Question

我很确定至少有两个设备可以通过蓝牙解决，但我的应用程序只显示配对。我已经给了蓝牙许可，我不明白问题出在哪里。你能找到吗？

create table IF NOT EXISTS RequestTable (
  rtTicketId bigserial unique not null AUTO_INCREMENT, 
  primary key (rtTicketId));

create table IF NOT EXISTS Vm (
  vmId bigserial unique not null AUTO_INCREMENT, 
  primary key (vmId),
  foreign key (rtTicketId) references RequestTable(rtTicketId));

create table IF NOT EXISTS Db (
  dbId bigserial unique not null AUTO_INCREMENT, 
  rtTicketId bigserial unique not null,
  primary key (dbId),
  foreign key (rtTicketId) references RequestTable(rtTicketId));

Answer 1

如果我没有错，你只能获得保税装置。您的代码应该如下所示。

IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
void startScan(){
adapter.clear();                                    //List View cleared
deviceList = btAdapter.getBondedDevices();          //Paired Device
for (BluetoothDevice bd : deviceList)               //Adding Paired Device
    adapter.add(bd.getName() + "\n" + bd.getAddress()+"\t (Paired)");
//Broadcast Receiver Registration

检查蓝牙启用

(!btAdapter.isEnabled()) {
        Intent BtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        startActivityForResult(BtIntent, 0);
        Toast.makeText(BluetoothScannerActivity.this, "Turning on Bluetooth", Toast.LENGTH_LONG).show();
    }
 else{
registerReceiver(receiver,filter);
btAdapter.startDiscovery();                         //Scan start
}
}

你的广播应该是方法，它的更好的parctice

receiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action  = intent.getAction();
        if(BluetoothDevice.ACTION_FOUND.equals(action)){        //Device Found
            BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);   //Extractind Device Info
            adapter.add(device.getName()+"\t"+device.getAddress());                             //Adding Device to List View
        }
    }
};

 @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == BtIntent && resultCode == RESULT_OK) {
    registerReceiver(receiver,filter);
    btAdapter.startDiscovery(); 
    }
 }

蓝牙探索Android中的问题

1 个答案: