use subsamplingScaleImageView for fullscreen images again

app/build.gradle

@@ -33,6 +33,7 @@ android {
 
 dependencies {
     compile 'com.simplemobiletools:commons:2.14.7'
+    compile 'com.davemorrissey.labs:subsampling-scale-image-view:3.6.0'
     compile 'com.theartofdev.edmodo:android-image-cropper:2.3.1'
     compile 'com.bignerdranch.android:recyclerview-multiselect:0.2'
     compile 'com.google.code.gson:gson:2.8.0'

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

@@ -3,6 +3,7 @@ package com.simplemobiletools.gallery.activities
 import android.app.Activity
 import android.content.Intent
 import android.content.pm.ActivityInfo
+import android.content.res.Configuration
 import android.database.Cursor
 import android.graphics.Bitmap
 import android.graphics.BitmapFactory
@@ -13,6 +14,7 @@ import android.os.Build
 import android.os.Bundle
 import android.provider.MediaStore
 import android.support.v4.view.ViewPager
+import android.util.DisplayMetrics
 import android.view.Menu
 import android.view.MenuItem
 import android.view.View
@@ -50,6 +52,11 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
     private var mShowAll = false
     private var mRotationDegrees = 0f
 
+    companion object {
+        var screenWidth = 0
+        var screenHeight = 0
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_medium)
@@ -59,6 +66,7 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
             return
         }
 
+        measureScreen()
         val uri = intent.data
         if (uri != null) {
             var cursor: Cursor? = null
@@ -344,6 +352,18 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
         }
     }
 
+    override fun onConfigurationChanged(newConfig: Configuration?) {
+        super.onConfigurationChanged(newConfig)
+        measureScreen()
+    }
+
+    private fun measureScreen() {
+        val metrics = DisplayMetrics()
+        windowManager.defaultDisplay.getMetrics(metrics)
+        screenWidth = metrics.widthPixels
+        screenHeight = metrics.heightPixels
+    }
+
     private fun reloadViewPager() {
         mCurrAsyncTask = GetMediaAsynctask(applicationContext, mDirectory, false, false, mShowAll) {
             mMedia = it

app/src/main/kotlin/com/simplemobiletools/gallery/extensions/activity.kt

@@ -138,7 +138,7 @@ fun Activity.hasNavBar(): Boolean {
 
 fun SimpleActivity.launchAbout() {
     startAboutActivity(R.string.app_name, LICENSE_KOTLIN or LICENSE_GLIDE or LICENSE_CROPPER or LICENSE_MULTISELECT or LICENSE_RTL
-            or LICENSE_PHOTOVIEW, BuildConfig.VERSION_NAME)
+            or LICENSE_PHOTOVIEW or LICENSE_SUBSAMPLING, BuildConfig.VERSION_NAME)
 }
 
 fun AppCompatActivity.showSystemUI() {

app/src/main/kotlin/com/simplemobiletools/gallery/fragments/PhotoFragment.kt

@@ -13,8 +13,15 @@ import com.bumptech.glide.Glide
 import com.bumptech.glide.Priority
 import com.bumptech.glide.load.DecodeFormat
 import com.bumptech.glide.load.engine.DiskCacheStrategy
+import com.bumptech.glide.request.RequestListener
+import com.bumptech.glide.request.target.Target
+import com.davemorrissey.labs.subscaleview.ImageSource
+import com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView
+import com.simplemobiletools.commons.extensions.beGone
+import com.simplemobiletools.commons.extensions.beVisible
 import com.simplemobiletools.commons.extensions.toast
 import com.simplemobiletools.gallery.R
+import com.simplemobiletools.gallery.activities.ViewPagerActivity
 import com.simplemobiletools.gallery.extensions.getRealPathFromURI
 import com.simplemobiletools.gallery.helpers.GlideRotateTransformation
 import com.simplemobiletools.gallery.helpers.MEDIUM
@@ -72,6 +79,7 @@ class PhotoFragment : ViewPagerFragment() {
             }
         }
 
+        view.subsampling_view.apply { setOnClickListener({ photoClicked() }) }
         view.photo_view.apply {
             maximumScale = 8f
             mediumScale = 3f
@@ -140,9 +148,18 @@ class PhotoFragment : ViewPagerFragment() {
                     .load(medium.path)
                     .asBitmap()
                     .format(DecodeFormat.PREFER_ARGB_8888)
-                    .thumbnail(0.1f)
                     .diskCacheStrategy(DiskCacheStrategy.NONE)
-                    .into(view.photo_view)
+                    .override(ViewPagerActivity.screenWidth, ViewPagerActivity.screenHeight)
+                    .listener(object : RequestListener<String, Bitmap> {
+                        override fun onException(e: java.lang.Exception?, model: String?, target: Target<Bitmap>?, isFirstResource: Boolean): Boolean {
+                            return false
+                        }
+
+                        override fun onResourceReady(resource: Bitmap?, model: String?, target: Target<Bitmap>?, isFromMemoryCache: Boolean, isFirstResource: Boolean): Boolean {
+                            addZoomableView()
+                            return false
+                        }
+                    }).into(view.photo_view)
         } else {
             Glide.with(this)
                     .load(medium.path)
@@ -155,6 +172,39 @@ class PhotoFragment : ViewPagerFragment() {
         }
     }
 
+    private fun addZoomableView() {
+        if (!medium.isPng()) {
+            view.subsampling_view.apply {
+                beVisible()
+                setDoubleTapZoomScale(1.4f)
+                setImage(ImageSource.uri(medium.path))
+                orientation = SubsamplingScaleImageView.ORIENTATION_USE_EXIF
+                setOnImageEventListener(object : SubsamplingScaleImageView.OnImageEventListener {
+                    override fun onImageLoaded() {
+                    }
+
+                    override fun onReady() {
+                        view.photo_view.beGone()
+                        view.photo_view.setImageBitmap(null)
+                    }
+
+                    override fun onTileLoadError(p0: Exception?) {
+                    }
+
+                    override fun onPreviewReleased() {
+                    }
+
+                    override fun onImageLoadError(p0: Exception?) {
+                        beGone()
+                    }
+
+                    override fun onPreviewLoadError(p0: Exception?) {
+                    }
+                })
+            }
+        }
+    }
+
     fun rotateImageViewBy(degrees: Float) {
         loadBitmap(degrees)
     }

app/src/main/kotlin/com/simplemobiletools/gallery/models/Medium.kt

@@ -2,6 +2,7 @@ package com.simplemobiletools.gallery.models
 
 import com.simplemobiletools.commons.extensions.getMimeType
 import com.simplemobiletools.commons.extensions.isGif
+import com.simplemobiletools.commons.extensions.isPng
 import com.simplemobiletools.commons.helpers.SORT_BY_DATE_MODIFIED
 import com.simplemobiletools.commons.helpers.SORT_BY_NAME
 import com.simplemobiletools.commons.helpers.SORT_BY_SIZE
@@ -15,6 +16,8 @@ data class Medium(val name: String, var path: String, val isVideo: Boolean, val
         var sorting: Int = 0
     }
 
+    fun isPng() = path.isPng()
+
     fun isGif() = path.isGif()
 
     fun isImage() = !isGif() && !isVideo

app/src/main/res/layout/pager_photo_item.xml

@@ -9,4 +9,11 @@
         android:id="@+id/photo_view"
         android:layout_width="match_parent"
         android:layout_height="match_parent"/>
+
+    <com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView
+        android:id="@+id/subsampling_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:visibility="gone"/>
+
 </RelativeLayout>