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Android iOS-like progress
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import android.content.Context | |
import android.graphics.* | |
import android.graphics.drawable.Drawable | |
import android.os.Handler | |
import android.os.Looper | |
import android.util.DisplayMetrics | |
import androidx.annotation.ColorInt | |
import kotlin.math.PI | |
import kotlin.math.cos | |
import kotlin.math.roundToInt | |
import kotlin.math.sin | |
class ProgressDrawable( | |
private val context: Context, | |
sizeDp: Int = 24, | |
private val dashThicknessDp: Int = 2, | |
private val dashesCount: Int = 8, | |
private val tickTimeMillis: Long = 80, | |
) : Drawable() { | |
private val size = context.dp(sizeDp) | |
private var innerCircleRadius = 0f | |
private var circleRadius = 0f | |
private var shaderRadius = 0f | |
private var circleCenter = 0f | |
private var start = 0f | |
private var end = 0f | |
private var top = 0f | |
private var bottom = 0f | |
private val handler = Handler(Looper.getMainLooper()) | |
private val updateRunnable = UpdateRunnable() | |
private val angle = 360 / dashesCount | |
private var currentDegree = 0f | |
private var tick = 0 | |
@ColorInt | |
private var colorLight: Int = Color.WHITE | |
@ColorInt | |
private var colorDark: Int = Color.LTGRAY | |
private var paint = Paint(Paint.ANTI_ALIAS_FLAG).apply { | |
this.color = Color.WHITE | |
this.strokeWidth = context.dp(dashThicknessDp).toFloat() | |
this.strokeCap = Paint.Cap.ROUND | |
this.xfermode = PorterDuffXfermode(PorterDuff.Mode.SRC_IN) | |
} | |
init { | |
updateRunnable.run() | |
} | |
fun setColors(@ColorInt colorLight: Int, @ColorInt colorDark: Int) { | |
this.colorLight = colorLight | |
this.colorDark = colorDark | |
} | |
override fun setBounds(left: Int, top: Int, right: Int, bottom: Int) { | |
super.setBounds(left, top, right, bottom) | |
initSize(right) | |
} | |
override fun draw(canvas: Canvas) { | |
(0..dashesCount).forEach { | |
val radian = (it * angle / 180f * PI).toFloat() | |
canvas.drawLine( | |
circleCenter + circleRadius * cos(radian), | |
circleCenter + circleRadius * sin(radian), | |
circleCenter + innerCircleRadius * cos(radian), | |
circleCenter + innerCircleRadius * sin(radian), | |
paint | |
) | |
} | |
} | |
override fun setAlpha(alpha: Int) { | |
paint.alpha = alpha | |
} | |
@Deprecated(message = "use setColors instead") | |
override fun setColorFilter(colorFilter: ColorFilter?) { | |
invalidateSelf() | |
} | |
override fun getOpacity(): Int { | |
return PixelFormat.TRANSLUCENT | |
} | |
private fun initSize(width: Int) { | |
shaderRadius = (size / 2.0f) | |
innerCircleRadius = size / 6f | |
circleRadius = shaderRadius - innerCircleRadius | |
circleCenter = width / 2f | |
top = circleCenter - size / 2f | |
bottom = top + size | |
start = top | |
end = bottom | |
rotateShader(22f) | |
invalidateSelf() | |
} | |
private fun rotateShader(degree: Float) { | |
paint.shader = SweepGradient( | |
circleCenter, | |
circleCenter, | |
colorLight, | |
colorDark | |
).apply { | |
colorFilter | |
val gradientMatrix = Matrix() | |
gradientMatrix.preRotate(degree, circleCenter, circleCenter) | |
setLocalMatrix(gradientMatrix) | |
} | |
} | |
inner class UpdateRunnable : Runnable { | |
override fun run() { | |
currentDegree = (tick * angle).toFloat() | |
rotateShader(currentDegree + angle / 2f) | |
if (tick >= dashesCount) { | |
tick = 0 | |
} | |
tick++ | |
invalidateSelf() | |
handler.postDelayed(updateRunnable, tickTimeMillis) | |
} | |
} | |
} | |
fun Context.dp(dp: Int): Int { | |
return dp(dp.toFloat()) | |
} | |
fun Context.dp(dp: Float): Int { | |
val metrics = resources.displayMetrics | |
return (dp * (metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT.toFloat())).roundToInt() | |
} |
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