为什么BluetoothAdapter.startDiscovery（..）需要获得蓝牙设备播放？ [英] Why BluetoothAdapter.startDiscovery(..) require to get Bluetooth device broadcast?

问题描述

通常情况下如何Android的广播工作是：应用程序必须创建广播接收器，并有注册意向的行动为它想获得接收事件

。

但在蓝牙设备发现/扫描的情况下，为什么它需要通过请求调用的 BluetoothAdapter.startDsiccovery（）

基本上，我想通过万岁服务在后台运行。

任何一个有想法吗？

解决方案

 私人无效listenPairedDevice（）{
按钮listenBtn =（按钮）findViewById（R.id.button_listen）;
listenBtn.setOnClickListener（新OnClickListener（）{
  公共无效的onClick（查看视图）{
    意图盘=新意图（BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE）;
    startActivityForResult（光盘，DISCOVERY_REQUEST）;
 }
 }）;
}
@覆盖
 保护无效的onActivityResult（INT申请code，INT结果code，意图数据）{
 如果（要求code == DISCOVERY_REQUEST）{
布尔isDiscoverable =结果code＆GT; 0;
 如果（isDiscoverable）{
 字符串名称=bluetoothserver;
 尝试{
最后BluetoothServerSocket btserver = bluetooth.listenUsingRfcommWithServiceRecord（名称，UUID）;
      AsyncTask的＆LT;整型，无效的BluetoothSocket＆GT; acceptThread =新的AsyncTask＆LT;整型，无效的BluetoothSocket＆GT;（）{        @覆盖
        受保护的BluetoothSocket doInBackground（整数... PARAMS）{
          尝试{             插座= btserver.accept（）;
            返回插座;
             }赶上（IOException异常五）{
            Log.d（蓝牙，e.getMessage（））;
          }
          最后{
            //关闭声明中后来又增加由MR
              尝试{
              btserver.close（）;
              }赶上（IOException异常五）{              }
          }
          返回null;
        }        @覆盖
        保护无效onPostExecute（的BluetoothSocket结果）{
          如果（结果！= NULL）
            changeLayout（）;
        }
      };
      acceptThread.execute（结果code）;
    }赶上（IOException异常五）{
      Log.d（蓝牙，e.getMessage（））;
    }
  }
}
 

Normally how Android Broadcast work is: app have to create BroadcastReceiver and have to register action intent for it want to get receive event.

But in case of Bluetooth device discovery/scanning why it required request call through BluetoothAdapter.startDsiccovery().

Basically I want to dicover BLE device through long live Service running in Background.

Any one have idea here?

解决方案

private void listenPairedDevice() {
Button listenBtn = (Button)findViewById(R.id.button_listen);
listenBtn.setOnClickListener(new OnClickListener() {
  public void onClick(View view) {
    Intent disc = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
    startActivityForResult(disc, DISCOVERY_REQUEST);     
 }
 });
}
@Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 if (requestCode == DISCOVERY_REQUEST) {
boolean isDiscoverable = resultCode > 0;
 if (isDiscoverable) {
 String name = "bluetoothserver";
 try {
final BluetoothServerSocket btserver = bluetooth.listenUsingRfcommWithServiceRecord(name, uuid);


      AsyncTask<Integer, Void, BluetoothSocket> acceptThread = new AsyncTask<Integer, Void, BluetoothSocket>() {

        @Override
        protected BluetoothSocket doInBackground(Integer... params) {
          try {

             socket = btserver.accept();
            return socket;
             } catch (IOException e) {
            Log.d("BLUETOOTH", e.getMessage());            
          }
          finally {
            //close statement added later by MR
              try{
              btserver.close();
              } catch (IOException e){

              }
          }
          return null;
        }

        @Override
        protected void onPostExecute(BluetoothSocket result) {
          if (result != null)
            changeLayout();
        }            
      };          
      acceptThread.execute(resultCode);
    } catch (IOException e) {
      Log.d("BLUETOOTH", e.getMessage());            
    }
  }
}

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