Android Material Design（1）Floating Action Button

Android with Material Design . 在GitHub上看到的开源库，自己下载下来研究了一下，效果图：

好东西要分享， GitHub下载地址：

    void init(Context context, AttributeSet attributeSet) {
        TypedArray attr = context.obtainStyledAttributes(attributeSet, R.styleable.FloatingActionButton, 0, 0);
        mColorNormal = attr.getColor(R.styleable.FloatingActionButton_fab_colorNormal, getColor(android.R.color.holo_blue_dark));
        mColorPressed = attr.getColor(R.styleable.FloatingActionButton_fab_colorPressed, getColor(android.R.color.holo_blue_light));
        mColorDisabled = attr.getColor(R.styleable.FloatingActionButton_fab_colorDisabled, getColor(android.R.color.darker_gray));
        mSize = attr.getInt(R.styleable.FloatingActionButton_fab_size, SIZE_NORMAL);
        mIcon = attr.getResourceId(R.styleable.FloatingActionButton_fab_icon, 0);
        mTitle = attr.getString(R.styleable.FloatingActionButton_fab_title);
        mStrokeVisible = attr.getBoolean(R.styleable.FloatingActionButton_fab_stroke_visible, true);
        attr.recycle();

        updateCircleSize();
        mShadowRadius = getDimension(R.dimen.fab_shadow_radius);
        mShadowOffset = getDimension(R.dimen.fab_shadow_offset);
        updateDrawableSize();
        updateBackground();
    }

private void updateDrawableSize() {
        mDrawableSize = (int) (mCircleSize + 2 * mShadowRadius);
    }

    private void updateCircleSize() {
        mCircleSize = getDimension(mSize == SIZE_NORMAL ? R.dimen.fab_size_normal : R.dimen.fab_size_mini);
    }

    public void setSize(@FAB_SIZE int size) {
        if (size != SIZE_MINI && size != SIZE_NORMAL) {
            throw new IllegalArgumentException("Use @FAB_SIZE constants only!");
        }

        if (mSize != size) {
            mSize = size;
            updateCircleSize();
            updateDrawableSize();
            updateBackground();
        }
    }

    @FAB_SIZE
    public int getSize() {
        return mSize;
    }

    public void setIcon(@DrawableRes int icon) {
        if (mIcon != icon) {
            mIcon = icon;
            mIconDrawable = null;
            updateBackground();
        }
    }

    public void setIconDrawable(@NonNull Drawable iconDrawable) {
        if (mIconDrawable != iconDrawable) {
            mIcon = 0;
            mIconDrawable = iconDrawable;
            updateBackground();
        }
    }

    /**
     * @return the current Color for normal state.
     */
    public int getColorNormal() {
        return mColorNormal;
    }

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