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