Added stream-based file handling from uri

app/src/main/java/com/daniebeler/pfpixelix/utils/GetFile.kt

@@ -2,23 +2,44 @@ package com.daniebeler.pfpixelix.utils
 
 import android.content.Context
 import android.net.Uri
-import android.provider.MediaStore
 import java.io.File
+import java.io.FileOutputStream
+import java.io.IOException
+import java.io.InputStream
+import java.io.OutputStream
 
 object GetFile {
     fun getFile(uri: Uri, context: Context): File? {
+        // Retrieves a file from URI, copies it and returns the copied file
+        val fileName = getFileName(uri)
+        if (!fileName.isNullOrEmpty()) {
+            val copyFile = File(context.getExternalFilesDir("Pixelix"), fileName)
+            copy(context, uri, copyFile)
+            return File(copyFile.absolutePath)
+        }
+        return null
+    }
 
-        val contentResolver = context.contentResolver
-
-        val cursor = contentResolver.query(uri, null, null, null, null)
-        cursor?.use {
-            if (it.moveToFirst()) {
-                val columnIndex = it.getColumnIndexOrThrow(MediaStore.Images.Media.DATA)
-                val filePath = it.getString(columnIndex)
+    private fun getFileName(uri: Uri): String? {
+        // Extract file name from given Uri
+        val path = uri.path ?: return null
+        val lastSlashIndex = path.lastIndexOf("/")
+        return if (lastSlashIndex != -1) path.substring(lastSlashIndex + 1) else null
+    }
 
-                return File(filePath)
+    private fun copy(context: Context, uri: Uri, file: File) {
+        // copy the contents of a file from the uri to the destination file
+        try {
+            val inputStream: InputStream? = context.contentResolver.openInputStream(uri)
+            inputStream?.use { input ->
+                val outputStream: OutputStream = FileOutputStream(file)
+                outputStream.use { output ->
+                    input.buffered().copyTo(output.buffered())
+                }
             }
         }
-        return null
+        catch (e: IOException) {
+            e.printStackTrace()
+        }
     }
 }