The Android transparent status bar has a gradient shadow effect

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How do I remove a gradient shadow effect when the status bar is transparent?This is the Google Default design, if the desktop wallpaper is white when the more obvious, this progressive effect is set by the background map, in the frameworks/base/packages/systemui/res/ Inside DRAWABLE-HDPI (if is other density, please find corresponding resources) in status_background.9.png replace this picture;or modify the place where the code draws the picture:Bartransitions.java file Last Draw method Mgradient.draw (canvas);//comment out this line without drawing this picture.