Fragmente müssen vor ihrer Erstellung das Register registerForActivityResult() aufrufen ⇐ Android

[Anonymous]

Ich arbeite an einer Einkaufs-App und habe ein Fragment zum Hinzufügen von Produkten zur Produktliste erstellt.
Ich muss eine externe Speicherberechtigung lesen, um ein Foto zu Produkten hinzuzufügen, also versuche ich, registerForActivityResult() in meinem Fragment zu verwenden, erhalte aber eine Fehlermeldung.
Ich bin neu in der Android-Programmierung und weiß daher nicht, ob ich sie richtig verwende.
Ich habe jede Antwort aus anderen Fragen ausprobiert Ich habe es gefunden, aber sie haben nicht funktioniert.
Fehlermeldung:

Code: Select all

IllegalStateException: Fragment AddActivity after being created. Fragments must call rHgS5orgPvsuzJ7shn8vw28y1XaePY4uDP() before they are created (i.e.  initialization, onAttach(), or onCreate()).
at androidx.fragment.app.Fragment.prepareCallInternal(Fragment.java:3482)
at androidx.fragment.app.Fragment.rHgS5orgPvsuzJ7shn8vw28y1XaePY4uDP(Fragment.java:3449)
at com.example.TheDentalSupplies.AddActivity.showImageChooser(AddActivity.kt:120)
at com.example.TheDentalSupplies.AddActivity.requestPermission(AddActivity.kt:96)
at com.example.TheDentalSupplies.AddActivity.onViewCreated$lambda-1(AddActivity.kt:66)
at com.example.TheDentalSupplies.AddActivity.lambda$gx8TAUa5Jk3WDkvGOWG0oB39kiM(Unknown Source:0)
at com.example.TheDentalSupplies.-$$Lambda$AddActivity$gx8TAUa5Jk3WDkvGOWG0oB39kiM.onClick(Unknown Source:4)
at android.view.View.performClick(View.java:7125)
at android.view.View.performClickInternal(View.java:7102)

AddActivity.kt:

Code: Select all

class AddActivity : Fragment() {
private lateinit var img:ImageView
private lateinit var requestLauncher: ActivityResultLauncher

override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {

requestLauncher = registerForActivityResult(
ActivityResultContracts.RequestPermission()
) {
if(it){
showImageChooser(img)
}else{
Toast.makeText(requireContext(), "PERM", Toast.LENGTH_SHORT).show()
}
}
return inflater.inflate(R.layout.addpost, container, false)
}

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
val image1 = view.findViewById(R.id.addImage1)
val image2 = view.findViewById(R.id.addImage2)
val image3 = view.findViewById(R.id.addImage3)
val image4 = view.findViewById(R.id.addImage4)
val image5 = view.findViewById(R.id.addImage5)

image1.setOnClickListener {
requestPermission(image1)
}
image2.setOnClickListener {
requestPermission(image2)
}
image3.setOnClickListener {
requestPermission(image3)
}
image4.setOnClickListener {
requestPermission(image4)
}
image5.setOnClickListener {
requestPermission(image5)
}
val publishBtn = view.findViewById(R.id.addPublishBtn)

publishBtn.setOnClickListener { addItem(view) }

}

private fun requestPermission(imageView: ImageView) {
img = imageView

if (ContextCompat.checkSelfPermission(requireContext(), Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {

showImageChooser(imageView)
}
else{

ActivityCompat.requestPermissions(requireActivity(), arrayOf(Manifest.permission.READ_EXTERNAL_STORAGE), Constants.READ_STORAGE_PERMISSION_CODE)
requestLauncher.launch(Manifest.permission.READ_EXTERNAL_STORAGE)

}

}

fun showImageChooser(imageView: ImageView) {
val galleryIntent = Intent(
Intent.ACTION_PICK,
MediaStore.Images.Media.EXTERNAL_CONTENT_URI
)

val launchSomeActivity = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
if (result.resultCode == Activity.RESULT_OK) {
val data: Intent? = result.data
if (data != null){
try {
val mSelectedImageFileUri = data.data!!

//setUserPic.setImageURI(Uri.parse(selectedImageFileUri.toString()))
GlideLoader(requireContext()).loadUserPicture(mSelectedImageFileUri,imageView)

//FireStoreClass().uploadImgCloud(requireActivity(), mSelectedImageFileUri)

}catch (e:  IOException){
e.printStackTrace()
Toast.makeText(
requireContext(),
"Image selection failed",
Toast.LENGTH_SHORT
).show()
}
}
}
}

launchSomeActivity.launch(galleryIntent)
}

private fun addItem(view: View) {
//val image1 = view.findViewById(R.id.addImage1)
val addProductName = view.findViewById(R.id.addTitleEditText).text.toString()
val addProductDesc = view.findViewById(R.id.addDescEditText).text.toString()
val addProductPrice = view.findViewById(R.id.addPrice).text.toString()
val addProductCat = view.findViewById(R.id.selectCategoryEt).text.toString()

when{
TextUtils.isEmpty(addProductName.trim { it  Toast.makeText(activity,
"Please Enter Product Name.",
Toast.LENGTH_SHORT).show()

TextUtils.isEmpty(addProductDesc.trim { it  Toast.makeText(activity,
"Please Enter Product Description.",
Toast.LENGTH_SHORT).show()

TextUtils.isEmpty(addProductCat.trim { it  Toast.makeText(activity,
"Please Select Product Category.",
Toast.LENGTH_SHORT).show()

TextUtils.isEmpty(addProductPrice.trim { it  Toast.makeText(activity,
"Please Enter Product Price.",
Toast.LENGTH_SHORT).show()

else -> {
//val index = 0
val firebaseUser: String = Firebase.auth.currentUser!!.uid
val product = ProductItem(R.drawable.add_box,
addProductName,
0.0,
"Serhat Yilmaz",
addProductPrice.toInt(),
addProductDesc,
addProductCat.toInt(),
firebaseUser)

//Datasource.productList.add(index,product)
FireStoreClass().addProduct(requireActivity(), product)
//Toast.makeText(activity, "Product Published!", Toast.LENGTH_SHORT).show()
val action = AddActivityDirections.actionAddPostNavActivityToProductFragment()
view.findNavController().navigate(action)
}
}
}

}