Java 从Android蓝牙设备选择器获取蓝牙设备信息

我正在开发一个Android应用程序，其中包括向用户显示附近蓝牙设备的列表，并连接到他们选择的设备。我正在尝试使用系统蓝牙设备选择器，如以下帖子所示：

设备选择器确实显示，但我无法找出代码中选择的设备。

onReceive

中的祝酒词不显示，这表明没有收到广播

我面临的另一个问题是，如果我尝试在请求权限Result中启动设备选取器活动，则设备选取器根本不会显示，尽管在请求权限对话框中单击了“允许”。里面的吐司也没有展示出来

代码如下：

//Code inside Fragment
BroadcastReceiver mReceiver;
BluetoothAdapter bluetoothAdapter;
BluetoothSocket bsock;


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    myView = inflater.inflate(R.layout.controller_mode_layout,container,false);

     bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); 
//Get location access permission.
    if (bluetoothAdapter != null) {
        if (bluetoothAdapter.isEnabled()) {
            ActivityCompat.requestPermissions(getActivity(),new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, reqCode);
        }
    }
//Receiver to get the selected device information 
    mReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
                context.unregisterReceiver(this);
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            Toast.makeText(context,"Device"+device.getAddress(), Toast.LENGTH_SHORT).show();
            try {
                bsock=device.createRfcommSocketToServiceRecord(UUID.fromString("00002415-0000-1000-8000-00805F9B34FB"));
                bsock.connect();
                //Send and receive data logic follows

            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    };
    getActivity().registerReceiver(mReceiver, new IntentFilter("android.bluetooth.devicepicker.action.DEVICE_SELECTED"));

    showDevicePicker();

    return myView;
}



@Override
public void onRequestPermissionsResult (int requestCode, String[] permissions, int[] grantResults)
{
    Toast.makeText(getActivity(),"Permission result", Toast.LENGTH_SHORT).show();
    if((requestCode == reqCode) && (grantResults[0] == PackageManager.PERMISSION_GRANTED))
    {
        //Not working
       // showDevicePicker();
    }
}

public void showDevicePicker()
{
    //Launch built in bluetooth device picker activity
    startActivity( new Intent("android.bluetooth.devicepicker.action.LAUNCH")
            .putExtra("android.bluetooth.devicepicker.extra.NEED_AUTH", false)
            .putExtra("android.bluetooth.devicepicker.extra.FILTER_TYPE", 0)
            .putExtra("android.bluetooth.devicepicker.extra.LAUNCH_PACKAGE","com.example.ankit2.controllerapp1")
            .putExtra("android.bluetooth.devicepicker.extra.DEVICE_PICKER_LAUNCH_CLASS","com.example.ankit2.controllerapp1.Fragment1")
            .setFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS));

}

任何帮助都将不胜感激

---

注意：我在运行棉花糖的Lenovo K3 Note上测试了代码。

问题出在

设备\u PICKER\u LAUNCH\u类

，该类被指定为

碎片1

。启动类必须是活动，即使广播接收器位于片段内部。在这种情况下，将启动类更改为

ControllerActivity

（其中包含片段

Fragment1

）修复了问题