无法解析导入的seekBar视图的符号

Question

我是Android开发的新手，我正在开发第一个应用程序。

我为我的项目添加了一个循环的seekBar视图，但它无效。

我从以下链接导入了视图，并按照快速入门说明操作：https://github.com/feeeei/CircleSeekbar

我的IDE是Android Studio。我正在使用Android SDK 23.问题似乎与 无法在CircularSeekBar.java文件中解析标记为CircularSeekBar_x的符号。 （例如：CircularSeekBar_circle_x_radius）。

请参阅下面的代码段。

我感谢任何帮助。先感谢您。

UPDATE：我发现R.styleable.CircularSeekBar_x变量导致错误，因为R文件中没有生成错误。问题是为什么它们没有生成？有谁知道这些变量将存储（或应该）存储在哪里？

    /**
     * Initialize the CircularSeekBar with the attributes from the XML style.
     * Uses the defaults defined at the top of this file when an attribute is not specified by the user.
     * @param attrArray TypedArray containing the attributes.
     */
    protected void initAttributes(TypedArray attrArray) {
        mCircleXRadius = attrArray.getDimension(R.styleable.CircularSeekBar_circle_x_radius, DEFAULT_CIRCLE_X_RADIUS * DPTOPX_SCALE);
        mCircleYRadius = attrArray.getDimension(R.styleable.CircularSeekBar_circle_y_radius, DEFAULT_CIRCLE_Y_RADIUS * DPTOPX_SCALE);
        mPointerRadius = attrArray.getDimension(R.styleable.CircularSeekBar_pointer_radius, DEFAULT_POINTER_RADIUS * DPTOPX_SCALE);
        mPointerHaloWidth = attrArray.getDimension(R.styleable.CircularSeekBar_pointer_halo_width, DEFAULT_POINTER_HALO_WIDTH * DPTOPX_SCALE);
        mPointerHaloBorderWidth = attrArray.getDimension(R.styleable.CircularSeekBar_pointer_halo_border_width, DEFAULT_POINTER_HALO_BORDER_WIDTH * DPTOPX_SCALE);
        mCircleStrokeWidth = attrArray.getDimension(R.styleable.CircularSeekBar_circle_stroke_width, DEFAULT_CIRCLE_STROKE_WIDTH * DPTOPX_SCALE);

        mPointerColor = attrArray.getColor(R.styleable.CircularSeekBar_pointer_color, DEFAULT_POINTER_COLOR);
        mPointerHaloColor = attrArray.getColor(R.styleable.CircularSeekBar_pointer_halo_color, DEFAULT_POINTER_HALO_COLOR);
        mPointerHaloColorOnTouch = attrArray.getColor(R.styleable.CircularSeekBar_pointer_halo_color_ontouch, DEFAULT_POINTER_HALO_COLOR_ONTOUCH);
        mCircleColor = attrArray.getColor(R.styleable.CircularSeekBar_circle_color, DEFAULT_CIRCLE_COLOR);
        mCircleProgressColor = attrArray.getColor(R.styleable.CircularSeekBar_circle_progress_color, DEFAULT_CIRCLE_PROGRESS_COLOR);
        mCircleFillColor = attrArray.getColor(R.styleable.CircularSeekBar_circle_fill, DEFAULT_CIRCLE_FILL_COLOR);

        mPointerAlpha = Color.alpha(mPointerHaloColor);

        mPointerAlphaOnTouch = attrArray.getInt(R.styleable.CircularSeekBar_pointer_alpha_ontouch, DEFAULT_POINTER_ALPHA_ONTOUCH);
        if (mPointerAlphaOnTouch > 255 || mPointerAlphaOnTouch < 0) {
            mPointerAlphaOnTouch = DEFAULT_POINTER_ALPHA_ONTOUCH;
        }

        mMax = attrArray.getInt(R.styleable.CircularSeekBar_max, DEFAULT_MAX);
        mProgress = attrArray.getInt(R.styleable.CircularSeekBar_progress, DEFAULT_PROGRESS);
        mCustomRadii = attrArray.getBoolean(R.styleable.CircularSeekBar_use_custom_radii, DEFAULT_USE_CUSTOM_RADII);
        mMaintainEqualCircle = attrArray.getBoolean(R.styleable.CircularSeekBar_maintain_equal_circle, DEFAULT_MAINTAIN_EQUAL_CIRCLE);
        mMoveOutsideCircle = attrArray.getBoolean(R.styleable.CircularSeekBar_move_outside_circle, DEFAULT_MOVE_OUTSIDE_CIRCLE);
        lockEnabled = attrArray.getBoolean(R.styleable.CircularSeekBar_lock_enabled, DEFAULT_LOCK_ENABLED);

        // Modulo 360 right now to avoid constant conversion
        mStartAngle = ((360f + (attrArray.getFloat((R.styleable.CircularSeekBar_start_angle), DEFAULT_START_ANGLE) % 360f)) % 360f);
        mEndAngle = ((360f + (attrArray.getFloat((R.styleable.CircularSeekBar_end_angle), DEFAULT_END_ANGLE) % 360f)) % 360f);