Android 6.0 Kotlin 蓝牙BLE扫描（改为指定时间没有发现新设备后停止扫描使用interface）

package com.arci.myapplication

import android.os.Bundle
import android.support.design.widget.Snackbar
import android.support.v7.app.AppCompatActivity
import android.view.Menu
import android.view.MenuItem
import android.view.View

import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.content_main.*
import android.bluetooth.BluetoothManager
import android.content.Context
import android.bluetooth.BluetoothAdapter
import android.widget.Toast
import android.content.Intent
import android.bluetooth.BluetoothDevice
import android.bluetooth.le.BluetoothLeScanner
import android.bluetooth.le.ScanCallback
import android.bluetooth.le.ScanResult
import android.os.Handler
import android.os.Looper
import android.os.Message

class MainActivity : AppCompatActivity() {
private val BLE_SCAN_PERIOD : Long = 10000
private val REQUEST_BLUETOOTH_TURN_ON = 1
private lateinit var bleAdapter: BluetoothAdapter
private lateinit var bleManager: BluetoothManager
private lateinit var bleScanner: BluetoothLeScanner
private lateinit var bleScanCallback: BleScanCallback
private lateinit var bleScanHandler: Handler
private var bleScanResults = mutableMapOf<String?, BluetoothDevice?>()

override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
setSupportActionBar(toolbar)

fab.setOnClickListener { view ->
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show()
}
bleScanHandler = Handler()
//蓝牙管理，这是系统服务可以通过getSystemService(BLUETOOTH_SERVICE)的方法获取实例
bleManager = getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
//通过蓝牙管理实例获取适配器，然后通过扫描方法（scan）获取设备(device)
bleAdapter = bleManager.adapter
if (!bleAdapter.isEnabled) {
val bluetoothTurnOn = Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE)
startActivityForResult(bluetoothTurnOn, REQUEST_BLUETOOTH_TURN_ON)
} else {
bleStartScan.run()
}
}

//start scan
private val bleStartScan = Runnable {
bleScanner = bleAdapter.bluetoothLeScanner
//
bleScanCallback = BleScanCallback(bleScanResults)
bleScanCallback.setNewScanResultListener(object : bleNewScanResultListener {
override fun onNewScanResult(scanResult: ScanResult?) {
TextView1.text = scanResult?.device?.name + ": " + scanResult?.device?.address
Handler(Looper.getMainLooper()).post {
Toast.makeText(this@MainActivity, scanResult?.device?.name + ": " + scanResult?.device?.address, Toast.LENGTH_SHORT).show()
}
bleScanHandler.removeCallbacks(bleStopScan)
bleScanHandler.postDelayed(bleStopScan, BLE_SCAN_PERIOD)
}
});
//
Toast.makeText(this.applicationContext, "蓝牙BLE扫描开始", Toast.LENGTH_SHORT).show()
bleScanner.startScan(bleScanCallback)
bleScanHandler.postDelayed(bleStopScan, BLE_SCAN_PERIOD)
}

private val bleStopScan = Runnable {
bleScanner.stopScan(bleScanCallback)
Toast.makeText(this.applicationContext, "蓝牙BLE扫描结束", Toast.LENGTH_SHORT).show()
}

//定义接口
interface bleNewScanResultListener {
fun onNewScanResult(scanResult: ScanResult?)
}

class BleScanCallback(resultMap: MutableMap<String?, BluetoothDevice?>) : ScanCallback() {
private var resultOfScan = resultMap
var listener: bleNewScanResultListener? = null

fun setNewScanResultListener(listener: bleNewScanResultListener) {
this.listener = listener
}

override fun onScanResult(callbackType: Int, result: ScanResult?) {
addScanResult(result)
}

override fun onBatchScanResults(results: MutableList<ScanResult>?) {
results?.forEach { result -> addScanResult(result) }
}

override fun onScanFailed(errorCode: Int) {

}

private fun addScanResult(scanResult: ScanResult?) {
val bleDevice = scanResult?.device
val deviceAddress = bleDevice?.address
if (!resultOfScan.contains(deviceAddress)) {
resultOfScan.put(deviceAddress, bleDevice)
this.listener?.onNewScanResult(scanResult)
}
}
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
when (requestCode) {
REQUEST_BLUETOOTH_TURN_ON->{
when (resultCode) {
RESULT_OK->{
Toast.makeText(this.applicationContext, "蓝牙开启成功", Toast.LENGTH_SHORT).show()
bleStartScan.run()
}
RESULT_CANCELED->{
Toast.makeText(this.applicationContext, "蓝牙开启失败", Toast.LENGTH_SHORT).show()
}
}
}
}
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
// Inflate the menu; this adds items to the action bar if it is present.
menuInflater.inflate(R.menu.menu_main, menu)
return true
}

override fun onOptionsItemSelected(item: MenuItem): Boolean {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
return when (item.itemId) {
R.id.action_settings -> true
else -> super.onOptionsItemSelected(item)
}
}
}