Android蓝牙详解

一、Android蓝牙强度

1、Android蓝牙的强度是通过RSSI值来计算的，单位为dBm。

2、可以通过使用BluetoothDevice类中的getBondState()方法来获取已连接设备的状态信息。

3、获取到设备的强度信息后，可以根据预设的阈值来判断是否需要对连接进行优化，例如在连接强度低于一定值时，自动搜索周围更强的蓝牙信号，并连接相应的设备。

BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothDevice mBluetoothDevice = mBluetoothAdapter.getRemoteDevice(deviceAddress);
int rssi = mBluetoothDevice.getRssi();
int bondState = mBluetoothDevice.getBondState();

二、苹果蓝牙怎么配对Android

1、打开苹果设备的蓝牙功能，确保可被发现；

2、在Android设备中搜索蓝牙，并在搜索结果中选择苹果设备；

3、输入苹果设备的配对码（可以在苹果设备的蓝牙设置中找到），完成与Android设备的配对。

三、Android蓝牙打印模板

1、可以使用BluetoothAdapter的getDefaultAdapter()方法获取默认的蓝牙适配器；

2、确保蓝牙已连接，获取到已连接设备的BluetoothSocket对象；

3、将打印内容构造成byte数组，通过BluetoothSocket对象的OutputStream将内容发送到蓝牙打印机中。

BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothDevice mBluetoothDevice = mBluetoothAdapter.getRemoteDevice(deviceAddress);
BluetoothSocket mBluetoothSocket = mBluetoothDevice.createRfcommSocketToServiceRecord(uuid);

OutputStream outputStream = mBluetoothSocket.getOutputStream();
byte[] data = "要打印的内容".getBytes(Charset.forName("UTF-8"));
outputStream.write(data);
outputStream.flush();
outputStream.close();

四、Android蓝牙收发数据

1、首先要确保蓝牙已连接，获取到已连接设备的BluetoothSocket对象；

2、对于对设备的读写，需要使用BluetoothSocket对象的getInputStream()和getOutputStream()方法；

3、使用InputStream对象的read(bytes)方法从设备中读取数据，使用OutputStream对象的write(bytes)方法向设备中写入数据。

BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothDevice mBluetoothDevice = mBluetoothAdapter.getRemoteDevice(deviceAddress);
BluetoothSocket mBluetoothSocket = mBluetoothDevice.createRfcommSocketToServiceRecord(uuid);

OutputStream outputStream = mBluetoothSocket.getOutputStream();
InputStream inputStream = mBluetoothSocket.getInputStream();

byte[] buffer = new byte[1024];
int bytes;
while (true) {
    bytes = inputStream.read(buffer);
    String data = new String(buffer, 0, bytes, Charset.forName("UTF-8"));
    if (data.contains("结束符")) {
        break;
    }
}

byte[] data = "要发送的数据".getBytes(Charset.forName("UTF-8"));
outputStream.write(data);
outputStream.flush();
outputStream.close();

五、Android蓝牙连接并接收数据

1、需要使用BluetoothAdapter的getDefaultAdapter()方法获取默认的蓝牙适配器；

2、使用BluetoothAdapter对象的startDiscovery()方法搜索蓝牙设备，并通过BroadcastReceiver接收设备搜索结果；

3、使用BluetoothDevice对象的createRfcommSocketToServiceRecord(uuid)方法，创建一个通信的Socket连接；

4、使用BluetoothSocket对象的connect()方法与设备建立连接；

5、使用BluetoothSocket对象的getInputStream()方法，接收设备返回的数据。

BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothDevice mBluetoothDevice = mBluetoothAdapter.getRemoteDevice(deviceAddress);
BluetoothSocket mBluetoothSocket = mBluetoothDevice.createRfcommSocketToServiceRecord(uuid);

mBluetoothAdapter.cancelDiscovery();
mBluetoothSocket.connect();

InputStream inputStream = mBluetoothSocket.getInputStream();

byte[] buffer = new byte[1024];
int bytes;
while (true) {
    bytes = inputStream.read(buffer);
    String data = new String(buffer, 0, bytes, Charset.forName("UTF-8"));
    if (data.contains("结束符")) {
        break;
    }
}
inputStream.close();
mBluetoothSocket.close();

六、Android蓝牙传输数据

1、使用BluetoothAdapter的getDefaultAdapter()方法获取默认的蓝牙适配器；

2、使用BluetoothAdapter对象的startDiscovery()方法搜索蓝牙设备，并通过BroadcastReceiver接收设备搜索结果；

3、扫描到设备后，使用BluetoothDevice对象的createRfcommSocketToServiceRecord(uuid)方法，创建一个通信的Socket连接；

4、使用BluetoothSocket对象的getInputStream()和getOutputStream()方法进行socket连接通信，并传输数据。

BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothDevice mBluetoothDevice = mBluetoothAdapter.getRemoteDevice(deviceAddress);
BluetoothSocket mBluetoothSocket = mBluetoothDevice.createRfcommSocketToServiceRecord(uuid);

mBluetoothAdapter.cancelDiscovery();
mBluetoothSocket.connect();

OutputStream outputStream = mBluetoothSocket.getOutputStream();
InputStream inputStream = mBluetoothSocket.getInputStream();

byte[] data = "要发送的数据".getBytes(Charset.forName("UTF-8"));
outputStream.write(data);
outputStream.flush();

byte[] buffer = new byte[1024];
int bytes;
while (true) {
    bytes = inputStream.read(buffer);
    String data = new String(buffer, 0, bytes, Charset.forName("UTF-8"));
    if (data.contains("结束符")) {
        break;
    }
}

inputStream.close();
outputStream.close();
mBluetoothSocket.close();

七、Android蓝牙通信

1、首先需要确定设备的蓝牙已经开启；

2、使用BluetoothAdapter的getDefaultAdapter()方法获取默认的蓝牙适配器；

3、首先需要为应用程序配对的蓝牙设备创建一个接收线程，可通过继承Thread实现；

4、通过BluetoothServerSocket类创建一个蓝牙ServerSocket并开始监听连接请求；

5、通过BluetoothSocket类获取到连接上来的Socket对象，并使用getOutputStream()方法向设备中发送数据，使用getInputStream()方法接收来自设备的数据。

public class BluetoothServerThread extends Thread {
    private BluetoothSocket mBluetoothSocket;
    private OutputStream mOutputStream;
    private InputStream mInputStream;

    public void run() {
        BluetoothServerSocket mBluetoothServerSocket = mBluetoothAdapter.listenUsingRfcommWithServiceRecord(name, uuid);

        while (true) {
            try {
                mBluetoothSocket = mBluetoothServerSocket.accept();
                mOutputStream = mBluetoothSocket.getOutputStream();
                mInputStream = mBluetoothSocket.getInputStream();

                byte[] buffer = new byte[1024];
                int bytes;
                while (true) {
                    bytes = mInputStream.read(buffer);
                    String data = new String(buffer, 0, bytes, Charset.forName("UTF-8"));
                    if (data.contains("结束符")) {
                        break;
                    }
                }

                byte[] data = "回应的数据".getBytes(Charset.forName("UTF-8"));
                mOutputStream.write(data);
                mOutputStream.flush();

                mInputStream.close();
                mOutputStream.close();
                mBluetoothSocket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

八、Android蓝牙传输到iPhone

1、首先需要确定iPhone设备的蓝牙已经开启；