Adding Note Editing

app/src/main/java/com/coldlightalchemist/notesapp/MainActivity.java

@@ -47,7 +47,7 @@ public class MainActivity extends AppCompatActivity {
         notesRecyclerView = (RecyclerView) findViewById(R.id.noteRecyclerView);
         notesRecyclerView.setLayoutManager(new LinearLayoutManager(this));
 
-        noteAdapter = new NotesRecyclerViewAdapter(db.noteDAO());
+        noteAdapter = new NotesRecyclerViewAdapter(db.noteDAO(), this::startActivity);
 
         notesRecyclerView.setAdapter(noteAdapter);
 

app/src/main/java/com/coldlightalchemist/notesapp/NewNote.java

@@ -22,6 +22,8 @@ public class NewNote extends AppCompatActivity {
 
     private Button saveNote;
 
+    private Note note;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -36,6 +38,16 @@ public class NewNote extends AppCompatActivity {
         newNoteTitle = (EditText) findViewById(R.id.newNoteTitle);
         newNoteContent = (EditText) findViewById(R.id.newNoteContent);
 
+        if(getIntent().hasExtra("editableNote")) {
+            note = (Note) getIntent().getSerializableExtra("editableNote");
+
+            newNoteTitle.getText().clear();
+            newNoteTitle.getText().append(note.noteTitle);
+
+            newNoteContent.getText().clear();
+            newNoteContent.getText().append(note.noteContent);
+        }
+
         saveNote = (Button) findViewById(R.id.saveNote);
         saveNote.setOnClickListener((v) -> {
             if(newNoteTitle.getText().toString().isEmpty() || newNoteContent.getText().toString().isEmpty()) {
@@ -43,11 +55,21 @@ public class NewNote extends AppCompatActivity {
                 return;
             }
 
-            Note note = new Note();
+            boolean noteWasNull = note == null;
+
+            if(noteWasNull) {
+                note = new Note();
+            }
+
             note.noteTitle = newNoteTitle.getText().toString();
             note.noteContent = newNoteContent.getText().toString();
 
-            NoteDB.getDB(getApplicationContext()).noteDAO().insertAll(note);
+            if(noteWasNull) {
+                NoteDB.getDB(getApplicationContext()).noteDAO().insertAll(note);
+            } else {
+                NoteDB.getDB(getApplicationContext()).noteDAO().update(note);
+            }
+
             finish();
         });
     }

app/src/main/java/com/coldlightalchemist/notesapp/NotesRecyclerViewAdapter.java

@@ -1,5 +1,6 @@
 package com.coldlightalchemist.notesapp;
 
+import android.content.Intent;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -12,9 +13,13 @@ import com.coldlightalchemist.notesapp.db.NoteDB;
 import com.coldlightalchemist.notesapp.db.dao.NoteDAO;
 import com.coldlightalchemist.notesapp.db.entities.Note;
 
+import java.util.function.Consumer;
+
 public class NotesRecyclerViewAdapter extends RecyclerView.Adapter<NotesRecyclerViewAdapter.NoteRecyclerViewHolder> {
     private final NoteDAO noteSource;
 
+    private final Consumer<Intent> activityStarter;
+
     public static class NoteRecyclerViewHolder extends RecyclerView.ViewHolder {
         private final TextView rvNoteTitle;
 
@@ -37,8 +42,9 @@ public class NotesRecyclerViewAdapter extends RecyclerView.Adapter<NotesRecycler
         }
     }
 
-    public NotesRecyclerViewAdapter(NoteDAO noteSource) {
+    public NotesRecyclerViewAdapter(NoteDAO noteSource, Consumer<Intent> activityStarter) {
         this.noteSource = noteSource;
+        this.activityStarter = activityStarter;
     }
 
     @NonNull
@@ -47,7 +53,15 @@ public class NotesRecyclerViewAdapter extends RecyclerView.Adapter<NotesRecycler
         View view = LayoutInflater.from(parent.getContext())
                 .inflate(R.layout.note_recycler_view_item, parent, false);
 
-        return new NoteRecyclerViewHolder(view);
+        NoteRecyclerViewHolder holder = new NoteRecyclerViewHolder(view);
+
+        view.setOnClickListener((v) -> {
+            Intent intent = new Intent(v.getContext(), NewNote.class);
+            intent.putExtra("editableNote", holder.getNote());
+            activityStarter.accept(intent);
+        });
+
+        return holder;
     }
 
     @Override

app/src/main/java/com/coldlightalchemist/notesapp/db/dao/NoteDAO.java

@@ -4,6 +4,7 @@ import androidx.room.Dao;
 import androidx.room.Delete;
 import androidx.room.Insert;
 import androidx.room.Query;
+import androidx.room.Update;
 
 import com.coldlightalchemist.notesapp.db.entities.Note;
 
@@ -20,6 +21,9 @@ public interface NoteDAO {
     @Query("SELECT * FROM notes WHERE note_title = :noteTitle")
     Note getNoteByTitle(String noteTitle);
 
+    @Update(entity = Note.class)
+    void update(Note note);
+
     @Insert
     void insertAll(Note... notes);
 

app/src/main/java/com/coldlightalchemist/notesapp/db/entities/Note.java

@@ -4,8 +4,10 @@ import androidx.room.ColumnInfo;
 import androidx.room.Entity;
 import androidx.room.PrimaryKey;
 
+import java.io.Serializable;
+
 @Entity(tableName = "notes")
-public class Note {
+public class Note implements Serializable {
     @PrimaryKey(autoGenerate = true)
     @ColumnInfo(name = "note_id")
     public int id;