圆弧是以全圆来绘制的

app/src/main/java/com/zxhy/hfilemanagermaster/manager/ManagerFragment.kt

@@ -42,9 +42,12 @@ class ManagerFragment : Fragment() {
 
         val disk = requireContext().getMountInfoList().first()
         binding.tvFree.text = disk.getTotalContent(requireContext())
-        val percent = BigDecimal(disk.used)
-                .divide(BigDecimal(disk.total), 2, BigDecimal.ROUND_HALF_UP).multiply(BigDecimal(100)).toInt()
+        val percentF = BigDecimal(disk.used)
+            .divide(BigDecimal(disk.total), 2, BigDecimal.ROUND_HALF_UP)
 
+//        binding.indicatorView.setPercent(percentF.toFloat())
+        binding.indicatorView.setPercent(0.3f)
+        val percent = percentF.multiply(BigDecimal(100)).toInt()
         binding.tvUse.text = "$percent%"
 
         (requireActivity() as OverviewActivity).showManager()

app/src/main/java/com/zxhy/hfilemanagermaster/widget/IndicatorView.kt

@@ -5,26 +5,31 @@ import android.content.Context
 import android.graphics.Bitmap
 import android.graphics.BitmapFactory
 import android.graphics.Canvas
+import android.graphics.Matrix
 import android.graphics.Paint
-import android.graphics.Rect
 import android.graphics.RectF
 import android.util.AttributeSet
 import android.util.Log
 import android.view.View
 import androidx.core.content.ContextCompat
 import com.example.hfilemanagermaster.R
+import com.zxhy.hfilemanagermaster.knife.setImageSize
 import java.math.BigDecimal
 import java.math.RoundingMode
 import kotlin.math.min
 
 class IndicatorView : View {
 
-    private lateinit var bgBitmap: Bitmap
-    private var scale = 1f//背景图像缩放比例
-    private var strokeWidth = 1f//圆弧线宽
-    private var radius = 50f//圆弧半径(外圆弧)
-    private var hMargin = 50f//圆弧水平间距
+    private var strokeWidth = 40f//圆弧线宽
+    private var radius = 425f//圆弧半径(外圆弧)
+    private var hMargin = 75f//圆弧水平间距
     private var topMargin = 50f//圆弧顶部距离
+    private var sweepAngle = 0f
+
+    private lateinit var bgBitmap: Bitmap
+    private var scale = 1f//指针图像缩放比例
+
+    private var rotationDegrees = 0f // 旋转的角度
 
 
     // 画原始刻度的画笔
@@ -47,21 +52,23 @@ class IndicatorView : View {
     }
 
     private fun setResource() {
-        bgBitmap = BitmapFactory.decodeResource(context.resources, R.mipmap.ee_98985)
+
+        bgBitmap = BitmapFactory.decodeResource(context.resources, R.mipmap.dad_58978)
 
         arcPaint.strokeWidth = strokeWidth
         arcPaint.color = ContextCompat.getColor(context, R.color.color_DCFE86)
         arcPaint.isAntiAlias = true
         arcPaint.style = Paint.Style.STROKE
+        arcPaint.strokeCap = Paint.Cap.ROUND
     }
 
     @SuppressLint("DrawAllocation")
     override fun onLayout(changed: Boolean, left: Int, top: Int, right: Int, bottom: Int) {
         super.onLayout(changed, left, top, right, bottom)
+
         scale = BigDecimal(measuredWidth).divide(
             BigDecimal(bgBitmap.width), 3, RoundingMode.HALF_UP
         ).toFloat()
-
     }
 
     override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
@@ -83,25 +90,30 @@ class IndicatorView : View {
     override fun onDraw(canvas: Canvas) {
         super.onDraw(canvas)
 
-        //绘制背景图片
-        val srcRect = Rect(0, 0, measuredWidth, measuredHeight)
-        val dstRect = Rect(0, 0, measuredWidth, measuredHeight)
-//        canvas.drawBitmap(bgBitmap.setImageSize(scale), srcRect, dstRect, Paint())
 
         Log.e("IndicatorView", "radius=$radius")
-        val left = hMargin
-        val top = topMargin
-        val right = hMargin + radius * 2
-        val bottom = hMargin + radius * 2
+        val left = hMargin + strokeWidth / 2
+        val top = topMargin + strokeWidth / 2
+        val right = radius * 2 + left
+        val bottom = radius * 2 + top
 
         Log.e("IndicatorView", "left=$left top=$top right=$right bottom=$bottom")
         //绘制半圆
         val arcRect = RectF(left, top, right, bottom)
+        canvas.drawArc(arcRect, -180f, sweepAngle, false, arcPaint)
+
+
+        canvas.translate((measuredWidth / 2).toFloat() + 50, measuredHeight - 250f)
+        // 绘制旋转后的图片
+//        val srcRect = Rect(0, 0, 100, 100)
+//        val dstRect = Rect(0, 0, 100, 100)
+        //绘制指针
+    }
 
-//            RectF(0f, 0f, 100f,100f)
-//            val w=measuredWidth.toFloat()
-//            val h=measuredHeight.toFloat()
-//        Log.e("arcRect","W=$w h=$h")
-        canvas.drawArc(arcRect, 0f, -180f, false, arcPaint)
+    //绘制百分比
+    fun setPercent(percent: Float) {
+        sweepAngle = 180f * percent
+        rotationDegrees = 180f * percent-80f
+        invalidate()
     }
 }
\ No newline at end of file

app/src/main/res/layout/fragment_manager.xml

@@ -63,10 +63,10 @@
             app:layout_constraintTop_toBottomOf="@+id/tv_r" />
 
         <com.zxhy.hfilemanagermaster.widget.IndicatorView
-            android:layout_width="0dp"
-            android:background="#FF5F4A"
-            android:layout_marginBottom="-10dp"
+            android:id="@+id/indicatorView"
+            android:layout_width="350dp"
             android:layout_height="159dp"
+            android:background="@mipmap/ee_98985"
             android:layout_marginHorizontal="20dp"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintLeft_toLeftOf="parent"