comments added with description

app/src/main/java/com/harpreet/notes_app/HomeActivity.java

@@ -39,7 +39,10 @@ public class HomeActivity extends AppCompatActivity {
     private FloatingActionButton fab;
     private RecyclerView recyclerView;
 
-    private FirebaseRecyclerAdapter<Data,Myviewholder> adapter;
+    private FirebaseRecyclerAdapter<Data,Myviewholder> adapter;    //These lines declare various variables used within the HomeActivity class, including references to UI
+                                                                    // elements (toolbar, floating action button, and recycler view), an adapter for
+                                                                    // the recycler view, instances of Firebase-related classes (FirebaseAuth and DatabaseReference),
+                                                                    // and other variables to store data.
     private FirebaseAuth mauth;
     private DatabaseReference mDatabase;
 
@@ -80,7 +83,7 @@ public void onClick(View v) {
 
 
     }
-    private void addData()
+    private void addData()             //This method is responsible for displaying an AlertDialog that allows the user to input data (name and description) for a new note.
     {
         AlertDialog.Builder mydialog = new AlertDialog.Builder(this);
         LayoutInflater inflater = LayoutInflater.from(this);
@@ -134,7 +137,7 @@ public void onClick(View v) {
 
 
     @Override
-    protected void onStart() {
+    protected void onStart() {  //It sets up the FirebaseRecyclerAdapter for displaying the notes in the RecyclerView and starts listening for changes in the data.
         super.onStart();
 
         Query query = FirebaseDatabase.getInstance().getReference().child("All data").child(mauth.getUid());
@@ -181,13 +184,15 @@ public void onClick(View v) {
     }
 
     @Override
-    protected void onStop() {
+    protected void onStop() {  //This method is called when the activity is stopped. It stops the FirebaseRecyclerAdapter from listening to changes in the data.
         super.onStop();
         adapter.stopListening();
 
     }
 
-    public static  class Myviewholder extends RecyclerView.ViewHolder{
+    public static  class Myviewholder extends RecyclerView.ViewHolder{          //This is a static inner class that defines a
+                                                                // custom RecyclerView.ViewHolder for the notes. It holds references
+                                                                 //   to the UI elements within each item of the RecyclerView.
 
         View mView;
 
@@ -213,7 +218,9 @@ public void setDate(String date)
 
     }
 
-    public void updateData()
+    public void updateData() //
+   // The updateData() method is responsible for displaying an AlertDialog that allows the user to update the
+    // selected note's data or delete the note. Here's a breakdown of what the method does:
 
     {
 

app/src/main/java/com/harpreet/notes_app/MainActivity.java

@@ -26,13 +26,17 @@ public class MainActivity extends AppCompatActivity {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+        // Initialize views
         email = findViewById(R.id.email);
         password = findViewById(R.id.password);
         btnsignin = findViewById(R.id.signin);
         btnsignup = findViewById(R.id.signup);
+        // Initialize FirebaseAuth instance
         mAuth = FirebaseAuth.getInstance();
+        // Initialize ProgressDialog
         progressd = new ProgressDialog(MainActivity.this);
 
+        // Check if the user is already signed in, if yes, redirect to HomeActivity
         if (mAuth.getCurrentUser()!=null)
         {
             startActivity(new Intent(getApplicationContext(),HomeActivity.class));
@@ -58,6 +62,7 @@ public void onClick(View v) {
 
                         progressd.setMessage("Processing");
                         progressd.show();
+                        // Sign in with email and password using FirebaseAuth
                         mAuth.signInWithEmailAndPassword(mEmail,mPass).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                             @Override
                             public void onComplete(@NonNull Task<AuthResult> task) {
@@ -76,7 +81,7 @@ public void onComplete(@NonNull Task<AuthResult> task) {
 
                     }
                 });
-
+        // Set click listener for sign-up button
         btnsignup.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {

app/src/main/java/com/harpreet/notes_app/RegistrationActivity.java

@@ -45,6 +45,7 @@ public void onClick(View v) {
             }
         });
 */
+        // Set click listener for sign-up button
         signup.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
@@ -61,6 +62,8 @@ public void onClick(View v) {
                     pass.setError("RequiredField..");
                     return;
                 }
+                // Show progress dialog while processing sign-up request
+
                 pddia.setMessage("Processing");
                 pddia.show();
                 mAuth.createUserWithEmailAndPassword(mEmail,mPass).addOnCompleteListener(new OnCompleteListener<AuthResult>() {