1.网络权限
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-feature android:name="android.hardware.location.gps" />
<uses-feature
android:name="android.hardware.bluetooth_le"
android:required="true" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
打开蓝牙，两种方式，一种是询问式，一种是自动式
2.//注册广播
fun initbc(){
Log.e("TAG","开始注册蓝牙广播" )
//注册搜索结束广播
val finshed = IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED)
registerReceiver(myreviver,finshed)
//注册设备被发现时候的广播
val found = IntentFilter(BluetoothDevice.ACTION_FOUND)
registerReceiver(myreviver,found)
//注册蓝牙状态改变广播
val state = IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED)
registerReceiver(myreviver,state)
}
3.广播类
class Mybro : BroadcastReceiver() {
override fun onReceive(context: Context?, intent: Intent?) {
Log.e("TAG","接收到广播")
Log.e("TAG","广播内容："+intent?.action)
//判断广播Action，是不是蓝牙发送过来的广播
if(intent?.action==ACTION_FOUND){
//获取广播中的信息，蓝牙设备信息
val parcelableExtra : BluetoothDevice? =intent.getParcelableExtra<BluetoothDevice >(EXTRA_DEVICE)
//获取已经配对的设备
parcelableExtra?.let { listDevices?.add(it)}
Log.e("ai","onReceive: " +listDevices)
if(parcelableExtra?.bondState ==BOND_BONDED){
Log.e("TAG","当前已经配对蓝牙设备名称："+ parcelableExtra?.name)
Log.e("TAG","${parcelableExtra.uuids}当前已经配对蓝牙设备地址："+ parcelableExtra?.address)
Log.e("TAG","---------------------------------------------------")
}else if(parcelableExtra?.bondState !=BOND_BONDED){
Log.e("TAG","当前没有配对蓝牙设备名称："+ parcelableExtra?.name)
Log.e("TAG","${parcelableExtra?.uuids}当前没有配对蓝牙设备地址："+ parcelableExtra?.address)
Log.e("TAG","---------------------------------------------------")
}
}else if(intent?.action == BluetoothAdapter.ACTION_DISCOVERY_FINISHED){
Log.e("TAG","蓝牙搜索结束")
Log.e("TAG","搜索结束打印所有蓝牙设备"+listDevices )
}else if(intent?.action == BluetoothAdapter.ACTION_STATE_CHANGED){
Log.e("TAG","蓝牙状态发生改变")
val intExtra =intent.getIntExtra(BluetoothAdapter.EXTRA_STATE,0)
// 蓝牙已经打开
if(intExtra == BluetoothAdapter.STATE_ON){
Log.e("TAG","蓝牙已经被打开，广播监听")
//蓝牙关闭
}else if(intExtra == BluetoothAdapter.STATE_OFF){
Log.e("TAG","蓝牙已经被关闭，广播监听")
}
}
}
}
4.//开始搜索
fun inBule(){
descs=BluetoothAdapter.getDefaultAdapter()
//判断当前蓝牙是否开启
if (descs.isEnabled){
seach()
}else{
descs.enable()
Toast.makeText(this,"蓝牙没有打开",Toast.LENGTH_SHORT).show()
}
}
5./**
* 解决：无法发现蓝牙设备的问题
*
* 对于发现新设备这个功能, 还需另外两个权限(Android M 以上版本需要显式获取授权,附授权代码):
*/
private val ACCESS_LOCATION =1
private fun getPermission() {
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
var permissionCheck =0
permissionCheck = checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION)
permissionCheck += checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION)
if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
//未获得权限
requestPermissions(
arrayOf(
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_COARSE_LOCATION
),
ACCESS_LOCATION
)// 自定义常量,任意整型
}
}
}
6.蓝牙配对
val method: Method = BluetoothDevice::class.java.getMethod("createBond")
Log.e(packageName,"开始配对")
method.invoke(listDevices.get(position))
startActivity(Intent(this@MainActivity,PrintActivity::class.java))
7.解除广播
override fun onDestroy() {
super.onDestroy()
// 解除广播注册
unregisterReceiver(myreviver)
}
