android BLE扫描、连接、切断、添加蓝牙权限的代码

以下是Android BLE扫描、连接、切断、添加蓝牙权限的代码示例：

#### 添加蓝牙权限

在AndroidManifest.xml文件中添加以下蓝牙权限：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.bluetooth">

    <uses-feature android:name="android.hardware.bluetooth_le" android:required="true"/>
    <uses-permission android:name="android.permission.BLUETOOTH"/>
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

    <application
        ...
    </application>

</manifest>

#### 扫描BLE设备

private BluetoothAdapter bluetoothAdapter;
private BluetoothLeScanner bluetoothLeScanner;
private ScanCallback scanCallback;

// 初始化蓝牙适配器和扫描回调
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
bluetoothLeScanner = bluetoothAdapter.getBluetoothLeScanner();
scanCallback = new ScanCallback() {
    @Override
    public void onScanResult(int callbackType, ScanResult result) {
        super.onScanResult(callbackType, result);
        // 处理扫描结果
    }

    @Override
    public void onScanFailed(int errorCode) {
        super.onScanFailed(errorCode);
        // 处理扫描失败
    }
};

// 开始扫描BLE设备
ScanFilter scanFilter = new ScanFilter.Builder()
        .setDeviceName("MyDevice")
        .build();
List<ScanFilter> scanFilters = new ArrayList<>();
scanFilters.add(scanFilter);
ScanSettings scanSettings = new ScanSettings.Builder()
        .setScanMode(ScanSettings.SCAN_MODE_LOW_POWER)
        .build();
bluetoothLeScanner.startScan(scanFilters, scanSettings, scanCallback);

#### 连接BLE设备

private BluetoothGatt bluetoothGatt;

// 连接BLE设备
BluetoothDevice device = bluetoothAdapter.getRemoteDevice(deviceAddress);
bluetoothGatt = device.connectGatt(this, false, gattCallback);

// 处理连接回调
private final BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
    @Override
    public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
        super.onConnectionStateChange(gatt, status, newState);
        if (newState == BluetoothProfile.STATE_CONNECTED) {
            // 连接成功
            bluetoothGatt.discoverServices();
        } else {
            // 连接失败
            bluetoothGatt.close();
        }
    }

    @Override
    public void onServicesDiscovered(BluetoothGatt gatt, int status) {
        super.onServicesDiscovered(gatt, status);
        // 处理服务发现结果
    }

    @Override
    public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
        super.onCharacteristicRead(gatt, characteristic, status);
        // 处理读取特征值结果
    }

    @Override
    public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
        super.onCharacteristicWrite(gatt, characteristic, status);
        // 处理写入特征值结果
    }

    @Override
    public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
        super.onCharacteristicChanged(gatt, characteristic);
        // 处理特征值变化通知
    }
};

#### 切断BLE设备

// 断开BLE设备连接
bluetoothGatt.disconnect();

// 处理断开连接回调
private final BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
    @Override
    public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
        super.onConnectionStateChange(gatt, status, newState);
        if (newState == BluetoothProfile.STATE_DISCONNECTED) {
            // 断开连接成功
            bluetoothGatt.close();
        }
    }
};