update readme.md

Android/README.md

@@ -66,6 +66,9 @@ This document introduces how to quickly run through the IM demo.
 ## Step 4: Compile and Run the Demo (All Features)
 Import the demo project with Android Studio, and then compile and run it.
 
+> **The demo integrates the audio and video call function by default. Since the audio and video SDK that this function depends on does not support the emulator, please use a real device to debug or run the demo.**
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 ## Step 5: Compile and Run the Demo (Removing the Audio/Video Call Feature)
 If you do not need the audio/video call feature, you only delete the audio/video call integration code as shown in the figure below from the `build.gradle` file under the `app` module:
 

Android/README_ZH.md

@@ -67,6 +67,8 @@
 ## 步骤4：编译运行（全部功能）
 用 Android Studio 导入工程直接编译运行即可。
 
+> **Demo 默认集成了音视频通话功能，由于该功能依赖的音视频 SDK 暂不支持模拟器，请使用真机调试或者运行 Demo。**
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 ## 步骤5：编译运行（移除音视频通话）
 如果您不需要音视频通话功能，只需要在 `app 模块` 的 `build.gradle` 文件中删除音视频通话模块集成代码即可：