very basic screen for the wifi-p2p

app/src/main/java/com/faraphel/tasks_valider/MainActivity.kt

@@ -13,7 +13,7 @@ import androidx.activity.compose.setContent
 import androidx.annotation.RequiresApi
 import com.faraphel.tasks_valider.connectivity.wifi_p2p.WifiP2pHelper
 import com.faraphel.tasks_valider.database.Database
-import com.faraphel.tasks_valider.ui.widgets.WifiP2pWidgetDevice
+import com.faraphel.tasks_valider.ui.screen.RoomScreen
 
 
 class MainActivity : ComponentActivity() {
@@ -54,29 +54,11 @@ class MainActivity : ComponentActivity() {
         // create a helper for handling the WiFi-Direct
         this.p2pHelper = WifiP2pHelper(p2pManager, p2pChannel)
 
-        // try to display the different devices when available.
+        // open the room selection screen
-        this.p2pHelper!!.registerListener(
+        this.setContent {
-            WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION,
+            RoomScreen(this.p2pHelper!!)
-            {
-                peers: WifiP2pDeviceList? ->
-
-                Log.d("wifi-p2p", "peers: $peers")
-                if (peers != null) this.setContent {
-                    for (device in peers.deviceList) {
-                        Log.d("wifi-p2p", "device: ${device.deviceAddress}")
-                        WifiP2pWidgetDevice(device)
         }
     }
-            },
-            once = true
-        )
-
-        // discovers the peers to trigger the peer changed event
-        this.p2pHelper!!.discoverPeers(object : WifiP2pManager.ActionListener {
-            override fun onSuccess() { Log.i("wifi-p2p", "discovering successful !") }
-            override fun onFailure(reason: Int) { Log.e("wifi-p2p", "discovering failed. Reason: $reason") }
-        })
-    }
 
     @RequiresApi(Build.VERSION_CODES.O)
     @SuppressLint("UnspecifiedRegisterReceiverFlag")

app/src/main/java/com/faraphel/tasks_valider/ui/screen/RoomClientScreen.kt

@@ -0,0 +1,31 @@
+package com.faraphel.tasks_valider.ui.screen
+
+import android.net.wifi.p2p.WifiP2pDeviceList
+import android.net.wifi.p2p.WifiP2pManager
+import androidx.compose.foundation.layout.Column
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import com.faraphel.tasks_valider.connectivity.wifi_p2p.WifiP2pHelper
+import com.faraphel.tasks_valider.ui.widgets.connectivity.WifiP2pDeviceListWidget
+
+
+@Composable
+fun RoomClientScreen(wifiP2pHelper: WifiP2pHelper) {
+    val peers = remember { mutableStateOf<WifiP2pDeviceList?>(null) }
+
+    Column {
+        Text(text = "Find a Server")
+        WifiP2pDeviceListWidget(peers.value)
+    }
+
+    // TODO(Faraphel): might be doubtful. Test with more phones, should it only run once ? refresh button ?
+    wifiP2pHelper.registerListener(
+        WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION,
+        { new_peers: WifiP2pDeviceList? -> peers.value = new_peers },
+        once = true
+    )
+    wifiP2pHelper.discoverPeers()
+}

app/src/main/java/com/faraphel/tasks_valider/ui/screen/RoomScreen.kt

@@ -0,0 +1,44 @@
+package com.faraphel.tasks_valider.ui.screen
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.material3.Button
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import com.faraphel.tasks_valider.connectivity.wifi_p2p.WifiP2pHelper
+
+
+enum class RoomScreenType {
+    UNDEFINED,
+    HOST,
+    CLIENT
+}
+
+
+/**
+ * This screen will allow the user to choose which room is he connecting to, or let him create one.
+ */
+@Composable
+fun RoomScreen(wifiP2pHelper: WifiP2pHelper) {
+    val roomMode = remember { mutableStateOf(RoomScreenType.UNDEFINED) }
+
+    when (roomMode.value) {
+        RoomScreenType.UNDEFINED -> Column {
+            Button(onClick = { roomMode.value = RoomScreenType.CLIENT }) {
+                Text(text = "Join a room")
+            }
+            Button(onClick = { roomMode.value = RoomScreenType.HOST }) {
+                Text(text = "Create a room")
+            }
+        }
+        RoomScreenType.CLIENT -> {
+            // Client mode
+            RoomClientScreen(wifiP2pHelper)
+        }
+        RoomScreenType.HOST -> {
+            // Host mode
+            TODO("Faraphel: host mode not implemented")
+        }
+    }
+}

app/src/main/java/com/faraphel/tasks_valider/ui/widgets/connectivity/WifiP2pDeviceListWidget.kt

@@ -0,0 +1,23 @@
+package com.faraphel.tasks_valider.ui.widgets.connectivity
+
+import android.net.wifi.p2p.WifiP2pDeviceList
+import androidx.compose.foundation.layout.Column
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+
+
+/**
+ * Represent a list of WiFi-Direct devices.
+ */
+@Composable
+fun WifiP2pDeviceListWidget(peers: WifiP2pDeviceList?) {
+    Text(text = "Devices (${peers?.deviceList?.size ?: 0})")
+
+    Column {
+        if (peers != null) {
+            for (device in peers.deviceList) {
+                WifiP2pDeviceWidget(device)
+            }
+        }
+    }
+}

app/src/main/java/com/faraphel/tasks_valider/ui/widgets/connectivity/WifiP2pDeviceWidget.kt

@@ -1,4 +1,4 @@
-package com.faraphel.tasks_valider.ui.widgets
+package com.faraphel.tasks_valider.ui.widgets.connectivity
 
 import android.net.wifi.p2p.WifiP2pDevice
 import androidx.compose.foundation.layout.Column
@@ -8,7 +8,7 @@ import androidx.compose.runtime.Composable
 
 
 @Composable
-fun WifiP2pWidgetDevice(device: WifiP2pDevice) {
+fun WifiP2pDeviceWidget(device: WifiP2pDevice) {
     Column {
         Row {
             Text(text = "Name: ")