Add dark and light theme with corresponding settings activity and BaseActivity class

app/src/main/java/com/illusionware/npsbrowser/activities/AppsListActivity.kt

@@ -4,7 +4,6 @@ import android.content.Intent
 import android.os.Bundle
 import android.view.View
 import android.widget.Toast
-import androidx.appcompat.app.AppCompatActivity
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import com.illusionware.npsbrowser.AppData
@@ -12,7 +11,7 @@ import com.illusionware.npsbrowser.RecyclerTouchListener
 import com.illusionware.npsbrowser.adapters.AppAdapter
 import com.illusionware.npsbrowser.databinding.ActivityAppsListBinding
 
-class AppsListActivity : AppCompatActivity() {
+class AppsListActivity : BaseActivity() {
     companion object {
         lateinit var apps : ArrayList<AppData>
     }

app/src/main/java/com/illusionware/npsbrowser/activities/BaseActivity.kt

@@ -0,0 +1,40 @@
+package com.illusionware.npsbrowser.activities
+
+import android.content.SharedPreferences
+import android.content.res.Configuration
+import android.os.Bundle
+import android.view.View
+import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.app.AppCompatDelegate
+import androidx.preference.PreferenceManager
+import com.illusionware.npsbrowser.R
+
+open class BaseActivity : AppCompatActivity() {
+
+    private lateinit var sharedPreferences : SharedPreferences
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        PreferenceManager.setDefaultValues(this, R.xml.root_preferences, false)
+        sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this)
+        val decor: View = window.decorView
+
+        AppCompatDelegate.setDefaultNightMode(when ((sharedPreferences.getString("app_theme", "2")?.toInt())) {
+            0 ->  {
+                decor.systemUiVisibility = View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR;
+                AppCompatDelegate.MODE_NIGHT_NO
+            }
+            1 -> {
+                decor.systemUiVisibility = 0;
+                AppCompatDelegate.MODE_NIGHT_YES
+            }
+            2 -> {
+                decor.systemUiVisibility = if (resources.configuration.uiMode and
+                    Configuration.UI_MODE_NIGHT_MASK == Configuration.UI_MODE_NIGHT_YES) 0 else View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR
+                AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM
+            }
+            else -> AppCompatDelegate.MODE_NIGHT_UNSPECIFIED
+        })
+    }
+}

app/src/main/java/com/illusionware/npsbrowser/activities/MainActivity.kt

@@ -16,7 +16,7 @@ import com.illusionware.npsbrowser.databinding.ActivityMainBinding
 import kotlinx.android.synthetic.main.appbar.*
 import java.io.InputStream
 
-class MainActivity : AppCompatActivity() {
+class MainActivity : BaseActivity() {
 
     private val tsvReader = csvReader {
         charset = "UTF-8"
@@ -52,6 +52,8 @@ class MainActivity : AppCompatActivity() {
     override fun onOptionsItemSelected(item: MenuItem): Boolean {
         return when (item.itemId) {
             R.id.action_settings -> {
+                val settingsIntent = Intent(this, SettingsActivity::class.java)
+                startActivity(settingsIntent)
                 true
             }
             else -> return super.onOptionsItemSelected(item)
@@ -65,7 +67,7 @@ class MainActivity : AppCompatActivity() {
                 val inputStream: InputStream? = contentResolver.openInputStream(uri)
                 val entries : List<Map<String, String?>> = tsvReader.readAllWithHeader(inputStream!!)
                 val myIntent = Intent(this, AppsListActivity::class.java)
-                var apps = ArrayList<AppData>(entries.size)
+                val apps = ArrayList<AppData>(entries.size)
 
                 entries.forEach { entry ->
                     if (entry["Name"].isNullOrEmpty()) {
@@ -81,7 +83,7 @@ class MainActivity : AppCompatActivity() {
                     val fileSize = entry["File Size"]?.toLongOrNull()
                     val sha256 = entry["SHA256"]
                     val minFW = entry["Required FW"]
-                    var app = AppData(id, region, name, link ?: "MISSING", license ?: "MISSING",
+                    val app = AppData(id, region, name, link ?: "MISSING", license ?: "MISSING",
                         contentID ?: "MISSING", lastDateTime ?: "MISSING",
                         fileSize ?: 0, sha256 ?: "MISSING", minFW)
                     apps.add(app)

app/src/main/java/com/illusionware/npsbrowser/activities/SettingsActivity.kt

@@ -0,0 +1,35 @@
+package com.illusionware.npsbrowser.activities
+
+import android.os.Bundle
+import androidx.preference.PreferenceFragmentCompat
+import androidx.preference.PreferenceManager
+import com.illusionware.npsbrowser.R
+import com.illusionware.npsbrowser.databinding.SettingsActivityBinding
+import kotlinx.android.synthetic.main.appbar.*
+
+class SettingsActivity : BaseActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        val binding = SettingsActivityBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        setSupportActionBar(toolbar)
+
+        supportFragmentManager
+            .beginTransaction()
+            .replace(
+                R.id.settings,
+                SettingsFragment()
+            )
+            .commit()
+        supportActionBar?.setDisplayHomeAsUpEnabled(true)
+    }
+
+    class SettingsFragment : PreferenceFragmentCompat() {
+        override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
+            setPreferencesFromResource(R.xml.root_preferences, rootKey)
+            PreferenceManager.setDefaultValues(context, R.xml.root_preferences, false);
+        }
+    }
+}

app/src/main/java/com/illusionware/npsbrowser/activities/SingleAppActivity.kt

@@ -1,11 +1,10 @@
 package com.illusionware.npsbrowser.activities
 
 import android.os.Bundle
-import androidx.appcompat.app.AppCompatActivity
 import com.illusionware.npsbrowser.AppData
 import com.illusionware.npsbrowser.databinding.ActivitySingleAppBinding
 
-class SingleAppActivity: AppCompatActivity() {
+class SingleAppActivity: BaseActivity() {
     companion object {
         lateinit var app : AppData
     }