SlidingMenu侧滑剩余的位置添加阴影淡入淡出

在SlidingMenu添加一个设置透明度方法

public void setOffsetFadeDegree(float f) {        mViewBehind.setOffsetFadeDegree(f);    }

CustomViewBehind 添加变量和方法

private float mOffsetFadeDegree;public void setOffsetFadeDegree(float degree) {        if (degree > 1.0f || degree < 0.0f)            throw new IllegalStateException("The offsetFadeDegree must be between 0.0f and 1.0f");        mOffsetFadeDegree = degree;    }    /**     * 绘制剩余View的淡出淡入     * @param content 主界面     * @param canvas  画布     * @param openPercent 打开了的百分比     */    public void drawOffsetFade(View content, Canvas canvas, float openPercent) {        if (mWidthOffset <= 0 || mOffsetFadeDegree <= 0) return;   //不开启就返回，不设置 淡入淡出效果        final int alpha = (int) (mOffsetFadeDegree * 255 * Math.abs(openPercent));        mFadePaint.setColor(Color.argb(alpha, 0, 0, 0));        canvas.drawRect(content.getLeft(), 0,content.getRight(), getHeight(), mFadePaint);    }

最后在CustomViewAbove 的dispatchDraw 绘制view 里面调用drawOffsetFade

@Override    protected void dispatchDraw(Canvas canvas) {        super.dispatchDraw(canvas);        // Draw the margin drawable if needed.        mViewBehind.drawShadow(mContent, canvas);        mViewBehind.drawFade(mContent, canvas, getPercentOpen());    //绘制剩余View的淡入淡出        mViewBehind.drawOffsetFade(mContent, canvas, getPercentOpen());        mViewBehind.drawSelector(mContent, canvas, getPercentOpen());   //    }

最后在继承SlidingFragmentActivity下的Activity调用

sm.setOffsetFadeDegree(0.4f);