Android circular progress bar with rounded corners

问题

I am trying to get a circular progress bar with rounded corner as shown below.

But I am not able to get the rounded corner so far I am able to get the circular progress bar.

I am trying to draw it using the xml drawable.

 <ProgressBar
                android:id="@+id/onboarding_activity_progress_bar"
                android:layout_gravity="center"
                android:padding="10dp"
                android:layout_width="120dp"
                android:layout_height="120dp"
                style="?android:attr/progressBarStyleHorizontal"
                android:progressDrawable="@drawable/progressbar_onboarding_view"
                tools:progress="60"/>

Progressbar_onboarding_view.xml

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@android:id/background">
        <shape android:useLevel="false"
               android:innerRadiusRatio="2.0"
               android:shape="ring"
               android:thickness="10dp">
            <solid android:color="@color/progress_bar_background_color" />
            <corners android:radius="50dp"/>
        </shape>
    </item>
    <item android:id="@android:id/progress">
        <shape
              xmlns:android="http://schemas.android.com/apk/res/android"
              android:useLevel="true"
              android:innerRadiusRatio="2.0"
              android:shape="ring"
              android:thickness="10dp">
            <solid android:color="@color/progress_bar_color" />
        </shape>
        <!--
        <scale
              android:drawable="@drawable/progressbar_round_corner"
              android:scaleWidth="98%" /> -->
    </item>
</layer-list>

progressbar_rounded_corner.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >

   <corners
         android:radius="10dp"/>

   <solid android:color="@android:color/white" />

   <stroke
         android:width="1dp"
         android:color="@android:color/holo_red_dark" />

</shape>

I tried using scale parameter but the progress corner didn't change. I am not sure how to achieve the rounded corner. Please help I would really appreciate it.

回答1:

A simple and efficient class extending View to draw circular progress, with rounded corners as an option. Progress color, background color, stroke width are also customizable.

import android.content.Context
import android.graphics.Canvas
import android.graphics.Paint
import android.graphics.RectF
import android.util.AttributeSet
import android.view.View
import androidx.annotation.FloatRange

class CircularProgressView : View {
  constructor(context: Context) : super(context)
  constructor(context: Context, attrs: AttributeSet?) : super(context, attrs)
  constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr)

  private val progressPaint: Paint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
    style = Paint.Style.STROKE
  }
  private val backgroundPaint: Paint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
    style = Paint.Style.STROKE
  }

  private val rect = RectF()
  private val startAngle = -90f
  private val maxAngle = 360f
  private val maxProgress = 100

  private var diameter = 0f
  private var angle = 0f

  override fun onDraw(canvas: Canvas) {
    drawCircle(maxAngle, canvas, backgroundPaint)
    drawCircle(angle, canvas, progressPaint)
  }

  override fun onSizeChanged(width: Int, height: Int, oldWidth: Int, oldHeight: Int) {
    diameter = Math.min(width, height).toFloat()
    updateRect()
  }

  private fun updateRect() {
    val strokeWidth = backgroundPaint.strokeWidth
    rect.set(strokeWidth, strokeWidth, diameter - strokeWidth, diameter - strokeWidth)
  }

  private fun drawCircle(angle: Float, canvas: Canvas, paint: Paint) {
    canvas.drawArc(rect, startAngle, angle, false, paint)
  }

  private fun calculateAngle(progress: Float) = maxAngle / maxProgress * progress

  fun setProgress(@FloatRange(from = 0.0, to = 100.0) progress: Float) {
    angle = calculateAngle(progress)
    invalidate()
  }

  fun setProgressColor(color: Int) {
    progressPaint.color = color
    invalidate()
  }

  fun setProgressBackgroundColor(color: Int) {
    backgroundPaint.color = color
    invalidate()
  }

  fun setProgressWidth(width: Float) {
    progressPaint.strokeWidth = width
    backgroundPaint.strokeWidth = width
    updateRect()
    invalidate()
  }

  fun setRounded(rounded: Boolean) {
    progressPaint.strokeCap = if (rounded) Paint.Cap.ROUND else Paint.Cap.BUTT
    invalidate()
  }
}

回答2:

I know this is an old question. But here is a solution which might be helpful to someone else.

This library can be used to achieve this.

Simply add this to your Gradel File

compile 'pl.pawelkleczkowski.customgauge:CustomGauge:1.0.3'

And then add this to you XML Layout

   <pl.pawelkleczkowski.customgauge.CustomGauge
        android:id="@+id/gauge2"
        android:layout_width="140dp"
        android:layout_height="140dp"
        android:layout_centerHorizontal="true"
        android:paddingBottom="10dp"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:paddingTop="10dp"
        app:gaugeEndValue="100"
        app:gaugePointEndColor="@color/md_blue_800"
        app:gaugePointStartColor="@color/md_blue_300"
        app:gaugeStartAngle="180"
        app:gaugeStartValue="0"
        app:gaugeStrokeCap="ROUND"
        app:gaugeStrokeColor="@color/md_grey_400"
        app:gaugeStrokeWidth="10dp"
        app:gaugeSweepAngle="360" />

And this is how you can set the progress of the bar

private CustomGauge gauge;// Declare this variable in your activity

gauge = findViewById(R.id.gauge2);//And this on you OnCreate method

gauge.setValue(progress);// Set the progress like this.

The library is Opensource and is available to use under the General Public License, version 2

来源：https://stackoverflow.com/questions/36639660/android-circular-progress-bar-with-rounded-corners