buildscript { repositories { google() mavenCentral() } dependencies { classpath "com.android.tools.build:gradle:8.1.1" classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.10" } } allprojects { repositories { google() mavenCentral() } } rootProject.name = "BillBook" include ':app' plugins { id 'com.android.application' id 'org.jetbrains.kotlin.android' id 'kotlin-kapt' } android { namespace 'com.example.billbook' compileSdk 33 defaultConfig { applicationId "com.example.billbook" minSdk 21 targetSdk 33 versionCode 1 versionName "1.0" testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' } } compileOptions { sourceCompatibility JavaVersion.VERSION_17 targetCompatibility JavaVersion.VERSION_17 } kotlinOptions { jvmTarget = "17" } } dependencies { implementation "org.jetbrains.kotlin:kotlin-stdlib:1.9.10" // AndroidX implementation 'androidx.core:core-ktx:1.12.0' 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' // Room implementation "androidx.room:room-runtime:2.6.1" kapt "androidx.room:room-compiler:2.6.1" implementation "androidx.room:room-ktx:2.6.1" // Lifecycle & LiveData implementation "androidx.lifecycle:lifecycle-runtime-ktx:2.6.2" implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.6.2" implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.6.2" // Gson for type converters implementation 'com.google.code.gson:gson:2.10.1' // Coroutines implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3" // PDF generation uses android graphics; no extra lib testImplementation 'junit:junit:4.13.2' androidTestImplementation 'androidx.test.ext:junit:1.1.5' androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1' }

package com.example.billbook.data import androidx.room.Entity import androidx.room.PrimaryKey @Entity(tableName = "bills") data class BillEntity( @PrimaryKey(autoGenerate = true) val id: Long = 0, val billNumber: Int, val partyName: String, val dateMillis: Long, val items: List, val grandTotal: Double ) data class Item( val serialNo: Int, val details: String, val rate: Double, val rupees: Double ) package com.example.billbook.data import androidx.room.TypeConverter import com.google.gson.Gson import com.google.gson.reflect.TypeToken class Converters { private val gson = Gson() @TypeConverter fun fromItems(items: List?): String { if (items == null) return "[]" return gson.toJson(items) } @TypeConverter fun toItems(data: String?): List { if (data.isNullOrEmpty()) return emptyList() val listType = object : TypeToken>() {}.type return gson.fromJson(data, listType) } } package com.example.billbook.data import androidx.lifecycle.LiveData import androidx.room.* @Dao interface BillDao { @Insert(onConflict = OnConflictStrategy.REPLACE) suspend fun insert(bill: BillEntity): Long @Update suspend fun update(bill: BillEntity) @Delete suspend fun delete(bill: BillEntity) @Query("SELECT * FROM bills ORDER BY billNumber DESC") fun getAllBills(): LiveData> @Query("SELECT * FROM bills WHERE id = :id") suspend fun getBillById(id: Long): BillEntity? @Query("SELECT MAX(billNumber) FROM bills") suspend fun getMaxBillNumber(): Int? @Query("SELECT SUM(grandTotal) FROM bills") fun getTotalOfAllBills(): LiveData } package com.example.billbook.data import android.content.Context import androidx.room.Database import androidx.room.Room import androidx.room.RoomDatabase import androidx.room.TypeConverters @Database(entities = [BillEntity::class], version = 1, exportSchema = false) @TypeConverters(Converters::class) abstract class AppDatabase : RoomDatabase() { abstract fun billDao(): BillDao companion object { @Volatile private var INSTANCE: AppDatabase? = null fun getInstance(context: Context): AppDatabase { return INSTANCE ?: synchronized(this) { val instance = Room.databaseBuilder( context.applicationContext, AppDatabase::class.java, "billbook_db" ).fallbackToDestructiveMigration() .build() INSTANCE = instance instance } } } } package com.example.billbook.ui.adapter import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import android.widget.TextView import androidx.recyclerview.widget.RecyclerView import com.example.billbook.R import com.example.billbook.data.BillEntity import java.text.SimpleDateFormat import java.util.* class BillAdapter( private var items: MutableList, private val listener: (BillEntity) -> Unit ) : RecyclerView.Adapter() { private val dateFormat = SimpleDateFormat("dd/MM/yyyy", Locale.getDefault()) override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BillViewHolder { val view = LayoutInflater.from(parent.context).inflate(R.layout.item_bill_row, parent, false) return BillViewHolder(view) } override fun onBindViewHolder(holder: BillViewHolder, position: Int) { val bill = items[position] holder.bind(bill) holder.itemView.setOnClickListener { listener(bill) } } override fun getItemCount(): Int = items.size fun setData(newItems: List) { items = newItems.toMutableList() notifyDataSetChanged() } fun filter(predicate: (BillEntity) -> Boolean) { val filtered = items.filter(predicate) items = filtered.toMutableList() notifyDataSetChanged() } inner class BillViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) { private val tvBillNo: TextView = itemView.findViewById(R.id.tvBillNumber) private val tvParty: TextView = itemView.findViewById(R.id.tvPartyName) private val tvDate: TextView = itemView.findViewById(R.id.tvDate) private val tvTotal: TextView = itemView.findViewById(R.id.tvGrandTotal) fun bind(bill: BillEntity) { tvBillNo.text = "Bill No: ${bill.billNumber}" tvParty.text = bill.partyName tvDate.text = dateFormat.format(Date(bill.dateMillis)) tvTotal.text = "₹ ${String.format(Locale.getDefault(), "%.2f", bill.grandTotal)}" } } } package com.example.billbook.ui.adapter import android.text.Editable import android.text.TextWatcher import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import android.widget.EditText import android.widget.TextView import androidx.recyclerview.widget.RecyclerView import com.example.billbook.R import com.example.billbook.data.Item import java.util.* class ItemsAdapter( private val editable: Boolean, private val items: MutableList = mutableListOf(), private val onItemsChanged: (List) -> Unit = {} ) : RecyclerView.Adapter() { fun setItems(newItems: List) { items.clear() items.addAll(newItems) notifyDataSetChanged() } fun addEmptyItem() { val nextSerial = items.size + 1 items.add(Item(nextSerial, "", 0.0, 0.0)) notifyItemInserted(items.size - 1) onItemsChanged(items) } override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ItemViewHolder { val view = LayoutInflater.from(parent.context).inflate(R.layout.item_bill_item_row, parent, false) return ItemViewHolder(view) } override fun getItemCount(): Int = items.size override fun onBindViewHolder(holder: ItemViewHolder, position: Int) { holder.bind(items[position], position) } inner class ItemViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) { private val tvSerial: TextView = itemView.findViewById(R.id.tvSerial) private val etDetails: EditText = itemView.findViewById(R.id.etDetails) private val etRate: EditText = itemView.findViewById(R.id.etRate) private val tvRupees: TextView = itemView.findViewById(R.id.tvRupees) fun bind(item: Item, position: Int) { tvSerial.text = item.serialNo.toString() if (editable) { etDetails.isEnabled = true etRate.isEnabled = true } else { etDetails.isEnabled = false etRate.isEnabled = false } etDetails.setText(item.details) etRate.setText(if (item.rate == 0.0) "" else item.rate.toString()) tvRupees.text = String.format(Locale.getDefault(), "%.2f", item.rupees) etDetails.addTextChangedListener(object : TextWatcher { override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {} override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {} override fun afterTextChanged(s: Editable?) { items[adapterPosition] = items[adapterPosition].copy(details = s.toString()) onItemsChanged(items) } }) etRate.addTextChangedListener(object : TextWatcher { override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {} override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {} override fun afterTextChanged(s: Editable?) { val rate = s.toString().toDoubleOrNull() ?: 0.0 val rupees = rate // assuming quantity 1 items[adapterPosition] = items[adapterPosition].copy(rate = rate, rupees = rupees) tvRupees.text = String.format(Locale.getDefault(), "%.2f", rupees) onItemsChanged(items) } }) } } } package com.example.billbook.ui import android.content.Intent import android.os.Bundle import android.text.Editable import android.text.TextWatcher import android.widget.EditText import android.widget.TextView import androidx.appcompat.app.AppCompatActivity import androidx.lifecycle.Observer import androidx.lifecycle.lifecycleScope import androidx.recyclerview.widget.LinearLayoutManager import androidx.recyclerview.widget.RecyclerView import com.example.billbook.R import com.example.billbook.data.AppDatabase import com.example.billbook.data.BillEntity import com.example.billbook.ui.adapter.BillAdapter import com.google.android.material.floatingactionbutton.FloatingActionButton import kotlinx.coroutines.Dispatchers import kotlinx.coroutines.launch import java.util.* class MainActivity : AppCompatActivity() { private lateinit var db: AppDatabase private lateinit var tvTotalAll: TextView private lateinit var rvBills: RecyclerView private lateinit var etSearch: EditText private lateinit var fab: FloatingActionButton private lateinit var adapter: BillAdapter private var allBillsList: List = emptyList() override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) db = AppDatabase.getInstance(applicationContext) tvTotalAll = findViewById(R.id.tvTotalAll) rvBills = findViewById(R.id.rvBills) etSearch = findViewById(R.id.etSearch) fab = findViewById(R.id.fabAdd) adapter = BillAdapter(mutableListOf()) { bill -> val intent = Intent(this, BillDetailActivity::class.java) intent.putExtra("bill_id", bill.id) startActivity(intent) } rvBills.layoutManager = LinearLayoutManager(this) rvBills.adapter = adapter // Observe total of all bills db.billDao().getTotalOfAllBills().observe(this, Observer { total -> val t = total ?: 0.0 tvTotalAll.text = "Total of All Bills: ${String.format(Locale.getDefault(), "%.2f", t)} Rupees" }) db.billDao().getAllBills().observe(this, Observer { bills -> allBillsList = bills adapter.setData(bills) }) etSearch.addTextChangedListener(object : TextWatcher { override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {} override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) { filter(s.toString()) } override fun afterTextChanged(s: Editable?) {} }) fab.setOnClickListener { val intent = Intent(this, BillFormActivity::class.java) startActivity(intent) } } private fun filter(query: String) { if (query.isBlank()) { adapter.setData(allBillsList) return } val qLower = query.lowercase(Locale.getDefault()) val filtered = allBillsList.filter { it.partyName.lowercase(Locale.getDefault()).contains(qLower) || it.billNumber.toString().contains(qLower) } adapter.setData(filtered) } } package com.example.billbook.ui import android.app.DatePickerDialog import android.os.Bundle import android.view.View import android.widget.* import androidx.appcompat.app.AppCompatActivity import androidx.lifecycle.lifecycleScope import androidx.recyclerview.widget.LinearLayoutManager import androidx.recyclerview.widget.RecyclerView import com.example.billbook.R import com.example.billbook.data.AppDatabase import com.example.billbook.data.BillEntity import com.example.billbook.data.Item import com.example.billbook.ui.adapter.ItemsAdapter import com.google.android.material.floatingactionbutton.FloatingActionButton import kotlinx.coroutines.Dispatchers import kotlinx.coroutines.launch import java.util.* class BillFormActivity : AppCompatActivity() { private lateinit var etPartyName: EditText private lateinit var tvBillNo: TextView private lateinit var btnPickDate: Button private lateinit var rvItems: RecyclerView private lateinit var tvGrandTotal: TextView private lateinit var btnAddItem: Button private lateinit var btnSave: Button private lateinit var fabBack: FloatingActionButton private lateinit var db: AppDatabase private lateinit var itemsAdapter: ItemsAdapter private var billIdToEdit: Long? = null private var selectedDateMillis: Long = System.currentTimeMillis() private var billNumber: Int = 3195 override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_bill_form) etPartyName = findViewById(R.id.etPartyName) tvBillNo = findViewById(R.id.tvBillNo) btnPickDate = findViewById(R.id.btnPickDate) rvItems = findViewById(R.id.rvItems) tvGrandTotal = findViewById(R.id.tvGrandTotal) btnAddItem = findViewById(R.id.btnAddItem) btnSave = findViewById(R.id.btnSave) fabBack = findViewById(R.id.fabBack) db = AppDatabase.getInstance(applicationContext) itemsAdapter = ItemsAdapter(true, mutableListOf()) { updatedItems -> calculateGrandTotal(updatedItems) } rvItems.layoutManager = LinearLayoutManager(this) rvItems.adapter = itemsAdapter fabBack.setOnClickListener { finish() } btnAddItem.setOnClickListener { itemsAdapter.addEmptyItem() } btnPickDate.setOnClickListener { showDatePicker() } btnSave.setOnClickListener { saveBill() } // Check if editing existing bill billIdToEdit = intent.getLongExtra("bill_id", -1).takeIf { it != -1L } lifecycleScope.launch(Dispatchers.IO) { val max = db.billDao().getMaxBillNumber() ?: 3194 if (billIdToEdit == null) { billNumber = max + 1 runOnUiThread { tvBillNo.text = "Bill No: $billNumber" } } else { val bill = db.billDao().getBillById(billIdToEdit!!) if (bill != null) { billNumber = bill.billNumber selectedDateMillis = bill.dateMillis runOnUiThread { tvBillNo.text = "Bill No: $billNumber" etPartyName.setText(bill.partyName) btnPickDate.text = android.text.format.DateFormat.format("dd/MM/yyyy", Date(selectedDateMillis)) itemsAdapter.setItems(bill.items.toMutableList()) calculateGrandTotal(bill.items) } } } } } private fun showDatePicker() { val cal = Calendar.getInstance() cal.timeInMillis = selectedDateMillis val dpd = DatePickerDialog(this, { _, year, month, dayOfMonth -> val c = Calendar.getInstance() c.set(year, month, dayOfMonth, 0, 0, 0) selectedDateMillis = c.timeInMillis btnPickDate.text = android.text.format.DateFormat.format("dd/MM/yyyy", Date(selectedDateMillis)) }, cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH)) dpd.show() } private fun calculateGrandTotal(items: List) { val total = items.sumOf { it.rupees } tvGrandTotal.text = "Grand Total: ₹ ${String.format(Locale.getDefault(), "%.2f", total)}" } private fun saveBill() { val party = etPartyName.text.toString().trim() if (party.isEmpty()) { Toast.makeText(this, "Enter party name", Toast.LENGTH_SHORT).show() return } val items = (0 until itemsAdapter.itemCount).map { index -> val it = itemsAdapter.run { // Access internal list via reflection of adapter (not ideal), but ItemsAdapter exposes onItemsChanged // To keep simple, we'll reconstruct from adapter by reading view holders null } null } // Instead of reading view holders, keep a local reference by using onItemsChanged earlier. // To simplify, adapt ItemsAdapter to keep internal list. Here simply get it using adapter internal field via method setItems/get will be added implicitly // We'll modify ItemsAdapter class to provide method getCurrentItems. But we didn't. To avoid mismatch, we can maintain current items via callback set in adapter that updates a local var. // Simpler: we'll add a small workaround: supply onItemsChanged when creating adapter to track items. } } package com.example.billbook.ui import android.app.DatePickerDialog import android.os.Bundle import android.view.View import android.widget.* import androidx.appcompat.app.AppCompatActivity import androidx.lifecycle.lifecycleScope import androidx.recyclerview.widget.LinearLayoutManager import androidx.recyclerview.widget.RecyclerView import com.example.billbook.R import com.example.billbook.data.AppDatabase import com.example.billbook.data.BillEntity import com.example.billbook.data.Item import com.example.billbook.ui.adapter.ItemsAdapter import com.google.android.material.floatingactionbutton.FloatingActionButton import kotlinx.coroutines.Dispatchers import kotlinx.coroutines.launch import java.util.* class BillFormActivity : AppCompatActivity() { private lateinit var etPartyName: EditText private lateinit var tvBillNo: TextView private lateinit var btnPickDate: Button private lateinit var rvItems: RecyclerView private lateinit var tvGrandTotal: TextView private lateinit var btnAddItem: Button private lateinit var btnSave: Button private lateinit var fabBack: FloatingActionButton private lateinit var db: AppDatabase private lateinit var itemsAdapter: ItemsAdapter private var currentItems: MutableList = mutableListOf() private var billIdToEdit: Long? = null private var selectedDateMillis: Long = System.currentTimeMillis() private var billNumber: Int = 3195 override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_bill_form) etPartyName = findViewById(R.id.etPartyName) tvBillNo = findViewById(R.id.tvBillNo) btnPickDate = findViewById(R.id.btnPickDate) rvItems = findViewById(R.id.rvItems) tvGrandTotal = findViewById(R.id.tvGrandTotal) btnAddItem = findViewById(R.id.btnAddItem) btnSave = findViewById(R.id.btnSave) fabBack = findViewById(R.id.fabBack) db = AppDatabase.getInstance(applicationContext) itemsAdapter = ItemsAdapter(true, mutableListOf()) { updatedItems -> currentItems = updatedItems.toMutableList() calculateGrandTotal(updatedItems) } rvItems.layoutManager = LinearLayoutManager(this) rvItems.adapter = itemsAdapter fabBack.setOnClickListener { finish() } btnAddItem.setOnClickListener { itemsAdapter.addEmptyItem() } btnPickDate.setOnClickListener { showDatePicker() } btnSave.setOnClickListener { saveBill() } // Check if editing existing bill billIdToEdit = intent.getLongExtra("bill_id", -1).takeIf { it != -1L } lifecycleScope.launch(Dispatchers.IO) { val max = db.billDao().getMaxBillNumber() ?: 3194 if (billIdToEdit == null) { billNumber = max + 1 runOnUiThread { tvBillNo.text = "Bill No: $billNumber" btnPickDate.text = android.text.format.DateFormat.format("dd/MM/yyyy", Date(selectedDateMillis)) } } else { val bill = db.billDao().getBillById(billIdToEdit!!) if (bill != null) { billNumber = bill.billNumber selectedDateMillis = bill.dateMillis runOnUiThread { tvBillNo.text = "Bill No: $billNumber" etPartyName.setText(bill.partyName) btnPickDate.text = android.text.format.DateFormat.format("dd/MM/yyyy", Date(selectedDateMillis)) itemsAdapter.setItems(bill.items.toMutableList()) currentItems = bill.items.toMutableList() calculateGrandTotal(bill.items) } } } } } private fun showDatePicker() { val cal = Calendar.getInstance() cal.timeInMillis = selectedDateMillis val dpd = DatePickerDialog(this, { _, year, month, dayOfMonth -> val c = Calendar.getInstance() c.set(year, month, dayOfMonth, 0, 0, 0) selectedDateMillis = c.timeInMillis btnPickDate.text = android.text.format.DateFormat.format("dd/MM/yyyy", Date(selectedDateMillis)) }, cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH)) dpd.show() } private fun calculateGrandTotal(items: List) { val total = items.sumOf { it.rupees } tvGrandTotal.text = "Grand Total: ₹ ${String.format(Locale.getDefault(), "%.2f", total)}" } private fun saveBill() { val party = etPartyName.text.toString().trim() if (party.isEmpty()) { Toast.makeText(this, "Enter party name", Toast.LENGTH_SHORT).show() return } if (currentItems.isEmpty()) { Toast.makeText(this, "Add at least one item.", Toast.LENGTH_SHORT).show() return } // Ensure serial numbers are consistent val finalizedItems = currentItems.mapIndexed { idx, it -> it.copy(serialNo = idx + 1) } val grandTotal = finalizedItems.sumOf { it.rupees } val bill = BillEntity( id = billIdToEdit ?: 0, billNumber = billNumber, partyName = party, dateMillis = selectedDateMillis, items = finalizedItems, grandTotal = grandTotal ) lifecycleScope.launch(Dispatchers.IO) { if (billIdToEdit == null) { db.billDao().insert(bill) } else { db.billDao().update(bill) } runOnUiThread { Toast.makeText(this@BillFormActivity, "Saved", Toast.LENGTH_SHORT).show() finish() } } } } package com.example.billbook.ui import android.Manifest import android.content.Intent import android.content.pm.PackageManager import android.graphics.Canvas import android.graphics.Paint import android.graphics.pdf.PdfDocument import android.os.Build import android.os.Bundle import android.os.Environment import android.view.View import android.widget.Button import android.widget.TextView import android.widget.Toast import androidx.appcompat.app.AlertDialog import androidx.appcompat.app.AppCompatActivity import androidx.core.app.ActivityCompat import androidx.lifecycle.lifecycleScope import androidx.recyclerview.widget.LinearLayoutManager import androidx.recyclerview.widget.RecyclerView import com.example.billbook.R import com.example.billbook.data.AppDatabase import com.example.billbook.data.BillEntity import com.example.billbook.ui.adapter.ItemsAdapter import com.google.android.material.floatingactionbutton.FloatingActionButton import kotlinx.coroutines.Dispatchers import kotlinx.coroutines.launch import java.io.File import java.io.FileOutputStream import java.text.SimpleDateFormat import java.util.* class BillDetailActivity : AppCompatActivity() { private lateinit var db: AppDatabase private var billId: Long = -1 private var bill: BillEntity? = null private lateinit var tvBillNo: TextView private lateinit var tvParty: TextView private lateinit var tvDate: TextView private lateinit var rvItems: RecyclerView private lateinit var tvGrandTotal: TextView private lateinit var btnEdit: Button private lateinit var btnDelete: Button private lateinit var btnExport: Button private lateinit var fabBack: FloatingActionButton private lateinit var itemsAdapter: ItemsAdapter override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_bill_detail) tvBillNo = findViewById(R.id.tvBillNoDetail) tvParty = findViewById(R.id.tvPartyDetail) tvDate = findViewById(R.id.tvDateDetail) rvItems = findViewById(R.id.rvItemsDetail) tvGrandTotal = findViewById(R.id.tvGrandTotalDetail) btnEdit = findViewById(R.id.btnEdit) btnDelete = findViewById(R.id.btnDelete) btnExport = findViewById(R.id.btnExport) fabBack = findViewById(R.id.fabBackDetail) db = AppDatabase.getInstance(applicationContext) itemsAdapter = ItemsAdapter(false, mutableListOf()) rvItems.layoutManager = LinearLayoutManager(this) rvItems.adapter = itemsAdapter billId = intent.getLongExtra("bill_id", -1) fabBack.setOnClickListener { finish() } btnEdit.setOnClickListener { val intent = Intent(this, BillFormActivity::class.java) intent.putExtra("bill_id", billId) startActivity(intent) } btnDelete.setOnClickListener { confirmDelete() } btnExport.setOnClickListener { if (checkAndRequestPermissions()) { exportPdf() } } } override fun onResume() { super.onResume() loadBill() } private fun loadBill() { lifecycleScope.launch(Dispatchers.IO) { val b = db.billDao().getBillById(billId) bill = b runOnUiThread { if (b == null) { Toast.makeText(this@BillDetailActivity, "Bill not found", Toast.LENGTH_SHORT).show() finish() return@runOnUiThread } val fmt = SimpleDateFormat("dd/MM/yyyy", Locale.getDefault()) tvBillNo.text = "Bill No: ${b.billNumber}" tvParty.text = b.partyName tvDate.text = fmt.format(Date(b.dateMillis)) itemsAdapter.setItems(b.items.toMutableList()) tvGrandTotal.text = "Grand Total: ₹ ${String.format(Locale.getDefault(), "%.2f", b.grandTotal)}" } } } private fun confirmDelete() { AlertDialog.Builder(this) .setTitle("Delete") .setMessage("Delete this bill?") .setPositiveButton("Yes") { _, _ -> lifecycleScope.launch(Dispatchers.IO) { bill?.let { db.billDao().delete(it) } runOnUiThread { Toast.makeText(this@BillDetailActivity, "Deleted", Toast.LENGTH_SHORT).show() finish() } } } .setNegativeButton("No", null) .show() } private fun checkAndRequestPermissions(): Boolean { if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) { val write = ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) val read = ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) val needed = mutableListOf() if (write != PackageManager.PERMISSION_GRANTED) needed.add(Manifest.permission.WRITE_EXTERNAL_STORAGE) if (read != PackageManager.PERMISSION_GRANTED) needed.add(Manifest.permission.READ_EXTERNAL_STORAGE) return if (needed.isNotEmpty()) { ActivityCompat.requestPermissions(this, needed.toTypedArray(), 1001) false } else { true } } return true } private fun exportPdf() { val b = bill ?: return val pageWidth = 595 val pageHeight = 842 val document = PdfDocument() val pageInfo = PdfDocument.PageInfo.Builder(pageWidth, pageHeight, 1).create() val page = document.startPage(pageInfo) val canvas: Canvas = page.canvas val paint = Paint() paint.textSize = 12f var y = 30f paint.textSize = 16f paint.isFakeBoldText = true canvas.drawText("BillBook", 20f, y, paint) paint.isFakeBoldText = false paint.textSize = 12f y += 30f canvas.drawText("Bill No: ${b.billNumber}", 20f, y, paint) canvas.drawText("Date: ${android.text.format.DateFormat.format("dd/MM/yyyy", Date(b.dateMillis))}", 300f, y, paint) y += 20f canvas.drawText("Party: ${b.partyName}", 20f, y, paint) y += 25f // Header for items paint.isFakeBoldText = true canvas.drawText("S.No", 20f, y, paint) canvas.drawText("Details", 70f, y, paint) canvas.drawText("Rate", 380f, y, paint) canvas.drawText("Rupees", 480f, y, paint) paint.isFakeBoldText = false y += 15f canvas.drawLine(20f, y, pageWidth - 20f, y, paint) y += 10f for (item in b.items) { if (y > pageHeight - 100) { // single page only requirement; break if overflow break } canvas.drawText(item.serialNo.toString(), 20f, y, paint) val details = if (item.details.length > 60) item.details.substring(0, 60) + "..." else item.details canvas.drawText(details, 70f, y, paint) canvas.drawText(String.format(Locale.getDefault(), "%.2f", item.rate), 380f, y, paint) canvas.drawText(String.format(Locale.getDefault(), "%.2f", item.rupees), 480f, y, paint) y += 18f } y = pageHeight - 120f paint.isFakeBoldText = true canvas.drawText("Grand Total: ₹ ${String.format(Locale.getDefault(), "%.2f", b.grandTotal)}", 300f, y, paint) y += 40f paint.isFakeBoldText = false canvas.drawText("Signature: ____________________", 20f, y, paint) document.finishPage(page) try { val dir = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) { File(getExternalFilesDir(null), "BillBook") } else { File(Environment.getExternalStorageDirectory(), "BillBook") } if (!dir.exists()) dir.mkdirs() val file = File(dir, "Bill_${b.billNumber}.pdf") val fos = FileOutputStream(file) document.writeTo(fos) document.close() fos.close() Toast.makeText(this, "PDF exported: ${file.absolutePath}", Toast.LENGTH_LONG).show() } catch (e: Exception) { e.printStackTrace() Toast.makeText(this, "Error exporting PDF: ${e.message}", Toast.LENGTH_LONG).show() } } }