[WIP] Add note taking functionality to app

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+*.apk
+*.ap_
+*.aab
+*.dex
+*.class
+bin/
+gen/
+out/
+.gradletasknamecache
+app/build/
+*/build/
+gradle-app.setting
+!gradle-wrapper.jar
+!gradle-wrapper.properties

README.md

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-# Android_Note-taking
+# Android Note-Taking App
+
+A simple and functional note-taking application for Android that allows users to create, edit, view, and delete notes.
+
+## Features
+
+- **Create Notes**: Add new notes with titles and content
+- **View Notes**: Browse all your notes in a clean list view
+- **Edit Notes**: Modify existing notes anytime
+- **Delete Notes**: Remove notes you no longer need
+- **Persistent Storage**: Notes are saved locally using SharedPreferences with Gson serialization
+- **Modern UI**: Material Design components with CardView and FloatingActionButton
+
+## Technical Details
+
+- **Minimum SDK**: Android 5.0 (API 21)
+- **Target SDK**: Android 13 (API 33)
+- **Language**: Java
+- **Architecture**: Simple MVC pattern
+- **Data Persistence**: SharedPreferences with Gson
+
+## Project Structure
+
+```
+app/
+├── src/main/
+│   ├── java/com/notetaking/app/
+│   │   ├── MainActivity.java          # Main screen showing list of notes
+│   │   ├── NoteEditorActivity.java    # Screen for creating/editing notes
+│   │   ├── Note.java                  # Note data model
+│   │   ├── NotesAdapter.java          # RecyclerView adapter for notes list
+│   │   └── NotesManager.java          # Handles data persistence
+│   ├── res/
+│   │   ├── layout/                    # XML layouts
+│   │   ├── values/                    # Strings, colors, themes
+│   │   └── menu/                      # Menu resources
+│   └── AndroidManifest.xml
+└── build.gradle
+```
+
+## Building the Project
+
+1. Clone the repository:
+   ```bash
+   git clone https://github.com/Jeffcheung205/Android_Note-taking.git
+   ```
+
+2. Open the project in Android Studio
+
+3. Sync Gradle files
+
+4. Run on an emulator or physical device
+
+## Usage
+
+1. **Add a Note**: Tap the floating action button (+) on the main screen
+2. **Edit a Note**: Tap on any note in the list to open and edit it
+3. **Save a Note**: Tap the save icon in the editor toolbar
+4. **Delete a Note**: Open a note and tap the delete icon in the toolbar
+
+## Dependencies
+
+- AndroidX AppCompat
+- Material Components
+- RecyclerView
+- CardView
+- ConstraintLayout
+- Gson (for JSON serialization)
+
+## License
+
+This project is open source and available for educational purposes.

app/build.gradle

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+plugins {
+    id 'com.android.application'
+}
+
+android {
+    namespace 'com.notetaking.app'
+    compileSdk 33
+
+    defaultConfig {
+        applicationId "com.notetaking.app"
+        minSdk 21
+        targetSdk 33
+        versionCode 1
+        versionName "1.0"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+    implementation 'androidx.appcompat:appcompat:1.6.1'
+    implementation 'com.google.android.material:material:1.9.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    implementation 'androidx.recyclerview:recyclerview:1.3.0'
+    implementation 'androidx.cardview:cardview:1.0.0'
+    implementation 'com.google.code.gson:gson:2.10.1'
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.notetaking.app">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.NoteTaking">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        <activity
+            android:name=".NoteEditorActivity"
+            android:parentActivityName=".MainActivity"
+            android:exported="false" />
+    </application>
+
+</manifest>

app/src/main/java/com/notetaking/app/MainActivity.java

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+package com.notetaking.app;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.TextView;
+import androidx.activity.result.ActivityResultLauncher;
+import androidx.activity.result.contract.ActivityResultContracts;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+import com.google.android.material.floatingactionbutton.FloatingActionButton;
+import java.util.List;
+
+public class MainActivity extends AppCompatActivity implements NotesAdapter.OnNoteClickListener {
+    private RecyclerView recyclerView;
+    private TextView emptyTextView;
+    private NotesAdapter adapter;
+    private NotesManager notesManager;
+    private ActivityResultLauncher<Intent> noteEditorLauncher;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        notesManager = new NotesManager(this);
+
+        recyclerView = findViewById(R.id.recyclerView);
+        emptyTextView = findViewById(R.id.emptyTextView);
+        FloatingActionButton fab = findViewById(R.id.fab);
+
+        recyclerView.setLayoutManager(new LinearLayoutManager(this));
+
+        List<Note> notes = notesManager.loadNotes();
+        adapter = new NotesAdapter(notes, this);
+        recyclerView.setAdapter(adapter);
+
+        updateEmptyView();
+
+        // Register activity result launcher
+        noteEditorLauncher = registerForActivityResult(
+                new ActivityResultContracts.StartActivityForResult(),
+                result -> refreshNotes()
+        );
+
+        fab.setOnClickListener(v -> {
+            Intent intent = new Intent(MainActivity.this, NoteEditorActivity.class);
+            noteEditorLauncher.launch(intent);
+        });
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        refreshNotes();
+    }
+
+    private void refreshNotes() {
+        List<Note> notes = notesManager.loadNotes();
+        adapter.updateNotes(notes);
+        updateEmptyView();
+    }
+
+    private void updateEmptyView() {
+        if (adapter.getItemCount() == 0) {
+            recyclerView.setVisibility(View.GONE);
+            emptyTextView.setVisibility(View.VISIBLE);
+        } else {
+            recyclerView.setVisibility(View.VISIBLE);
+            emptyTextView.setVisibility(View.GONE);
+        }
+    }
+
+    @Override
+    public void onNoteClick(Note note) {
+        Intent intent = new Intent(this, NoteEditorActivity.class);
+        intent.putExtra("note", note);
+        noteEditorLauncher.launch(intent);
+    }
+}

app/src/main/java/com/notetaking/app/Note.java

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+package com.notetaking.app;
+
+import java.io.Serializable;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Locale;
+import java.util.UUID;
+
+public class Note implements Serializable {
+    private String id;
+    private String title;
+    private String content;
+    private long timestamp;
+
+    public Note() {
+        this.id = UUID.randomUUID().toString();
+        this.timestamp = System.currentTimeMillis();
+    }
+
+    public Note(String title, String content) {
+        this();
+        this.title = title;
+        this.content = content;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public void setContent(String content) {
+        this.content = content;
+    }
+
+    public long getTimestamp() {
+        return timestamp;
+    }
+
+    public void setTimestamp(long timestamp) {
+        this.timestamp = timestamp;
+    }
+
+    public String getFormattedDate() {
+        SimpleDateFormat sdf = new SimpleDateFormat("MMM dd, yyyy HH:mm", Locale.getDefault());
+        return sdf.format(new Date(timestamp));
+    }
+}