implement messaging system to be displayed below the Tor information

Author: 05nelsonm

sampleapp/src/main/java/io/matthewnelson/sampleapp/ui/fragments/dashboard/DashboardFragment.kt

@@ -15,10 +15,8 @@ import android.widget.Button
 import android.widget.TextView
 import android.widget.Toast
 import androidx.core.app.NotificationCompat
-import androidx.lifecycle.LifecycleOwner
-import androidx.lifecycle.LiveData
-import androidx.lifecycle.MutableLiveData
-import androidx.lifecycle.Observer
+import androidx.core.content.ContextCompat
+import androidx.lifecycle.*
 import io.matthewnelson.encrypted_storage.Prefs
 import io.matthewnelson.sampleapp.App
 import io.matthewnelson.sampleapp.R
@@ -36,11 +34,20 @@ class DashboardFragment : Fragment() {
     companion object {
         private val _liveAppRestartButtonShow = MutableLiveData<Boolean>(false)
         private val liveAppRestartButtonShow: LiveData<Boolean> = _liveAppRestartButtonShow
-
         fun librarySettingsWereChanged() {
             if (liveAppRestartButtonShow.value != true)
                 _liveAppRestartButtonShow.value = true
         }
+
+        private const val EXCEPTION = "EXCEPTION: "
+        private val _liveDashMessage = MutableLiveData<Pair<String, Long>?>(null)
+        private val liveDashMessage: LiveData<Pair<String, Long>?> = _liveDashMessage
+        fun showMessage(msg: String, showLength: Long, isException: Boolean = false) {
+            _liveDashMessage.value = if (isException)
+                Pair("$EXCEPTION\n$msg", showLength)
+            else
+                Pair(msg, showLength)
+        }
     }
 
     // Top row
@@ -53,6 +60,9 @@ class DashboardFragment : Fragment() {
     private lateinit var textViewSocksPort: TextView
     private lateinit var textViewHttpPort: TextView
 
+    // Messages
+    private lateinit var textViewMessage: TextView
+
     // Button
     private lateinit var buttonAppRestart: Button
 
@@ -82,6 +92,7 @@ class DashboardFragment : Fragment() {
         textViewControlPort = view.findViewById(R.id.dash_text_view_port_control)
         textViewSocksPort = view.findViewById(R.id.dash_text_view_port_socks)
         textViewHttpPort = view.findViewById(R.id.dash_text_view_port_http)
+        textViewMessage = view.findViewById(R.id.dash_text_view_message)
         buttonAppRestart = view.findViewById(R.id.dash_button_app_restart)
     }
 
@@ -91,6 +102,19 @@ class DashboardFragment : Fragment() {
                 buttonAppRestart.visibility = View.VISIBLE
             }
         })
+        liveDashMessage.observe(owner, Observer {
+            if (it != null) {
+                textViewMessage.text = it.first
+                textViewMessage.background = if (it.first.contains(EXCEPTION))
+                    ContextCompat.getDrawable(textViewMessage.context, R.drawable.rounded_rectangle_color_red)
+                else
+                    ContextCompat.getDrawable(textViewMessage.context, R.drawable.rounded_rectangle_color_primary_light)
+                textViewMessage.visibility = View.VISIBLE
+                launchCleanUpMessageJob(it.second)
+            } else {
+                textViewMessage.visibility = View.GONE
+            }
+        })
         TorServiceController.appEventBroadcaster?.let {
             (it as MyEventBroadcaster).liveBandwidth.observe(owner, Observer { string ->
                 if (string.isNullOrEmpty()) return@Observer
@@ -121,6 +145,17 @@ class DashboardFragment : Fragment() {
         }
     }
 
+    private var showMessageCleanUpJob: Job? = null
+
+    private fun launchCleanUpMessageJob(delayLength: Long) {
+        showMessageCleanUpJob?.cancel()
+
+        showMessageCleanUpJob = lifecycleScope.launch {
+            delay(delayLength)
+            _liveDashMessage.value = null
+        }
+    }
+
     private var killAppJob: Job? = null
 
     private fun initButtons(context: Context, owner: LifecycleOwner) {