[O] Preference by delegate

app/build.gradle

@@ -42,6 +42,10 @@ dependencies {
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
     implementation 'androidx.navigation:navigation-fragment-ktx:2.5.3'
     implementation 'androidx.navigation:navigation-ui-ktx:2.5.3'
+    implementation 'androidx.preference:preference:1.2.0'
+
+    // https://mvnrepository.com/artifact/org.jetbrains.kotlin/kotlin-reflect
+    implementation "org.jetbrains.kotlin:kotlin-reflect:1.8.0"
 
     // Logger
     implementation 'com.jakewharton.timber:timber:5.0.1'
@@ -51,7 +55,6 @@ dependencies {
 
     // Database library
     implementation "com.influxdb:influxdb-client-kotlin:6.3.0"
-    implementation 'androidx.preference:preference:1.2.0'
 
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.5'

app/src/main/java/org/hydev/wearsync/ActivityScan.kt

@@ -31,7 +31,7 @@ class ActivityScan : AppCompatActivity() {
         println("OnCreate called, Initializing...")
 
         // Device exists
-        chosenDevice?.let { addr ->
+        prefs.chosenDevice?.let { addr ->
             ble.connectAddress(addr) { connected(addr) }
             return
         }
@@ -86,7 +86,7 @@ class ActivityScan : AppCompatActivity() {
     fun connected(address: String)
     {
         view.snack("✅ Connected.")
-        chosenDevice = address
+        prefs.chosenDevice = address
         finish()
     }
 }

app/src/main/java/org/hydev/wearsync/Extensions.kt

@@ -6,7 +6,12 @@ import android.content.Context
 import android.content.Intent
 import android.view.View
 import androidx.core.content.edit
+import androidx.preference.PreferenceManager
 import com.google.android.material.snackbar.Snackbar
+import com.influxdb.client.kotlin.InfluxDBClientKotlin
+import com.influxdb.client.kotlin.InfluxDBClientKotlinFactory
+import kotlin.reflect.KProperty
+
 
 fun View.snack(msg: String) = Snackbar.make(this, msg, Snackbar.LENGTH_LONG)
     .setAction("Action", null).show()
@@ -14,9 +19,36 @@ fun View.snack(msg: String) = Snackbar.make(this, msg, Snackbar.LENGTH_LONG)
 inline fun <reified T> Context.getSysServ() = getSystemService(T::class.java) as T
 fun Context.blueMan() = getSysServ<BluetoothManager>()
 
-val Context.pref get() = getSharedPreferences("settings", Context.MODE_PRIVATE)
+
-var Context.chosenDevice: String?
+
-    get() = pref.getString("mac", null)
+interface Prefs {
-    set(value) = pref.edit { putString("mac", value) }
+    var chosenDevice: String?
+
+    var infUrl: String?
+    var infOrg: String?
+    var infBucket: String?
+    var infToken: String?
+
+    fun createInflux(): InfluxDBClientKotlin
+}
+
+val Context.pref get() = PreferenceManager.getDefaultSharedPreferences(this)
+val Context.prefs get() = object : Prefs {
+    inner class PrefDelegate {
+        operator fun getValue(thisRef: Any?, property: KProperty<*>) = pref.getString(property.name, null)
+        operator fun setValue(thisRef: Any?, property: KProperty<*>, value: String?) {
+            pref.edit { putString(property.name, value) }
+        }
+    }
+
+    override var chosenDevice by PrefDelegate()
+    override var infUrl by PrefDelegate()
+    override var infOrg by PrefDelegate()
+    override var infBucket by PrefDelegate()
+    override var infToken by PrefDelegate()
+
+    override fun createInflux() = InfluxDBClientKotlinFactory
+        .create(infUrl ?: "", (infToken ?: "").toCharArray(), infOrg ?: "", infBucket ?: "")
+}
 
 inline fun <reified T : Activity> Context.act() = startActivity(Intent(this, T::class.java))

app/src/main/java/org/hydev/wearsync/MainActivity.kt

@@ -8,6 +8,8 @@ import android.view.Menu
 import android.view.MenuItem
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.AppCompatActivity
+import com.influxdb.client.domain.WritePrecision
+import com.influxdb.client.kotlin.InfluxDBClientKotlinFactory
 import kotlinx.coroutines.*
 import kotlinx.coroutines.flow.consumeAsFlow
 import org.hydev.wearsync.ActivityPermissions.Companion.hasPermissions
@@ -23,15 +25,9 @@ class MainActivity : AppCompatActivity()
 {
     lateinit var binding: ActivityMainBinding
 
-    val enableBluetoothRequest =
+    val enableBluetoothRequest = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {
-        registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {
+        if (it.resultCode != RESULT_OK) ensureBluetooth()
-            if (it.resultCode == RESULT_OK) {
+    }
-                // Bluetooth has been enabled
-            } else {
-                // Bluetooth has not been enabled, try again
-                ensureBluetooth()
-            }
-        }
 
     fun ensureBluetooth() {
         if (blueMan().adapter?.isEnabled == false)
@@ -73,7 +69,10 @@ class MainActivity : AppCompatActivity()
     {
         return when (item.itemId)
         {
-            R.id.action_settings -> true
+            R.id.action_settings -> {
+                act<ActivitySettings>()
+                true
+            }
             R.id.action_scan -> {
                 act<ActivityScan>()
                 true