品牌型号：华为p50 系统：HarmonyOS 2.0.0设置手机黑屏显示时间需要在桌面和壁纸中，将熄屏显示开启即可。以手机华为p50为例，设置手机黑屏显示时间的步骤分为3步，具体操作如下：开发者_高[详细]
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