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正文

1.修改AudioService.java，实现通话中播放音乐

private boolean canReassignAudioFocus() {

// focus requests are rejected during a phone call or when the phone is ringing

// this is equivalent to IN_VOICE_COMM_FOCUS_ID having the focus

if (!mFocusStack.isEmpty() && IN_VOICE_COMM_FOCUS_ID.equals(mFocusStack.peek().mClientId)) {

return true;  //这里的false改为true

}

return true;

}

2.再修改AudioMTKStreamOut.cpp ssize_t AudioMTKStreamOut::write(const void *buffer, size_t bytes)，可实现通话背景音

{

。。。

case android_audio_legacy::AudioSystem::MODE_IN_CALL:

case android_audio_legacy::AudioSystem::MODE_IN_CALL_2:

pBGSPlayer->Open(pSpeechDriver, 0x0, 0xFF);  //修改为pBGSPlayer->Open(pSpeechDriver, 0xFF, 0xFF); 第一个参数表示Uplink Gain，第二个参数是Downlink Gain

。。。

}