public class CircleProgressView extends ProgressBar {

    private int mReachBarSize = DisplayUtil.dip2px(getContext(), 2); // 未完成進度條大小
    private int mNormalBarSize = DisplayUtil.dip2px(getContext(), 2); // 未完成進度條大小
    private int mReachBarColor = Color.parseColor("#108ee9"); // 已完成進度顏色
    private int mNormalBarColor = Color.parseColor("#FFD3D6DA"); // 未完成進度顏色
    private int mTextSize = DisplayUtil.sp2px(getContext(), 14); // 進度值字型大小
    private int mTextColor = Color.parseColor("#108ee9"); // 進度的值字型顏色
    private float mTextSkewX; // 進度值字型傾斜角度
    private String mTextSuffix = "%"; // 進度值字首
    private String mTextPrefix = ""; // 進度值字尾
    private boolean mTextVisible = true; // 是否顯示進度值
    private boolean mReachCapRound; // 畫筆是否使用圓角邊界，normalStyle下生效
    private int mRadius = DisplayUtil.dip2px(getContext(), 20); // 半徑
    private int mStartArc; // 起始角度
    private int mInnerBackgroundColor; // 內部背景填充顏色
    private int mProgressStyle = ProgressStyle.NORMAL; // 進度風格
    private int mInnerPadding = DisplayUtil.dip2px(getContext(), 1); // 內部圓與外部圓間距
    private int mOuterColor; // 外部圓環顏色
    private boolean needDrawInnerBackground; // 是否需要繪製內部背景
    private RectF rectF; // 外部圓環繪製區域
    private RectF rectInner; // 內部圓環繪製區域
    private int mOuterSize = DisplayUtil.dip2px(getContext(), 1); // 外層圓環寬度
    private Paint mTextPaint; // 繪製進度值字型畫筆
    private Paint mNormalPaint; // 繪製未完成進度畫筆
    private Paint mReachPaint; // 繪製已完成進度畫筆
    private Paint mInnerBackgroundPaint; // 內部背景畫筆
    private Paint mOutPaint; // 外部圓環畫筆

    private int mRealWidth;
    private int mRealHeight;

    @IntDef({ProgressStyle.NORMAL, ProgressStyle.FILL_IN, ProgressStyle.FILL_IN_ARC})
    @Retention(RetentionPolicy.SOURCE)
    public @interface ProgressStyle {
        int NORMAL = 0;
        int FILL_IN = 1;
        int FILL_IN_ARC = 2;
    }

    public CircleProgressView(Context context) {
        this(context, null);
    }

    public CircleProgressView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public CircleProgressView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        obtainAttributes(attrs);
        initPaint();
    }

    private void initPaint() {
        mTextPaint = new Paint();
        mTextPaint.setColor(mTextColor);
        mTextPaint.setStyle(Paint.Style.FILL);
        mTextPaint.setTextSize(mTextSize);
        mTextPaint.setTextSkewX(mTextSkewX);
        mTextPaint.setAntiAlias(true);

        mNormalPaint = new Paint();
        mNormalPaint.setColor(mNormalBarColor);
        mNormalPaint.setStyle(mProgressStyle == ProgressStyle.FILL_IN_ARC ? Paint.Style.FILL : Paint.Style.STROKE);
        mNormalPaint.setAntiAlias(true);
        mNormalPaint.setStrokeWidth(mNormalBarSize);

        mReachPaint = new Paint();
        mReachPaint.setColor(mReachBarColor);
        mReachPaint.setStyle(mProgressStyle == ProgressStyle.FILL_IN_ARC ? Paint.Style.FILL : Paint.Style.STROKE);
        mReachPaint.setAntiAlias(true);
        mReachPaint.setStrokeCap(mReachCapRound ? Paint.Cap.ROUND : Paint.Cap.BUTT);
        mReachPaint.setStrokeWidth(mReachBarSize);

        if (needDrawInnerBackground) {
            mInnerBackgroundPaint = new Paint();
            mInnerBackgroundPaint.setStyle(Paint.Style.FILL);
            mInnerBackgroundPaint.setAntiAlias(true);
            mInnerBackgroundPaint.setColor(mInnerBackgroundColor);
        }
        if (mProgressStyle == ProgressStyle.FILL_IN_ARC) {
            mOutPaint = new Paint();
            mOutPaint.setStyle(Paint.Style.STROKE);
            mOutPaint.setColor(mOuterColor);
            mOutPaint.setStrokeWidth(mOuterSize);
            mOutPaint.setAntiAlias(true);
        }
    }

    private void obtainAttributes(AttributeSet attrs) {
        TypedArray ta = getContext().obtainStyledAttributes(attrs, R.styleable.CircleProgressView);
        mProgressStyle = ta.getInt(R.styleable.CircleProgressView_cpv_progressStyle, ProgressStyle.NORMAL);
        // 獲取三種風格通用的屬性
        mNormalBarSize = (int) ta.getDimension(R.styleable.CircleProgressView_cpv_progressNormalSize, mNormalBarSize);
        mNormalBarColor = ta.getColor(R.styleable.CircleProgressView_cpv_progressNormalColor, mNormalBarColor);

        mReachBarSize = (int) ta.getDimension(R.styleable.CircleProgressView_cpv_progressReachSize, mReachBarSize);
        mReachBarColor = ta.getColor(R.styleable.CircleProgressView_cpv_progressReachColor, mReachBarColor);

        mTextSize = (int) ta.getDimension(R.styleable.CircleProgressView_cpv_progressTextSize, mTextSize);
        mTextColor = ta.getColor(R.styleable.CircleProgressView_cpv_progressTextColor, mTextColor);
        mTextSkewX = ta.getDimension(R.styleable.CircleProgressView_cpv_progressTextSkewX, 0);
        if (ta.hasValue(R.styleable.CircleProgressView_cpv_progressTextSuffix)) {
            mTextSuffix = ta.getString(R.styleable.CircleProgressView_cpv_progressTextSuffix);
        }
        if (ta.hasValue(R.styleable.CircleProgressView_cpv_progressTextPrefix)) {
            mTextPrefix = ta.getString(R.styleable.CircleProgressView_cpv_progressTextPrefix);
        }
        mTextVisible = ta.getBoolean(R.styleable.CircleProgressView_cpv_progressTextVisible, mTextVisible);

        mRadius = (int) ta.getDimension(R.styleable.CircleProgressView_cpv_radius, mRadius);
        rectF = new RectF(-mRadius, -mRadius, mRadius, mRadius);

        switch (mProgressStyle) {
            case ProgressStyle.FILL_IN:
                mReachBarSize = 0;
                mNormalBarSize = 0;
                mOuterSize = 0;
                break;
            case ProgressStyle.FILL_IN_ARC:
                mStartArc = ta.getInt(R.styleable.CircleProgressView_cpv_progressStartArc, 0) + 270;
                mInnerPadding = (int) ta.getDimension(R.styleable.CircleProgressView_cpv_innerPadding, mInnerPadding);
                mOuterColor = ta.getColor(R.styleable.CircleProgressView_cpv_outerColor, mReachBarColor);
                mOuterSize = (int) ta.getDimension(R.styleable.CircleProgressView_cpv_outerSize, mOuterSize);
                mReachBarSize = 0;// 將畫筆大小重置為0
                mNormalBarSize = 0;
                if (!ta.hasValue(R.styleable.CircleProgressView_cpv_progressNormalColor)) {
                    mNormalBarColor = Color.TRANSPARENT;
                }
                int mInnerRadius = mRadius - mOuterSize / 2 - mInnerPadding;
                rectInner = new RectF(-mInnerRadius, -mInnerRadius, mInnerRadius, mInnerRadius);

                break;
            case ProgressStyle.NORMAL:
                mReachCapRound = ta.getBoolean(R.styleable.CircleProgressView_cpv_reachCapRound, true);
                mStartArc = ta.getInt(R.styleable.CircleProgressView_cpv_progressStartArc, 0) + 270;
                if (ta.hasValue(R.styleable.CircleProgressView_cpv_innerBackgroundColor)) {
                    mInnerBackgroundColor = ta.getColor(R.styleable.CircleProgressView_cpv_innerBackgroundColor, Color.argb(0, 0, 0, 0));
                    needDrawInnerBackground = true;
                }
                break;
        }
        ta.recycle();
    }

    @Override
    protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int maxBarPaintWidth = Math.max(mReachBarSize, mNormalBarSize);
        int maxPaintWidth = Math.max(maxBarPaintWidth, mOuterSize);
        int height = 0;
        int width = 0;
        switch (mProgressStyle) {
            case ProgressStyle.FILL_IN:
                height = getPaddingTop() + getPaddingBottom()  // 邊距
                        + Math.abs(mRadius * 2);  // 直徑
                width = getPaddingLeft() + getPaddingRight()  // 邊距
                        + Math.abs(mRadius * 2);  // 直徑
                break;
            case ProgressStyle.FILL_IN_ARC:
                height = getPaddingTop() + getPaddingBottom()  // 邊距
                        + Math.abs(mRadius * 2)  // 直徑
                        + maxPaintWidth;// 邊框
                width = getPaddingLeft() + getPaddingRight()  // 邊距
                        + Math.abs(mRadius * 2)  // 直徑
                        + maxPaintWidth;// 邊框
                break;
            case ProgressStyle.NORMAL:
                height = getPaddingTop() + getPaddingBottom()  // 邊距
                        + Math.abs(mRadius * 2)  // 直徑
                        + maxBarPaintWidth;// 邊框
                width = getPaddingLeft() + getPaddingRight()  // 邊距
                        + Math.abs(mRadius * 2)  // 直徑
                        + maxBarPaintWidth;// 邊框
                break;
        }

        mRealWidth = resolveSize(width, widthMeasureSpec);
        mRealHeight = resolveSize(height, heightMeasureSpec);

        setMeasuredDimension(mRealWidth, mRealHeight);
    }

    @Override
    protected synchronized void onDraw(Canvas canvas) {
        switch (mProgressStyle) {
            case ProgressStyle.NORMAL:
                drawNormalCircle(canvas);
                break;
            case ProgressStyle.FILL_IN:
                drawFillInCircle(canvas);
                break;
            case ProgressStyle.FILL_IN_ARC:
                drawFillInArcCircle(canvas);
                break;
        }
    }

    /**
     * 繪製PROGRESS_STYLE_FILL_IN_ARC圓形
     */
    private void drawFillInArcCircle(Canvas canvas) {
        canvas.save();
        canvas.translate(mRealWidth / 2, mRealHeight / 2);
        // 繪製外層圓環
        canvas.drawArc(rectF, 0, 360, false, mOutPaint);
        // 繪製內層進度實心圓弧
        // 內層圓弧半徑
        float reachArc = getProgress() * 1.0f / getMax() * 360;
        canvas.drawArc(rectInner, mStartArc, reachArc, true, mReachPaint);

        // 繪製未到達進度
        if (reachArc != 360) {
            canvas.drawArc(rectInner, reachArc + mStartArc, 360 - reachArc, true, mNormalPaint);
        }

        canvas.restore();
    }

    /**
     * 繪製PROGRESS_STYLE_FILL_IN圓形
     */
    private void drawFillInCircle(Canvas canvas) {
        canvas.save();
        canvas.translate(mRealWidth / 2, mRealHeight / 2);
        float progressY = getProgress() * 1.0f / getMax() * (mRadius * 2);
        float angle = (float) (Math.acos((mRadius - progressY) / mRadius) * 180 / Math.PI);
        float startAngle = 90 + angle;
        float sweepAngle = 360 - angle * 2;
        // 繪製未到達區域
        rectF = new RectF(-mRadius, -mRadius, mRadius, mRadius);
        mNormalPaint.setStyle(Paint.Style.FILL);
        canvas.drawArc(rectF, startAngle, sweepAngle, false, mNormalPaint);
        // 翻轉180度繪製已到達區域
        canvas.rotate(180);
        mReachPaint.setStyle(Paint.Style.FILL);
        canvas.drawArc(rectF, 270 - angle, angle * 2, false, mReachPaint);
        // 文字顯示在最上層最後繪製
        canvas.rotate(180);
        // 繪製文字
        if (mTextVisible) {
            String text = mTextPrefix + getProgress() + mTextSuffix;
            float textWidth = mTextPaint.measureText(text);
            float textHeight = (mTextPaint.descent() + mTextPaint.ascent());
            canvas.drawText(text, -textWidth / 2, -textHeight / 2, mTextPaint);
        }
    }

    /**
     * 繪製PROGRESS_STYLE_NORMAL圓形
     */
    private void drawNormalCircle(Canvas canvas) {
        canvas.save();
        canvas.translate(mRealWidth / 2, mRealHeight / 2);
        // 繪製內部圓形背景色
        if (needDrawInnerBackground) {
            canvas.drawCircle(0, 0, mRadius - Math.min(mReachBarSize, mNormalBarSize) / 2,
                    mInnerBackgroundPaint);
        }
        // 繪製文字
        if (mTextVisible) {
            String text = mTextPrefix + getProgress() + mTextSuffix;
            float textWidth = mTextPaint.measureText(text);
            float textHeight = (mTextPaint.descent() + mTextPaint.ascent());
            canvas.drawText(text, -textWidth / 2, -textHeight / 2, mTextPaint);
        }
        // 計算進度值
        float reachArc = getProgress() * 1.0f / getMax() * 360;
        // 繪製未到達進度
        if (reachArc != 360) {
            canvas.drawArc(rectF, reachArc + mStartArc, 360 - reachArc, false, mNormalPaint);
        }
        // 繪製已到達進度
        canvas.drawArc(rectF, mStartArc, reachArc, false, mReachPaint);
        canvas.restore();
    }

    /**
     * 動畫進度(0-當前進度)
     *
     * @param duration 動畫時長
     */
    public void runProgressAnim(long duration) {
        setProgressInTime(0, duration);
    }

    /**
     * @param progress 進度值
     * @param duration 動畫播放時間
     */
    public void setProgressInTime(final int progress, final long duration) {
        setProgressInTime(progress, getProgress(), duration);
    }

    /**
     * @param startProgress 起始進度
     * @param progress      進度值
     * @param duration      動畫播放時間
     */
    public void setProgressInTime(int startProgress, final int progress, final long duration) {
        ValueAnimator valueAnimator = ValueAnimator.ofInt(startProgress, progress);
        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

            @Override
            public void onAnimationUpdate(ValueAnimator animator) {
                //獲得當前動畫的進度值，整型，1-100之間
                int currentValue = (Integer) animator.getAnimatedValue();
                setProgress(currentValue);
            }
        });
        AccelerateDecelerateInterpolator interpolator = new AccelerateDecelerateInterpolator();
        valueAnimator.setInterpolator(interpolator);
        valueAnimator.setDuration(duration);
        valueAnimator.start();
    }

    public int getReachBarSize() {
        return mReachBarSize;
    }

    public void setReachBarSize(int reachBarSize) {
        mReachBarSize = DisplayUtil.dip2px(getContext(), reachBarSize);
        invalidate();
    }

    public int getNormalBarSize() {
        return mNormalBarSize;
    }

    public void setNormalBarSize(int normalBarSize) {
        mNormalBarSize = DisplayUtil.dip2px(getContext(), normalBarSize);
        invalidate();
    }

    public int getReachBarColor() {
        return mReachBarColor;
    }

    public void setReachBarColor(int reachBarColor) {
        mReachBarColor = reachBarColor;
        invalidate();
    }

    public int getNormalBarColor() {
        return mNormalBarColor;
    }

    public void setNormalBarColor(int normalBarColor) {
        mNormalBarColor = normalBarColor;
        invalidate();
    }

    public int getTextSize() {
        return mTextSize;
    }

    public void setTextSize(int textSize) {
        mTextSize = DisplayUtil.sp2px(getContext(), textSize);
        invalidate();
    }

    public int getTextColor() {
        return mTextColor;
    }

    public void setTextColor(int textColor) {
        mTextColor = textColor;
        invalidate();
    }

    public float getTextSkewX() {
        return mTextSkewX;
    }

    public void setTextSkewX(float textSkewX) {
        mTextSkewX = textSkewX;
        invalidate();
    }

    public String getTextSuffix() {
        return mTextSuffix;
    }

    public void setTextSuffix(String textSuffix) {
        mTextSuffix = textSuffix;
        invalidate();
    }

    public String getTextPrefix() {
        return mTextPrefix;
    }

    public void setTextPrefix(String textPrefix) {
        mTextPrefix = textPrefix;
        invalidate();
    }

    public boolean isTextVisible() {
        return mTextVisible;
    }

    public void setTextVisible(boolean textVisible) {
        mTextVisible = textVisible;
        invalidate();
    }

    public boolean isReachCapRound() {
        return mReachCapRound;
    }

    public void setReachCapRound(boolean reachCapRound) {
        mReachCapRound = reachCapRound;
        invalidate();
    }

    public int getRadius() {
        return mRadius;
    }

    public void setRadius(int radius) {
        mRadius = DisplayUtil.dip2px(getContext(), radius);
        invalidate();
    }

    public int getStartArc() {
        return mStartArc;
    }

    public void setStartArc(int startArc) {
        mStartArc = startArc;
        invalidate();
    }

    public int getInnerBackgroundColor() {
        return mInnerBackgroundColor;
    }

    public void setInnerBackgroundColor(int innerBackgroundColor) {
        mInnerBackgroundColor = innerBackgroundColor;
        invalidate();
    }

    public int getProgressStyle() {
        return mProgressStyle;
    }

    public void setProgressStyle(int progressStyle) {
        mProgressStyle = progressStyle;
        invalidate();
    }

    public int getInnerPadding() {
        return mInnerPadding;
    }

    public void setInnerPadding(int innerPadding) {
        mInnerPadding = DisplayUtil.dip2px(getContext(), innerPadding);
        int mInnerRadius = mRadius - mOuterSize / 2 - mInnerPadding;
        rectInner = new RectF(-mInnerRadius, -mInnerRadius, mInnerRadius, mInnerRadius);
        invalidate();
    }

    public int getOuterColor() {
        return mOuterColor;
    }

    public void setOuterColor(int outerColor) {
        mOuterColor = outerColor;
        invalidate();
    }

    public int getOuterSize() {
        return mOuterSize;
    }

    public void setOuterSize(int outerSize) {
        mOuterSize = DisplayUtil.dip2px(getContext(), outerSize);
        invalidate();
    }

    private static final String STATE = "state";
    private static final String PROGRESS_STYLE = "progressStyle";
    private static final String TEXT_COLOR = "textColor";
    private static final String TEXT_SIZE = "textSize";
    private static final String TEXT_SKEW_X = "textSkewX";
    private static final String TEXT_VISIBLE = "textVisible";
    private static final String TEXT_SUFFIX = "textSuffix";
    private static final String TEXT_PREFIX = "textPrefix";
    private static final String REACH_BAR_COLOR = "reachBarColor";
    private static final String REACH_BAR_SIZE = "reachBarSize";
    private static final String NORMAL_BAR_COLOR = "normalBarColor";
    private static final String NORMAL_BAR_SIZE = "normalBarSize";
    private static final String IS_REACH_CAP_ROUND = "isReachCapRound";
    private static final String RADIUS = "radius";
    private static final String START_ARC = "startArc";
    private static final String INNER_BG_COLOR = "innerBgColor";
    private static final String INNER_PADDING = "innerPadding";
    private static final String OUTER_COLOR = "outerColor";
    private static final String OUTER_SIZE = "outerSize";

    @Override
    public Parcelable onSaveInstanceState() {
        final Bundle bundle = new Bundle();
        bundle.putParcelable(STATE, super.onSaveInstanceState());
        // 儲存當前樣式
        bundle.putInt(PROGRESS_STYLE, getProgressStyle());
        bundle.putInt(RADIUS, getRadius());
        bundle.putBoolean(IS_REACH_CAP_ROUND, isReachCapRound());
        bundle.putInt(START_ARC, getStartArc());
        bundle.putInt(INNER_BG_COLOR, getInnerBackgroundColor());
        bundle.putInt(INNER_PADDING, getInnerPadding());
        bundle.putInt(OUTER_COLOR, getOuterColor());
        bundle.putInt(OUTER_SIZE, getOuterSize());
        // 儲存text資訊
        bundle.putInt(TEXT_COLOR, getTextColor());
        bundle.putInt(TEXT_SIZE, getTextSize());
        bundle.putFloat(TEXT_SKEW_X, getTextSkewX());
        bundle.putBoolean(TEXT_VISIBLE, isTextVisible());
        bundle.putString(TEXT_SUFFIX, getTextSuffix());
        bundle.putString(TEXT_PREFIX, getTextPrefix());
        // 儲存已到達進度資訊
        bundle.putInt(REACH_BAR_COLOR, getReachBarColor());
        bundle.putInt(REACH_BAR_SIZE, getReachBarSize());

        // 儲存未到達進度資訊
        bundle.putInt(NORMAL_BAR_COLOR, getNormalBarColor());
        bundle.putInt(NORMAL_BAR_SIZE, getNormalBarSize());
        return bundle;
    }

    @Override
    public void onRestoreInstanceState(Parcelable state) {
        if (state instanceof Bundle) {
            final Bundle bundle = (Bundle) state;

            mProgressStyle = bundle.getInt(PROGRESS_STYLE);
            mRadius = bundle.getInt(RADIUS);
            mReachCapRound = bundle.getBoolean(IS_REACH_CAP_ROUND);
            mStartArc = bundle.getInt(START_ARC);
            mInnerBackgroundColor = bundle.getInt(INNER_BG_COLOR);
            mInnerPadding = bundle.getInt(INNER_PADDING);
            mOuterColor = bundle.getInt(OUTER_COLOR);
            mOuterSize = bundle.getInt(OUTER_SIZE);

            mTextColor = bundle.getInt(TEXT_COLOR);
            mTextSize = bundle.getInt(TEXT_SIZE);
            mTextSkewX = bundle.getFloat(TEXT_SKEW_X);
            mTextVisible = bundle.getBoolean(TEXT_VISIBLE);
            mTextSuffix = bundle.getString(TEXT_SUFFIX);
            mTextPrefix = bundle.getString(TEXT_PREFIX);

            mReachBarColor = bundle.getInt(REACH_BAR_COLOR);
            mReachBarSize = bundle.getInt(REACH_BAR_SIZE);
            mNormalBarColor = bundle.getInt(NORMAL_BAR_COLOR);
            mNormalBarSize = bundle.getInt(NORMAL_BAR_SIZE);

            initPaint();
            super.onRestoreInstanceState(bundle.getParcelable(STATE));
            return;
        }
        super.onRestoreInstanceState(state);
    }

    @Override
    public void invalidate() {
        initPaint();
        super.invalidate();
    }
}
 

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工具類DisplayUtil：

public class DisplayUtil {

    private static WindowManager windowManager;

    private static WindowManager getWindowManager(Context context) {
        if (windowManager == null) {
            windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        }
        return windowManager;
    }

    // 根據手機的解析度將dp的單位轉成px(畫素)
    public static int dip2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }

    // 根據手機的解析度將px(畫素)的單位轉成dp
    public static int px2dip(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);
    }

    // 將px值轉換為sp值
    public static int px2sp(Context context, float pxValue) {
        final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
        return (int) (pxValue / fontScale + 0.5f);
    }

    // 將sp值轉換為px值
    public static int sp2px(Context context, float spValue) {
        final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
        return (int) (spValue * fontScale + 0.5f);
    }

    // 螢幕寬度（畫素）
    public static int getScreenWidth(Context context) {
        DisplayMetrics metric = new DisplayMetrics();
        getWindowManager(context).getDefaultDisplay().getMetrics(metric);
        return metric.widthPixels;
    }

    // 螢幕高度（畫素）
    public static int getScreenHeight(Context context) {
        DisplayMetrics metric = new DisplayMetrics();
        getWindowManager(context).getDefaultDisplay().getMetrics(metric);
        return metric.heightPixels;
    }

    public static float getScreenDensity(Context context) {
        try {
            DisplayMetrics displayMetrics = new DisplayMetrics();
            getWindowManager(context).getDefaultDisplay().getMetrics(displayMetrics);
            return displayMetrics.density;
        } catch (Throwable e) {
            e.printStackTrace();
            return 1.0f;
        }
    }

    public static int getDensityDpi(Context context) {
        try {
            DisplayMetrics displayMetrics = new DisplayMetrics();
            getWindowManager(context).getDefaultDisplay().getMetrics(displayMetrics);
            return displayMetrics.densityDpi;
        } catch (Throwable e) {
            e.printStackTrace();
            return 320;
        }
    }
}

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最後還有Style檔案中：

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

    <declare-styleable name="CircleProgressView">
        <attr name="cpv_progressNormalColor" format="color" />  <!--非進度區域的顏色-->
        <attr name="cpv_progressReachColor" format="color" />   <!--進度區域的顏色-->
        <attr name="cpv_progressTextColor" format="color" />    <!--進度條文字的顏色-->
        <attr name="cpv_progressTextSize" format="dimension" />  <!--進度條文字的大小-->
        <attr name="cpv_progressTextOffset" format="dimension" /> <!--進度條文字的偏移-->
        <attr name="cpv_progressNormalSize" format="dimension" />  <!--正常尺寸-->
        <attr name="cpv_progressReachSize" format="dimension" />   <!--進度的尺寸-->
        <attr name="cpv_radius" format="dimension" />              <!--半徑,控制顯示大小-->
        <attr name="cpv_progressTextVisible" format="boolean" />  <!--進度條文字是否顯示-->
        <attr name="cpv_progressStartArc" format="integer" />
        <attr name="cpv_progressTextSkewX" format="dimension" />
        <attr name="cpv_progressTextPrefix" format="string" />
        <attr name="cpv_progressTextSuffix" format="string" />
        <attr name="cpv_innerBackgroundColor" format="color" />  <!--內背景顏色-->
        <attr name="cpv_progressStyle" format="enum">  <!-- 進度條樣式3選1 -->
            <enum name="Normal" value="0" />
            <enum name="FillInner" value="1" />
            <enum name="FillInnerArc" value="2" />
        </attr>
        <attr name="cpv_innerProgressColor" format="color" />
        <attr name="cpv_innerPadding" format="dimension" />
        <attr name="cpv_outerColor" format="color" />
        <attr name="cpv_outerSize" format="dimension" />
        <attr name="cpv_reachCapRound" format="boolean" />
    </declare-styleable>

</resources>

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如何使用

<com.gpf.myapp.CircleProgressView
        android:id="@+id/progressView"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_centerInParent="true"
        android:progress="50"
        app:cpv_innerPadding="2dp"
        app:cpv_outerColor="@color/transparent90_white"
        app:cpv_outerSize="1dp"
        app:cpv_progressNormalColor="@color/transparent"
        app:cpv_progressReachColor="@color/transparent90_white"
        app:cpv_progressStyle="FillInnerArc"/>

    <com.gpf.myapp.CircleProgressView
        android:id="@+id/progressView2"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_centerInParent="true"
        android:layout_margin="10dp"
        android:progress="50"
        app:cpv_progressNormalColor="@color/transparent10"
        app:cpv_progressReachColor="@color/transparent90_white"
        app:cpv_progressStyle="FillInner"
        app:cpv_progressTextColor="@color/red"
        app:cpv_progressTextSize="13sp"
        app:cpv_progressTextVisible="true"/>

    <com.gpf.myapp.CircleProgressView
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_centerInParent="true"
        android:progress="50"
        app:cpv_innerPadding="2dp"
        app:cpv_outerColor="@color/transparent90_white"
        app:cpv_outerSize="1dp"
        app:cpv_progressNormalColor="@color/transparent"
        app:cpv_progressReachColor="@color/transparent90_white"
        app:cpv_progressStyle="Normal"/>

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提供幾個顏色資源：

<color name="transparent">#00000000</color>
    <color name="transparent90_white">#E5ffffff</color>
    <color name="transparent10">#1A000000</color>

    <color name="placeholder">#33000000</color>
    <color name="placeholder_yellow">#33fbc02d</color>
    <color name="placeholder_orange">#33f57c00</color>

    <color name="white">#FFFFFF</color>  <!-- 白色 -->
    <color name="yellow">#fbc02d</color> <!-- 黃色 -->
    <color name="gold">#FFD700</color>   <!-- 金色 -->
    <color name="orange">#f57c00</color> <!-- 橙色 -->
    <color name="red">#d01716</color>    <!-- 紅色 -->
    <color name="gray">#808080</color>   <!-- 灰色 -->
    <color name="green">#0a7e07</color>  <!-- 綠色 -->
    <color name="blue">#455ede</color>   <!-- 藍色 -->
    <color name="black">#000000</color>  <!--