From 808dc92cd76b406cd0b9656b0903910ba1b11b04 Mon Sep 17 00:00:00 2001
From: Sylvain Berfini <sylvain.berfini@belledonne-communications.com>
Date: Wed, 17 Sep 2025 12:17:06 +0200
Subject: [PATCH] Added PDF file preview in conversation (message bubble +
 documents list)

---
 CHANGELOG.md                                  |  1 +
 .../linphone/ui/main/chat/model/FileModel.kt  | 80 +++++++++++++++----
 .../chat_bubble_single_file_content.xml       | 15 ++++
 3 files changed, 82 insertions(+), 14 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 398ac3042..bab4b102c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ Group changes to describe their impact on the project, as follows:
 
 ### Added
 - Added the ability to edit/delete chat messages sent less than 24 hours ago.
+- Added PDF preview in conversation (message bubble & documents list)
 - Added hover effect when using a mouse (useful for tablets or devices with desktop mode)
 - Support right click on some items to open bottom sheet/menu
 - Added toggle speaker action in active call notification
diff --git a/app/src/main/java/org/linphone/ui/main/chat/model/FileModel.kt b/app/src/main/java/org/linphone/ui/main/chat/model/FileModel.kt
index 1b4c2d315..2d922731e 100644
--- a/app/src/main/java/org/linphone/ui/main/chat/model/FileModel.kt
+++ b/app/src/main/java/org/linphone/ui/main/chat/model/FileModel.kt
@@ -19,9 +19,11 @@
  */
 package org.linphone.ui.main.chat.model
 
+import android.graphics.pdf.PdfRenderer
 import android.media.MediaMetadataRetriever
 import android.media.MediaMetadataRetriever.METADATA_KEY_DURATION
 import android.media.ThumbnailUtils
+import android.os.ParcelFileDescriptor
 import android.provider.MediaStore
 import androidx.annotation.AnyThread
 import androidx.annotation.UiThread
@@ -35,6 +37,9 @@ import org.linphone.core.tools.Log
 import org.linphone.utils.FileUtils
 import org.linphone.utils.TimestampUtils
 import androidx.core.net.toUri
+import androidx.core.graphics.createBitmap
+import kotlinx.coroutines.withContext
+import java.io.File
 
 class FileModel
     @AnyThread
@@ -97,6 +102,9 @@ class FileModel
         if (!isWaitingToBeDownloaded) {
             val extension = FileUtils.getExtensionFromFileName(path)
             isPdf = extension == "pdf"
+            if (isPdf) {
+                loadPdfPreview()
+            }
 
             val mime = FileUtils.getMimeTypeFromExtension(extension)
             mimeTypeString = mime
@@ -168,21 +176,65 @@ class FileModel
     }
 
     @AnyThread
-    private fun loadVideoPreview() {
-        try {
-            Log.i("$TAG Try to create an image preview of video file [$path]")
-            val previewBitmap = ThumbnailUtils.createVideoThumbnail(
-                path,
-                MediaStore.Images.Thumbnails.MINI_KIND
-            )
-            if (previewBitmap != null) {
-                val previewPath = FileUtils.storeBitmap(previewBitmap, fileName)
-                Log.i("$TAG Preview of video file [$path] available at [$previewPath]")
-                mediaPreview.postValue(previewPath)
-                mediaPreviewAvailable.postValue(true)
+    private fun loadPdfPreview() {
+        scope.launch {
+            withContext(Dispatchers.IO) {
+                try {
+                    val pdfFileDescriptor = ParcelFileDescriptor.open(
+                        File(path),
+                        ParcelFileDescriptor.MODE_READ_ONLY
+                    )
+                    if (pdfFileDescriptor == null) {
+                        Log.e("$TAG Failed to get a file descriptor for PDF at [$path]")
+                        return@withContext
+                    }
+
+                    val pdfRenderer = PdfRenderer(pdfFileDescriptor)
+                    val pdfFirstPage = pdfRenderer.openPage(0)
+                    val previewBitmap = createBitmap(pdfFirstPage.width, pdfFirstPage.height)
+                    pdfFirstPage.render(
+                        previewBitmap,
+                        null,
+                        null,
+                        PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY
+                    )
+
+                    val previewPath = FileUtils.storeBitmap(previewBitmap, fileName)
+                    Log.i("$TAG Preview of PDF file [$path] available at [$previewPath]")
+                    mediaPreview.postValue(previewPath)
+                    mediaPreviewAvailable.postValue(true)
+
+                    previewBitmap.recycle()
+                    pdfFirstPage.close()
+                    pdfRenderer.close()
+                    pdfFileDescriptor.close()
+                } catch (e: Exception) {
+                    Log.e("$TAG Failed to get image preview for PDF file [$path]: $e")
+                }
+            }
+        }
+    }
+
+    @AnyThread
+    private fun loadVideoPreview() {
+        scope.launch {
+            withContext(Dispatchers.IO) {
+                try {
+                    Log.i("$TAG Try to create an image preview of video file [$path]")
+                    val previewBitmap = ThumbnailUtils.createVideoThumbnail(
+                        path,
+                        MediaStore.Images.Thumbnails.MINI_KIND
+                    )
+                    if (previewBitmap != null) {
+                        val previewPath = FileUtils.storeBitmap(previewBitmap, fileName)
+                        Log.i("$TAG Preview of video file [$path] available at [$previewPath]")
+                        mediaPreview.postValue(previewPath)
+                        mediaPreviewAvailable.postValue(true)
+                    }
+                } catch (e: Exception) {
+                    Log.e("$TAG Failed to get image preview for file [$path]: $e")
+                }
             }
-        } catch (e: Exception) {
-            Log.e("$TAG Failed to get image preview for file [$path]: $e")
         }
     }
 
diff --git a/app/src/main/res/layout/chat_bubble_single_file_content.xml b/app/src/main/res/layout/chat_bubble_single_file_content.xml
index 3a94ab502..221df8877 100644
--- a/app/src/main/res/layout/chat_bubble_single_file_content.xml
+++ b/app/src/main/res/layout/chat_bubble_single_file_content.xml
@@ -64,6 +64,21 @@
             app:layout_constraintEnd_toEndOf="@id/left_background"
             app:tint="?attr/color_main2_600" />
 
+        <ImageView
+            android:id="@+id/file_pdf_preview"
+            android:layout_width="@dimen/chat_bubble_grid_file_size"
+            android:layout_height="@dimen/chat_bubble_grid_file_size"
+            android:onClick="@{() -> model.onClick()}"
+            android:onLongClick="@{onLongClickListener}"
+            android:adjustViewBounds="true"
+            android:scaleType="centerCrop"
+            android:contentDescription="@string/content_description_chat_bubble_file"
+            android:visibility="@{model.isPdf &amp;&amp; model.mediaPreviewAvailable ? View.VISIBLE : View.GONE, default=gone}"
+            coilBubbleGrid="@{model.mediaPreview}"
+            coilBubbleFallback="@{fileIcon}"
+            app:layout_constraintTop_toTopOf="parent"
+            app:layout_constraintStart_toStartOf="parent" />
+
         <androidx.appcompat.widget.AppCompatTextView
             style="@style/default_text_style_600"
             android:id="@+id/audio_duration"