实现方式一：只能在程序为前台时监控

在Activity中即可监听

@Overridepublic boolean onKeyUp(int keyCode, KeyEvent event) {    Log.i("MainActivity-onKeyUp", "" + keyCode);    switch (keyCode) {        case KeyEvent.KEYCODE_HEADSETHOOK:            Toast.makeText(MainActivity.this, "Pause_Up", Toast.LENGTH_SHORT).show();            return false;    }    return super.onKeyUp(keyCode, event);}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {    Log.i("MainActivity-onKeyDown", "" + keyCode);    switch (keyCode) {        case KeyEvent.KEYCODE_HEADSETHOOK:            Toast.makeText(MainActivity.this, "Pause_Down", Toast.LENGTH_SHORT).show();            return false;    }    return super.onKeyUp(keyCode, event);}

实现方式二：前后台均可

1.自定义Receiver

public class EarphoneReceiver extends BroadcastReceiver {    public EarphoneReceiver() {    }    @Override    public void onReceive(Context context, Intent intent) {        KeyEvent event = intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);        if (event.getAction() == KeyEvent.ACTION_UP) {             TODO: 2016/2/18 0018 按下时操作            Message msg = Message.obtain();            msg.what = 100;            handler.sendMessage(msg);        }    }    Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            switch (msg.what) {                case 100:                     TODO: 2016/2/18 0018  操作                    EarphoneButtonHelper.EarphoneListener listener = EarphoneButtonHelper.getInstance().getListener();                    if (listener != null) {                        listener.onClick();                    }                    break;            }        }    };}

AndroidManifast.xml中注册

2.注册/取消Receiver

/** * 取消广播接收器 * @param context */public void unrigisterReceiver(Context context) {    AudioManager mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);    ComponentName name = new ComponentName(context.getPackageName(), EarphoneReceiver.class.getName());    mAudioManager.unregisterMediaButtonEventReceiver(name);}/** * 注册广播接收器 * @param context */public void registerReceiver(Context context) {    AudioManager mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);    ComponentName name = new ComponentName(context.getPackageName(), EarphoneReceiver.class.getName());    mAudioManager.registerMediaButtonEventReceiver(name);}

其他

参考文章