Fix QR code sharing

src/org/thoughtcrime/securesms/loki/redesign/activities/QRCodeActivity.kt

@@ -1,5 +1,6 @@
 package org.thoughtcrime.securesms.loki.redesign.activities
 
+import android.Manifest
 import android.content.Intent
 import android.graphics.Bitmap
 import android.graphics.Typeface
@@ -14,6 +15,7 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.widget.Toast
+import com.tbruyelle.rxpermissions2.RxPermissions
 import kotlinx.android.synthetic.main.activity_qr_code.*
 import kotlinx.android.synthetic.main.fragment_view_my_qr_code.*
 import network.loki.messenger.R
@@ -129,6 +131,7 @@ class ViewMyQRCodeFragment : Fragment() {
     }
 
     private fun shareQRCode() {
+        fun proceed() {
             val directory = File(Environment.getExternalStorageDirectory(), Environment.DIRECTORY_PICTURES)
             val fileName = "$hexEncodedPublicKey.png"
             val file = File(directory, fileName)
@@ -145,5 +148,16 @@ class ViewMyQRCodeFragment : Fragment() {
             intent.type = "image/png"
             startActivity(Intent.createChooser(intent, "Share QR Code"))
         }
+        if (RxPermissions(this).isGranted(Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
+            proceed()
+        } else {
+            @SuppressWarnings("unused")
+            val unused = RxPermissions(this).request(Manifest.permission.WRITE_EXTERNAL_STORAGE).subscribe { isGranted ->
+                if (isGranted) {
+                    proceed()
+                }
+            }
+        }
+    }
 }
 // endregion