在Activity中加入以下代码：
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
int flagTranslucentStatus = WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS;
int flagTranslucentNavigation = WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
Window window = getWindow();
WindowManager.LayoutParams attributes = window.getAttributes();
attributes.flags |= flagTranslucentNavigation;
window.setAttributes(attributes);
getWindow().setStatusBarColor(Color.TRANSPARENT);
} else {
Window window = getWindow();
WindowManager.LayoutParams attributes = window.getAttributes();
attributes.flags |= flagTranslucentStatus | flagTranslucentNavigation;
window.setAttributes(attributes);
}
}
