Implement save image to gallery

app/src/main/AndroidManifest.xml

@@ -6,6 +6,7 @@
     <uses-permission android:name="android.permission.WAKE_LOCK" />
     <uses-permission android:name="android.permission.VIBRATE" />
     <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 
     <permission
         android:name="${applicationId}.permission.C2D_MESSAGE"

app/src/main/java/chat/rocket/android/chatroom/adapter/ImageAttachmentViewHolder.kt

 package chat.rocket.android.chatroom.adapter
 
+import android.graphics.Color
+import android.media.MediaScannerConnection
+import android.net.Uri
+import android.os.Environment
+import android.support.v7.widget.Toolbar
 import android.view.View
+import android.widget.Toast
+import chat.rocket.android.R
 import chat.rocket.android.chatroom.viewmodel.ImageAttachmentViewModel
-import com.facebook.drawee.backends.pipeline.Fresco
-import com.facebook.drawee.interfaces.DraweeController
 import chat.rocket.android.widget.emoji.EmojiReactionListener
+import com.facebook.binaryresource.FileBinaryResource
+import com.facebook.cache.common.CacheKey
+import com.facebook.drawee.backends.pipeline.Fresco
+import com.facebook.imageformat.ImageFormatChecker
+import com.facebook.imagepipeline.cache.DefaultCacheKeyFactory
+import com.facebook.imagepipeline.core.ImagePipelineFactory
+import com.facebook.imagepipeline.request.ImageRequest
+import com.facebook.imagepipeline.request.ImageRequestBuilder
 import com.stfalcon.frescoimageviewer.ImageViewer
 import kotlinx.android.synthetic.main.message_attachment.view.*
+import timber.log.Timber
+import java.io.File
+
 
 class ImageAttachmentViewHolder(itemView: View,
                                 listener: ActionsListener,
                                 reactionListener: EmojiReactionListener? = null)
     : BaseViewHolder<ImageAttachmentViewModel>(itemView, listener, reactionListener) {
 
+    private var cacheKey: CacheKey? = null
+
     init {
         with(itemView) {
             setupActionMenu(attachment_container)
@@ -31,9 +49,30 @@ class ImageAttachmentViewHolder(itemView: View,
             file_name.text = data.attachmentTitle
             image_attachment.setOnClickListener { view ->
                 // TODO - implement a proper image viewer with a proper Transition
+
+
+                val request = ImageRequestBuilder.newBuilderWithSource(Uri.parse(data.attachmentUrl))
+                    .setLowestPermittedRequestLevel(ImageRequest.RequestLevel.DISK_CACHE)
+                    .build()
+                cacheKey = DefaultCacheKeyFactory.getInstance()
+                    .getEncodedCacheKey(request, null)
+
+                val toolbar = Toolbar(itemView.context).also {
+                    it.inflateMenu(R.menu.image_actions)
+                    it.overflowIcon?.setTint(Color.WHITE)
+                    it.setOnMenuItemClickListener {
+                        return@setOnMenuItemClickListener when (it.itemId) {
+                            R.id.action_save_image -> saveImage()
+                            else -> super.onMenuItemClick(it)
+                        }
+                    }
+                }
+
                 val builder = ImageViewer.createPipelineDraweeControllerBuilder()
+                    .setImageRequest(request)
                     .setAutoPlayAnimations(true)
                 ImageViewer.Builder(view.context, listOf(data.attachmentUrl))
+                    .setOverlayView(toolbar)
                     .setStartPosition(0)
                     .hideStatusBar(false)
                     .setCustomDraweeControllerBuilder(builder)
@@ -42,4 +81,32 @@ class ImageAttachmentViewHolder(itemView: View,
         }
     }
 
+    private fun saveImage(): Boolean {
+        if (ImagePipelineFactory.getInstance().mainFileCache.hasKey(cacheKey)) {
+            val context = itemView.context
+            val resource = ImagePipelineFactory.getInstance().mainFileCache.getResource(cacheKey)
+            val cachedFile = (resource as FileBinaryResource).file
+            val imageFormat = ImageFormatChecker.getImageFormat(resource.openStream())
+            val imageDir = "${Environment.DIRECTORY_PICTURES}/Rocket.Chat Images/"
+            val imagePath = Environment.getExternalStoragePublicDirectory(imageDir)
+            val imageFile = File(imagePath, "${cachedFile.nameWithoutExtension}.${imageFormat.fileExtension}")
+            imagePath.mkdirs()
+            imageFile.createNewFile()
+            try {
+                cachedFile.copyTo(imageFile, true)
+                MediaScannerConnection.scanFile(context, arrayOf(imageFile.absolutePath), null) { path, uri ->
+                    Timber.i("Scanned $path:")
+                    Timber.i("-> uri=$uri")
+                }
+            } catch (ex: Exception) {
+                Timber.e(ex)
+                val message = context.getString(R.string.msg_image_saved_failed)
+                Toast.makeText(context, message, Toast.LENGTH_SHORT).show()
+            } finally {
+                val message = context.getString(R.string.msg_image_saved_successfully)
+                Toast.makeText(context, message, Toast.LENGTH_SHORT).show()
+            }
+        }
+        return true
+    }
 }
\ No newline at end of file

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

+<?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/action_save_image"
+        android:title="Save to Gallery"
+        app:showAsAction="never" />
+</menu>
\ No newline at end of file

app/src/main/res/values-es/strings.xml

@@ -93,6 +93,8 @@
     <string name="msg_http_insecure">When using HTTP, you\'re connecting to an insecure server. We don\'t recommend you doing that.</string>
     <string name="msg_error_checking_server_version">An error has occurred while checking your server version, please try again</string>
     <string name="msg_invalid_server_protocol">The selected protocol is not accepted by this server, try using HTTPS</string>
+    <string name="msg_image_saved_successfully">La imagen se ha guardado en la galería</string>
+    <string name="msg_image_saved_failed">Error al guardar la imagen</string>
 
     <!-- System messages -->
     <string name="message_room_name_changed">Room name changed to: %1$s by %2$s</string>

app/src/main/res/values-fr/strings.xml

@@ -93,6 +93,8 @@
     <string name="msg_http_insecure">When using HTTP, you\'re connecting to an insecure server. We don\'t recommend you doing that.</string>
     <string name="msg_error_checking_server_version">An error has occurred while checking your server version, please try again</string>
     <string name="msg_invalid_server_protocol">The selected protocol is not accepted by this server, try using HTTPS</string>
+    <string name="msg_image_saved_successfully">L\'image a été enregistrée dans la galerie</string>
+    <string name="msg_image_saved_failed">Échec de l\'enregistrement de l\'image</string>
 
     <!-- System messages -->
     <string name="message_room_name_changed">Room name changed to: %1$s by %2$s</string>

app/src/main/res/values-hi-rIN/strings.xml

@@ -95,6 +95,8 @@
     <string name="msg_http_insecure">HTTP का उपयोग करते समय, आप एक असुरक्षित सर्वर से कनेक्ट हो रहे हैं। हम आपको ऐसा करने की सलाह नहीं देते हैं।</string>
     <string name="msg_error_checking_server_version">आपके सर्वर संस्करण की जांच करते समय एक त्रुटि आई है, कृपया पुनः प्रयास करें</string>
     <string name="msg_invalid_server_protocol">चयनित प्रोटोकॉल इस सर्वर द्वारा स्वीकार नहीं किया गया है, HTTPS का उपयोग करने का प्रयास करें</string>
+    <string name="msg_image_saved_successfully">छवि गैलरी में सहेजा गया है</string>
+    <string name="msg_image_saved_failed">छवि को सहेजने में विफल</string>
 
     <!-- System messages -->
     <string name="message_room_name_changed">%2$s ने रूम का नाम बदलकर %1$s किया</string>

app/src/main/res/values-pt-rBR/strings.xml

@@ -95,6 +95,8 @@
     <string name="msg_http_insecure">Usando HTTP, você estará conectando a um servidor não seguro, não recomendamos sua utilização.</string>
     <string name="msg_error_checking_server_version">Ocorreu um erro verificando a versão do servidor, por favor tente novamente</string>
     <string name="msg_invalid_server_protocol">O protocolo selecionado não é suportado pelo servidor, por favor utilize HTTPS e tente novamente</string>
+    <string name="msg_image_saved_successfully">Imagem salva na galeria</string>
+    <string name="msg_image_saved_failed">Falha ao salvar a imagem</string>
     
     <!-- System messages -->
     <string name="message_room_name_changed">Nome da sala alterado para: %1$s por %2$s</string>

app/src/main/res/values/strings.xml

@@ -96,6 +96,8 @@
     <string name="msg_http_insecure">When using HTTP, you\'re connecting to an insecure server. We don\'t recommend you doing that.</string>
     <string name="msg_error_checking_server_version">An error has occurred while checking your server version, please try again</string>
     <string name="msg_invalid_server_protocol">The selected protocol is not accepted by this server, try using HTTPS</string>
+    <string name="msg_image_saved_successfully">Image has been saved to gallery</string>
+    <string name="msg_image_saved_failed">Failed to save image</string>
 
     <!-- System messages -->
     <string name="message_room_name_changed">Room name changed to: %1$s by %2$s</string>