android 11中/storage/emulated/路径下的read.txt字段数据

Question

I want to read data from .txt file from /storage/emulated application-specific path. I have written data successfully in same file but not able to read it.

Code to write data in txt file.

val writer: FileOutputStream = openFileOutput(file.absolutePath, MODE_PRIVATE)
writer.write(str1.toByteArray())
writer.flush()
writer.close()

Trying to read data from same file.

val text = StringBuilder()
val br = BufferedReader(FileReader(file))
var line: String?
while (br.readLine().also { line = it } != null) {
 text.append(line)
 text.append('\n')
 }
 br.close()

line returning null value.

Answer 1

Try adding android:requestLegacyExternalStorage="true" to your manifest.

Or change it to comply to Android 11's new scoped storage system. Seehttps://developer.android.com/about/versions/11/privacy/storage

Answer 2

I want to read data from.txt file from /storage/emulated application-specific path. I have written data successfully in same file but not able to read it.

You did not write to a location in a /storage/emulated directory. You used openFileOutput() . That writes to a different location. To read from that location, use openFileInput() , the corresponding method on Context . Be sure to use the same filename that you passed to openFileOutput() .

Answer 3

You should write to the location /storage/emulated directory. You avhave used openFileOutput() . It points to where getFilesDir() on Context returns. You can tell this because the documentation says:

Returns the absolute path to the directory on the filesystem where files created with openFileOutput(String, int) are stored.

To read from your location, use openFileInput() , the corresponding method on Context with the same filename that you had passsed to the openFileOutput() .