#创作者激励#[触觉智能RK3568]修改屏幕 DPI(像素密度) 原创 精华

    <!--Window display dpi, valid range is 80~640, use 0 if no configuration is requeired-->
    <dpi>240</dpi>
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    <!--Window display dpi, valid range is 80~640, use 0 if no configuration is requeired-->
    <dpi>240</dpi>
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foundation/window/window_manager/resources/config/BULID.gn文件如下，
下面代码的意思是源码foundation/window/window_manager/resources/config/rk3568/display_manager_config.xml会真正安装在设备中的etc/window/resources文件位置，

ohos_prebuilt_etc("display_manager_config") {
  if (device_name == "rk3568") {
    source = "//foundation/window/window_manager/resources/config/rk3568/display_manager_config.xml"
    install_enable = true
···
···
  relative_install_dir = "window/resources"
}
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# 进入sdk\版本号\toolchain输入cmd打开命令行，重新加载系统为可读写
D:\DevEco Studio\sdk\9\toolchains>hdc_std shell mount -o remount,rw /

# 替换/etc/window/resources中的display_manager_config.xml文件
D:\DevEco Studio\sdk\9\toolchains>hdc_std file send C:\Users\jjh\display_manager_config.xml /etc/window/resources

然后重启开发板让设置生效
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templates/common/copy.gni文件中：

template("ohos_copy") {
  assert(defined(invoker.sources),
         "sources must be defined for ${target_name}.")
  assert(defined(invoker.outputs),
         "outputs must be defined for ${target_name}.")
...
      if (_is_prebuilt) {
        _outputs = invoker.outputs
        module_source = string_replace(_outputs[0], "${target_out_dir}/", "", 1)
      }
      prebuilt = _is_prebuilt
···
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templates/cxx/prebuilt.gni文件中：
template("ohos_prebuilt_xxx") {
···
# 如果.gn文件中为ohos_prebuilt_xxx指定了out属性，文件名称被另外指定。没有则默认为原名称
  if (defined(invoker.output)) {
    _copy_output = "${target_out_dir}/${invoker.output}"
  } else {
    _copy_output = "${target_out_dir}/${invoker.source}"
  }
···
    outputs = [ _copy_output ]
}
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hdc_std shell mount -o rw,remount /
hdc_std shell "sed -i 's/enforcing/permissive/g' /system/etc/selinux/config"
hdc_std shell "cat /system/etc/selinux/config |grep SELINUX="
# 重启设备
hdc_std shell reboot
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hdc_std shell mount -o rw,remount /
hdc_std shell "sed -i 's/permissive/enforcing/g' /system/etc/selinux/config"
hdc_std shell "cat /system/etc/selinux/config |grep SELINUX="
# 重启设备
hdc_std shell reboot
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