Added network checks and display error dialog

Signed-off-by: Bhavesh Kumawat <kumawatbhavesh1000@gmail.com>
Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

app/src/main/java/com/nextcloud/talk/conversationlist/ConversationsListActivity.kt

@@ -21,6 +21,8 @@ import android.content.Intent
 import android.content.pm.PackageManager
 import android.graphics.drawable.ColorDrawable
 import android.graphics.drawable.Drawable
+import android.net.ConnectivityManager
+import android.net.NetworkCapabilities
 import android.net.Uri
 import android.os.Build
 import android.os.Bundle
@@ -679,6 +681,9 @@ class ConversationsListActivity :
     fun fetchRooms() {
         val includeStatus = isUserStatusAvailable(userManager.currentUser.blockingGet())
 
+        // checks internet connection before fetching rooms
+        if (isNetworkAvailable(context)) {
+            Log.d(TAG, "Internet connection available")
             dispose(null)
             isRefreshing = true
             conversationItems = ArrayList()
@@ -735,6 +740,10 @@ class ConversationsListActivity :
                     binding?.swipeRefreshLayoutView?.isRefreshing = false
                     isRefreshing = false
                 }
+        } else {
+            Log.d(TAG, "No internet connection detected")
+            showNetworkErrorDialog()
+        }
     }
 
     private fun fetchPendingInvitations() {
@@ -840,6 +849,42 @@ class ConversationsListActivity :
         }
     }
 
+    private fun showNetworkErrorDialog() {
+        binding.floatingActionButton.let {
+            val dialogBuilder = MaterialAlertDialogBuilder(it.context)
+                .setIcon(
+                    viewThemeUtils.dialog.colorMaterialAlertDialogIcon(
+                        context,
+                        R.drawable.ic_baseline_error_outline_24dp
+                    )
+                )
+                .setTitle(R.string.nc_check_your_internet)
+                .setCancelable(false)
+                .setNegativeButton(R.string.close, null)
+                .setNeutralButton(R.string.nc_refresh) { _, _ ->
+                    fetchRooms()
+                    fetchPendingInvitations()
+                }
+
+            viewThemeUtils.dialog.colorMaterialAlertDialogBackground(it.context, dialogBuilder)
+            val dialog = dialogBuilder.show()
+            viewThemeUtils.platform.colorTextButtons(
+                dialog.getButton(AlertDialog.BUTTON_POSITIVE),
+                dialog.getButton(AlertDialog.BUTTON_NEGATIVE),
+                dialog.getButton(AlertDialog.BUTTON_NEUTRAL)
+            )
+        }
+    }
+
+    @Suppress("ReturnCount")
+    private fun isNetworkAvailable(context: Context): Boolean {
+        val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
+        val network = connectivityManager.activeNetwork ?: return false
+        val capabilities = connectivityManager.getNetworkCapabilities(network) ?: return false
+        return capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) ||
+            capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)
+    }
+
     private fun sortConversations(conversationItems: MutableList<AbstractFlexibleItem<*>>) {
         conversationItems.sortWith { o1: AbstractFlexibleItem<*>, o2: AbstractFlexibleItem<*> ->
             val conversation1 = (o1 as ConversationItem).model

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

@@ -380,6 +380,8 @@ How to translate with transifex:
     <string name="openConversations">Open conversations</string>
     <string name="error_loading_chats">There was a problem loading your chats</string>
     <string name="close">Close</string>
+    <string name="nc_refresh">Refresh</string>
+    <string name="nc_check_your_internet">Please check your internet connection</string>
 
     <!-- Chat -->
     <string name="nc_hint_enter_a_message">Enter a message …</string>