Transfer image to other activity in kotlin

问题

I am making an application like instagram which will allow the user to upload their pic and if they need any editing then they can press editing button and they can edit. How can I transfer the same photo which the user chose to the editing activity in kotlin? And also after editing how can I covert the whole ConstraintLayout to image and transfer it back to the upload activity.

回答1:

You can save the image to internal storage from activity one, then send the image name to the second activity (via Intent) and open it in second activity.

Save the image to internal storage:

saveToInternalStorage(context, <your_bitmap>, <image_name>)
Start activity like in this link and instead of message put <image_name>
On opened activity, get your <image_name>
Open the image from internal storage:

val bitmap = getImageFromInternalStorage(context, <image_name>)

Here is my storage helper class:

class ImageStorageManager {
    companion object {
        fun saveToInternalStorage(context: Context, bitmapImage: Bitmap, imageFileName: String): String {
            context.openFileOutput(imageFileName, Context.MODE_PRIVATE).use { fos ->
                bitmapImage.compress(Bitmap.CompressFormat.PNG, 50, fos)
            }
            return context.filesDir.absolutePath
        }

        fun getImageFromInternalStorage(context: Context, imageFileName: String): Bitmap? {
            val directory = context.filesDir
            val file = File(directory, imageFileName)
            return if (file.exists()) {
                BitmapFactory.decodeStream(FileInputStream(file))
            } else {
                null
            }
        }

        fun deleteImageFromInternalStorage(context: Context, imageFileName: String): Boolean {
            val dir = context.filesDir
            val file = File(dir, imageFileName)
            return file.delete()
        }
    }
}

来源：https://stackoverflow.com/questions/62671532/transfer-image-to-other-activity-in-kotlin

标签

android-studio

kotlin