Android蓝牙学习——搜索、配对、传文件（附源码）

导语

蓝牙作为一种成熟、低功耗无线通信技术的先锋，在可穿戴设备领域中扮演着越来越重要的作用。目前流行的蓝牙成功案例在运动手环、行车记录仪、终端解锁、智能家居等领域。接下来，一起动手敲代码吧~

源码下载：http://download.csdn.net/download/csdn_aiyang/9973522

添加权限

<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.BLUETOOTH_PRIVILEGED"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

BluetoothAdapter

获取实例：BluetoothAdapter
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

if (mBluetoothAdapter == null) {
Toast.makeText(this, "设备不支持蓝牙", Toast.LENGTH_SHORT).show();
return;
}

常用方法：

isEnabled() 判断系统蓝牙是否打开
disable() 无弹窗提示关闭系统蓝牙 
enable()  无弹窗提示打开系统蓝牙（此操作有点不友好！） 
startDiscovery() 开始搜索设备 —–适合经典蓝牙和低功耗蓝牙两种
cancelDiscovery() 取消搜索设备
startLeScan() 开始搜索设备 —–适合扫描低功耗蓝牙，但是在api21以上被标记废弃使用
stopLeScan() 停止搜索设备
startScan()  开始搜索设备 —–api21以上扫描低功耗蓝牙，通过bluetoothAdapter.getBluetoothLeScanner()方法获取
stopScan() 停止搜索设备
stopScan() 停止搜索设备

注册广播监听

private IntentFilter makeFilters() {
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
intentFilter.addAction(BluetoothDevice.ACTION_ACL_CONNECTED);
intentFilter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED);
intentFilter.addAction("android.bluetooth.BluetoothAdapter.STATE_OFF");
intentFilter.addAction("android.bluetooth.BluetoothAdapter.STATE_ON");
intentFilter.addAction(BluetoothDevice.ACTION_FOUND);
intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
return intentFilter;
}

BTBroadcastReceiver receiver = new BTBroadcastReceiver();
registerReceiver(receiver, makeFilters());
receiver.setBRInteractionListener(this);

然后在自定义广播类中进行拦截Action操作，再使用自定义接口与Activity进行交互数据信息显示。（可在源码中查看参考）

发送文本

/**
* 蓝牙UUID
*/
public static UUID SPP_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

BluetoothSocket bluetoothSocket =BluetoothDevice.createRfcommSocketToServiceRecord(Comment.SPP_UUID);
OutputStream outputStream =bluetoothSocket.getOutputStream();
outputStream.write(txtString.getBytes("utf-8"));
outputStream.flush();

相关地址下载：

GitHub：https://github.com/aiyangtianci/BluetoothAPP

码云：蓝牙demogiteehttps://gitee.com/AiYangDian/bluetoothdemo