fb8c00"
app:bv_highcolor="#43a047"
app:bv_boltcolor="#ffffff"

app:bv_borderwidth="2dp"
app:bv_cornerradius="8dp"
app:bv_capwidth="7dp"
app:bv_capgap="2dp"
app:bv_textsize="12sp"/>

val bv = findviewbyid<batteryview>(r.id.battery)

// 动态设置电量
bv.level = 18 // 立即刷新
bv.setlevelanimated(76) // 平滑动画到 76%

// 充电状态
bv.charging = true // 显示闪电 + 呼吸动画
bv.fastcharging = true // 闪电更大、视觉更强

// 开关百分比
bv.showpercentage = false

// 结合业务：阈值配色自动处理（<20 红、<50 橙、≥50 绿），无需额外代码