poprawiono bazę room - metoda getNoteRoomDatabase synchronized

app/src/main/java/com/example/notatkon/FirstFragment.java

@@ -1,34 +0,0 @@
-package com.example.notatkon;
-
-import android.os.Bundle;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
-
-import androidx.annotation.NonNull;
-import androidx.fragment.app.Fragment;
-import androidx.navigation.fragment.NavHostFragment;
-
-public class FirstFragment extends Fragment {
-
-    @Override
-    public View onCreateView(
-            LayoutInflater inflater, ViewGroup container,
-            Bundle savedInstanceState
-    ) {
-        // Inflate the layout for this fragment
-        return inflater.inflate(R.layout.fragment_first, container, false);
-    }
-
-    public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
-        super.onViewCreated(view, savedInstanceState);
-
-        view.findViewById(R.id.button_first).setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View view) {
-                NavHostFragment.findNavController(FirstFragment.this)
-                        .navigate(R.id.action_FirstFragment_to_SecondFragment);
-            }
-        });
-    }
-}

app/src/main/java/com/example/notatkon/SecondFragment.java

@@ -1,34 +0,0 @@
-package com.example.notatkon;
-
-import android.os.Bundle;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
-
-import androidx.annotation.NonNull;
-import androidx.fragment.app.Fragment;
-import androidx.navigation.fragment.NavHostFragment;
-
-public class SecondFragment extends Fragment {
-
-    @Override
-    public View onCreateView(
-            LayoutInflater inflater, ViewGroup container,
-            Bundle savedInstanceState
-    ) {
-        // Inflate the layout for this fragment
-        return inflater.inflate(R.layout.fragment_second, container, false);
-    }
-
-    public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
-        super.onViewCreated(view, savedInstanceState);
-
-        view.findViewById(R.id.button_second).setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View view) {
-                NavHostFragment.findNavController(SecondFragment.this)
-                        .navigate(R.id.action_SecondFragment_to_FirstFragment);
-            }
-        });
-    }
-}

app/src/main/java/com/example/notatkon/database/NoteRoomDatabase.java

@@ -10,6 +10,9 @@ import androidx.room.Database;
 import androidx.room.Room;
 import androidx.room.RoomDatabase;
 
+import com.example.notatkon.dao.NoteDao;
+import com.example.notatkon.entities.NoteEntity;
+
 @Database(entities = {NoteEntity.class},
         version = 1,
         exportSchema = false)
@@ -18,18 +21,16 @@ public abstract class NoteRoomDatabase extends RoomDatabase {
 
     public abstract NoteDao noteDao();
 
-    private static volatile NoteRoomDatabase INSTANCE;
+    private static NoteRoomDatabase noteRoomDatabase;
 
-    public static NoteRoomDatabase getNoteRoomDatabase(final Context context) {
+    public static synchronized NoteRoomDatabase getNoteRoomDatabase(final Context context) {
-        if (INSTANCE == null) {
+        if (noteRoomDatabase == null) {
-            synchronized (NoteRoomDatabase.class) {
+            noteRoomDatabase = Room.databaseBuilder(
-                if (INSTANCE == null) {
+                    context,
-                    INSTANCE = Room.databaseBuilder(context.getApplicationContext(),
+                    NoteRoomDatabase.class,
-                            NoteRoomDatabase.class, "note_database")
+                    "note_database"
-                            .build();
+            ).build();
-                }
-            }
         }
-        return INSTANCE;
+        return noteRoomDatabase;
     }
 }

app/src/main/java/com/example/notatkon/note/MainActivity.java

@@ -1,15 +1,17 @@
-package com.example.notatkon;
+package com.example.notatkon.note;
 
 import android.content.Intent;
 import android.os.AsyncTask;
 import android.os.Bundle;
-import android.view.View;
+import android.util.Log;
 import android.widget.ImageView;
 
 import androidx.appcompat.app.AppCompatActivity;
 
-import com.example.notatkon.database.NoteEntity;
+import com.example.notatkon.R;
-import com.google.android.material.floatingactionbutton.FloatingActionButton;
+import com.example.notatkon.entities.NoteEntity;
+import com.example.notatkon.database.NoteRoomDatabase;
+import com.example.notatkon.note.CreateNote;
 
 import java.util.List;
 
@@ -107,14 +109,18 @@ public class MainActivity extends AppCompatActivity {
 
             @Override
             protected List<NoteEntity> doInBackground(Void... voids) {
-                return null;
+                //return null;
+                return (List<NoteEntity>) NoteRoomDatabase
+                        .getNoteRoomDatabase(getApplicationContext())
+                        .noteDao().getNotes();
             }
 
             @Override
             protected void onPostExecute(List<NoteEntity> noteEntities) {
                 super.onPostExecute(noteEntities);
+                Log.d("NOTES", noteEntities.toString());
             }
         }
+        new GetNotesTask().execute();
     }
-
 }