I am developing an android app and having trouble with the permission handling (API lvl 30)
I tried to follow the steps here: https://developer.android.com/training/permissions/requesting.html
When using the "checkSelfPermission()" function, it looks like I have the necessary permissions, but when trying to Write to a file I get the error mentioned above.
This is my code:
class FilesActivity : AppCompatActivity() {
val requestPermissionLauncher =
registerForActivityResult(ActivityResultContracts.RequestPermission()) { isGranted: Boolean ->
if (isGranted) {
Log.d("access granted", isGranted.toString())
} else {
Log.d("access granted", isGranted.toString())
}
}
private lateinit var binding: ActivityFilesBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
requestPermissions()
The method which checks the permissions looks like this:
private fun requestPermissions() {
when {
ContextCompat.checkSelfPermission(
this,
Manifest.permission.WRITE_EXTERNAL_STORAGE
) == PackageManager.PERMISSION_GRANTED -> {
Log.d("Permission","Already granted")
}
else -> {
requestPermissionLauncher.launch(
Manifest.permission.WRITE_EXTERNAL_STORAGE
)
}
}
}
I get the Permissions-prompt and after granting permission I try to download a file. The code for downloading the file is in an adapter-class for a recyclerview.
try{
if(ContextCompat.checkSelfPermission(
mContext,
Manifest.permission.WRITE_EXTERNAL_STORAGE
) == PackageManager.PERMISSION_GRANTED) {
val myFile = File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS),file.getFilename()!!)
val fileRef = Firebase.storage.getReferenceFromUrl(file.getUrl()!!)
fileRef.getFile(myFile).addOnSuccessListener {
// Local temp file has been created
Toast.makeText(mContext,"File downloaded to Downloads Dir.",Toast.LENGTH_LONG).show()
}.addOnFailureListener {
Toast.makeText(mContext,it.toString(),Toast.LENGTH_LONG).show()
}
}
} catch(e :Error){
Toast.makeText(mContext,e.toString(),Toast.LENGTH_LONG).show()
}
I am not sure, what I did wrong. Maybe someone here can help me. Thanks in advance
CodePudding user response：
You haven't shown us your AndroidManifest.xml file, so it might be worth checking if you have added the necessary permissions in this file.
CodePudding user response：
Extends ActivityCompat.OnRequestPermissionsResultCallback is not available in FilesActivity class.
class FilesActivity : AppCompatActivity() , ActivityCompat.OnRequestPermissionsResultCallback {
}
You need to call the ActivityCompat.OnRequestPermissionsResultCallback interface for the requestPermissionLauncher definition.
Sample Code :
class MainActivity : AppCompatActivity(), ActivityCompat.OnRequestPermissionsResultCallback {
private val requestPermissionLauncher = registerForActivityResult(
ActivityResultContracts.RequestPermission()
) { isGranted: Boolean ->
if (isGranted) {
// Permission has been granted. Start camera preview Activity.
startCamera()
} else {
// Permission request was denied.
requestPermissions()
}
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
requestPermissions()
}
private fun requestPermissions() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
== PackageManager.PERMISSION_GRANTED) {
// Permission has been granted. Start camera preview Activity.
startCamera()
} else requestPermissionLauncher.launch(Manifest.permission.CAMERA)
}
private fun startCamera() {
val intent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
startActivity(intent)
}
}