Support pdf files in file viewer (#259)

auto convert EOL

this fix it for me

fix layout

implement support for pdf files in file viewer

Co-authored-by: 6543 <6543@obermui.de>
Reviewed-on: https://gitea.com/gitnex/GitNex/pulls/259
Reviewed-by: 6543 <6543@noreply.gitea.io>

.gitattributes

@@ -0,0 +1 @@
+* text=auto eol=lf

README.md

@@ -89,5 +89,6 @@ Open source libraries
 - Apache/commons-io
 - Caverock/androidsvg
 - Droidsonroids.gif/android-gif-drawable
+- Barteksc/AndroidPdfViewer
 
 [Follow me on Fediverse - mastodon.social/@mmarif](https://mastodon.social/@mmarif)

app/build.gradle

@@ -23,12 +23,12 @@ android {
 }
 
 dependencies {
-    def lifecycle_version = "2.2.0-rc03"
+    def lifecycle_version = "2.2.0"
     final def markwon_version = "4.1.1"
 
     implementation fileTree(include: ['*.jar'], dir: 'libs')
     implementation "androidx.appcompat:appcompat:1.1.0"
-    implementation "com.google.android.material:material:1.2.0-alpha03"
+    implementation "com.google.android.material:material:1.2.0-alpha04"
     implementation "androidx.constraintlayout:constraintlayout:1.1.3"
     implementation "androidx.legacy:legacy-support-v4:1.0.0"
     testImplementation "junit:junit:4.12"
@@ -69,4 +69,5 @@ dependencies {
     implementation "commons-io:commons-io:2.6"
     implementation "com.github.chrisbanes:PhotoView:2.3.0"
     implementation "com.pddstudio:highlightjs-android:1.5.0"
+    implementation "com.github.barteksc:android-pdf-viewer:3.2.0-beta.1"
 }

app/src/main/java/org/mian/gitnex/activities/FileViewActivity.java

@@ -15,6 +15,8 @@ import android.widget.TextView;
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
+import com.github.barteksc.pdfviewer.PDFView;
+import com.github.barteksc.pdfviewer.util.FitPolicy;
 import com.github.chrisbanes.photoview.PhotoView;
 import com.pddstudio.highlightjs.HighlightJsView;
 import com.pddstudio.highlightjs.models.Theme;
@@ -44,6 +46,8 @@ public class FileViewActivity extends AppCompatActivity {
     final Context ctx = this;
     private ProgressBar mProgressBar;
     private byte[] imageData;
+    private PDFView pdfView;
+    private byte[] decodedPdf;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -68,6 +72,7 @@ public class FileViewActivity extends AppCompatActivity {
         imageView = findViewById(R.id.imageView);
         singleFileContents.setVisibility(View.GONE);
         mProgressBar = findViewById(R.id.progress_bar);
+        pdfView = findViewById(R.id.pdfView);
 
         String singleFileName = getIntent().getStringExtra("singleFileName");
 
@@ -140,6 +145,33 @@ public class FileViewActivity extends AppCompatActivity {
                             singleCodeContents.setShowLineNumbers(true);
                             singleCodeContents.setSource(appUtil.decodeBase64(response.body().getContent()));
 
+                        }
+                        else if (appUtil.pdfExtension(fileExtension)) { // file is pdf
+
+                            imageView.setVisibility(View.GONE);
+                            singleFileContents.setVisibility(View.GONE);
+                            singleCodeContents.setVisibility(View.GONE);
+                            pdfView.setVisibility(View.VISIBLE);
+
+                            decodedPdf = Base64.decode(response.body().getContent(), Base64.DEFAULT);
+                            pdfView.fromBytes(decodedPdf)
+                                    .enableSwipe(true)
+                                    .swipeHorizontal(false)
+                                    .enableDoubletap(true)
+                                    .defaultPage(0)
+                                    .enableAnnotationRendering(false)
+                                    .password(null)
+                                    .scrollHandle(null)
+                                    .enableAntialiasing(true)
+                                    .spacing(0)
+                                    .autoSpacing(true)
+                                    .pageFitPolicy(FitPolicy.WIDTH)
+                                    .fitEachPage(true)
+                                    .pageSnap(false)
+                                    .pageFling(true)
+                                    .nightMode(true)
+                                    .load();
+
                         }
                         else { // file type not known - plain text view
 

app/src/main/java/org/mian/gitnex/util/AppUtil.java

@@ -224,6 +224,14 @@ public class AppUtil {
 
     }
 
+    public Boolean pdfExtension(String ext) {
+
+        String[] extValues = new String[] {"pdf"};
+
+        return Arrays.asList(extValues).contains(ext);
+
+    }
+
     public Boolean imageExtension(String ext) {
 
         String[] extValues = new String[] {"jpg", "jpeg", "gif", "png", "ico"};

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

@@ -71,6 +71,22 @@
 
     </LinearLayout>
 
+    <LinearLayout
+        android:layout_marginTop="55dp"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:background="@color/colorPrimary"
+        android:orientation="vertical">
+
+        <com.github.barteksc.pdfviewer.PDFView
+            android:id="@+id/pdfView"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:background="@color/black"
+            android:visibility="visible" />
+
+    </LinearLayout>
+
     <com.pddstudio.highlightjs.HighlightJsView
         android:id="@+id/singleCodeContents"
         android:layout_width="match_parent"