save images to downloads

app/src/main/AndroidManifest.xml

@@ -3,6 +3,7 @@
     package="oppen.tva">
 
     <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 
     <application
         android:name=".Tva"

app/src/main/java/oppen/tva/ui/TvaActivity.kt

@@ -17,10 +17,10 @@ import oppen.hideKeyboard
 import oppen.tva.R
 import oppen.tva.Tva
 import oppen.tva.databinding.ActivityTvaBinding
-import oppen.tva.io.gemini.GeminiResponse
-import oppen.tva.io.gemini.RuntimeCache
 import oppen.tva.io.TvaState
 import oppen.tva.io.gemini.Datasource
+import oppen.tva.io.gemini.GeminiResponse
+import oppen.tva.io.gemini.RuntimeCache
 import oppen.tva.io.history.tabs.TabHistoryInterface
 import oppen.tva.io.history.uris.HistoryInterface
 import oppen.tva.ui.content_image.ImageDialog
@@ -33,8 +33,13 @@ import oppen.tva.ui.modals_menus.set_home.SetHomeDialog
 import oppen.tva.ui.modals_menus.tabs.NewTabPopup
 import oppen.tva.ui.modals_menus.tabs.TabsDialog
 import oppen.visibleRetainingSpace
+import java.io.ByteArrayOutputStream
+import java.io.File
+import java.io.FileInputStream
+import java.io.FileOutputStream
 import java.net.URLEncoder
 
+const val CREATE_IMAGE_FILE_REQ = 628
 
 class TvaActivity : AppCompatActivity() {
 
@@ -208,9 +213,37 @@ class TvaActivity : AppCompatActivity() {
         TextDialog.show(this, state)
     }
 
+    var imageState: TvaState.ResponseImage? = null
+
     private fun renderImage(state: TvaState.ResponseImage) = runOnUiThread{
         loadingView(false)
-        ImageDialog.show(this, state)
+        ImageDialog.show(this, state){ state ->
+            imageState = state
+            val intent = Intent(Intent.ACTION_CREATE_DOCUMENT)
+            intent.addCategory(Intent.CATEGORY_OPENABLE)
+            intent.type = "image/*"
+            intent.putExtra(Intent.EXTRA_TITLE, File(state.uri.path).name)
+            startActivityForResult(intent, CREATE_IMAGE_FILE_REQ)
+        }
+    }
+
+    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+        super.onActivityResult(requestCode, resultCode, data)
+        if(resultCode == RESULT_OK && requestCode == CREATE_IMAGE_FILE_REQ){
+            if(imageState == null) return
+            data?.data?.let{ uri ->
+                val cachedFile = File(imageState!!.cacheUri.path ?: "")
+                contentResolver.openFileDescriptor(uri, "w")?.use { fileDescriptor ->
+                    FileOutputStream(fileDescriptor.fileDescriptor).use { destOutput ->
+                        val sourceChannel = FileInputStream(cachedFile).channel
+                        val destChannel = destOutput.channel
+                        sourceChannel.transferTo(0, sourceChannel.size(), destChannel)
+                        sourceChannel.close()
+                        destChannel.close()
+                    }
+                }
+            }
+        }
     }
 
     private fun loadingView(visible: Boolean) = runOnUiThread {

app/src/main/java/oppen/tva/ui/content_image/ImageDialog.kt

@@ -1,15 +1,20 @@
 package oppen.tva.ui.content_image
 
 import android.content.Context
+import android.graphics.Bitmap
+import android.net.Uri
+import android.view.MenuInflater
 import android.view.View
 import androidx.appcompat.app.AppCompatDialog
+import androidx.appcompat.widget.PopupMenu
 import kotlinx.android.synthetic.main.dialog_content_image.view.*
 import oppen.tva.R
 import oppen.tva.io.TvaState
+import java.io.FileOutputStream
 
 object ImageDialog {
 
-    fun show(context: Context, state: TvaState.ResponseImage){
+    fun show(context: Context, state: TvaState.ResponseImage, onDownloadRequest: (state: TvaState.ResponseImage) -> Unit){
         val dialog = AppCompatDialog(context, R.style.AppTheme)
 
         val view = View.inflate(context, R.layout.dialog_content_image, null)
@@ -21,6 +26,37 @@ object ImageDialog {
             dialog.dismiss()
         }
 
+        view.image_overflow.setOnClickListener {
+            val overflowMenu = PopupMenu(context, view.image_overflow)
+            val inflater: MenuInflater = overflowMenu.menuInflater
+            inflater.inflate(R.menu.image_overflow_menu, overflowMenu.menu)
+            overflowMenu.setOnMenuItemClickListener { menuItem ->
+                if(menuItem.itemId == R.id.image_overflow_save_image){
+                    onDownloadRequest(state)
+                }
+                true
+            }
+
+            overflowMenu.show()
+        }
+
         dialog.show()
     }
+
+    /**
+     *
+     * Save bitmap using Storage Access Framework Uri
+     * @param bitmap
+     * @param uri - must be a SAF Uri
+     * @param onComplete
+     */
+    fun publicExport(context: Context, bitmap: Bitmap?, uri: Uri, onComplete: (uri: Uri) -> Unit) {
+        context.contentResolver.openFileDescriptor(uri, "w")?.use {
+            FileOutputStream(it.fileDescriptor).use { outputStream ->
+                bitmap?.compress(Bitmap.CompressFormat.JPEG, 90, outputStream)
+            }
+            bitmap?.recycle()
+            onComplete(uri)
+        }
+    }
 }

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

@@ -29,8 +29,7 @@
             android:src="@drawable/vector_close" />
 
         <androidx.appcompat.widget.AppCompatImageButton
-            android:id="@+id/history_overflow"
-            android:visibility="gone"
+            android:id="@+id/image_overflow"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_centerVertical="true"

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

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:id="@+id/image_overflow_save_image"
+        android:title="@string/save_image" />
+</menu>

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

@@ -24,4 +24,5 @@
     <string name="reload">Reload</string>
     <string name="submit">Submit</string>
     <string name="search">Search</string>
+    <string name="save_image">Save Image</string>
 </resources>