Android 扫描附近的蓝牙设备并连接蓝牙音响的示例

写了一个可以扫描附近蓝牙设备的小demo，可以查看蓝牙设备的设备名和mac地址

代码量不多，很容易看懂

/**
 * 作者：叶应是叶
 * 时间：2017/9/8 20:13
 * 描述：
 */
public class scandeviceactivity extends appcompatactivity {

 private loadingdialog loadingdialog;

 private deviceadapter deviceadapter;

 private bluetoothadapter bluetoothadapter;

 private handler handler = new handler();

 private broadcastreceiver discoveryreceiver = new broadcastreceiver() {
  @override
  public void onreceive(context context, intent intent) {
   switch (intent.getaction()) {
    case bluetoothadapter.action_discovery_started:
     showloadingdialog("正在搜索附近的蓝牙设备");
     break;
    case bluetoothadapter.action_discovery_finished:
     toast.maketext(scandeviceactivity.this, "搜索结束", toast.length_short).show();
     hideloadingdialog();
     break;
    case bluetoothdevice.action_found:
     bluetoothdevice bluetoothdevice = intent.getparcelableextra(bluetoothdevice.extra_device);
     deviceadapter.adddevice(bluetoothdevice);
     deviceadapter.notifydatasetchanged();
     break;
   }
  }
 };


 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_scan_device);
  bluetoothmanager bluetoothmanager = (bluetoothmanager) getsystemservice(context.bluetooth_service);
  bluetoothadapter = bluetoothmanager.getadapter();
  if (bluetoothadapter == null) {
   toast.maketext(this, "当前设备不支持蓝牙", toast.length_short).show();
   finish();
  }
  initview();
  registerdiscoveryreceiver();
  startscan();
 }

 @override
 protected void ondestroy() {
  super.ondestroy();
  handler.removecallbacksandmessages(null);
  unregisterreceiver(discoveryreceiver);
  if (bluetoothadapter.isdiscovering()) {
   bluetoothadapter.canceldiscovery();
  }
 }

 private void initview() {
  listview lv_devicelist = (listview) findviewbyid(r.id.lv_devicelist);
  deviceadapter = new deviceadapter(this);
  lv_devicelist.setadapter(deviceadapter);
 }

 private void registerdiscoveryreceiver() {
  intentfilter intentfilter = new intentfilter();
  intentfilter.addaction(bluetoothadapter.action_discovery_started);
  intentfilter.addaction(bluetoothadapter.action_discovery_finished);
  intentfilter.addaction(bluetoothdevice.action_found);
  intentfilter.addaction(bluetoothdevice.action_bond_state_changed);
  registerreceiver(discoveryreceiver, intentfilter);
 }

 private void startscan() {
  if (!bluetoothadapter.isenabled()) {
   if (bluetoothadapter.enable()) {
    handler.postdelayed(new runnable() {
     @override
     public void run() {
      scandevice();
     }
    }, 1500);
   } else {
    toast.maketext(this, "请求蓝牙权限被拒绝，请授权", toast.length_short).show();
   }
  } else {
   scandevice();
  }
 }

 private void scandevice() {
  if (bluetoothadapter.isdiscovering()) {
   bluetoothadapter.canceldiscovery();
  }
  bluetoothadapter.startdiscovery();
 }

 private void showloadingdialog(string message) {
  if (loadingdialog == null) {
   loadingdialog = new loadingdialog(this);
  }
  loadingdialog.show(message, true, false);
 }

 private void hideloadingdialog() {
  if (loadingdialog != null) {
   loadingdialog.dismiss();
  }
 }

}

此外，还可以通过利用反射来调用系统api，从而与支持蓝牙a2dp协议的蓝牙音响连接上，不过因为我只有一部不算严格意义上的蓝牙音响来做测试，所以这个功能并不确定是否适用于大多数蓝牙设备

/**
 * 作者：叶应是叶
 * 时间：2017/9/8 20:02
 * 描述：
 */
public class connecta2dpactivity extends appcompatactivity {

 private deviceadapter deviceadapter;

 private bluetoothadapter bluetoothadapter;

 private handler handler = new handler();

 private bluetootha2dp bluetootha2dp;

 private loadingdialog loadingdialog;

 private final string tag = "connecta2dpactivity";

 private broadcastreceiver a2dpreceiver = new broadcastreceiver() {

  @override
  public void onreceive(context context, intent intent) {
   switch (intent.getaction()) {
    case bluetootha2dp.action_connection_state_changed:
     int connectstate = intent.getintextra(bluetootha2dp.extra_state, bluetootha2dp.state_disconnected);
     if (connectstate == bluetootha2dp.state_disconnected) {
      toast.maketext(connecta2dpactivity.this, "已断开连接", toast.length_short).show();
     } else if (connectstate == bluetootha2dp.state_connected) {
      toast.maketext(connecta2dpactivity.this, "已连接", toast.length_short).show();
     }
     break;
    case bluetootha2dp.action_playing_state_changed:
     int playstate = intent.getintextra(bluetootha2dp.extra_state, bluetootha2dp.state_not_playing);
     if (playstate == bluetootha2dp.state_playing) {
      toast.maketext(connecta2dpactivity.this, "处于播放状态", toast.length_short).show();
     } else if (playstate == bluetootha2dp.state_not_playing) {
      toast.maketext(connecta2dpactivity.this, "未在播放", toast.length_short).show();
     }
     break;
   }
  }
 };

 private broadcastreceiver discoveryreceiver = new broadcastreceiver() {
  @override
  public void onreceive(context context, intent intent) {
   switch (intent.getaction()) {
    case bluetoothadapter.action_discovery_started:
     showloadingdialog("正在搜索蓝牙设备，搜索时间大约一分钟");
     break;
    case bluetoothadapter.action_discovery_finished:
     toast.maketext(connecta2dpactivity.this, "搜索蓝牙设备结束", toast.length_short).show();
     hideloadingdialog();
     break;
    case bluetoothdevice.action_found:
     bluetoothdevice bluetoothdevice = intent.getparcelableextra(bluetoothdevice.extra_device);
     deviceadapter.adddevice(bluetoothdevice);
     deviceadapter.notifydatasetchanged();
     break;
    case bluetoothdevice.action_bond_state_changed:
     int status = intent.getintextra(bluetoothdevice.extra_bond_state, bluetoothdevice.bond_none);
     if (status == bluetoothdevice.bond_bonded) {
      toast.maketext(connecta2dpactivity.this, "已连接", toast.length_short).show();
     } else if (status == bluetoothdevice.bond_none) {
      toast.maketext(connecta2dpactivity.this, "未连接", toast.length_short).show();
     }
     hideloadingdialog();
     break;
   }
  }
 };

 private bluetoothprofile.servicelistener profileservicelistener = new bluetoothprofile.servicelistener() {

  @override
  public void onservicedisconnected(int profile) {
   if (profile == bluetoothprofile.a2dp) {
    toast.maketext(connecta2dpactivity.this, "onservicedisconnected", toast.length_short).show();
    bluetootha2dp = null;
   }
  }

  @override
  public void onserviceconnected(int profile, final bluetoothprofile proxy) {
   if (profile == bluetoothprofile.a2dp) {
    toast.maketext(connecta2dpactivity.this, "onserviceconnected", toast.length_short).show();
    bluetootha2dp = (bluetootha2dp) proxy;
   }
  }
 };

 private adapterview.onitemclicklistener itemclicklistener = new adapterview.onitemclicklistener() {
  @override
  public void onitemclick(adapterview<?> parent, view view, int position, long id) {
   bluetoothdevice device = deviceadapter.getdevice(position);
   if (device.getbondstate() == bluetoothdevice.bond_bonded) {
    toast.maketext(connecta2dpactivity.this, "已连接该设备", toast.length_short).show();
    return;
   }
   showloadingdialog("正在连接");
   connecta2dp(device);
  }
 };


 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_connect_a2dp);
  bluetoothmanager bluetoothmanager = (bluetoothmanager) getsystemservice(context.bluetooth_service);
  bluetoothadapter = bluetoothmanager.getadapter();
  if (bluetoothadapter == null || !getpackagemanager().hassystemfeature(packagemanager.feature_bluetooth_le)) {
   toast.maketext(connecta2dpactivity.this, "当前设备不支持蓝牙", toast.length_short).show();
   finish();
  }
  bluetoothadapter.getprofileproxy(this, profileservicelistener, bluetoothprofile.a2dp);
  initview();
  registerdiscoveryreceiver();
  registera2dpreceiver();
  startscan();
 }

 @override
 protected void ondestroy() {
  super.ondestroy();
  handler.removecallbacksandmessages(null);
  unregisterreceiver(a2dpreceiver);
  unregisterreceiver(discoveryreceiver);
  if (bluetoothadapter.isdiscovering()) {
   bluetoothadapter.canceldiscovery();
  }
 }

 private void initview() {
  listview lv_devicelist = (listview) findviewbyid(r.id.lv_devicelist);
  deviceadapter = new deviceadapter(this);
  lv_devicelist.setadapter(deviceadapter);
  lv_devicelist.setonitemclicklistener(itemclicklistener);
 }

 private void registerdiscoveryreceiver() {
  intentfilter intentfilter = new intentfilter();
  intentfilter.addaction(bluetoothadapter.action_discovery_started);
  intentfilter.addaction(bluetoothadapter.action_discovery_finished);
  intentfilter.addaction(bluetoothdevice.action_found);
  intentfilter.addaction(bluetoothdevice.action_bond_state_changed);
  registerreceiver(discoveryreceiver, intentfilter);
 }

 private void registera2dpreceiver() {
  intentfilter intentfilter = new intentfilter();
  intentfilter.addaction(bluetootha2dp.action_connection_state_changed);
  intentfilter.addaction(bluetootha2dp.action_playing_state_changed);
  registerreceiver(a2dpreceiver, intentfilter);
 }

 private void startscan() {
  if (!bluetoothadapter.isenabled()) {
   if (bluetoothadapter.enable()) {
    handler.postdelayed(new runnable() {
     @override
     public void run() {
      scandevice();
     }
    }, 1500);
   } else {
    toast.maketext(connecta2dpactivity.this, "请求蓝牙权限被拒绝", toast.length_short).show();
   }
  } else {
   scandevice();
  }
 }

 private void scandevice() {
  if (bluetoothadapter.isdiscovering()) {
   bluetoothadapter.canceldiscovery();
  }
  bluetoothadapter.startdiscovery();
 }

 public void setpriority(bluetoothdevice device, int priority) {
  try {
   method connectmethod = bluetootha2dp.class.getmethod("setpriority", bluetoothdevice.class, int.class);
   connectmethod.invoke(bluetootha2dp, device, priority);
  } catch (exception e) {
   e.printstacktrace();
  }
 }

 private void connecta2dp(bluetoothdevice bluetoothdevice) {
  if (bluetootha2dp == null || bluetoothdevice == null) {
   return;
  }
  setpriority(bluetoothdevice, 100);
  try {
   method connectmethod = bluetootha2dp.class.getmethod("connect", bluetoothdevice.class);
   connectmethod.invoke(bluetootha2dp, bluetoothdevice);
  } catch (exception e) {
   e.printstacktrace();
  }
 }

 private void showloadingdialog(string message) {
  if (loadingdialog == null) {
   loadingdialog = new loadingdialog(this);
  }
  loadingdialog.show(message, true, false);
 }

 private void hideloadingdialog() {
  if (loadingdialog != null) {
   loadingdialog.dismiss();
  }
 }

}

这里给出源代码供大家参考：bluetoothdemo

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。