如何检测蓝牙设备，并得到检测设备从Android应用程序的蓝牙地址

问题描述

我要的检测蓝牙设备，并从我的Andr​​oid应用程序获取检测设备的蓝牙地址。我的任务是通过使用蓝牙打印机从我的Andr​​oid应用程序，打印账单。

I want to the detect bluetooth device and get the bluetooth address of detected device from my android app . My task is to print a bill by using Bluetooth printer from my android app .

推荐答案

有关您需要下面的东西蓝牙搜索活动，

For the Bluetooth Searching Activity you require following things,

在添加权限到您的Andr​​oidManifest.xml

Add Permissions in to your AndroidManifest.xml

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

最低API级别7和Android 2.1的版本是必需的。

Minimum API level 7 and Android 2.1 version is required.

活动类，的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 );
}

创建的BroadcastReceiver 同一活动

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() );
        }
    }
};

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