我想在Android应用中更改声音设备输出。我想在耳机插入时使用手机的扬声器。
我尝试将AudioManager类audioManager.setSpeakerphoneOn(true);
中的setSpeakerphoneOn与audioManager.setMode(AudioManager.MODE_IN_CALL);
一起使用,但我不想设置MODE_IN_CALL!我想留在MODE_NORMAL。
我在AudioSystem类中搜索,我找到了一个应用程序“SoundAbout”,它就是这样做的。您可以为媒体音频选择扬声器,模式保持在NORMAL状态。
所以我在AudioSystem中尝试setDeviceConnectionState
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(AVAILABLE),我无法通过扬声器播放声音。
如何在不进入MODE_IN_CALL的情况下将DEVICE_OUT_WIRED_HEADPHONE设置为0或通过扬声器播放声音?
谢谢,抱歉我的英文不好!
答案 0 :(得分:7)
我试试这个,它适合我的情况:
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)
来禁用有线耳机。
限制:即使已插入耳机,AudioManager.isWiredHeadsetOn()
也会返回false。