安卓中app直接切换耳机与扬声器方法_如何代码切换手机的扬声器设备

app中使用如下代码实现：
/**

• 扬声器通道播放
  */
  public static void onSpeakerChannl() {
  AudioManager audioManager = (AudioManager) App.getAppContext().getSystemService(Context.AUDIO_SERVICE);
  audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
  audioManager.stopBluetoothSco();
  audioManager.setBluetoothScoOn(false);
  audioManager.setSpeakerphoneOn(true); // 使用扬声器播放，即使已经插入耳机
  }

/**

• 耳机通道播放
  */
  public static void onHeadSetChannl() {
  AudioManager audioManager = (AudioManager) App.getAppContext().getSystemService(Context.AUDIO_SERVICE);
  audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
  audioManager.stopBluetoothSco();
  audioManager.setBluetoothScoOn(false);
  audioManager.setSpeakerphoneOn(false); // 使用扬声器播放，即使已经插入耳机
  }

app层直接调用系统接口来切换耳机与扬声器来播放声音，在正常的安卓系统中，耳机是通过耳机插入检测与拔出来自动切换这个功能的，所以第一步，把耳机的插入检测功能去掉，

	es8323: es8323@10 {
	status = "okay";
	compatible = "everest,es8323";
	reg = <0x10>;
	spk-con-gpio = <&gpio7 15 GPIO_ACTIVE_HIGH>;
   // hp-det-gpio = <&gpio0 8 GPIO_ACTIVE_LOW>;
	clock-names = "mclk";
	clocks = <&cru SCLK_I2S0_OUT>;
	pinctrl-names = "default";
	pinctrl-0 = <&i2s0_mclk>;
	#sound-dai-cells = <0>;
};
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第二步，看客户app调用的方法是直接调用\frameworks\base\services\core\java\com\android\server\audio\AudioService.java中的setSpeakerphoneOn，

/** @see AudioManager#setSpeakerphoneOn(boolean) */
public void setSpeakerphoneOn(boolean on){
    if (!checkAudioSettingsPermission("setSpeakerphoneOn()")) {
        return;
    }

    if (on) {
        if (mForcedUseForComm == AudioSystem.FORCE_BT_SCO) {
                sendMsg(mAudioHandler, MSG_SET_FORCE_USE, SENDMSG_QUEUE,
                        AudioSystem.FOR_RECORD, AudioSystem.FORCE_NONE, null, 0);
        }
        mForcedUseForComm = AudioSystem.FORCE_SPEAKER;
    } else if (mForcedUseForComm == AudioSystem.FORCE_SPEAKER){
        mForcedUseForComm = AudioSystem.FORCE_NONE;
    }

    sendMsg(mAudioHandler, MSG_SET_FORCE_USE, SENDMSG_QUEUE,
            AudioSystem.FOR_COMMUNICATION, mForcedUseForComm, null, 0);
}
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这个方法默认是切换听筒与扬声器的，现在直接调用已经没有作用，需要在这里做修改，我们知道耳机与扬声器的声音是通过的底层codec的spk-con-gpio控制的，spk-con-gpio打开就是扬声器出声，spk-con-gpio关闭扬声器无声；耳机的声音控制通过另外一个管脚控制，如下图所示，所以我们就在底层驱动中加一个驱动控制这个开关，然后在setSpeakerphoneOn修改如下就行了。
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public void setSpeakerphoneOn(boolean on){
if (!checkAudioSettingsPermission("setSpeakerphoneOn()")) {
    return;
}

if (on) {
    if (mForcedUseForComm == AudioSystem.FORCE_BT_SCO) {
            sendMsg(mAudioHandler, MSG_SET_FORCE_USE, SENDMSG_QUEUE,
                    AudioSystem.FOR_RECORD, AudioSystem.FORCE_NONE, null, 0);
    }
    mForcedUseForComm = AudioSystem.FORCE_SPEAKER;
	set_speack_onoff("spkon");
} else if (mForcedUseForComm == AudioSystem.FORCE_SPEAKER){
    mForcedUseForComm = AudioSystem.FORCE_NONE;
	
set_speack_onoff("spkoff");
}

sendMsg(mAudioHandler, MSG_SET_FORCE_USE, SENDMSG_QUEUE,
        AudioSystem.FOR_COMMUNICATION, mForcedUseForComm, null, 0);
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}

第3步，各厂家根据自己的板子去实现set_speack_onoff这个接口就行了，也不是太复杂。