[android] Add Soft-AP scanning using Android Wi-Fi Manager APIs. (#19787

)

* After Wi-Fi AP list has been populated in the spinner
  * The user can select one from the spinner and connect to it.
  * Support OPEN authentication, no key management, and no encryption.

* After connected to the selected Wi-Fi AP
  * The user can then 'DISCOVER' the services around.

* After an IP address and its discriminator has been received
  * The user can 'COMMISSION' the device.

src/android/CHIPTool/app/src/main/AndroidManifest.xml

@@ -9,6 +9,8 @@
  <uses-permission android:name="android.permission.INTERNET" />
  <uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />
  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+ <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
+ <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
  <uses-permission android:name="android.permission.NFC" />
 
  <application

src/android/CHIPTool/app/src/main/java/com/google/chip/chiptool/provisioning/AddressCommissioningFragment.kt

@@ -1,5 +1,12 @@
 package com.google.chip.chiptool.provisioning
 
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import android.net.wifi.WifiManager
+import android.net.wifi.ScanResult
+import android.net.wifi.WifiConfiguration
 import android.os.Bundle
 import android.util.Log
 import android.view.LayoutInflater
@@ -19,6 +26,9 @@ import kotlinx.android.synthetic.main.address_commissioning_fragment.discoverBtn
 import kotlinx.android.synthetic.main.address_commissioning_fragment.discoverListSpinner
 import kotlinx.android.synthetic.main.address_commissioning_fragment.discriminatorEditText
 import kotlinx.android.synthetic.main.address_commissioning_fragment.pincodeEditText
+import kotlinx.android.synthetic.main.address_commissioning_fragment.wifiConnectBtn
+import kotlinx.android.synthetic.main.address_commissioning_fragment.wifiScanBtn
+import kotlinx.android.synthetic.main.address_commissioning_fragment.wifiScanListSpinner
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
@@ -27,6 +37,8 @@ import kotlinx.coroutines.launch
 
 class AddressCommissioningFragment : Fragment() {
  private val ipAddressList = ArrayList<String>()
+ private val wifiApList = ArrayList<String>()
+ private var wifiApSsid = String()
  private val scope = CoroutineScope(Dispatchers.Main + Job())
 
  override fun onCreateView(
@@ -69,6 +81,84 @@ class AddressCommissioningFragment : Fragment() {
  discoverBtn.isEnabled = true
  }
  }
+
+ wifiConnectBtn.setOnClickListener { _ ->
+ wifiConnectBtn.isEnabled = false
+ val context = getActivity()
+ val wifiManager = context?.getSystemService(Context.WIFI_SERVICE) as WifiManager
+
+ // TODO : filter SSID with Information Element, OPEN authentication
+ var config : WifiConfiguration = WifiConfiguration();
+ config.SSID = "\"${wifiApSsid}\""
+ config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE)
+
+ Log.d(TAG, "Disconnect existing connection")
+ wifiManager.disconnect()
+ Log.d(TAG, "Add network ${config.SSID}")
+ var res = wifiManager.addNetwork(config)
+ if (res == -1) {
+ Log.d(TAG,"Add network failed")
+ } else {
+ var success = wifiManager.enableNetwork(res, true)
+ if (success) {
+ Log.d(TAG, "Enable network ${config.SSID} succeeded")
+ } else {
+ Log.d(TAG, "Enable network ${config.SSID} failed")
+ wifiConnectBtn.isEnabled = true
+ }
+ }
+ }
+
+ wifiScanBtn.setOnClickListener { _ ->
+ wifiScanBtn.isEnabled = false
+ val context = getActivity()
+ val wifiManager = context?.getSystemService(Context.WIFI_SERVICE) as WifiManager
+ val wifiScanReceiver = object : BroadcastReceiver() {
+ override fun onReceive(context: Context, intent: Intent) {
+ Log.d(TAG, "Scan result event received")
+ val success = intent.getBooleanExtra(WifiManager.EXTRA_RESULTS_UPDATED, false)
+ if (success) {
+ Log.d(TAG, "Scan succeeded")
+ val results = wifiManager.scanResults
+ updateWifiScanListSpinner(results)
+ } else {
+ Log.d(TAG, "Scan failed")
+ }
+ wifiScanBtn.isEnabled = true
+ }
+ }
+
+ val intentFilter = IntentFilter()
+ intentFilter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)
+
+ context.registerReceiver(wifiScanReceiver, intentFilter)
+ val success = wifiManager.startScan()
+ if (!success) {
+ Log.d(TAG, "Scan not started")
+ // TODO: scan failure handling
+ } else {
+ Log.d(TAG, "Scan started")
+ }
+ }
+ }
+
+ private fun updateWifiScanListSpinner(scanResults : MutableList<ScanResult>) {
+ wifiApList.clear()
+ for (result in scanResults) {
+ if (result.SSID.toString().isNotEmpty())
+ wifiApList.add("${result.SSID}, ${result.BSSID}, ${result.level}")
+ }
+ requireActivity().runOnUiThread {
+ wifiScanListSpinner.adapter =
+ ArrayAdapter(requireContext(), android.R.layout.simple_spinner_dropdown_item, wifiApList)
+ wifiScanListSpinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
+ override fun onItemSelected(parent: AdapterView<*>, view: View, position: Int, id: Long) {
+ wifiApSsid = wifiApList[position].split(",")[0].trim()
+ Log.d(TAG, "ready to connect to $wifiApSsid")
+ }
+ override fun onNothingSelected(parent: AdapterView<*>) {}
+ }
+ }
  }
 
  private fun updateSpinner() {
@@ -98,4 +188,4 @@ class AddressCommissioningFragment : Fragment() {
 
  fun newInstance(): AddressCommissioningFragment = AddressCommissioningFragment()
  }
-}
+}

src/android/CHIPTool/app/src/main/res/layout/address_commissioning_fragment.xml

@@ -84,6 +84,24 @@
  app:layout_constraintStart_toStartOf="parent"
  app:layout_constraintTop_toBottomOf="@id/address_commissioning_fragment_flow">
 
+ <Button
+ android:id="@+id/wifiScanBtn"
+ android:layout_width="wrap_content"
+ android:layout_height="wrap_content"
+ android:text="@string/wifi_scan_btn_text"/>
+
+ <Spinner
+ android:id="@+id/wifiScanListSpinner"
+ android:padding="8dp"
+ android:layout_width="match_parent"
+ android:layout_height="wrap_content" />
+
+ <Button
+ android:id="@+id/wifiConnectBtn"
+ android:layout_width="wrap_content"
+ android:layout_height="wrap_content"
+ android:text="@string/wifi_connect_btn_text"/>
+
  <Button
  android:id="@+id/discoverBtn"
  android:layout_width="wrap_content"
@@ -108,4 +126,4 @@
  app:layout_constraintHorizontal_bias="1.0"
  app:layout_constraintStart_toStartOf="parent" />
 
-</androidx.constraintlayout.widget.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>

src/android/CHIPTool/app/src/main/res/values/strings.xml

@@ -39,6 +39,7 @@
  <string name="enter_pincode_label_text">Pincode</string>
  <string name="commission_btn_text">Commission</string>
  <string name="dns_discover_btn_text">Discover</string>
+ <string name="wifi_scan_btn_text">Wi-Fi Scan</string>
 
  <string name="send_command_on_btn_text">On</string>
  <string name="send_command_off_btn_text">Off</string>
@@ -163,4 +164,5 @@
  <string name="select_a_command">Select a command</string>
  <string name="select_a_cluster">Select a cluster</string>
  <string name="endpoint_name">Endpoint: </string>
+ <string name="wifi_connect_btn_text">Connect</string>
 </resources>