app/build.gradle.kts

@@ -45,4 +45,5 @@ dependencies {
     androidTestImplementation(libs.ext.junit)
     androidTestImplementation(libs.espresso.core)
     annotationProcessor(libs.room.compiler)
+    implementation("com.github.chrisbanes:PhotoView:2.3.0")
 }

app/src/main/AndroidManifest.xml

@@ -23,6 +23,11 @@
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
+
+        <activity android:name=".ui.sheetdisplay.NoteSheetDisplayActivity"
+                  android:theme="@style/Theme.AppCompat.NoActionBar">
+            <!-- Intent Filter hinzufügen, wenn Activity vom Launcher oder externen Apps aufgerufen werden soll -->
+        </activity>
     </application>
 
 </manifest>

app/src/main/java/com/stormtales/notevault/data/dao/SongDao.java

@@ -26,4 +26,7 @@ public interface SongDao {
 
     @Query("SELECT * FROM NoteSheet WHERE songID = :songID")
     List<NoteSheet> getNoteSheetsBySong(int songID);
+
+    @Query("SELECT localFileName FROM NoteSheet WHERE songID = :songID")
+    List<String> getNoteSheetFilesBySongID(int songID);
 }

app/src/main/java/com/stormtales/notevault/data/repositories/SongRepository.java

@@ -76,4 +76,11 @@ public class SongRepository {
             songDao.deleteNoteSheets(noteSheets);
         });
     }
+
+    public void getNoteSheetFilesBySongID(int songID, Callback<List<String>> callback) {
+        Executors.newSingleThreadExecutor().execute(()-> {
+            List<String> noteSheetFiles = songDao.getNoteSheetFilesBySongID(songID);
+            callback.onResult(noteSheetFiles);
+        });
+    }
 }

app/src/main/java/com/stormtales/notevault/ui/home/HomeFragment.java

@@ -24,6 +24,7 @@ import com.stormtales.notevault.R;
 import com.stormtales.notevault.data.entities.Song;
 import com.stormtales.notevault.data.repositories.SongRepository;
 import com.stormtales.notevault.databinding.FragmentHomeBinding;
+import com.stormtales.notevault.ui.sheetdisplay.NoteSheetDisplayActivity;
 import com.stormtales.notevault.ui.songeditor.SongEditorDialog;
 
 import java.util.ArrayList;
@@ -84,7 +85,7 @@ public class HomeFragment extends Fragment {
         });
 
         // RecyclerView einrichten
-        songAdapter = new SongAdapter(new ArrayList<>(), this::onEditSong, this::onDeleteSong);
+        songAdapter = new SongAdapter(new ArrayList<>(), this::onEditSong, this::onDeleteSong, this::onOpenSong);
         recyclerView.setAdapter(songAdapter);
         recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
         DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(), LinearLayoutManager.VERTICAL);
@@ -121,4 +122,17 @@ public class HomeFragment extends Fragment {
     public void onDeleteSong(Song song) {
         this.homeViewModel.deleteSong(song);
     }
+
+    public void onOpenSong(Song song) {
+        homeViewModel.getSongRepository().getNoteSheetFilesBySongID(song.getLocalID(), result -> {
+            String[] noteSheetFiles = new String[result.size()];
+            for(int i = 0; i < result.size(); i++) {
+                noteSheetFiles[i] = result.get(i);
+            }
+            Intent intent = new Intent(getContext(), NoteSheetDisplayActivity.class);
+            intent.putExtra("imageUris", noteSheetFiles);
+            getContext().startActivity(intent);
+
+        });
+    }
 }

app/src/main/java/com/stormtales/notevault/ui/home/HomeViewModel.java

@@ -81,4 +81,8 @@ public class HomeViewModel extends ViewModel {
             allSongs.setValue(currentSongs);
         }
     }
+
+    public SongRepository getSongRepository() {
+        return songRepository;
+    }
 }

app/src/main/java/com/stormtales/notevault/ui/home/SongAdapter.java

@@ -20,11 +20,13 @@ public class SongAdapter extends RecyclerView.Adapter<SongAdapter.SongViewHolder
     private List<Song> songList;
     private OnEditSongListener onEditSongListener;
     private OnDeleteSongListener onDeleteSongListener;
+    private OnOpenSongListener onOpenSongListener;
 
-    public SongAdapter(List<Song> songList, OnEditSongListener onEditSongListener, OnDeleteSongListener onDeleteSongListener) {
+    public SongAdapter(List<Song> songList, OnEditSongListener onEditSongListener, OnDeleteSongListener onDeleteSongListener, OnOpenSongListener onOpenSongListener) {
         this.songList = songList;
         this.onEditSongListener = onEditSongListener;
         this.onDeleteSongListener = onDeleteSongListener;
+        this.onOpenSongListener = onOpenSongListener;
     }
 
     public void updateData(List<Song> songs) {
@@ -37,7 +39,7 @@ public class SongAdapter extends RecyclerView.Adapter<SongAdapter.SongViewHolder
         Log.d("SongAdapter", "Data updated: " + this.songList.size());
     }
 
-    public static class SongViewHolder extends RecyclerView.ViewHolder {
+    public class SongViewHolder extends RecyclerView.ViewHolder {
         TextView textYear, textComposition, textTitle;
         ImageButton editButton, deleteButton;
 
@@ -48,6 +50,14 @@ public class SongAdapter extends RecyclerView.Adapter<SongAdapter.SongViewHolder
             textTitle = itemView.findViewById(R.id.text_title);
             editButton = itemView.findViewById(R.id.edit_song_button);
             deleteButton = itemView.findViewById(R.id.delete_song_button);
+
+            textTitle.setOnClickListener(v -> {
+                int position = getAdapterPosition();
+                if (position != RecyclerView.NO_POSITION) {
+                    Song song = songList.get(position);
+                    onOpenSongListener.onOpenSong(song);
+                }
+            });
         }
     }
 
@@ -82,4 +92,8 @@ public class SongAdapter extends RecyclerView.Adapter<SongAdapter.SongViewHolder
     public interface OnDeleteSongListener {
         void onDeleteSong(Song song);
     }
+
+    public interface OnOpenSongListener {
+        void onOpenSong(Song song);
+    }
 }

app/src/main/java/com/stormtales/notevault/ui/sheetdisplay/ImagePagerAdapter.java

@@ -0,0 +1,51 @@
+package com.stormtales.notevault.ui.sheetdisplay;
+
+
+import android.content.Context;
+import android.net.Uri;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
+import com.github.chrisbanes.photoview.PhotoView;
+import com.stormtales.notevault.R;
+
+import java.util.List;
+
+public class ImagePagerAdapter extends RecyclerView.Adapter<ImagePagerAdapter.ImageViewHolder> {
+    private final List<String> imageUris;
+    private final Context context;
+
+    public ImagePagerAdapter(Context context, List<String> imageUris) {
+        this.context = context;
+        this.imageUris = imageUris;
+    }
+
+    @NonNull
+    @Override
+    public ImageViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        View view = LayoutInflater.from(context).inflate(R.layout.item_image, parent, false);
+        return new ImageViewHolder(view);
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull ImageViewHolder holder, int position) {
+        Uri uri = Uri.parse(imageUris.get(position));
+        holder.photoView.setImageURI(uri);
+    }
+
+    @Override
+    public int getItemCount() {
+        return imageUris.size();
+    }
+
+    static class ImageViewHolder extends RecyclerView.ViewHolder {
+        PhotoView photoView;
+
+        ImageViewHolder(View itemView) {
+            super(itemView);
+            photoView = itemView.findViewById(R.id.photoView);
+        }
+    }
+}

app/src/main/java/com/stormtales/notevault/ui/sheetdisplay/NoteSheetDisplayActivity.java

@@ -0,0 +1,31 @@
+package com.stormtales.notevault.ui.sheetdisplay;
+
+import android.content.Intent;
+import android.os.Bundle;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.viewpager2.widget.ViewPager2;
+import com.stormtales.notevault.R;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class NoteSheetDisplayActivity extends AppCompatActivity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_note_sheet_viewer); // Erstelle eine Layout-Datei
+
+        ViewPager2 imageView = findViewById(R.id.viewPager); // Angenommen, du hast ein ImageView
+
+        // Die URI aus dem Intent erhalten
+        Intent intent = getIntent();
+        String[] imageUris = intent.getStringArrayExtra("imageUris");
+        if (imageUris != null) {
+            List<String> uriList = Arrays.asList(imageUris);
+            ImagePagerAdapter adapter = new ImagePagerAdapter(this, uriList);
+            imageView.setAdapter(adapter); // Setze die URI in das ImageView
+        } else {
+            throw new NullPointerException();
+        }
+    }
+}

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

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent">
+
+
+    <androidx.viewpager2.widget.ViewPager2
+            android:id="@+id/viewPager"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent" />
+</RelativeLayout>

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

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+             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:scaleType="fitCenter" />
+</FrameLayout>

settings.gradle.kts

@@ -16,6 +16,7 @@ dependencyResolutionManagement {
     repositories {
         google()
         mavenCentral()
+        maven { url = uri("https://www.jitpack.io") }
     }
 }