Feat: Autofill Service

app/src/main/AndroidManifest.xml

@@ -32,6 +32,7 @@
         <activity android:name=".ui.SettingsActivity" />
         <activity android:name=".ui.AboutUsActivity" />
         <activity android:name=".ui.LicenseActivity" />
+        <activity android:name=".autofill.AutofillSettingsActivity" />
 
         <service
             android:name="androidx.appcompat.app.AppLocalesMetadataHolderService"
@@ -41,6 +42,20 @@
                 android:name="autoStoreLocales"
                 android:value="true" />
         </service>
+
+        <service
+            android:name=".autofill.PasswordAutofillService"
+            android:label="@string/app_name"
+            android:permission="android.permission.BIND_AUTOFILL_SERVICE"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.service.autofill.AutofillService" />
+            </intent-filter>
+
+            <meta-data
+                android:name="android.autofill"
+                android:resource="@xml/autofill_service" />
+        </service>
     </application>
 
 </manifest>

app/src/main/kotlin/com/jeeldobariya/passcodes/autofill/AutofillSettingsActivity.kt

@@ -0,0 +1,23 @@
+package com.jeeldobariya.passcodes.autofill
+
+import android.content.Intent
+import android.os.Bundle
+import android.provider.Settings
+import androidx.appcompat.app.AppCompatActivity
+import com.jeeldobariya.passcodes.R
+import com.google.android.material.button.MaterialButton
+
+class AutofillSettingsActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_autofill_settings)
+
+        val enableAutofillButton = findViewById<MaterialButton>(R.id.enable_autofill_button)
+        enableAutofillButton.setOnClickListener {
+            val intent = Intent(Settings.ACTION_REQUEST_SET_AUTOFILL_SERVICE)
+            intent.data = android.net.Uri.parse("package:$packageName")
+            startActivity(intent)
+        }
+    }
+}

app/src/main/kotlin/com/jeeldobariya/passcodes/autofill/PasswordAutofillService.kt

@@ -0,0 +1,112 @@
+package com.jeeldobariya.passcodes.autofill
+
+import android.app.assist.AssistStructure
+import android.os.CancellationSignal
+import android.service.autofill.AutofillService
+import android.service.autofill.Dataset
+import android.service.autofill.FillCallback
+import android.service.autofill.FillContext
+import android.service.autofill.FillRequest
+import android.service.autofill.FillResponse
+import android.service.autofill.SaveCallback
+import android.service.autofill.SaveRequest
+import android.view.autofill.AutofillValue
+import android.widget.RemoteViews
+import com.jeeldobariya.passcodes.R
+import com.jeeldobariya.passcodes.data.Passcode
+import com.jeeldobariya.passcodes.data.PasscodeDatabase
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.launch
+
+class PasswordAutofillService : AutofillService() {
+
+    private val serviceScope = CoroutineScope(Dispatchers.IO)
+
+    override fun onFillRequest(
+        request: FillRequest,
+        cancellationSignal: CancellationSignal,
+        callback: FillCallback
+    ) {
+        val context = request.fillContexts
+        val structure = context.last().structure
+
+        val viewNodes = mutableMapOf<String, AssistStructure.ViewNode>()
+        parseStructure(structure.getWindowNodeAt(0).rootViewNode, viewNodes)
+
+        val usernameNode = viewNodes["username"] ?: viewNodes["emailAddress"]
+        val passwordNode = viewNodes["password"]
+
+        if (usernameNode?.autofillId == null || passwordNode?.autofillId == null) {
+            callback.onSuccess(null)
+            return
+        }
+
+        val usernameId = usernameNode.autofillId!!
+        val passwordId = passwordNode.autofillId!!
+
+        cancellationSignal.setOnCancelListener {
+            // Handle cancellation
+        }
+
+        serviceScope.launch {
+            val passcodes = PasscodeDatabase.getDatabase(applicationContext).passcodeDao().getAllPasscodes().first()
+            val responseBuilder = FillResponse.Builder()
+
+            for (passcode in passcodes) {
+                val presentation = RemoteViews(packageName, R.layout.autofill_list_item).apply {
+                    setTextViewText(R.id.autofill_username, passcode.name)
+                }
+
+                val dataset = android.service.autofill.Dataset.Builder(presentation)
+                    .setValue(usernameId, AutofillValue.forText(passcode.name))
+                    .setValue(passwordId, AutofillValue.forText(passcode.value))
+                    .build()
+                responseBuilder.addDataset(dataset)
+            }
+
+            callback.onSuccess(responseBuilder.build())
+        }
+    }
+
+    override fun onSaveRequest(request: SaveRequest, callback: SaveCallback) {
+        val context = request.fillContexts
+        val structure = context.last().structure
+
+        val viewNodes = mutableMapOf<String, AssistStructure.ViewNode>()
+        parseStructure(structure.getWindowNodeAt(0).rootViewNode, viewNodes)
+
+        val usernameNode = viewNodes["username"] ?: viewNodes["emailAddress"]
+        val passwordNode = viewNodes["password"]
+
+        val username = usernameNode?.text?.toString()
+        val password = passwordNode?.text?.toString()
+
+        if (!username.isNullOrEmpty() && !password.isNullOrEmpty()) {
+            serviceScope.launch {
+                PasscodeDatabase.getDatabase(applicationContext).passcodeDao().insert(
+                    Passcode(name = username, value = password)
+                )
+            }
+            callback.onSuccess()
+        } else {
+            callback.onFailure("Could not save credentials.")
+        }
+    }
+
+    private fun parseStructure(
+        node: AssistStructure.ViewNode,
+        viewNodes: MutableMap<String, AssistStructure.ViewNode>
+    ) {
+        node.autofillHints?.forEach { hint ->
+            if (!viewNodes.containsKey(hint)) {
+                viewNodes[hint] = node
+            }
+        }
+
+        for (i in 0 until node.childCount) {
+            parseStructure(node.getChildAt(i), viewNodes)
+        }
+    }
+}

app/src/main/kotlin/com/jeeldobariya/passcodes/data/Passcode.kt

@@ -0,0 +1,12 @@
+package com.jeeldobariya.passcodes.data
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "passcodes")
+data class Passcode(
+    @PrimaryKey(autoGenerate = true)
+    val id: Int = 0,
+    val name: String,
+    val value: String
+)

app/src/main/kotlin/com/jeeldobariya/passcodes/data/PasscodeDao.kt

@@ -0,0 +1,28 @@
+package com.jeeldobariya.passcodes.data
+
+import androidx.room.Dao
+import androidx.room.Delete
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import androidx.room.Update
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface PasscodeDao {
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insert(passcode: Passcode)
+
+    @Update
+    suspend fun update(passcode: Passcode)
+
+    @Delete
+    suspend fun delete(passcode: Passcode)
+
+    @Query("SELECT * FROM passcodes ORDER BY name ASC")
+    fun getAllPasscodes(): Flow<List<Passcode>>
+
+    @Query("SELECT * FROM passcodes WHERE id = :id")
+    fun getPasscode(id: Int): Flow<Passcode>
+}

app/src/main/kotlin/com/jeeldobariya/passcodes/data/PasscodeDatabase.kt

@@ -0,0 +1,29 @@
+package com.jeeldobariya.passcodes.data
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+
+@Database(entities = [Passcode::class], version = 1, exportSchema = false)
+abstract class PasscodeDatabase : RoomDatabase() {
+
+    abstract fun passcodeDao(): PasscodeDao
+
+    companion object {
+        @Volatile
+        private var INSTANCE: PasscodeDatabase? = null
+
+        fun getDatabase(context: Context): PasscodeDatabase {
+            return INSTANCE ?: synchronized(this) {
+                val instance = Room.databaseBuilder(
+                    context.applicationContext,
+                    PasscodeDatabase::class.java,
+                    "passcode_database"
+                ).build()
+                INSTANCE = instance
+                instance
+            }
+        }
+    }
+}

app/src/main/res/layout/activity_autofill_settings.xml

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:gravity="center"
+    android:orientation="vertical"
+    android:padding="16dp">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Enable Passcodes Autofill"
+        android:textAppearance="@style/TextAppearance.Material3.TitleLarge" />
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        android:text="To use Passcodes as your password manager, you need to enable it as an autofill service in your device settings."
+        android:textAlignment="center" />
+
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/enable_autofill_button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="24dp"
+        android:text="Open Settings" />
+
+</LinearLayout>

app/src/main/res/layout/activity_main.xml

@@ -11,7 +11,7 @@
         android:layout_width="128dp"
         android:layout_height="128dp"
         android:background="@drawable/ic_passodes"
-        android:contentDescription="Passcodes Logo" />
+        android:contentDescription="@string/passcodes_logo" />
 
     <LinearLayout
         android:layout_width="wrap_content"
@@ -20,15 +20,15 @@
         android:orientation="vertical"
         android:layout_margin="16sp">
 
-        <com.google.android.material.textview.MaterialTextView 
+        <com.google.android.material.textview.MaterialTextView
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_margin="4dp"
             android:text="@string/app_name"
             android:textAlignment="center"
             android:textSize="32dp" />
-            
-        <com.google.android.material.textview.MaterialTextView 
+
+        <com.google.android.material.textview.MaterialTextView
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_margin="4dp"
@@ -50,7 +50,7 @@
             android:layout_height="wrap_content"
             android:text="@string/password_manager_button_text"
             android:textSize="14dp" />
-        
+
         <com.google.android.material.button.MaterialButton
             android:id="@+id/setting_btn"
             style="@style/Widget.Material3.Button.OutlinedButton"

app/src/main/res/layout/autofill_list_item.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:padding="8dp">
+
+    <TextView
+        android:id="@+id/autofill_username"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:textStyle="bold" />
+
+</LinearLayout>

app/src/main/res/values/strings.xml

@@ -98,4 +98,5 @@
     <string name="danger_copy_to_clipboard_desc">Copying sensitive data like passwords to clipboard is not so good for security!!!</string>
     <string name="confirm_dialog_button_text">Confirm</string>
     <string name="discard_dialog_button_text">Discard</string>
+    <string name="passcodes_logo">Passcodes Logo</string>
 </resources>

app/src/main/res/xml/autofill_service.xml

@@ -0,0 +1,4 @@
+<autofill-service
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:settingsActivity="com.jeeldobariya.passcodes.autofill.AutofillSettingsActivity" />
+

gradle/libs.versions.toml

@@ -14,7 +14,7 @@ coroutines = "1.10.2"
 lifecycle = "2.9.2"
 
 # Plugin versions
-agp = "8.11.0"
+agp = "8.13.0"
 kotlin-plugin = "2.1.21"
 ksp = "2.1.21-2.0.2"
 oss-license-plugin = "0.10.6" # latest safe version for oss-licenses-plugin