Expand images on tap (#315)

* Detect click on images in WebView

* First stub of the fragment to show the image in full screen

* Scale image dimension to fit the display

* Hide toolbar from Image view

* Add back button to the Image view

* Open one image on tap

* Allow zooming on images

* Revert to using Toolbar for navigation.

* Remove vibration when opening the Image view

* Do not open links associated with images

* Send all images in the webpage to the Image fragment.

* Change image on swipe

* Store article images in cache in background.

* Use PhotoView in place of WebView to display images. Implemented a pager to swipe through images.

* Removed debugging logging.

app/build.gradle

@@ -138,6 +138,9 @@ dependencies {
     // Pager
     implementation 'me.relex:circleindicator:2.0.0@aar'
 
+    //PhotoView
+    implementation 'com.github.chrisbanes:PhotoView:2.0.0'
+
     implementation 'androidx.core:core-ktx:1.1.0-beta01'
 
     implementation "androidx.lifecycle:lifecycle-livedata:$lifecycle_version"

app/src/main/AndroidManifest.xml

@@ -62,6 +62,9 @@
         <activity
             android:name=".ReaderActivity">
         </activity>
+        <activity
+            android:name=".ImageActivity">
+        </activity>
 
         <meta-data
             android:name="apps.amine.bou.readerforselfoss.utils.glide.SelfSignedGlideModule"

app/src/main/java/apps/amine/bou/readerforselfoss/ImageActivity.kt

@@ -0,0 +1,52 @@
+package apps.amine.bou.readerforselfoss
+
+import android.os.Bundle
+import android.view.MenuItem
+import androidx.appcompat.app.AppCompatActivity
+import androidx.fragment.app.FragmentManager
+import androidx.fragment.app.FragmentStatePagerAdapter
+import apps.amine.bou.readerforselfoss.fragments.ImageFragment
+import kotlinx.android.synthetic.main.activity_reader.*
+
+class ImageActivity : AppCompatActivity() {
+    private lateinit var allImages : ArrayList<String>
+    private var position : Int = 0
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        setContentView(R.layout.activity_image)
+
+        setSupportActionBar(toolBar)
+        supportActionBar?.setDisplayShowTitleEnabled(false)
+        supportActionBar?.setDisplayHomeAsUpEnabled(true)
+
+        allImages = intent.getStringArrayListExtra("allImages")
+        position = intent.getIntExtra("position", 0)
+
+        pager.adapter = ScreenSlidePagerAdapter(supportFragmentManager)
+        pager.currentItem = position
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        when (item.itemId) {
+            android.R.id.home -> {
+                onBackPressed()
+                return true
+            }
+        }
+
+        return super.onOptionsItemSelected(item)
+    }
+
+    private inner class ScreenSlidePagerAdapter(fm: FragmentManager) : FragmentStatePagerAdapter(fm, FragmentStatePagerAdapter.BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT) {
+
+        override fun getCount(): Int {
+            return allImages.size
+        }
+
+        override fun getItem(position: Int): ImageFragment {
+            return ImageFragment.newInstance(allImages[position])
+        }
+    }
+}

app/src/main/java/apps/amine/bou/readerforselfoss/api/selfoss/SelfossModels.kt

@@ -5,9 +5,14 @@ import android.net.Uri
 import android.os.Parcel
 import android.os.Parcelable
 import android.text.Html
+import android.webkit.URLUtil
+import org.jsoup.Jsoup
 
 import apps.amine.bou.readerforselfoss.utils.Config
 import apps.amine.bou.readerforselfoss.utils.isEmptyOrNullOrNullString
+import com.bumptech.glide.Glide
+import com.bumptech.glide.load.engine.DiskCacheStrategy
+import com.bumptech.glide.request.RequestOptions
 import com.google.gson.annotations.SerializedName
 
 private fun constructUrl(config: Config?, path: String, file: String?): String {
@@ -128,6 +133,36 @@ data class Item(
         return constructUrl(config, "thumbnails", thumbnail)
     }
 
+    fun getImages() : ArrayList<String> {
+        var allImages = ArrayList<String>()
+
+        for ( image in Jsoup.parse(content).getElementsByTag("img")) {
+            allImages.add(image.attr("src"))
+        }
+        return allImages
+    }
+
+    fun preloadImages(context: Context) : Boolean {
+        val imageUrls = this.getImages()
+
+        val glideOptions = RequestOptions.diskCacheStrategyOf(DiskCacheStrategy.ALL)
+
+
+        try {
+            for (url in imageUrls) {
+                if ( URLUtil.isValidUrl(url)) {
+                    val image = Glide.with(context).asBitmap()
+                            .apply(glideOptions)
+                            .load(url).submit().get()
+                }
+            }
+        } catch (e : Error) {
+            return false
+        }
+
+        return true
+    }
+
     fun getTitleDecoded(): String {
         return Html.fromHtml(title).toString()
     }

app/src/main/java/apps/amine/bou/readerforselfoss/background/background.kt

@@ -105,6 +105,7 @@ class LoadingWorker(val context: Context, params: WorkerParameters) : Worker(con
                                     notificationManager.notify(2, newItemsNotification.build())
                                 }
                             }
+                            apiItems.map {it.preloadImages(context)}
                         }
                         Timer("", false).schedule(4000) {
                             notificationManager.cancel(1)

app/src/main/java/apps/amine/bou/readerforselfoss/fragments/ArticleFragment.kt

@@ -1,28 +1,28 @@
 package apps.amine.bou.readerforselfoss.fragments
 
 import android.content.Context
+import android.content.Intent
 import android.content.SharedPreferences
 import android.content.res.ColorStateList
 import android.content.res.TypedArray
+import android.graphics.Bitmap
 import android.graphics.Typeface
 import android.graphics.drawable.ColorDrawable
+import android.net.Uri
 import android.os.Build
 import android.os.Bundle
 import android.preference.PreferenceManager
-import android.view.InflateException
+import android.view.*
+import android.webkit.*
 import androidx.browser.customtabs.CustomTabsIntent
 import com.google.android.material.floatingactionbutton.FloatingActionButton
 import androidx.fragment.app.Fragment
 import androidx.core.content.ContextCompat
 import androidx.core.widget.NestedScrollView
-import android.view.LayoutInflater
-import android.view.MenuItem
-import android.view.View
-import android.view.ViewGroup
-import android.webkit.WebSettings
 import androidx.appcompat.app.AlertDialog
 import androidx.core.content.res.ResourcesCompat
 import androidx.room.Room
+import apps.amine.bou.readerforselfoss.ImageActivity
 import apps.amine.bou.readerforselfoss.R
 import apps.amine.bou.readerforselfoss.api.mercury.MercuryApi
 import apps.amine.bou.readerforselfoss.api.mercury.ParsedContent
@@ -39,6 +39,7 @@ import apps.amine.bou.readerforselfoss.utils.Config
 import apps.amine.bou.readerforselfoss.utils.buildCustomTabsIntent
 import apps.amine.bou.readerforselfoss.utils.customtabs.CustomTabActivityHelper
 import apps.amine.bou.readerforselfoss.utils.glide.loadMaybeBasicAuth
+import apps.amine.bou.readerforselfoss.utils.glide.getBitmapInputStream
 import apps.amine.bou.readerforselfoss.utils.isEmptyOrNullOrNullString
 import apps.amine.bou.readerforselfoss.utils.network.isNetworkAccessible
 import apps.amine.bou.readerforselfoss.utils.openItemUrl
@@ -46,6 +47,7 @@ import apps.amine.bou.readerforselfoss.utils.shareLink
 import apps.amine.bou.readerforselfoss.utils.sourceAndDateText
 import apps.amine.bou.readerforselfoss.utils.succeeded
 import com.bumptech.glide.Glide
+import com.bumptech.glide.load.engine.DiskCacheStrategy
 import com.bumptech.glide.request.RequestOptions
 import com.github.rubensousa.floatingtoolbar.FloatingToolbar
 import kotlinx.android.synthetic.main.fragment_article.view.*
@@ -54,6 +56,8 @@ import retrofit2.Callback
 import retrofit2.Response
 import java.net.MalformedURLException
 import java.net.URL
+import java.util.concurrent.ExecutionException
+import kotlin.collections.ArrayList
 import kotlin.concurrent.thread
 
 class ArticleFragment : Fragment() {
@@ -66,6 +70,7 @@ class ArticleFragment : Fragment() {
     private lateinit var contentSource: String
     private lateinit var contentImage: String
     private lateinit var contentTitle: String
+    private lateinit var allImages : ArrayList<String>
     private lateinit var editor: SharedPreferences.Editor
     private lateinit var fab: FloatingActionButton
     private lateinit var appColors: AppColors
@@ -117,6 +122,7 @@ class ArticleFragment : Fragment() {
             contentTitle = allItems[pageNumber.toInt()].getTitleDecoded()
             contentImage = allItems[pageNumber.toInt()].getThumbnail(activity!!)
             contentSource = allItems[pageNumber.toInt()].sourceAndDateText()
+            allImages = allItems[pageNumber.toInt()].getImages()
 
             prefs = PreferenceManager.getDefaultSharedPreferences(activity)
             editor = prefs.edit()
@@ -411,6 +417,47 @@ class ArticleFragment : Fragment() {
         rootView!!.webcontent.settings.loadWithOverviewMode = true
         rootView!!.webcontent.settings.javaScriptEnabled = false
 
+        rootView!!.webcontent.webViewClient = object : WebViewClient() {
+            override fun shouldOverrideUrlLoading(view: WebView?, url : String): Boolean {
+                if (rootView!!.webcontent.hitTestResult.type != WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE) {
+                    rootView!!.context.startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(url)))
+                }
+                return true
+            }
+
+            override fun shouldInterceptRequest(view: WebView?, url: String): WebResourceResponse? {
+                val glideOptions = RequestOptions.diskCacheStrategyOf(DiskCacheStrategy.ALL)
+                if (url.toLowerCase().contains(".jpg") || url.toLowerCase().contains(".jpeg")) {
+                    try {
+                        val image = Glide.with(view).asBitmap().apply(glideOptions).load(url).submit().get()
+                        return WebResourceResponse("image/jpg", "UTF-8", getBitmapInputStream(image, Bitmap.CompressFormat.JPEG))
+                    }catch ( e : ExecutionException) {}
+                }
+                else if (url.toLowerCase().contains(".png")) {
+                    try {
+                        val image = Glide.with(view).asBitmap().apply(glideOptions).load(url).submit().get()
+                        return WebResourceResponse("image/jpg", "UTF-8", getBitmapInputStream(image, Bitmap.CompressFormat.PNG))
+                    }catch ( e : ExecutionException) {}
+                }
+                else if (url.toLowerCase().contains(".webp")) {
+                    try {
+                        val image = Glide.with(view).asBitmap().apply(glideOptions).load(url).submit().get()
+                        return WebResourceResponse("image/jpg", "UTF-8", getBitmapInputStream(image, Bitmap.CompressFormat.WEBP))
+                    }catch ( e : ExecutionException) {}
+                }
+
+                return super.shouldInterceptRequest(view, url)
+            }
+        }
+
+        val gestureDetector = GestureDetector(activity, object : GestureDetector.SimpleOnGestureListener() {
+            override fun onSingleTapUp(e: MotionEvent?): Boolean {
+                return performClick()
+            }
+        })
+
+        rootView!!.webcontent.setOnTouchListener { _, event -> gestureDetector.onTouchEvent(event)}
+
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
             rootView!!.webcontent.settings.layoutAlgorithm =
                     WebSettings.LayoutAlgorithm.TEXT_AUTOSIZING
@@ -526,5 +573,20 @@ class ArticleFragment : Fragment() {
         }
     }
 
+    fun performClick(): Boolean {
+        if (rootView!!.webcontent.hitTestResult.type == WebView.HitTestResult.IMAGE_TYPE ||
+                rootView!!.webcontent.hitTestResult.type == WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE) {
+
+            val position : Int = allImages.indexOf(rootView!!.webcontent.hitTestResult.extra)
+
+            val intent = Intent(activity, ImageActivity::class.java)
+            intent.putExtra("allImages", allImages)
+            intent.putExtra("position", position)
+            startActivity(intent)
+            return false
+        }
+        return false
+    }
+
 
 }

app/src/main/java/apps/amine/bou/readerforselfoss/fragments/ImageFragment.kt

@@ -0,0 +1,49 @@
+package apps.amine.bou.readerforselfoss.fragments
+
+import android.os.Bundle
+import android.view.*
+import androidx.fragment.app.Fragment
+import apps.amine.bou.readerforselfoss.R
+import com.bumptech.glide.Glide
+import com.bumptech.glide.load.engine.DiskCacheStrategy
+import com.bumptech.glide.request.RequestOptions
+import kotlinx.android.synthetic.main.fragment_image.view.*
+
+class ImageFragment : Fragment() {
+
+    private lateinit var imageUrl : String
+    private val glideOptions = RequestOptions.diskCacheStrategyOf(DiskCacheStrategy.ALL)
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        imageUrl = arguments!!.getString("imageUrl")
+    }
+
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+        val view : View = inflater.inflate(R.layout.fragment_image, container, false)
+
+        view.photoView.visibility = View.VISIBLE
+        Glide.with(activity)
+                .asBitmap()
+                .apply(glideOptions)
+                .load(imageUrl)
+                .into(view.photoView)
+
+        return view
+    }
+
+    companion object {
+        private const val ARG_IMAGE = "imageUrl"
+
+        fun newInstance(
+                imageUrl : String
+        ): ImageFragment {
+            val fragment = ImageFragment()
+            val args = Bundle()
+            args.putString(ARG_IMAGE, imageUrl)
+            fragment.arguments = args
+            return fragment
+        }
+    }
+}

app/src/main/java/apps/amine/bou/readerforselfoss/utils/glide/GlideUtils.kt

@@ -14,6 +14,9 @@ import com.bumptech.glide.load.model.GlideUrl
 import com.bumptech.glide.load.model.LazyHeaders
 import com.bumptech.glide.request.RequestOptions
 import com.bumptech.glide.request.target.BitmapImageViewTarget
+import java.io.ByteArrayInputStream
+import java.io.ByteArrayOutputStream
+import java.io.InputStream
 
 fun Context.bitmapCenterCrop(config: Config, url: String, iv: ImageView) =
     Glide.with(this)
@@ -57,3 +60,10 @@ fun RequestManager.loadMaybeBasicAuth(config: Config, url: String): RequestBuild
     val glideUrl = GlideUrl(url, builder.build())
     return this.load(glideUrl)
 }
+
+fun getBitmapInputStream(bitmap:Bitmap,compressFormat: Bitmap.CompressFormat): InputStream {
+    val byteArrayOutputStream = ByteArrayOutputStream()
+    bitmap.compress(compressFormat, 80, byteArrayOutputStream)
+    val bitmapData: ByteArray = byteArrayOutputStream.toByteArray()
+    return ByteArrayInputStream(bitmapData)
+}

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

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <com.google.android.material.appbar.AppBarLayout
+        android:id="@+id/appBarLayout"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent">
+
+        <androidx.appcompat.widget.Toolbar
+            android:id="@+id/toolBar"
+            android:layout_width="match_parent"
+            android:layout_height="?attr/actionBarSize"
+            app:popupTheme="?attr/toolbarPopupTheme"
+            app:theme="@style/ToolBarStyle" />
+
+    </com.google.android.material.appbar.AppBarLayout>
+
+    <androidx.viewpager.widget.ViewPager
+        android:id="@+id/pager"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/appBarLayout" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <com.github.chrisbanes.photoview.PhotoView
+        android:id="@+id/photoView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_centerVertical="true"
+        android:layout_centerHorizontal="true"
+        android:background="@android:color/black"
+        app:srcCompat="@android:drawable/screen_background_dark" />
+
+</androidx.coordinatorlayout.widget.CoordinatorLayout>