Android 如何在通话中播放音乐/通话背景音

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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
。。。
}

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