Removed unnecessary file creation.

* Testing loading files from chunks.
* Removed the `PLAY_ASSET_FILE` file tag from BuildConfig file as now we are using chunks for loading zim file from asset folder.

buildSrc/src/main/kotlin/custom/CustomApps.kt

@@ -46,8 +46,6 @@ fun ProductFlavors.create(customApps: List<CustomApp>) {
       applicationIdSuffix = ".kiwixcustom${customApp.name}"
       buildConfigField("String", "ZIM_URL", "\"${customApp.url}\"")
       buildConfigField("String", "ENFORCED_LANG", "\"${customApp.enforcedLanguage}\"")
-      // Add asset file name in buildConfig file, we will use later to receive the zim file.
-      buildConfigField("String", "PLAY_ASSET_FILE", "\"${customApp.name}.zim\"")
       buildConfigField("Boolean", "DISABLE_SIDEBAR", "${customApp.disableSideBar}")
       buildConfigField("Boolean", "DISABLE_TABS", "${customApp.disableTabs}")
       buildConfigField("Boolean", "DISABLE_READ_ALOUD", "${customApp.disableReadAloud}")

custom/build.gradle.kts

@@ -34,7 +34,7 @@ android {
         createDownloadTask(it)
         createPublishApkWithExpansionTask(it, applicationVariants)
       }
-      File("$projectDir/../install_time_asset/src/main/assets", "$name.zim").let {
+      File("$projectDir/../install_time_asset/src/main/assets").let {
         createDownloadTaskForPlayAssetDelivery(it)
         createPublishBundleWithAssetPlayDelivery()
       }
@@ -114,7 +114,7 @@ fun writeZimFileData(responseBody: ResponseBody, file: File, chunkSize: Long = 1
     while (inputStream.read(buffer).also { bytesRead = it } != -1) {
       if (outputStream == null) {
         // Create a new chunk file
-        val nextChunkFile = File(file.parent, "chunk$chunkNumber.zim")
+        val nextChunkFile = File(file.path, "chunk$chunkNumber.zim")
         nextChunkFile.createNewFile()
         outputStream = FileOutputStream(nextChunkFile)
       }
@@ -151,8 +151,6 @@ fun ProductFlavor.createDownloadTaskForPlayAssetDelivery(
   ) {
     group = "Downloading"
     doLast {
-      if (file.exists()) file.delete()
-      file.createNewFile()
 
       OkHttpClient().newCall(fetchRequest()).execute().use { response ->
         if (response.isSuccessful) {

custom/src/main/java/org/kiwix/kiwixmobile/custom/main/CustomFileValidator.kt

@@ -22,8 +22,11 @@ import android.content.Context
 import android.content.pm.PackageManager
 import android.content.res.AssetFileDescriptor
 import android.content.res.AssetManager
+import android.os.ParcelFileDescriptor
 import android.util.Log
 import androidx.core.content.ContextCompat
+import org.kiwix.kiwixmobile.core.extensions.deleteFile
+import org.kiwix.kiwixmobile.core.extensions.isFileExist
 import org.kiwix.kiwixmobile.core.utils.files.FileUtils
 import org.kiwix.kiwixmobile.custom.main.ValidationState.HasBothFiles
 import org.kiwix.kiwixmobile.custom.main.ValidationState.HasFile
@@ -66,6 +69,9 @@ class CustomFileValidator @Inject constructor(private val context: Context) {
         assetFileDescriptorList.add(assetManager.openFd(it))
       }
       val combinedFilePath = FileUtils.getDemoFilePathForCustomApp(context)
+      val demoFile = File(combinedFilePath)
+      if (demoFile.isFileExist()) demoFile.deleteFile()
+      demoFile.createNewFile()
       val combinedFileOutputStream = FileOutputStream(combinedFilePath)
       val chunkSize = 100 * 1024 * 1024
 
@@ -87,8 +93,14 @@ class CustomFileValidator @Inject constructor(private val context: Context) {
 
         chunkFileInputStream.close()
       }
-
-      return assetFileDescriptorList[0]
+      return AssetFileDescriptor(
+        ParcelFileDescriptor.open(
+          demoFile,
+          ParcelFileDescriptor.MODE_READ_ONLY
+        ),
+        0L,
+        demoFile.length()
+      )
     } catch (packageNameNotFoundException: PackageManager.NameNotFoundException) {
       Log.w(
         "ASSET_PACKAGE_DELIVERY",