fix #72, add Print functionality at fullscreen images

app/src/main/kotlin/com/simplemobiletools/gallery/pro/activities/ViewPagerActivity.kt

@@ -10,6 +10,7 @@ import android.content.pm.ShortcutInfo
 import android.content.pm.ShortcutManager
 import android.content.res.Configuration
 import android.database.Cursor
+import android.graphics.Bitmap
 import android.graphics.Color
 import android.graphics.drawable.ColorDrawable
 import android.graphics.drawable.Icon
@@ -24,7 +25,15 @@ import android.view.View
 import android.view.WindowManager
 import android.view.animation.DecelerateInterpolator
 import android.widget.Toast
+import androidx.print.PrintHelper
 import androidx.viewpager.widget.ViewPager
+import com.bumptech.glide.Glide
+import com.bumptech.glide.load.DataSource
+import com.bumptech.glide.load.engine.DiskCacheStrategy
+import com.bumptech.glide.load.engine.GlideException
+import com.bumptech.glide.request.RequestListener
+import com.bumptech.glide.request.RequestOptions
+import com.bumptech.glide.request.target.Target
 import com.simplemobiletools.commons.dialogs.PropertiesDialog
 import com.simplemobiletools.commons.dialogs.RenameItemDialog
 import com.simplemobiletools.commons.extensions.*
@@ -160,6 +169,7 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
             findItem(R.id.menu_copy_to).isVisible = visibleBottomActions and BOTTOM_ACTION_COPY == 0
             findItem(R.id.menu_move_to).isVisible = visibleBottomActions and BOTTOM_ACTION_MOVE == 0
             findItem(R.id.menu_save_as).isVisible = rotationDegrees != 0
+            findItem(R.id.menu_print).isVisible = currentMedium.isImage() || currentMedium.isRaw()
             findItem(R.id.menu_hide).isVisible = !currentMedium.isHidden() && visibleBottomActions and BOTTOM_ACTION_TOGGLE_VISIBILITY == 0 && !currentMedium.getIsInRecycleBin()
             findItem(R.id.menu_unhide).isVisible = currentMedium.isHidden() && visibleBottomActions and BOTTOM_ACTION_TOGGLE_VISIBILITY == 0 && !currentMedium.getIsInRecycleBin()
             findItem(R.id.menu_add_to_favorites).isVisible = !currentMedium.isFavorite && visibleBottomActions and BOTTOM_ACTION_TOGGLE_FAVORITE == 0 && !currentMedium.getIsInRecycleBin()
@@ -197,6 +207,7 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
             R.id.menu_share -> shareMediumPath(getCurrentPath())
             R.id.menu_delete -> checkDeleteConfirmation()
             R.id.menu_rename -> renameFile()
+            R.id.menu_print -> printFile()
             R.id.menu_edit -> openEditor(getCurrentPath())
             R.id.menu_properties -> showProperties()
             R.id.menu_show_on_map -> showOnMap()
@@ -874,6 +885,59 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
         }.start()
     }
 
+    private fun printFile() {
+        sendPrintIntent(getCurrentPath())
+    }
+
+    private fun sendPrintIntent(path: String) {
+        val printHelper = PrintHelper(this)
+        printHelper.scaleMode = PrintHelper.SCALE_MODE_FIT
+        printHelper.orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
+
+        try {
+            val resolution = path.getImageResolution()
+            if (resolution == null) {
+                toast(R.string.unknown_error_occurred)
+                return
+            }
+
+            var requestedWidth = resolution.x
+            var requestedHeight = resolution.y
+
+            if (requestedWidth >= MAX_PRINT_SIDE_SIZE) {
+                requestedHeight = (requestedHeight / (requestedWidth / MAX_PRINT_SIDE_SIZE.toFloat())).toInt()
+                requestedWidth = MAX_PRINT_SIDE_SIZE
+            } else if (requestedHeight >= MAX_PRINT_SIDE_SIZE) {
+                requestedWidth = (requestedWidth / (requestedHeight / MAX_PRINT_SIDE_SIZE.toFloat())).toInt()
+                requestedHeight = MAX_PRINT_SIDE_SIZE
+            }
+
+            val options = RequestOptions()
+                    .skipMemoryCache(true)
+                    .diskCacheStrategy(DiskCacheStrategy.NONE)
+
+            Glide.with(this)
+                    .asBitmap()
+                    .load(path)
+                    .apply(options)
+                    .listener(object : RequestListener<Bitmap> {
+                        override fun onLoadFailed(e: GlideException?, model: Any?, target: Target<Bitmap>?, isFirstResource: Boolean): Boolean {
+                            showErrorToast(e?.localizedMessage ?: "")
+                            return false
+                        }
+
+                        override fun onResourceReady(bitmap: Bitmap?, model: Any?, target: Target<Bitmap>?, dataSource: DataSource?, isFirstResource: Boolean): Boolean {
+                            if (bitmap != null) {
+                                printHelper.printBitmap(path.getFilenameFromPath(), bitmap)
+                            }
+
+                            return false
+                        }
+                    }).submit(requestedWidth, requestedHeight)
+        } catch (e: Exception) {
+        }
+    }
+
     private fun restoreFile() {
         restoreRecycleBinPath(getCurrentPath()) {
             refreshViewPager()

app/src/main/kotlin/com/simplemobiletools/gallery/pro/helpers/Constants.kt

@@ -115,6 +115,7 @@ const val DRAG_THRESHOLD = 8
 const val MONTH_MILLISECONDS = MONTH_SECONDS * 1000L
 const val MIN_SKIP_LENGTH = 2000
 const val HIDE_SYSTEM_UI_DELAY = 500L
+const val MAX_PRINT_SIDE_SIZE = 4096
 
 const val DIRECTORY = "directory"
 const val MEDIUM = "medium"

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

@@ -110,6 +110,10 @@
         android:icon="@drawable/ic_rename_new"
         android:title="@string/rename"
         app:showAsAction="ifRoom"/>
+    <item
+        android:id="@+id/menu_print"
+        android:title="@string/print"
+        app:showAsAction="never"/>
     <item
         android:id="@+id/menu_create_shortcut"
         android:title="@string/create_shortcut"