WIP

app/build.gradle

@@ -18,7 +18,7 @@ android {
 
     defaultConfig {
         applicationId "com.isolaatti"
-        minSdk 23
+        minSdk 24
         targetSdk 33
         versionCode 1
         versionName "1.0"

app/src/main/AndroidManifest.xml

@@ -2,6 +2,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <application
         android:name=".MyApplication"
         android:allowBackup="true"

app/src/main/java/com/isolaatti/MyApplication.kt

@@ -1,29 +1,26 @@
 package com.isolaatti
 
-import android.app.Activity
 import android.app.Application
-import android.os.Bundle
+import android.net.ConnectivityManager
-import com.isolaatti.auth.data.AuthRepositoryImpl
+import com.isolaatti.connectivity.ConnectivityCallbackImpl
-import com.isolaatti.auth.data.local.TokenStorage
-import com.isolaatti.auth.data.remote.AuthApi
-import com.isolaatti.auth.domain.AuthRepository
-import com.isolaatti.connectivity.RetrofitClient
-import dagger.Provides
 import dagger.hilt.android.HiltAndroidApp
-import javax.inject.Singleton
 
 @HiltAndroidApp
 class MyApplication : Application() {
 
     private val activityLifecycleCallbacks = ActivityLifecycleCallbacks()
+    lateinit var connectivityCallbackImpl: ConnectivityCallbackImpl
 
     override fun onCreate() {
         super.onCreate()
         registerActivityLifecycleCallbacks(activityLifecycleCallbacks)
+        connectivityCallbackImpl = ConnectivityCallbackImpl()
+        getSystemService(ConnectivityManager::class.java).registerDefaultNetworkCallback(connectivityCallbackImpl)
     }
 
     override fun onTerminate() {
         super.onTerminate()
         unregisterActivityLifecycleCallbacks(activityLifecycleCallbacks)
+        getSystemService(ConnectivityManager::class.java).unregisterNetworkCallback(connectivityCallbackImpl)
     }
 }

app/src/main/java/com/isolaatti/common/IsolaattiBaseActivity.kt

@@ -5,13 +5,17 @@ import android.content.DialogInterface
 import android.content.Intent
 import android.os.Bundle
 import android.util.Log
+import android.view.View
 import android.widget.Toast
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.activity.viewModels
 import androidx.appcompat.app.AppCompatActivity
 import androidx.lifecycle.Observer
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
+import com.google.android.material.snackbar.Snackbar
 import com.isolaatti.R
+import com.isolaatti.connectivity.ConnectivityCallbackImpl
+import com.isolaatti.connectivity.NetworkStatus
 import com.isolaatti.home.HomeActivity
 import com.isolaatti.login.LogInActivity
 import com.isolaatti.utils.Resource
@@ -22,6 +26,9 @@ abstract class IsolaattiBaseActivity : AppCompatActivity()  {
 
     val errorViewModel: ErrorMessageViewModel by viewModels()
 
+    private var snackbarNetworkStatus: Snackbar? = null
+    private var connectionHasBeenLost: Boolean = false
+
     private val errorObserver: Observer<Resource.Error.ErrorType> = Observer {
         when(it) {
             Resource.Error.ErrorType.AuthError -> showReAuthDialog()
@@ -33,6 +40,21 @@ abstract class IsolaattiBaseActivity : AppCompatActivity()  {
         }
     }
 
+    private val connectivityObserver: Observer<Boolean> = Observer { networkAvailable ->
+        val view: View = window.decorView.findViewById(android.R.id.content) ?: return@Observer
+
+        if(!networkAvailable) {
+            connectionHasBeenLost = true
+            snackbarNetworkStatus = Snackbar.make(view, R.string.network_conn_lost, Snackbar.LENGTH_INDEFINITE)
+            snackbarNetworkStatus?.show()
+        } else if(connectionHasBeenLost) {
+            snackbarNetworkStatus?.dismiss()
+            snackbarNetworkStatus = Snackbar.make(view, R.string.network_conn_restored, Snackbar.LENGTH_SHORT)
+            snackbarNetworkStatus?.show()
+            connectionHasBeenLost = false
+        }
+    }
+
     private val signInActivityResult = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { activityResult ->
         if(activityResult.resultCode == Activity.RESULT_OK) {
             onRetry()
@@ -77,6 +99,9 @@ abstract class IsolaattiBaseActivity : AppCompatActivity()  {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         errorViewModel.error.observe(this, errorObserver)
+        NetworkStatus.networkIsAvailable.observe(this, connectivityObserver)
+
+
         Log.d("IsolaattiBaseActivity", errorViewModel.toString())
     }
 }

app/src/main/java/com/isolaatti/connectivity/ConnectivityCallbackImpl.kt

@@ -0,0 +1,21 @@
+package com.isolaatti.connectivity
+
+import android.net.ConnectivityManager
+import android.net.Network
+
+class ConnectivityCallbackImpl : ConnectivityManager.NetworkCallback() {
+    override fun onAvailable(network: Network) {
+        super.onAvailable(network)
+        NetworkStatus.networkIsAvailable.postValue(true)
+    }
+
+    override fun onLost(network: Network) {
+        super.onLost(network)
+        NetworkStatus.networkIsAvailable.postValue(false)
+    }
+
+    override fun onUnavailable() {
+        super.onUnavailable()
+        NetworkStatus.networkIsAvailable.postValue(false)
+    }
+}

app/src/main/java/com/isolaatti/connectivity/NetworkStatus.kt

@@ -1,5 +1,7 @@
 package com.isolaatti.connectivity
 
+import androidx.lifecycle.MutableLiveData
+
 object NetworkStatus {
-    var networkIsAvailable: Boolean = true
+    val networkIsAvailable: MutableLiveData<Boolean> = MutableLiveData()
 }

app/src/main/java/com/isolaatti/profile/ui/ProfileMainFragment.kt

@@ -15,6 +15,7 @@ import androidx.recyclerview.widget.LinearLayoutManager
 import com.isolaatti.BuildConfig
 import com.isolaatti.R
 import com.isolaatti.common.Dialogs
+import com.isolaatti.common.ErrorMessageViewModel
 import com.isolaatti.databinding.FragmentDiscussionsBinding
 import com.isolaatti.followers.domain.FollowingState
 import com.isolaatti.home.FeedFragment
@@ -48,6 +49,7 @@ class ProfileMainFragment : Fragment() {
     lateinit var viewBinding: FragmentDiscussionsBinding
     private val viewModel: ProfileViewModel by viewModels()
     val optionsViewModel: BottomSheetPostOptionsViewModel by activityViewModels()
+    val errorViewModel: ErrorMessageViewModel by activityViewModels()
     private var userId: Int? = null
 
     lateinit var postsAdapter: PostsRecyclerViewAdapter
@@ -213,6 +215,9 @@ class ProfileMainFragment : Fragment() {
                 viewBinding.swipeToRefresh.isRefreshing = false
             }
         }
+        viewModel.errorLoading.observe(viewLifecycleOwner) {
+            errorViewModel.error.postValue(it)
+        }
     }
 
     private fun getData() {

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

@@ -75,4 +75,6 @@
     <string name="comment_posted">Comment posted!</string>
     <string name="comment_failed_to_post">Comment failed to post</string>
     <string name="edit_comment">Edit comment</string>
+    <string name="network_conn_lost">Network connection lost</string>
+    <string name="network_conn_restored">Network connection restored</string>
 </resources>