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MihaiCristianCondreaMihaiCristianCondrea
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Add Room lesson code snippets and fix lint
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10 files changed

+288
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‎app/src/main/AndroidManifest.xml‎

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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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/**
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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)
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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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‎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 android.os.Bundle;
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import androidx.annotation.NonNull;
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import androidx.recyclerview.widget.LinearLayoutManager;
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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;
@@ -58,6 +61,10 @@ protected void onCreate(Bundle savedInstanceState) {
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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() {

‎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.fragment.app.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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‎app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/android/lessons/data/room/tabs/RoomTabLayoutFragment.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.FragmentLayoutBinding;
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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 XML layout for the Room example.
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*/
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public class RoomTabLayoutFragment 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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FragmentLayoutBinding binding = FragmentLayoutBinding.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_xml);
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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.applyXmlTheme(binding.codeView);
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} catch (IOException e) {
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Log.e("RoomTabLayout", "Error reading layout", e);
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}
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return binding.getRoot();
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}
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}
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‎app/src/main/res/layout/activity_room.xml‎

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android:layout_width="0dp"
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android:layout_height="0dp"
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android:layout_marginTop="16dp"
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android:layout_marginBottom="80dp"
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app:layout_constraintBottom_toBottomOf="parent"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toBottomOf="@id/buttonAdd" />
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<com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
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android:id="@+id/floating_button_show_syntax"
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style="@style/Widget.Material3.ExtendedFloatingActionButton.Icon.Surface"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_margin="24dp"
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android:contentDescription="@string/tooltip_show_java_code_snippet"
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android:text="@string/show_code"
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android:textSize="14sp"
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android:tooltipText="@string/tooltip_show_java_code_snippet"
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app:icon="@drawable/ic_code"
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app:layout_constraintBottom_toBottomOf="parent"
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app:layout_constraintEnd_toEndOf="parent" />
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</androidx.constraintlayout.widget.ConstraintLayout>

‎app/src/main/res/raw/text_room_java.txt‎

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// Define a Note entity with auto-generated id
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@Entity
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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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}
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// Data access object to insert and query notes
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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 note")
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List<Note> getAll();
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}
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// Database that holds the notes
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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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public abstract NoteDao noteDao();
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}
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// Usage inside an Activity
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AppDatabase db = Room.databaseBuilder(this, AppDatabase.class, "notes.db").build();
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db.noteDao().insert(new Note("Hello Room!"));
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‎app/src/main/res/raw/text_room_xml.txt‎

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<androidx.constraintlayout.widget.ConstraintLayout
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xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:app="http://schemas.android.com/apk/res-auto"
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android:layout_width="match_parent"
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android:layout_height="match_parent">
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<com.google.android.material.textfield.TextInputEditText
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android:id="@+id/editTextNote"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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android:hint="Enter note"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toTopOf="parent" />
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<androidx.recyclerview.widget.RecyclerView
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android:id="@+id/recyclerView"
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android:layout_width="0dp"
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android:layout_height="0dp"
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app:layout_constraintTop_toBottomOf="@id/editTextNote"
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app:layout_constraintBottom_toBottomOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintEnd_toEndOf="parent" />
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</androidx.constraintlayout.widget.ConstraintLayout>
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‎app/src/main/res/values/strings.xml‎

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<string name="predictive_back_gesture">Predictive back gesture</string>
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<string name="room_database">Room database</string>
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<string name="enter_note">Enter note</string>
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<string name="add_note">Add note</string>
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<string name="room_database" translatable="false">Room database</string>
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<string name="enter_note" translatable="false">Enter note</string>
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<string name="add_note" translatable="false">Add note</string>
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<string name="layouts">Layouts and views</string>
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<string name="summary_preference_android_studio_permissions">Permissions are important in Android as you can\'t do tasks, that require permissions, without requesting permissions.</string>
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<string name="summary_preference_android_studio_per_app_language_preferences">Learn how to use per-app languages to make your app more accessible and user-friendly. This feature lets you choose a different language for each app on your device, without the user changing their device language.</string>
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<string name="summary_preference_android_studio_predictive_back_gesture">Android 13 (API level 33) introduces a predictive back gesture for Android devices such as phones, large screens, and foldables. It is part of a multi-year release; when fully implemented, this feature will let users preview the destination or other result of a back gesture before fully completing it, allowing them to decide whether to continue or stay in the current view.</string>
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<string name="summary_preference_android_studio_room_database">Persist simple notes using Room, an abstraction layer over SQLite.</string>
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<string name="summary_room_database">Room is a persistence library that provides an object mapping layer on top of SQLite. This example shows how to save and display notes.</string>
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<string name="summary_preference_android_studio_room_database" translatable="false">Persist simple notes using Room, an abstraction layer over SQLite.</string>
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<string name="summary_room_database" translatable="false">Room is a persistence library that provides an object mapping layer on top of SQLite. This example shows how to save and display notes.</string>
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<string name="summary_preference_android_studio_linear_layout">A linear layout is a view group that arranges its children in a single, linear direction, either horizontally or vertically. The orientation of the layout can be specified using the android:orientation attribute. A linear layout can be used to create a variety of user interfaces, such as lists, buttons, and text fields.</string>
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<string name="summary_preference_android_studio_relative_layout">A relative layout is a layout manager in Android that positions its child views relative to each other or to the parent layout. This makes it a very versatile layout manager, as it can be used to create a wide variety of layouts.</string>
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<string name="summary_preference_android_studio_table_layout">Table layout is the process of arranging the cells, rows, and columns of a table in a visually appealing and functional way.</string>

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