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从 Android 应用程序检查 HDMI 显示状态？

[英]Checking HDMI display status from Android app?

原文 2012-09-13 07:06:28 4 2 android/ hdmi

I need to write an Android service that detects when an external HDMI monitor goes offline (or comes back online).我需要编写一个 Android 服务来检测外部 HDMI 显示器何时脱机（或重新联机）。 The purpose of the service is to notify employees if one of the public TV screens (powered by Android) malfunctions.该服务的目的是在公共电视屏幕（由 Android 驱动）之一出现故障时通知员工。 The problem - as far as I've been able to research - Android has no concept of an HDMI API (although some manufacturers have their own implementations).问题 - 就我所能研究的而言 - Android 没有 HDMI API 的概念（尽管一些制造商有自己的实现）。

The box in use is Android 2.3 HD 1080P Internet TV Box WIFI Media Player HDTV MP3/WMA .使用的盒子是Android 2.3 高清 1080P 互联网电视盒 WIFI 媒体播放器 HDTV MP3/WMA 。 My best bet is using the Power or DisplayMetrics API-s to determine if the current screen is HDMI.我最好的选择是使用Power或DisplayMetrics API-s 来确定当前屏幕是否为 HDMI。

Can this be done on Android 2.3?这可以在 Android 2.3 上完成吗？

2 个解决方案

Only as of Android 3.0 the common sysfs location was included in the sources where you could check if the HDMI is ON or OFF - /sys/devices/virtual/switch/hdmi/state .仅从 Android 3.0 开始，公共 sysfs 位置包含在源中，您可以在其中检查 HDMI 是打开还是关闭 - /sys/devices/virtual/switch/hdmi/state 。 Before that (like in Android 2.3) vendors were using custom methods.在此之前（如在 Android 2.3 中）供应商使用自定义方法。 Try to check if your model has some sysfs location where the driver writes this information or check if there are sticky broadcasts related to swiching of HDMI that you can listen to.尝试检查您的模型是否有驱动程序在其中写入此信息的某些 sysfs 位置，或者检查是否有与切换 HDMI 相关的粘性广播可以收听。

You can get the hdmi state from the location /sys/class/display/dispaly0.hdmi/connect.您可以从位置 /sys/class/display/dispaly0.hdmi/connect 获取 hdmi 状态。 It gives the correct Hdmi connected and disconnected state.它给出了正确的 HDMI 连接和断开状态。