fix #135, adding a basic PDF Viewer

app/build.gradle

@@ -64,10 +64,11 @@ android {
 }
 
 dependencies {
-    implementation 'com.github.SimpleMobileTools:Simple-Commons:d5f0ed856d'
+    implementation 'com.github.SimpleMobileTools:Simple-Commons:d6434b3912'
     implementation 'com.github.Stericson:RootTools:df729dcb13'
     implementation 'com.github.Stericson:RootShell:1.6'
     implementation 'com.alexvasilkov:gesture-views:2.5.2'
     implementation 'androidx.documentfile:documentfile:1.0.1'
     implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.1.0'
+    implementation 'com.github.barteksc:android-pdf-viewer:2.8.2'
 }

app/proguard-rules.pro

@@ -2,3 +2,4 @@
 -dontnote org.apache.http.**
 -keep class com.simplemobiletools.** { *; }
 -dontwarn com.simplemobiletools.**
+-keep class com.shockwave.**

app/src/main/kotlin/com/simplemobiletools/filemanager/pro/activities/MainActivity.kt

@@ -620,7 +620,7 @@ class MainActivity : SimpleActivity() {
 
     private fun launchAbout() {
         closeSearchIfOpen()
-        val licenses = LICENSE_GLIDE or LICENSE_PATTERN or LICENSE_REPRINT or LICENSE_GESTURE_VIEWS
+        val licenses = LICENSE_GLIDE or LICENSE_PATTERN or LICENSE_REPRINT or LICENSE_GESTURE_VIEWS or LICENSE_PDF_VIEWER
 
         val faqItems = arrayListOf(
             FAQItem(R.string.faq_3_title_commons, R.string.faq_3_text_commons),

app/src/main/kotlin/com/simplemobiletools/filemanager/pro/activities/PDFViewerActivity.kt

@@ -2,7 +2,10 @@ package com.simplemobiletools.filemanager.pro.activities
 
 import android.os.Bundle
 import com.simplemobiletools.commons.extensions.checkAppSideloading
+import com.simplemobiletools.commons.extensions.getFilenameFromUri
+import com.simplemobiletools.commons.extensions.getProperBackgroundColor
 import com.simplemobiletools.filemanager.pro.R
+import kotlinx.android.synthetic.main.activity_pdf_viewer.*
 
 class PDFViewerActivity : SimpleActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -12,5 +15,25 @@ class PDFViewerActivity : SimpleActivity() {
         if (checkAppSideloading()) {
             return
         }
+
+        checkIntent()
+    }
+
+    private fun checkIntent() {
+        val uri = intent.data
+        if (uri == null) {
+            finish()
+            return
+        }
+
+        val filename = getFilenameFromUri(uri)
+        if (filename.isNotEmpty()) {
+            title = filename
+        }
+
+        pdf_viewer.setBackgroundColor(getProperBackgroundColor())
+        pdf_viewer.fromUri(uri)
+            .spacing(15)
+            .load()
     }
 }

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

@@ -4,4 +4,9 @@
     android:layout_width="match_parent"
     android:layout_height="wrap_content">
 
+    <com.github.barteksc.pdfviewer.PDFView
+        android:id="@+id/pdf_viewer"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
 </RelativeLayout>