android - 如何检测蓝牙设备并从android应用程序获取检测到的设备的蓝牙地址

Question

我想检测蓝牙设备并从我的 android 应用程序中获取检测到的设备的蓝牙地址。我的任务是使用我的 android 应用程序中的蓝牙打印机打印账单。

Answer 1

对于蓝牙搜索 Activity ，您需要以下内容，

将权限添加到您的 AndroidManifest.xml

<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.BLUETOOTH" />

需要最低 API 级别 7 和 Android 2.1 版本。

Activity 类，onCreate()方法

private static BluetoothAdapter mBtAdapter;

// Register for broadcasts when a device is discovered
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
this.registerReceiver(mReceiver, filter);

// Register for broadcasts when discovery has finished
filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
this.registerReceiver(mReceiver, filter);


filter = new IntentFilter( BluetoothAdapter.ACTION_DISCOVERY_STARTED );
this.registerReceiver( mReceiver, filter );

// Get the local Bluetooth adapter
mBtAdapter = BluetoothAdapter.getDefaultAdapter();


if ( !mBtAdapter.isEnabled()) 
{
    Intent enableBtIntent = new Intent( BluetoothAdapter.ACTION_REQUEST_ENABLE );
    startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT );
}           

在相同的 Activity 中创建 BroadCastReceiver

private final BroadcastReceiver mReceiver = new BroadcastReceiver() 
{
    @Override
    public void onReceive(Context context, Intent intent) 
    {
        try
        {
            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);

                String deviceName = device.getName();
                String deviceAddress = device.getAddress();

                            System.out.println ( "Address : " + deviceAddress );
            } 
        }
        catch ( Exception e )
        {
            System.out.println ( "Broadcast Error : " + e.toString() );
        }
    }
};