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MihaiCristianCondreaMihaiCristianCondrea
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Merge pull request #92 from MihaiCristianCondrea/codex/create-roomactivity-with-note-entity-and-dao
Add Room database lesson with basic CRUD demo
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‎CHANGELOG.md‎

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- **Minor**: Added a search function for lessons.
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- **Patch**: Optimized app performance for smoother operation.
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- **Patch**: Updated several components to improve compatibility.
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- **New**: Added a Room database lesson demonstrating entity, DAO, and code viewer integration.
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# Version 5.0.1:
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‎app/build.gradle‎

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implementation libs.codeview
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implementation libs.hilt.android
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annotationProcessor libs.hilt.compiler
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implementation libs.androidx.room.runtime
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annotationProcessor libs.androidx.room.compiler
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// Testing
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testImplementation libs.junit

‎app/src/main/AndroidManifest.xml‎

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android:label="@string/navigation_drawer"
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android:parentActivityName=".ui.screens.main.MainActivity" />
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<activity
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android:name=".ui.screens.android.lessons.data.room.RoomActivity"
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android:exported="false"
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android:label="@string/room_database"
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android:parentActivityName=".ui.screens.main.MainActivity" />
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<activity
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android:name=".ui.screens.android.lessons.data.room.RoomCodeActivity"
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android:exported="false"
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android:label="@string/room_database"
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android:parentActivityName=".ui.screens.android.lessons.data.room.RoomActivity" />
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<activity
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android:name=".ui.screens.settings.SettingsActivity"
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android:exported="false"

‎app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/android/lessons/data/room/AppDatabase.java‎

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package com.d4rk.androidtutorials.java.ui.screens.android.lessons.data.room;
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import android.content.Context;
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import androidx.room.Database;
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import androidx.room.Room;
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import androidx.room.RoomDatabase;
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/**
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* The Room database that holds the notes.
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*/
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@Database(entities = {Note.class}, version = 1, exportSchema = false)
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public abstract class AppDatabase extends RoomDatabase {
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private static volatile AppDatabase INSTANCE;
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public abstract NoteDao noteDao();
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public static AppDatabase getInstance(Context context) {
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if (INSTANCE == null) {
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synchronized (AppDatabase.class) {
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if (INSTANCE == null) {
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INSTANCE = Room.databaseBuilder(context.getApplicationContext(),
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AppDatabase.class, "notes_db").build();
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}
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}
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}
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return INSTANCE;
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}
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}

‎app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/android/lessons/data/room/Note.java‎

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package com.d4rk.androidtutorials.java.ui.screens.android.lessons.data.room;
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import androidx.room.Entity;
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import androidx.room.PrimaryKey;
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/**
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* Simple Note entity stored in the Room database.
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*/
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@Entity(tableName = "notes")
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public class Note {
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@PrimaryKey(autoGenerate = true)
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public int id;
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public String text;
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public Note(String text) {
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this.text = text;
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}
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public String getText() {
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return text;
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}
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}

‎app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/android/lessons/data/room/NoteDao.java‎

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package com.d4rk.androidtutorials.java.ui.screens.android.lessons.data.room;
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import androidx.room.Dao;
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import androidx.room.Insert;
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import androidx.room.Query;
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import java.util.List;
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/**
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* Data Access Object for {@link Note}.
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*/
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@Dao
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public interface NoteDao {
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@Insert
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void insert(Note note);
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@Query("SELECT * FROM notes")
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List<Note> getAll();
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}

‎app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/android/lessons/data/room/RoomActivity.java‎

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package com.d4rk.androidtutorials.java.ui.screens.android.lessons.data.room;
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import android.content.Intent;
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import android.os.Bundle;
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import android.os.Handler;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import androidx.annotation.NonNull;
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import androidx.recyclerview.widget.LinearLayoutManager;
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import androidx.recyclerview.widget.RecyclerView;
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import com.d4rk.androidtutorials.java.R;
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import com.d4rk.androidtutorials.java.databinding.ActivityRoomBinding;
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import com.d4rk.androidtutorials.java.ui.components.navigation.UpNavigationActivity;
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import com.d4rk.androidtutorials.java.utils.EdgeToEdgeDelegate;
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import com.google.android.material.textview.MaterialTextView;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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/**
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* Demonstrates basic Room usage by inserting and reading notes.
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*/
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public class RoomActivity extends UpNavigationActivity {
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private final Handler handler = new Handler();
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private ActivityRoomBinding binding;
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private NotesAdapter adapter;
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private AppDatabase db;
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private final ExecutorService executor = Executors.newSingleThreadExecutor();
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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binding = ActivityRoomBinding.inflate(getLayoutInflater());
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setContentView(binding.getRoot());
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EdgeToEdgeDelegate edgeToEdgeDelegate = new EdgeToEdgeDelegate(this);
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edgeToEdgeDelegate.applyEdgeToEdge(binding.constraintLayout);
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db = AppDatabase.getInstance(this);
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binding.recyclerView.setLayoutManager(new LinearLayoutManager(this));
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adapter = new NotesAdapter();
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binding.recyclerView.setAdapter(adapter);
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loadNotes();
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binding.buttonAdd.setOnClickListener(v -> {
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String text = String.valueOf(binding.editTextNote.getText()).trim();
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if (!text.isEmpty()) {
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executor.execute(() -> {
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db.noteDao().insert(new Note(text));
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runOnUiThread(() -> {
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binding.editTextNote.setText("");
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loadNotes();
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});
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});
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}
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});
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binding.floatingButtonShowSyntax.setOnClickListener(v ->
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startActivity(new Intent(RoomActivity.this, RoomCodeActivity.class)));
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handler.postDelayed(() -> binding.floatingButtonShowSyntax.shrink(), 5000);
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}
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private void loadNotes() {
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executor.execute(() -> {
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List<Note> notes = db.noteDao().getAll();
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runOnUiThread(() -> adapter.setNotes(notes));
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});
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}
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private static class NotesAdapter extends RecyclerView.Adapter<NotesAdapter.NoteViewHolder> {
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private List<Note> notes = new ArrayList<>();
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void setNotes(List<Note> notes) {
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this.notes = notes;
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notifyDataSetChanged();
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}
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@NonNull
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@Override
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public NoteViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
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View view = LayoutInflater.from(parent.getContext())
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.inflate(R.layout.item_note, parent, false);
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return new NoteViewHolder(view);
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}
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@Override
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public void onBindViewHolder(@NonNull NoteViewHolder holder, int position) {
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holder.textView.setText(notes.get(position).getText());
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}
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@Override
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public int getItemCount() {
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return notes.size();
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}
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static class NoteViewHolder extends RecyclerView.ViewHolder {
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final MaterialTextView textView;
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NoteViewHolder(View itemView) {
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super(itemView);
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textView = itemView.findViewById(R.id.textViewNote);
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}
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}
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}
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}

‎app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/android/lessons/data/room/RoomCodeActivity.java‎

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package com.d4rk.androidtutorials.java.ui.screens.android.lessons.data.room;
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import android.os.Bundle;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import androidx.fragment.app.Fragment;
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import androidx.viewpager2.adapter.FragmentStateAdapter;
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import com.d4rk.androidtutorials.java.R;
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import com.d4rk.androidtutorials.java.databinding.ActivityTabLayoutBinding;
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import com.d4rk.androidtutorials.java.ui.components.navigation.UpNavigationActivity;
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import com.d4rk.androidtutorials.java.ui.screens.android.lessons.data.room.tabs.RoomTabCodeFragment;
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import com.d4rk.androidtutorials.java.ui.screens.android.lessons.data.room.tabs.RoomTabLayoutFragment;
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import com.d4rk.androidtutorials.java.utils.EdgeToEdgeDelegate;
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import com.google.android.material.tabs.TabLayoutMediator;
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import java.util.ArrayList;
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/**
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* Displays Java and XML snippets for the Room database example.
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*/
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public class RoomCodeActivity extends UpNavigationActivity {
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private ActivityTabLayoutBinding binding;
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@Override
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protected void onCreate(@Nullable Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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binding = ActivityTabLayoutBinding.inflate(getLayoutInflater());
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setContentView(binding.getRoot());
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EdgeToEdgeDelegate edgeToEdgeDelegate = new EdgeToEdgeDelegate(this);
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edgeToEdgeDelegate.applyEdgeToEdge(binding.appBarLayout);
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setupViewPager();
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new TabLayoutMediator(binding.tabs, binding.viewpager, (tab, position) -> {
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ViewPagerAdapter adapter = (ViewPagerAdapter) binding.viewpager.getAdapter();
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if (adapter != null) {
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tab.setText(adapter.getPageTitle(position));
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}
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}).attach();
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}
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private void setupViewPager() {
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ViewPagerAdapter adapter = new ViewPagerAdapter(this);
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adapter.addFragment(new RoomTabCodeFragment(), getString(R.string.code_java));
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adapter.addFragment(new RoomTabLayoutFragment(), getString(R.string.layout_xml));
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binding.viewpager.setAdapter(adapter);
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}
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private static class ViewPagerAdapter extends FragmentStateAdapter {
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private final ArrayList<Fragment> fragmentList = new ArrayList<>();
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private final ArrayList<String> fragmentTitleList = new ArrayList<>();
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ViewPagerAdapter(@NonNull UpNavigationActivity activity) {
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super(activity);
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}
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void addFragment(@NonNull Fragment fragment, @NonNull String title) {
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fragmentList.add(fragment);
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fragmentTitleList.add(title);
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}
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@NonNull
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@Override
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public Fragment createFragment(int position) {
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return fragmentList.get(position);
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}
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@Override
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public int getItemCount() {
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return fragmentList.size();
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}
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CharSequence getPageTitle(int position) {
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return fragmentTitleList.get(position);
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}
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}
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}
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‎app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/android/lessons/data/room/tabs/RoomTabCodeFragment.java‎

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package com.d4rk.androidtutorials.java.ui.screens.android.lessons.data.room.tabs;
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import android.content.SharedPreferences;
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import android.graphics.Typeface;
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import android.os.Bundle;
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import android.util.Log;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import androidx.annotation.NonNull;
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import androidx.fragment.app.Fragment;
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import androidx.preference.PreferenceManager;
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import com.d4rk.androidtutorials.java.R;
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import com.d4rk.androidtutorials.java.databinding.FragmentCodeBinding;
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import com.d4rk.androidtutorials.java.utils.CodeHighlighter;
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import com.d4rk.androidtutorials.java.utils.CodeViewUtils;
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import com.d4rk.androidtutorials.java.utils.FontManager;
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import com.google.android.gms.ads.AdRequest;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import me.zhanghai.android.fastscroll.FastScrollerBuilder;
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/**
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* Shows the Java implementation for the Room example.
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*/
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public class RoomTabCodeFragment extends Fragment {
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@Override
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public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
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FragmentCodeBinding binding = FragmentCodeBinding.inflate(inflater, container, false);
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new FastScrollerBuilder(binding.scrollView).useMd2Style().build();
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binding.adView.loadAd(new AdRequest.Builder().build());
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SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(requireContext());
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Typeface monospaceFont = FontManager.getMonospaceFont(requireContext(), prefs);
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CodeViewUtils.applyDefaults(monospaceFont, binding.codeView);
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StringBuilder builder = new StringBuilder();
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InputStream inputStream = getResources().openRawResource(R.raw.text_room_java);
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try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))) {
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String line;
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while ((line = reader.readLine()) != null) {
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builder.append(line).append('\n');
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}
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binding.codeView.setText(builder.toString());
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CodeHighlighter.applyJavaTheme(binding.codeView);
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} catch (IOException e) {
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Log.e("RoomTabCode", "Error reading code", e);
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}
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return binding.getRoot();
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}
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}
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