fix interrupt package list on back press

app/src/main/java/com/github/bmx666/appcachecleaner/AppCacheCleanerActivity.kt

@@ -166,6 +166,22 @@ class AppCacheCleanerActivity : AppCompatActivity() {
  }
 
  override fun onBackPressed() {
+ if (loadingPkgList.get()) {
+ loadingPkgList.set(false)
+
+ binding.fragmentContainerView.visibility = View.GONE
+ binding.layoutFab.visibility = View.GONE
+ binding.layoutProgress.visibility = View.GONE
+
+ binding.btnCleanUserAppCache.isEnabled = true
+ binding.btnCleanSystemAppCache.isEnabled = true
+ binding.btnCleanAllAppCache.isEnabled = true
+
+ binding.layoutButton.visibility = View.VISIBLE
+
+ return
+ }
+
  supportFragmentManager.findFragmentByTag(FRAGMENT_PACKAGE_LIST_TAG)?.let { fragment ->
 
  binding.fragmentContainerView.visibility = View.GONE
@@ -323,6 +339,9 @@ class AppCacheCleanerActivity : AppCompatActivity() {
  private fun addPackageToPlaceholderContent() {
  PlaceholderContent.ITEMS.clear()
  pkgInfoListFragment.forEach { pkgInfo ->
+
+ if (!loadingPkgList.get()) return
+
  var localizedLabel: String? = null
  packageManager?.let { pm ->
  try {
@@ -363,6 +382,8 @@ class AppCacheCleanerActivity : AppCompatActivity() {
  FRAGMENT_PACKAGE_LIST_TAG
  )
  .commitNow()
+
+ loadingPkgList.set(false)
  }
  }
 
@@ -396,6 +417,8 @@ class AppCacheCleanerActivity : AppCompatActivity() {
  binding.progressBarPackageList.max = pkgInfoListFragment.size
  binding.layoutProgress.visibility = View.VISIBLE
 
+ loadingPkgList.set(true)
+
  CoroutineScope(IO).launch {
  addPackageToPlaceholderContent()
  }
@@ -410,6 +433,7 @@ class AppCacheCleanerActivity : AppCompatActivity() {
  const val SETTINGS_CHECKED_PACKAGE_LIST_TAG = "package-list"
  const val SETTINGS_CHECKED_PACKAGE_TAG = "checked"
 
+ val loadingPkgList = AtomicBoolean(false)
  val cleanAppCacheFinished = AtomicBoolean(false)
  val cleanCacheFinished = AtomicBoolean(true)
  val cleanCacheInterrupt = AtomicBoolean(false)