是否有可能在通话过程中播放音乐，使合作伙伴能听到吗？如果是的话我怎么能实现呢？

Is it possible to play music during calls so that the partner can hear it ? if yes how can i implement this ?

推荐答案

您没能找到一个应用程序，这样做是因为这是不可能

You failed to find an app that does this because it is not possible.

该文件明确指出（这里）：

注意：您可以播放音频数据只到标准输出   设备。目前，这是在移动设备的扬声器或蓝牙   耳机。过程中不能播放声音文件的对话音频   打个电话。

Note: You can play back the audio data only to the standard output device. Currently, that is the mobile device speaker or a Bluetooth headset. You cannot play sound files in the conversation audio during a call.

这个决定背后的原因有可能是与安全性：有几个场景，这种能力可用于利弊。

The reason behind this decision has probably something to do with security: there are several scenarios where this capability could be used for cons.

（OP的是这个高度相似，所以我基本上给予了相同的答案）

(the OP is highly similar to this, hence I'm basically giving the same answer)