Android Intent Import And Read File
April 20, 2018Intent.ACTION_GET_CONTENT
Use Intent.ACTION_GET_CONTENT to import or read file.
val intent = Intent(Intent.ACTION_GET_CONTENT)
// intent.type = "file/*"
intent.type = "application/octet-stream"
activity.startActivityForResult(intent, FILE_REQUEST_CODE)
Edit AndroidManifest.xml
to allow reading of open/import file.
<?xml version="1.0" encoding="utf-8"?>
<manifest ...>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
</manifest>
Override Activity.onActivityResult to handle the file request.
Use [ContentResolver.openInputStream] to read input stream / the file.
class BackupActivity : AppCompatActivity() {
companion object {
private const val FILE_REQUEST_CODE = 1
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (requestCode == FILE_REQUEST_CODE) {
if (resultCode == Activity.RESULT_OK) {
val uri = data?.data
if (uri != null) {
val inputStream = contentResolver.openInputStream(uri)
// copy input stream to file
val outputFile = File(context.cacheDir, "output.txt")
val outputStream = FileOutputStream(outputFile)
inputStream.use { input ->
outputStream.use { output ->
input.copyTo(output)
}
}
// copy input stream to bytearray/string
/*
val outputStream = ByteArrayOutputStream()
inputStream.use { input ->
outputStream.use { output ->
input.copyTo(output)
}
}
val byteArray = outputStream.toByteArray()
val outputString = String(byteArray, Charsets.UTF_8)
*/
}
else {
Toast.makeText(this, "No Data", Toast.LENGTH_LONG).show()
}
}
else {
Toast.makeText(this, "No Result", Toast.LENGTH_LONG).show()
}
}
}
}
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