Android藍牙詳解

一、Android藍牙強度

1、Android藍牙的強度是通過RSSI值來計算的，單位為dBm。

2、可以通過使用BluetoothDevice類中的getBondState()方法來獲取已連接設備的狀態信息。

3、獲取到設備的強度信息後，可以根據預設的閾值來判斷是否需要對連接進行優化，例如在連接強度低於一定值時，自動搜索周圍更強的藍牙信號，並連接相應的設備。

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

二、蘋果藍牙怎麼配對Android

1、打開蘋果設備的藍牙功能，確保可被發現；

2、在Android設備中搜索藍牙，並在搜索結果中選擇蘋果設備；

3、輸入蘋果設備的配對碼（可以在蘋果設備的藍牙設置中找到），完成與Android設備的配對。

三、Android藍牙打印模板

1、可以使用BluetoothAdapter的getDefaultAdapter()方法獲取默認的藍牙適配器；

2、確保藍牙已連接，獲取到已連接設備的BluetoothSocket對象；

3、將打印內容構造成byte數組，通過BluetoothSocket對象的OutputStream將內容發送到藍牙打印機中。

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

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

四、Android藍牙收發數據

1、首先要確保藍牙已連接，獲取到已連接設備的BluetoothSocket對象；

2、對於對設備的讀寫，需要使用BluetoothSocket對象的getInputStream()和getOutputStream()方法；

3、使用InputStream對象的read(bytes)方法從設備中讀取數據，使用OutputStream對象的write(bytes)方法向設備中寫入數據。

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("結束符")) {
        break;
    }
}

byte[] data = "要發送的數據".getBytes(Charset.forName("UTF-8"));
outputStream.write(data);
outputStream.flush();
outputStream.close();

五、Android藍牙連接並接收數據

1、需要使用BluetoothAdapter的getDefaultAdapter()方法獲取默認的藍牙適配器；

2、使用BluetoothAdapter對象的startDiscovery()方法搜索藍牙設備，並通過BroadcastReceiver接收設備搜索結果；

3、使用BluetoothDevice對象的createRfcommSocketToServiceRecord(uuid)方法，創建一個通信的Socket連接；

4、使用BluetoothSocket對象的connect()方法與設備建立連接；

5、使用BluetoothSocket對象的getInputStream()方法，接收設備返回的數據。

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("結束符")) {
        break;
    }
}
inputStream.close();
mBluetoothSocket.close();

六、Android藍牙傳輸數據

1、使用BluetoothAdapter的getDefaultAdapter()方法獲取默認的藍牙適配器；

2、使用BluetoothAdapter對象的startDiscovery()方法搜索藍牙設備，並通過BroadcastReceiver接收設備搜索結果；

3、掃描到設備後，使用BluetoothDevice對象的createRfcommSocketToServiceRecord(uuid)方法，創建一個通信的Socket連接；

4、使用BluetoothSocket對象的getInputStream()和getOutputStream()方法進行socket連接通信，並傳輸數據。

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 = "要發送的數據".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("結束符")) {
        break;
    }
}

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

七、Android藍牙通信

1、首先需要確定設備的藍牙已經開啟；

2、使用BluetoothAdapter的getDefaultAdapter()方法獲取默認的藍牙適配器；

3、首先需要為應用程序配對的藍牙設備創建一個接收線程，可通過繼承Thread實現；

4、通過BluetoothServerSocket類創建一個藍牙ServerSocket並開始監聽連接請求；

5、通過BluetoothSocket類獲取到連接上來的Socket對象，並使用getOutputStream()方法向設備中發送數據，使用getInputStream()方法接收來自設備的數據。

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("結束符")) {
                        break;
                    }
                }

                byte[] data = "回應的數據".getBytes(Charset.forName("UTF-8"));
                mOutputStream.write(data);
                mOutputStream.flush();

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

八、Android藍牙傳輸到iPhone

1、首先需要確定iPhone設備的藍牙已經開啟；