adding some more generic boilerplate code

app/src/main/kotlin/com/simplemobiletools/smsmessenger/App.kt

@@ -0,0 +1,11 @@
+package com.simplemobiletools.smsmessenger
+
+import android.app.Application
+import com.simplemobiletools.commons.extensions.checkUseEnglish
+
+class App : Application() {
+    override fun onCreate() {
+        super.onCreate()
+        checkUseEnglish()
+    }
+}

app/src/main/kotlin/com/simplemobiletools/smsmessenger/activities/MainActivity.kt

@@ -1,13 +1,20 @@
 package com.simplemobiletools.smsmessenger.activities
 
 import android.os.Bundle
-import androidx.appcompat.app.AppCompatActivity
+import com.simplemobiletools.commons.extensions.appLaunched
+import com.simplemobiletools.commons.extensions.checkAppSideloading
+import com.simplemobiletools.smsmessenger.BuildConfig
 import com.simplemobiletools.smsmessenger.R
 
-class MainActivity : AppCompatActivity() {
+class MainActivity : SimpleActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+        appLaunched(BuildConfig.APPLICATION_ID)
+
+        if (checkAppSideloading()) {
+            return
+        }
     }
 }

app/src/main/kotlin/com/simplemobiletools/smsmessenger/activities/SimpleActivity.kt

@@ -0,0 +1,12 @@
+package com.simplemobiletools.smsmessenger.activities
+
+import com.simplemobiletools.commons.activities.BaseSimpleActivity
+import com.simplemobiletools.smsmessenger.R
+
+open class SimpleActivity : BaseSimpleActivity() {
+    override fun getAppIconIDs() = arrayListOf(
+        R.mipmap.ic_launcher
+    )
+
+    override fun getAppLauncherName() = getString(R.string.app_launcher_name)
+}

app/src/main/kotlin/com/simplemobiletools/smsmessenger/activities/SplashActivity.kt

@@ -0,0 +1,11 @@
+package com.simplemobiletools.smsmessenger.activities
+
+import android.content.Intent
+import com.simplemobiletools.commons.activities.BaseSplashActivity
+
+class SplashActivity : BaseSplashActivity() {
+    override fun initActivity() {
+        startActivity(Intent(this, MainActivity::class.java))
+        finish()
+    }
+}