Android通话默认打开Speaker

修改文件：

frameworks-base/telecomm/java/android/telecom/InCallService.java

在此处的onCreate方法中添加一个PhoneStateListener用以监听Phone状态并进而控制AudioRoute。

FYI：

    @Override
    public void onCreate() {
         super.onCreate();
        SpeakerPhoneStateListener speakerPhoneStateListener=new SpeakerPhoneStateListener();
        TelephonyManager  mTelephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        mTelephonyManager.listen(speakerPhoneStateListener,PhoneStateListener.LISTEN_CALL_STATE);
    }

    private class SpeakerPhoneStateListener extends PhoneStateListener{
        @Override
        public void onCallStateChanged(int state, String incomingNumber) {
            switch (state) {
            case TelephonyManager.CALL_STATE_IDLE:
                setAudioRoute(CallAudioState.ROUTE_EARPIECE);
               break;
            case TelephonyManager.CALL_STATE_RINGING:
                setAudioRoute(CallAudioState.ROUTE_SPEAKER);
                break;
            case TelephonyManager.CALL_STATE_OFFHOOK:
            setAudioRoute(CallAudioState.ROUTE_SPEAKER);
            default:
                break;
            }
            super.onCallStateChanged(state, incomingNumber);
        }
    }

MTK平台修改ro也能达到同样效果，将MTK_TB_APP_CALL_FORCE_SPEAKER_ON配置为yes即可。
PS：这种方案MO的时候生效，MT的时候不生效。根据实际需求修改即可。

ifeq ($(strip $(MTK_TB_APP_CALL_FORCE_SPEAKER_ON)), yes)
  PRODUCT_PROPERTY_OVERRIDES += ro.vendor.mtk_tb_call_speaker_on=1
endif