Enable tracking service on main activity

app/src/main/java/io/bartek/MainActivity.kt

@@ -1,50 +1,41 @@
 package io.bartek
 
-import android.content.BroadcastReceiver
-import android.content.Context
-import android.content.Intent
-import android.content.IntentFilter
+import android.content.*
 import android.os.Build
-import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
-import android.provider.Settings
-import android.provider.Settings.*
 import android.view.View
-import android.widget.Toast
+import android.widget.Button
+import androidx.appcompat.app.AppCompatActivity
 import androidx.localbroadcastmanager.content.LocalBroadcastManager
 import io.bartek.service.ForegroundService
+import io.bartek.service.ServiceState
+
 
 class MainActivity : AppCompatActivity() {
+    private lateinit var controlServerButton: Button
+
     private val receiver = object : BroadcastReceiver() {
         override fun onReceive(context: Context?, intent: Intent?) {
             intent?.let {
-                when(intent.getStringExtra("STATE")) {
-                    "STARTED" -> notifyOnStart()
-                    "STOPPED" -> notifyOnStop()
-                }
+                updateViewAccordingToServiceState(
+                    ServiceState.valueOf(it.getStringExtra("STATE") ?: "STOPPED")
+                )
             }
         }
     }
 
-    private fun notifyOnStart() {
-        Toast.makeText(
-            this,
-            resources.getString(R.string.server_toast_service_started),
-            Toast.LENGTH_SHORT
-        ).show()
+    private fun updateViewAccordingToServiceState(newState: ServiceState) {
+        controlServerButton.isEnabled = true
+        when (newState) {
+            ServiceState.STOPPED -> controlServerButton.text = getString(R.string.main_activity_run)
+            ServiceState.RUNNING -> controlServerButton.text = getString(R.string.main_activity_stop)
         }
-
-    private fun notifyOnStop() {
-        Toast.makeText(
-            this,
-            resources.getString(R.string.server_toast_service_stopped),
-            Toast.LENGTH_SHORT
-        ).show()
     }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+        controlServerButton = findViewById(R.id.control_server_button)
     }
 
     override fun onResume() {
@@ -52,6 +43,7 @@ class MainActivity : AppCompatActivity() {
         LocalBroadcastManager
             .getInstance(this)
             .registerReceiver(receiver, IntentFilter("io.bartek.web.server.CHANGE_STATE"))
+        updateViewAccordingToServiceState(ForegroundService.state)
     }
 
     override fun onPause() {
@@ -61,12 +53,16 @@ class MainActivity : AppCompatActivity() {
         super.onPause()
     }
 
-    fun startServer(view: View) = actionOnService(ForegroundService.START)
-
-    fun stopServer(view: View) = actionOnService(ForegroundService.STOP)
-
     fun openTTSSettings(view: View) = startActivity(Intent("com.android.settings.TTS_SETTINGS"))
 
+    fun controlServer(view: View) {
+        controlServerButton.isEnabled = false
+        when (ForegroundService.state) {
+            ServiceState.STOPPED -> actionOnService(ForegroundService.START)
+            ServiceState.RUNNING -> actionOnService(ForegroundService.STOP)
+        }
+    }
+
     private fun actionOnService(action: String) {
         Intent(this, ForegroundService::class.java).also {
             it.action = action
@@ -78,6 +74,4 @@ class MainActivity : AppCompatActivity() {
             startService(it)
         }
     }
-
-
 }

app/src/main/java/io/bartek/service/ForegroundService.kt

@@ -4,12 +4,15 @@ import android.app.*
 import android.content.Context
 import android.content.Intent
 import android.graphics.Color
+import android.os.Binder
 import android.os.Build
+import android.os.IBinder
 import android.os.PowerManager
 import io.bartek.MainActivity
 import io.bartek.R
 import io.bartek.web.TTSServer
 
+
 class ForegroundService : Service() {
     private var port: Int = 8080
     private var wakeLock: PowerManager.WakeLock? = null
@@ -90,6 +93,7 @@ class ForegroundService : Service() {
                 }
             }
         ttsServer = TTSServer(port, this)
+        state = ServiceState.RUNNING
     }
 
     private fun stopService() {
@@ -103,9 +107,14 @@ class ForegroundService : Service() {
             stopForeground(true)
             stopSelf()
         }
+        state = ServiceState.STOPPED
     }
 
     companion object {
+        // Disclaimer: I don't know the better way
+        // to check whether the service is already running
+        // than to place it as a static field
+        var state = ServiceState.STOPPED
         private const val NOTIFICATION_CHANNEL_ID = "TTSService.NOTIFICATION_CHANNEL"
         const val PORT = "TTSService.PORT"
         const val START = "START"

app/src/main/java/io/bartek/service/ServiceState.kt

@@ -0,0 +1,6 @@
+package io.bartek.service
+
+enum class ServiceState {
+    RUNNING,
+    STOPPED
+}

app/src/main/java/io/bartek/web/WebServer.kt

@@ -8,6 +8,7 @@ import androidx.localbroadcastmanager.content.LocalBroadcastManager
 import fi.iki.elonen.NanoHTTPD
 import fi.iki.elonen.NanoHTTPD.Response.Status.*
 import io.bartek.R
+import io.bartek.service.ServiceState
 import io.bartek.tts.TTS
 import org.json.JSONObject
 import java.util.*
@@ -72,7 +73,7 @@ class TTSServer(port: Int, private val context: Context) : NanoHTTPD(port),
         LocalBroadcastManager
             .getInstance(context)
             .sendBroadcast(Intent("io.bartek.web.server.CHANGE_STATE").also {
-                it.putExtra("STATE", "STARTED")
+                it.putExtra("STATE", ServiceState.RUNNING.name)
             })
     }
 
@@ -81,7 +82,7 @@ class TTSServer(port: Int, private val context: Context) : NanoHTTPD(port),
         LocalBroadcastManager
             .getInstance(context)
             .sendBroadcast(Intent("io.bartek.web.server.CHANGE_STATE").also {
-                it.putExtra("STATE", "STOPPED")
+                it.putExtra("STATE", ServiceState.STOPPED.name)
             })
     }
 }

app/src/main/res/layout/activity_main.xml

@@ -12,32 +12,13 @@
         android:layout_height="wrap_content"
         android:orientation="horizontal">
 
-        <EditText
-            android:id="@+id/port"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:ems="10"
-            android:hint="@string/main_activity_server_port"
-            android:inputType="number"
-            android:text="8080" />
-
         <Button
-            android:id="@+id/run"
+            android:id="@+id/control_server_button"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_weight="2"
-            android:onClick="startServer"
+            android:onClick="controlServer"
             android:text="@string/main_activity_run" />
-
-        <Button
-            android:id="@+id/stop"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_weight="2"
-            android:onClick="stopServer"
-            android:text="@string/main_activity_stop" />
-
     </LinearLayout>
 
     <Button

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

@@ -5,9 +5,6 @@
     <string name="service_notification_title">Server is running</string>
     <string name="service_notification_text">The HTTP server is listening on port %1$d</string>
 
-    <string name="server_toast_service_started">TTS-HTTP Server started</string>
-    <string name="server_toast_service_stopped">TTS-HTTP Server stopped</string>
-
     <string name="main_activity_server_port">Server port</string>
     <string name="main_activity_run">Run</string>
     <string name="main_activity_stop">Stop</string>