File access and storage in Android Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to open a file for writing in internal storage.

Android Kotlin

val fileOutput = openFileOutput("myfile.txt", [1])

Drag options to blanks, or click blank then click option'

AContext.MODE_WORLD_READABLE

BContext.MODE_APPEND

CContext.MODE_MULTI_PROCESS

DContext.MODE_PRIVATE

Attempts:

3 left

💡 Hint

Common Mistakes

Using append mode when you want to overwrite

Using deprecated or insecure modes

Use Context.MODE_PRIVATE to create or open a file that is private to your app.

2fill in blank

medium

Complete the code to read text from a file in internal storage.

Android Kotlin

val inputStream = openFileInput("myfile.txt")
val text = inputStream.bufferedReader().use { it.[1]() }

Drag options to blanks, or click blank then click option'

AreadLines

BreadText

CreadBytes

DreadChars

Attempts:

3 left

💡 Hint

Common Mistakes

Using readLines() which returns a list of strings

Using readBytes() which returns bytes, not string

readText() reads the entire content of the file as a single string.

3fill in blank

hard

Fix the error in the code to write a string to a file safely.

Android Kotlin

val fileOutput = openFileOutput("data.txt", Context.MODE_PRIVATE)
fileOutput.[1]("Hello World".toByteArray())
fileOutput.close()

Drag options to blanks, or click blank then click option'

Aclose

Bflush

Cwrite

Dread

Attempts:

3 left

💡 Hint

Common Mistakes

Using flush() instead of write()

Trying to read from output stream

Use write() to write bytes to the file output stream.

4fill in blank

hard

Fill both blanks to check if a file exists and delete it.

Android Kotlin

val file = File(filesDir, "temp.txt")
if (file.[1]()) {
  file.[2]()
}

Drag options to blanks, or click blank then click option'

Aexists

Bdelete

CcreateNewFile

DisFile

Attempts:

3 left

💡 Hint

Common Mistakes

Using createNewFile() instead of delete()

Checking isFile() which only checks type, not existence

Use exists() to check if the file is there, and delete() to remove it.

5fill in blank

hard

Fill all three blanks to write and then read a string from a file.

Android Kotlin

val filename = "log.txt"
val output = openFileOutput(filename, [1])
output.write("Test Entry".toByteArray())
output.close()

val input = openFileInput(filename)
val content = input.bufferedReader().[2] { it.[3]() }

Drag options to blanks, or click blank then click option'

AContext.MODE_PRIVATE

BreadText

Cuse

DContext.MODE_APPEND

Attempts:

3 left

💡 Hint

Common Mistakes

Using append mode when overwriting is intended

Not closing streams properly

Using readLines() instead of readText()

Use Context.MODE_PRIVATE to open the file for writing, then use to safely handle the reader, and readText() to get the file content as a string.