发现Android中可用的蓝牙设备 [英] Discovering available bluetooth devices in android

问题描述

我刚刚开始学习Android开发。我正在写一个Android程序扫描可用的蓝牙设备，并列出它们在日志文件中。由于我是新来的Andr​​oid，我无法弄清楚什么是错在下面的code段。

  button2.setOnClickListener（新View.OnClickListener（）
        {
            公共无效的onClick（视图v）
            {
                ListView控件LV1 =（ListView控件）findViewById（R.id.myListView1）;
                BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter（）;


                最后的BroadcastReceiver mReceiver =新的BroadcastReceiver（）
                {
                    公共无效的onReceive（上下文的背景下，意图意图）
                    {
                        串动= intent.getAction（）;
                        //当发现找到的设备
                        如果（BluetoothDevice.ACTION_FOUND.equals（动作））
                        {
                        //从意图获取BluetoothDevice类对象
                        BluetoothDevice类设备= intent.getParcelableExtra（
                        BluetoothDevice.EXTRA_DEVICE）;
                        Log.v（蓝牙测试，device.getName（）+\ N
                        + device.getAddress（））;
                        }
                    }
                };

                字符串aDiscoverable = BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE;
                startActivityForResult（新意图（aDiscoverable），DISCOVERY_REQUEST）;
                IntentFilter的过滤器=新的IntentFilter（BluetoothDevice.ACTION_FOUND）;
                registerReceiver（mReceiver，过滤器）;
                mBluetoothAdapter.startDiscovery（）;
            }
        }）;
 

当我尝试调试模式下，控制跳过的BroadcastReceiver（）。我找不到日志中的任何条目。你能不能帮我搞清楚的问题是什么，以及如何我可以列出可用的蓝牙设备。

我收到错误的应用程序意外停止：

  logcat的错误：
10-28 20：08：24.201：ERROR / UpdateReceiver（914）：ACTION_PACKAGE_REMOVED
10-28 20：08：28.415：ERROR / RequestPermissionActivity（431）：超时= 120
10-28 20：08：44.291：ERROR / DTUN_HCID4（521）：=== dtunops_stop_discovery（）===
 

解决方案

您应该具备蓝牙和BLUETOOTH_ADMIN权限您的清单

I just started learning Android development. I am writing an Android program to scan available bluetooth devices and list them in a log file. As I am new to Android, I am unable to figure out what is wrong in the below code snippet.

 button2.setOnClickListener(new View.OnClickListener() 
        {
            public void onClick(View v) 
            {
                ListView lv1 = (ListView) findViewById(R.id.myListView1);
                BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();


                final BroadcastReceiver mReceiver = new BroadcastReceiver() 
                { 
                    public void onReceive(Context context, Intent intent) 
                    {
                        String action = intent.getAction(); 
                        // When discovery finds a device 
                        if (BluetoothDevice.ACTION_FOUND.equals(action)) 
                        {
                        // Get the BluetoothDevice object from the Intent 
                        BluetoothDevice device = intent.getParcelableExtra(
                        BluetoothDevice.EXTRA_DEVICE);
                        Log.v("BlueTooth Testing",device.getName() + "\n"
                        + device.getAddress()); 
                        }
                    }    
                };

                String aDiscoverable = BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE;
                startActivityForResult(new Intent(aDiscoverable),DISCOVERY_REQUEST);
                IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND); 
                registerReceiver(mReceiver, filter); 
                mBluetoothAdapter.startDiscovery();
            }
        });

When I try the debug mode, the control skips the "BroadcastReceiver()". I could not find any entries in the log. Can you help me in figuring out what the problem is and how I can list the available bluetooth devices.

[edit] I am getting error that the application has stopped unexpectedly:

Logcat Errors:
10-28 20:08:24.201: ERROR/UpdateReceiver(914): ACTION_PACKAGE_REMOVED
10-28 20:08:28.415: ERROR/RequestPermissionActivity(431): Timeout = 120
10-28 20:08:44.291: ERROR/DTUN_HCID4(521): === dtunops_stop_discovery() ===

解决方案

You should have the BLUETOOTH and BLUETOOTH_ADMIN permissions in your manifest

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