正常情况下的样子： 

 下拉App抽屉后的样子：

修改方案：

qssi14/packages/apps/Launcher3/src/com/android/launcher3/allapps/ActivityAllAppsContainerView.java

 protected void updateHeaderScroll(int scrolledOffset) {float prog1 = Utilities.boundToRange((float) scrolledOffset / mHeaderThreshold, 0f, 1f);int headerColor = getHeaderColor(prog1);
//注释相关代码
//        int tabsAlpha = mHeader.getPeripheralProtectionHeight() == 0 ? 0
//                : (int) (Utilities.boundToRange(
//                        (scrolledOffset + mHeader.mSnappedScrolledY) /mHeaderThreshold, 0f, 1f)
//                        * 255);
//        if (headerColor != mHeaderColor || mTabsProtectionAlpha != tabsAlpha) {
//            mHeaderColor = headerColor;
//            mTabsProtectionAlpha = tabsAlpha;
//            invalidateHeader();
//        }if (mSearchUiManager.getEditText() == null) {return;}