android 耳机连接状态查询

近期有个要监听耳机的需求，本以为挺简单，三五行调用个系统方法就能解决了。结果发现还有点复杂，考虑到这块妥妥是一个模块的东西，自己四处查了一些资料后，去伪存真，最终总算整理出了可以直接使用的内容。记录下来，以资来者。

耳机样式分为有线和无线两种，而且需要动态监控当前耳机状态，所以要对察插入时间进行监听，有线耳机的接入是有广播的，而无线耳机就没有了，需要做个简单的轮询处理。

有线耳机插拔状态静态查询

AudioManager提供了isWiredHeadsetOn来查看当前耳机状态。

调用实现

    private boolean isWiredHeadsetOn() {AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);if (audioManager == null) {return false;}Log.d(TAG, "isWiredHeadsetOn=" + audioManager.isWiredHeadsetOn());return audioManager.isWiredHeadsetOn();}

当你把这段代码贴到工程中时，该方法会显示已被废弃，看了一下接口说明，建议使用getDevices来查看。

Google源码注释

    /* Returns an array of {@link AudioDeviceInfo} objects corresponding to the audio devices* currently connected to the system and meeting the criteria specified in the* <code>flags</code> parameter.* @param flags A set of bitflags specifying the criteria to test.* @see #GET_DEVICES_OUTPUTS* @see #GET_DEVICES_INPUTS* @see #GET_DEVICES_ALL* @return A (possibly zero-length) array of AudioDeviceInfo objects.*/public AudioDeviceInfo[] getDevices(@AudioDeviceRole int flags) {return getDevicesStatic(flags);}

其中有线耳机大概看了下应该是TYPE_WIRED_HEADSET，TYPE_USB_HEADSET，由于实在是没有这种USB耳机，没法测试3和22是否有包含关系，所以就摆出来看看吧。

Google源码注释

    /* A device type describing a headset, which is the combination of a headphones and microphone.*/public static final int TYPE_WIRED_HEADSET    = 3;/* A device type describing a USB audio headset.*/public static final int TYPE_USB_HEADSET       = 22;

通过getDevices获得到当前设备连接设备列表，长度不为0即有耳机连接。

有线耳机插拔状态动态监听

有线耳机插拔时会触发广播Intent.ACTION_HEADSET_PLUG,只需要在需要的地方监听该广播即可。广播中会带有state字段，该值为1即时耳机插入，否则为拔出。

Google源码注释

    /* Broadcast Action: Wired Headset plugged in or unplugged. You <em>cannot</em> receive this through components declared* in manifests, only by explicitly registering for it with* {@link Context#registerReceiver(BroadcastReceiver, IntentFilter)* Context.registerReceiver()}. <p>The intent will have the following extra values:* <ul>*   <li><em>state</em> - 0 for unplugged, 1 for plugged. </li>*   <li><em>name</em> - Headset type, human readable string </li>*   <li><em>microphone</em> - 1 if headset has a microphone, 0 otherwise </li>* </ul>* </ul>*/@SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)public static final String ACTION_HEADSET_PLUG ="android.intent.action.HEADSET_PLUG";

调用实现

    // 监听耳机插入IntentFilter intentFilter = new IntentFilter(Intent.ACTION_HEADSET_PLUG);intentFilter.addAction("android.media.VOLUME_CHANGED_ACTION");BroadcastReceiver mReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();if (Intent.ACTION_HEADSET_PLUG.equals(action)) {if (intent.hasExtra("state")) {if (intent.getIntExtra("state", 0) == 1) {Toast.makeText(AudioManagerTest.this, "插入耳机", Toast.LENGTH_LONG).show();} else {Toast.makeText(AudioManagerTest.this, "拔出耳机", Toast.LENGTH_LONG).show();}}}}};registerReceiver(mReceiver, intentFilter);

无线耳机插拔状态静态查询

AudioManager提供了isBluetoothScoOn来查看当前蓝牙耳机状态，但是调用后有些识别失败，查了其他小伙伴的博客后发现还得加上isBluetoothA2dpOn这个方法才行。查了下这两个后缀好像是蓝牙制式不同的区别，两个取或就可以了。

调用实现

    private boolean isBluetoothHeadsetOn() {AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);if (audioManager == null) {return false;}Log.d(TAG, "isBluetoothScoOn=" + audioManager.isBluetoothScoOn() + " " +"isBluetoothA2dpOn=" + audioManager.isBluetoothA2dpOn());return audioManager.isBluetoothScoOn() || audioManager.isBluetoothA2dpOn();}

同样的isBluetoothA2dpOn也会被列为废弃，使用TYPE_BLUETOOTH_SCO和TYPE_BLUETOOTH_A2DP调用getDevices即可。

Google源码注释

    /* A device type describing a Bluetooth device typically used for telephony.*/public static final int TYPE_BLUETOOTH_SCO    = 7;/* A device type describing a Bluetooth device supporting the A2DP profile.*/public static final int TYPE_BLUETOOTH_A2DP   = 8;

无线耳机插拔状态动态监听

无线耳机的连接我没找到广播通知，将就用个轮询进行处理了。

调用实现

    // 定时检查蓝牙连接new Thread(() -> {while (true) {if (isBluetoothHeadsetOn()) {runOnUiThread(() -> Toast.makeText(AudioManagerTest.this, "插入蓝牙耳机", Toast.LENGTH_LONG).show());}try {Thread.sleep(10 * 1000);} catch (InterruptedException e) {e.printStackTrace();}}}).start();

拿走直接用的源码

com.example.developerlab.AudioManagerTest