Android :强制音频路由

Question

我想改变我的Android应用程序的声音设备输出。耳机插上时，我想用电话的扬声器。

我尝试过在setSpeakerphoneOn中使用AudioManager类audioManager.setSpeakerphoneOn(true);和audioManager.setMode(AudioManager.MODE_IN_CALL);，但是我不想设置MODE_IN_CALL！我想留在MODE_NORMAL。

我搜索了AudioSystem类，并找到了一个名为"SoundAbout“的应用程序。您可以为媒体音频选择扬声器，模式保持在正常状态。

因此，我尝试了setDeviceConnectionState in AudioSystem，将DEVICE_OUT_WIRED_HEADPHONE设置为0，但它不起作用。当我检查DEVICE_OUT_WIRED_HEADPHONE的状态时，它总是设置为1(可用)，我不能通过扬声器播放声音。

如何将DEVICE_OUT_WIRED_HEADPHONE设置为0或通过扬声器播放声音而不使用MODE_IN_CALL？

感谢并为我糟糕的英语道歉！

Answer 1

我试了一下，这对我的案子有用：

class AudioSystem {

private static final int REFLECTION_ERROR = -999;

private static final String DEVICE_OUT_SPEAKER          = "DEVICE_OUT_SPEAKER";
private static final String DEVICE_OUT_EARPIECE         = "DEVICE_OUT_EARPIECE";
private static final String DEVICE_OUT_WIRED_HEADPHONE  = "DEVICE_OUT_WIRED_HEADPHONE";


Class<?> mAudioSystem;

protected AudioSystem() {

    try {
        mAudioSystem = Class.forName("android.media.AudioSystem");
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    }

}

private int getConstantValue(String s) {

    try {
        return ((Integer)mAudioSystem.getDeclaredField(s).get(int.class)).intValue();
    } catch (Exception e) {
        e.printStackTrace();
    }

    return REFLECTION_ERROR;

}


private int setDeviceConnectionState(int i, int j, String s) {

    try {
        return (Integer) mAudioSystem.getMethod("setDeviceConnectionState", int.class, int.class, String.class).invoke(mAudioSystem, i, j, s);
    } catch (Exception e) {
        e.printStackTrace();
    }

    return REFLECTION_ERROR;
}

private int setDeviceConnectionState(String deviceName, Boolean state) {
    return setDeviceConnectionState(getConstantValue(deviceName), (state ? 1 : 0), "");
}

private void forceWiredHeadphonesMedia() {
    setDeviceConnectionState(DEVICE_OUT_WIRED_HEADPHONE, true);
    setDeviceConnectionState(DEVICE_OUT_SPEAKER, false);
}


private void forceSpeakerMedia() {
    setDeviceConnectionState(DEVICE_OUT_SPEAKER, true);
    setDeviceConnectionState(DEVICE_OUT_EARPIECE, true);
    setDeviceConnectionState(DEVICE_OUT_WIRED_HEADPHONE, false);
    setDeviceConnectionState(DEVICE_OUT_SPEAKER, true);
}

public void setSpeakerOn(Boolean state) {
    if (state) {
        forceSpeakerMedia();
    } else {
        forceWiredHeadphonesMedia();
    }
}

}

我使用setSpeakerOn(true)禁用有线耳机。

限制：AudioManager.isWiredHeadsetOn()返回false，甚至连耳机都插上了。