修改前
修改后
修改清单packages/apps/Launcher3/res/drawable-mdpi/ic_allapps.png packages/apps/Launcher3/res/drawable-mdpi/ic_allapps_pressed

修改前
修改后
修改清单packages/apps/Launcher3/res/drawable-mdpi/ic_allapps.png packages/apps/Launcher3/res/drawable-mdpi/ic_allapps_pressed