Question

定义：

我的非Android设备（NAD）是一个蓝牙设备，它将其名称从60转为0并以无限方式重置。

目标：我尝试做的是让我的Android设备尽可能地检测到倒计时并发出尽可能接近NAD计数器的警报。

我通过将设备的原生BluetoothAdapter设置为启动发现（）手动将该功能连接到屏幕按钮并密切关注我通过BroadcastReceiver设置的祝酒来实现这一点，这会更新屏幕Textviews使我能够监控我的设备实时接收的内容

需要量：系统＆amp;在这种情况下，资源效率不是一个问题。

问题:(密切注意代码中的第1部分和第2部分）我不确定使用fetchUuidsWithSdp（）是如何帮助我的，因为TextView它的更新仍然是空的，而且意外返回操作的EXTRA_NAME额外填充了Textview ACTION_NAME_CHANGED是缓存的初始发现名称（即。我的应用程序在初始发现后没有读取名称。）

我的代码可以在下面找到

对不起任何新手的错误，我都在努力：）

    public class BTBroadcastReceiver extends BroadcastReceiver{

        @Override
        public void onReceive(Context context, Intent intent) {
            //pulling the action name from the broadcasted intent
            String action = intent.getAction();
            if(BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)){
                sToaster("StartedD");//show toast that Discovery has started

            }
            else if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){
                sToaster("EndedD");//show toast signifying end of discovery
                /*
                if(notfound){
                    mBTAdapter.startDiscovery();
                }*/
            }
            else if(BluetoothDevice.ACTION_FOUND.equals(action)){
                //when a device is found
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                //make sure it's indeed my NAD device by checking MAC address
                if(device.getAddress().equals(MACAddress)){
                    if(notfound){
                        //show device name on screen
                        sToaster("FOUND DEvice");
                        notfound = false;
                        NAD = device;
                        NameShower.setText(device.getName());
                    }
                    else{
                        //do nothing if it's the second time the device is found
                    }
                }
            }
            else if(BluetoothDevice.ACTION_NAME_CHANGED.equals(action)){
                //name changed
                BluetoothDevice foundDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                //make sure it's indeed my NAD device
                if(foundDevice.equals(NAD)){
                    sToaster("Name Change!"); //show on screen that the name change intent has been caught

                    //PART1
                    //to prevent caching of the old device name StackOverflow article 
                    //advised using this function i don't totally understand yet
                    //NAD.fetchUuidsWithSdp();
                    //either commented or not commented the outcome is the same (no refresh of the name)



                    //PART2
                    //tried showing the new name two different ways below, neither of which are effective
                    //by inspecting the TextViews on-screen
                    NameShower.setText(foundDevice.getName());
                    EventView.setText(intent.getStringExtra(BluetoothDevice.EXTRA_NAME));
                    }
                }
            }

    };

Answer 1

我参与了一个蓝牙项目，我认为发现过程应该是一个可以在后台注册的Intent。要发现范围内的设备，您只需要调用BTDevice.startDiscovery（）来搜索它们。通常，如果连续启用，startDiscovery（）会耗尽电池电量。如果您愿意，我可以编辑此帖子以共享我用于扫描设备的snipet。希望这有帮助！

使用fetchUuidsWithSdp（）来防止友好名称缓存

1 个答案: