//1.畫圓環//原點坐標float circleX = width / 2;float circleY = width / 2;//半徑float radius = width / 2 - roundWidth / 2;//設置畫筆的屬性paint.setColor(roundColor);paint.setStrokeWidth(roundWidth);paint.setStyle(Paint.Style.STROKE);canvas.drawCircle(circleX, circleY, radius, paint);//2.畫圓弧RectF oval = new RectF(roundWidth/2,roundWidth/2,width-roundWidth/2,width - roundWidth/2);paint.setColor(roundProgressColor);canvas.drawArc(oval, 0, progress * 360 / max, false, paint);//3.畫文本paint.setTextSize(textSize);paint.setColor(textColor);paint.setStrokeWidth(0);String text = progress * 100 / max + "%";Rect bounds = new Rect();paint.getTextBounds(text, 0, text.length(), bounds);canvas.drawText(text, width / 2 - bounds.width() / 2, width / 2 + bounds.height() / 2, paint);

<declare-styleable name="RoundProgress"> <attr name="roundColor" format="color"></attr> <attr name="roundProgressColor" format="color"></attr> <attr name="textColor" format="color"></attr> <attr name="roundWidth" format="dimension"></attr> <attr name="textSize" format="dimension"></attr></declare-styleable>

xmlns:atguigu=http://schemas.android.com/apk/res-auto

<com.atguigu.p2p.util.RoundProgress  android:id="@+id/rp_home_progress"  android:layout_width="120dp"  android:layout_height="120dp"  android:layout_gravity="center_horizontal"  android:layout_marginTop="20dp"  atguigu:roundColor="@android:color/darker_gray         <br>  atguigu:roundProgressColor="@android:color/holo_red_dark"  atguigu:textColor="@color/text_progress"  atguigu:roundWidth="10dp"  atguigu:textSize="20sp"  /> 

//1.得到所有自定義屬性的數組TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.RoundProgress);//2.獲取自定義屬性的值, 如果沒有指定取默認值roundColor = typedArray.getColor(R.styleable.RoundProgress_roundColor, Color.RED);roundProgressColor = typedArray.getColor(R.styleable.RoundProgress_roundProgressColor, Color.GREEN);textColor = typedArray.getColor(R.styleable.RoundProgress_textColor, Color.GREEN);roundWidth = typedArray.getDimension(R.styleable.RoundProgress_roundWidth, UIUtils.dp2px(10));textSize = typedArray.getDimension(R.styleable.RoundProgress_textSize, UIUtils.dp2px(20));//3.釋放資源數據typedArray.recycle();