How to get imageBitmap from external storage using Activity Result API? - android

I am trying to get image file from external storage using new activity result Api.
My contract always return null from else branch (inside when). Why?
class GetImageContract : ActivityResultContract<Unit, Bitmap>() {
override fun createIntent(context: Context, input: Unit?): Intent {
val intent = Intent(ACTION_GET_CONTENT)
intent.type = "image/*"
return intent
}
override fun parseResult(resultCode: Int, intent: Intent?): Bitmap? {
return when {
resultCode != Activity.RESULT_OK -> null
else -> intent?.extras?.get("data") as? Bitmap
}
}
}

Related

registerForActivityResult and onActivityResult onActivityResult in Kotlin

I am currently trying to learn from a step-by-step tutorial to upload an Image or File to my server while using Volley. This tutorial is a little bit outdated and I really don't understand how I can fix these issues.
the tutorial
onActivityResult(Int, Int, Intent?): Unit' is deprecated. Deprecated in Java
Fragment is attempting to registerForActivityResult after being created. Fragments must call registerForActivityResult() before they are created (i.e. initialization, onAttach(), or onCreate()).
My code
//Uploading Photos
private fun launchGallery() {
val intent = Intent(Intent.ACTION_PICK)
intent.type = "image/*"
var resultLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
if (result.resultCode == Activity.RESULT_OK) {
// There are no request codes
val data: Intent? = result.data
}
}
}
private fun uploadImage() {
imageData?: return
val request = object : VolleyFileUploadRequest(
Request.Method.POST,
postURL,
{
println("response is: $it")
},
{
println("error is: $it")
}
) {
override fun getByteData(): MutableMap<String, FileDataPart> {
var params = HashMap<String, FileDataPart>()
params["imageFile"] = FileDataPart("image", imageData!!, "jpeg")
return params
}
}
Volley.newRequestQueue(requireContext()).add(request)
}
#Throws(IOException::class)
private fun createImageData(uri: Uri) {
val inputStream = requireContext().contentResolver.openInputStream(uri)
inputStream?.buffered()?.use {
imageData = it.readBytes()
}
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
if (resultCode == Activity.RESULT_OK && requestCode == IMAGE_PICK_CODE) {
val uri = data?.data
if (uri != null) {
imageView.setImageURI(uri)
createImageData(uri)
}
}
super.onActivityResult(requestCode, resultCode, data)
}
}
you are trying to registerForActivityResult from a method "launchGallery()" which is not the way it should be done, "registerForActivityResult" should be initialized in the Activity/Fragment onCreate function and then you can use the "resultLauncher" variable to open the gallery/camera etc...
also when you are using the "registerForActivityResult" you don't need to override "onActivityResult" (which is now deprecated).
check the Activity Result Api to get a better understanding of how the new api works.
and here is a good tutorial that shows you how to use the Android Activity Result API for selecting and taking images

Default way to get request code in ActivityResultContract

Is there any default way to get the request code in ActivityResultContract?
I know about StartActivityForResult contract, which returns ActivityResult, but there is no requestCode, only resultCode.
I can do something like this, but maybe there is a better solution:
class StartActivityForResult : ActivityResultContract<ActivityInput, ActivityOutput?>() {
override fun createIntent(
context: Context,
input: ActivityInput
): Intent {
return input.data.apply { putExtra(requestCodeKey, input.requestCode) }
}
override fun parseResult(resultCode: Int, intent: Intent?): ActivityOutput? {
return if (intent == null || resultCode != Activity.RESULT_OK) null
else ActivityOutput(
// should never return default value
requestCode = intent.getIntExtra(requestCodeKey, -1),
resultCode = resultCode,
data = intent
)
}
override fun getSynchronousResult(
context: Context,
input: ActivityInput?
): SynchronousResult<ActivityOutput?>? {
return if (input == null) SynchronousResult(null) else null
}
companion object {
const val requestCodeKey = "requestCodeKey";
}
}
data class ActivityInput(val requestCode: Int, val data: Intent)
data class ActivityOutput(val requestCode: Int,
val resultCode: Int,
val data: Intent
)

bitmap.sameAs() doesn't work on image comparison from Intent picking

My application checks whether the new selected image is the same as the previous one so that I don't need to update the cloud data, but newBitmap.sameAs(oldBitmap) always return false even though I pick the same photo.
Piece of my code:
private lateinit var oldBitmap: Bitmap
private lateinit var newBitmap: Bitmap
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_my_profile)
myProfilePictureUrl = intent.getStringExtra("myProfilePictureUrl")!!
if (myProfilePictureUrl.isNotEmpty()) {
Picasso.get().load(myProfilePictureUrl).into(my_profile_imageView)
}
oldBitmap = (my_profile_imageView.drawable as BitmapDrawable).bitmap //for later comparison
my_profile_imageView.setOnClickListener {
val intent = Intent(Intent.ACTION_PICK)
intent.type = "image/*"
startActivityForResult(intent, RESULT_CODE_PICK_IMAGE)
}
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (requestCode == RESULT_CODE_PICK_IMAGE && resultCode == Activity.RESULT_OK) {
val inputStream = contentResolver.openInputStream(data!!.data!!)
val bitmap = BitmapFactory.decodeStream(inputStream)
newBitmap = bitmap //for comparison
my_profile_imageView.setImageBitmap(bitmap)
}
}
And when the user click on the "save" button on the action bar will it first check whether they are the same photo:
private fun updateProfile(nickname: String) {
if (this::newBitmap.isInitialized && !newBitmap.sameAs(oldBitmap)) { //here
//upload task code
}
}
THE PROBLEM IS:
!newBitmap.sameAs(oldBitmap) always return false even they are the same photo, may be the problem of PICASSO? Or the way I used to compare is not right. Any help would be appreciated.

how to get gallery image path with an Intent

In my android application, I am trying to let the user select a gallery image and show a high-quality image in another activity. is there a way to get an absolute path from URI? or is there an efficient way to do this?
This function opens the gallery and lets the user select an image:
private fun getGalleryImage() {
val galleryImageIntent =
Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI)
if (galleryImageIntent.resolveActivity(requireActivity().packageManager) != null) {
startActivityForResult(galleryImageIntent, REQUEST_GALLERY_IMAGE)
}
}
And the following gets the result, but I am not sure how to get the image path
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
if (requestCode == REQUEST_GALLERY_IMAGE && resultCode == RESULT_OK) {
startActivity(
Intent(context, ImageViewActivity::class.java).putExtra(
"imagePath",
data?.data?.toString()
)
)
} else
super.onActivityResult(requestCode, resultCode, data)
}
Here is my ImageViewActivity:
class ImageViewActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_image_view)
backBtn.setOnClickListener {
finish()
}
val imagePath = intent?.extras?.get("imagePath")
BitmapFactory.decodeFile(imagePath?.toString())?.also { bitmap ->
imageHolder.setImageBitmap(bitmap)
}
}
}
I tried sending the bitmap itself to my ImageViewActivity but it keeps crashing, and from what I read online, it is not possible to send large amount of data to an Activity.

Using Kotlin to pass Image from ImageView to another Activity in Android

How to pass Image selected in ImageView to another Activity in Android using Kotlin ?
This is the way to select the Image inside the ImageView using internal Storage and I need to pass the image to another activity
fun Loadimage()
{
var intent = Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI)
startActivityForResult(intent,ImageCode)
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (requestCode==ImageCode && data!=null && resultCode== Activity.RESULT_OK)
{
val selectedImage = data.data
val filepath = arrayOf(MediaStore.Images.Media.DATA)
val cursor = contentResolver.query(selectedImage,filepath,null,null,null)
cursor.moveToFirst()
val Index = cursor.getColumnIndex(filepath[0])
val Picture = cursor.getString(Index)
cursor.close()
imageView.setImageBitmap(BitmapFactory.decodeFile(Picture))
}
}
You can pass Picture variable to next activity using Intents like below
val intent = Intent(this, NextActivity::class.java)
intent.putExtra("picture", Picture)
startActivity(intent)
Then in NextActivity, in onCreate method, you can get picture using
val Picture = getIntent().getStringExtra("picture")
In the NextActivity:
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val postImage = findViewById<ImageView>(R.id.post_image)
myPic = postImage
}
companion object {
lateinit var myPic: ImageView()
}
And in the first Activity:
NextActivity.myPic = Picture

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