Add the share icon in the eReceipt toolbar, which when tapped creates a screenshot of the eReceipt and sends an intent to the system so it shows all the possible options for the user to share the image.

app/src/main/java/cy/agorise/bitsybitshareswallet/fragments/EReceiptFragment.kt

@@ -1,12 +1,14 @@
 package cy.agorise.bitsybitshareswallet.fragments
 
+import android.Manifest
+import android.content.Intent
+import android.content.pm.PackageManager
 import android.os.Bundle
 import android.preference.PreferenceManager
 import android.text.Html
 import android.text.method.LinkMovementMethod
-import android.view.LayoutInflater
-import android.view.View
-import android.view.ViewGroup
+import android.view.*
+import androidx.core.content.ContextCompat
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.Observer
 import androidx.lifecycle.ViewModelProviders
@@ -15,6 +17,8 @@ import androidx.navigation.fragment.navArgs
 import cy.agorise.bitsybitshareswallet.R
 import cy.agorise.bitsybitshareswallet.database.joins.TransferDetail
 import cy.agorise.bitsybitshareswallet.utils.Constants
+import cy.agorise.bitsybitshareswallet.utils.Helper
+import cy.agorise.bitsybitshareswallet.utils.toast
 import cy.agorise.bitsybitshareswallet.viewmodels.EReceiptViewModel
 import kotlinx.android.synthetic.main.fragment_e_receipt.*
 import java.math.RoundingMode
@@ -25,6 +29,10 @@ import java.util.*
 
 class EReceiptFragment : Fragment() {
 
+    companion object {
+        private const val REQUEST_WRITE_EXTERNAL_STORAGE_PERMISSION = 100
+    }
+
     private val args: EReceiptFragmentArgs by navArgs()
 
     private lateinit var mEReceiptViewModel: EReceiptViewModel
@@ -97,4 +105,66 @@ class EReceiptFragment : Fragment() {
         tvTransferID.text = tx
         tvTransferID.movementMethod = LinkMovementMethod.getInstance()
     }
+
+    override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
+        inflater.inflate(R.menu.menu_e_receipt, menu)
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem?): Boolean {
+        if (item?.itemId == R.id.menu_share) {
+            verifyStoragePermission()
+            return true
+        }
+        return super.onOptionsItemSelected(item)
+    }
+
+    /** Verifies if the storage permission is already granted, if that is the case then it takes the screenshot and
+     * shares it but if it is not then it asks the user for that permission */
+    private fun verifyStoragePermission() {
+        if (ContextCompat.checkSelfPermission(activity!!, Manifest.permission.WRITE_EXTERNAL_STORAGE)
+            != PackageManager.PERMISSION_GRANTED) {
+            // Permission is not already granted
+            requestPermissions(arrayOf(android.Manifest.permission.WRITE_EXTERNAL_STORAGE),
+                REQUEST_WRITE_EXTERNAL_STORAGE_PERMISSION)
+        } else {
+            // Permission is already granted
+            shareEReceiptScreenshot()
+        }
+    }
+
+    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
+
+        if (requestCode == REQUEST_WRITE_EXTERNAL_STORAGE_PERMISSION) {
+            if ((grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED)) {
+                shareEReceiptScreenshot()
+            } else {
+                context?.toast(getString(R.string.msg__storage_permission_necessary_share))
+            }
+            return
+        }
+    }
+
+    /** Takes a screenshot as a bitmap (hiding the tx hyperlink), saves it into a temporal cache image and then
+     * sends an intent so the user can select the desired method to share the image. */
+    private fun shareEReceiptScreenshot() {
+        // Get Screenshot
+        tvTransferID.text = getString(R.string.template__tx, args.transferId)
+        val screenshot = Helper.loadBitmapFromView(container)
+        formatTransferTextView(args.transferId)
+        val imageUri = context?.let { Helper.saveTemporalBitmap(it, screenshot) }
+
+        // Prepare information for share intent
+        val subject = "${getString(R.string.app_name)} ${getString(R.string.title_e_receipt)}"
+
+        // Create share intent and call it
+        val shareIntent = Intent()
+        shareIntent.action = Intent.ACTION_SEND
+        shareIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION) // temp permission for receiving app to read this file
+        shareIntent.putExtra(Intent.EXTRA_STREAM, imageUri)
+        shareIntent.putExtra(Intent.EXTRA_SUBJECT, subject)
+        shareIntent.putExtra(Intent.EXTRA_TEXT, subject)
+        shareIntent.type = "*/*"
+        startActivity(Intent.createChooser(shareIntent, getString(R.string.text__share_with)))
+    }
 }

app/src/main/res/menu/menu_e_receipt.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <item android:id="@+id/menu_share"
+          android:icon="@drawable/ic_share"
+          android:title="@string/title_share"
+          app:showAsAction="always"/>
+
+</menu>