File Copy Implementation

app/build.gradle

@@ -11,7 +11,6 @@ android {
         targetSdkVersion 33
         versionCode 2
         versionName "1.1"
-        multiDexEnabled true
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
 
@@ -45,6 +44,5 @@ dependencies {
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
-    implementation 'com.android.support:multidex:2.0.0'
     implementation project(":pdfViewer")
 }

app/src/main/AndroidManifest.xml

@@ -1,12 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
     package="com.rajat.sample.pdfviewer">
 
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_MEDIA_LOCATION" />
-    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
-        tools:ignore="ScopedStorage" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.READ_PHONE_STATE" />
 

pdfViewer/build.gradle

@@ -8,7 +8,6 @@ android {
     defaultConfig {
         minSdkVersion 16
         targetSdkVersion 33
-        multiDexEnabled true
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         consumerProguardFiles "consumer-rules.pro"
     }
@@ -46,7 +45,7 @@ dependencies {
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.3"
     implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.3'
     implementation 'com.google.android.material:material:1.7.0'
-    implementation "androidx.multidex:multidex:2.0.1"
+
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.4'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.0'

pdfViewer/src/main/AndroidManifest.xml

@@ -2,8 +2,6 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.rajat.pdfviewer">
 
-    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
-    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_MEDIA_LOCATION" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

pdfViewer/src/main/java/com/rajat/pdfviewer/PdfViewerActivity.kt

@@ -24,6 +24,7 @@ import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.app.ActivityCompat
 import androidx.core.content.ContextCompat
+import com.rajat.pdfviewer.util.FileUtils.copyFile
 import kotlinx.android.synthetic.main.activity_pdf_viewer.*
 import kotlinx.android.synthetic.main.pdf_view_tool_bar.*
 import java.io.File
@@ -286,11 +287,15 @@ class PdfViewerActivity : AppCompatActivity() {
     }
 
     private fun checkPermissionOnInit() {
-        if (ContextCompat.checkSelfPermission(
-                this,
-                permission.WRITE_EXTERNAL_STORAGE
-            ) === PackageManager.PERMISSION_GRANTED
-        ) {
+        if(Build.VERSION.SDK_INT < Build.VERSION_CODES.R){
+            if (ContextCompat.checkSelfPermission(
+                    this,
+                    permission.WRITE_EXTERNAL_STORAGE
+                ) == PackageManager.PERMISSION_GRANTED
+            ) {
+                permissionGranted = true
+            }
+        }else{
             permissionGranted = true
         }
     }
@@ -326,14 +331,20 @@ class PdfViewerActivity : AppCompatActivity() {
                     if (TextUtils.isEmpty(directoryName)) "/$fileName.pdf" else "/$directoryName/$fileName.pdf"
 
                 try {
-                    if (isPDFFromPath) {
+                    if (isPDFFromPath)
+                        if (isFromAssets)
                         com.rajat.pdfviewer.util.FileUtils.downloadFile(
                             this,
                             fileUrl!!,
                             directoryName!!,
-                            fileName
-                        )
-                    } else {
+                            fileName)
+                        else {
+                            copyFile(fileUrl!!, directoryName!!, fileName!!)
+                            Toast.makeText(this,
+                                "PDF successfully saved to $directoryName/$fileName.pdf",
+                                Toast.LENGTH_LONG).show()
+                        }
+                    else {
                         val downloadUrl = Uri.parse(fileUrl)
                         val downloadManger =
                             getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager?
@@ -366,6 +377,7 @@ class PdfViewerActivity : AppCompatActivity() {
                         "Unable to download file",
                         Toast.LENGTH_SHORT
                     ).show()
+                    e.printStackTrace()
                 }
             } else {
                 checkPermissionOnInit()
@@ -377,14 +389,20 @@ class PdfViewerActivity : AppCompatActivity() {
     }
 
     private fun checkPermission(requestCode: Int) {
-        if (ContextCompat.checkSelfPermission(this, permission.WRITE_EXTERNAL_STORAGE)
-            == PackageManager.PERMISSION_DENIED
-        ) {
-            ActivityCompat.requestPermissions(
-                this, arrayOf(permission.WRITE_EXTERNAL_STORAGE),
-                requestCode
-            )
-        } else {
+        if(Build.VERSION.SDK_INT < Build.VERSION_CODES.R) {
+            if (ContextCompat.checkSelfPermission(this, permission.WRITE_EXTERNAL_STORAGE)
+                == PackageManager.PERMISSION_DENIED
+            ) {
+                ActivityCompat.requestPermissions(
+                    this, arrayOf(permission.WRITE_EXTERNAL_STORAGE),
+                    requestCode
+                )
+            } else {
+                permissionGranted = true
+                downloadPdf()
+            }
+        }
+        else {
             permissionGranted = true
             downloadPdf()
         }
@@ -396,10 +414,16 @@ class PdfViewerActivity : AppCompatActivity() {
         grantResults: IntArray
     ) {
         super.onRequestPermissionsResult(requestCode, permissions, grantResults)
-        if (requestCode == PERMISSION_CODE &&
-            grantResults.isNotEmpty() &&
-            grantResults[0] == PackageManager.PERMISSION_GRANTED
-        ) {
+        if(Build.VERSION.SDK_INT < Build.VERSION_CODES.R) {
+            if (requestCode == PERMISSION_CODE &&
+                grantResults.isNotEmpty() &&
+                grantResults[0] == PackageManager.PERMISSION_GRANTED
+            ) {
+                permissionGranted = true
+                downloadPdf()
+            }
+        }
+        else {
             permissionGranted = true
             downloadPdf()
         }

pdfViewer/src/main/java/com/rajat/pdfviewer/util/FileUtils.kt

@@ -2,8 +2,8 @@ package com.rajat.pdfviewer.util
 
 import android.content.Context
 import android.os.Environment
-import android.provider.MediaStore
-import android.text.TextUtils
+import android.os.Environment.DIRECTORY_DOWNLOADS
+import android.os.Environment.getExternalStoragePublicDirectory
 import java.io.*
 
 object FileUtils {
@@ -37,15 +37,22 @@ object FileUtils {
     }
 
     @Throws(IOException::class)
-    fun downloadFile(context: Context, assetName: String, filePath: String, fileName: String?){
-
-       val dirPath = "${Environment.getExternalStorageDirectory()}/${filePath}"
+    fun downloadFile(context: Context, assetName: String, filePath: String, fileName: String?) {
+       val dirPath = "${Environment.getExternalStorageDirectory()}/$filePath"
         val outFile = File(dirPath)
-        //Create New File if not present
+        // Create New File if not present
         if (!outFile.exists()) {
             outFile.mkdirs()
         }
+
         val outFile1 = File(dirPath, "/$fileName.pdf")
         copy(context.assets.open(assetName), outFile1)
     }
-}
+
+    fun copyFile(fullPath: String, destPath: String?, fileName: String) {
+        val outFile = File(destPath
+            ?: getExternalStoragePublicDirectory(
+                DIRECTORY_DOWNLOADS).path, "/$fileName.pdf")
+        File(fullPath).copyTo(outFile, true)
+    }
+}