यह संदर्भ एक सुरक्षित पैरेंटल-कंट्रोल कंपेनियन मचान है: इसके लिए स्पष्ट सहमति की आवश्यकता होती है, यह एक दृश्यमान फ़ोरग्राउंड सूचना का उपयोग करता है, केवल TLS पर कनेक्ट होता है, डिस्कनेक्ट और ऑप्ट-इन बूट स्टार्ट का समर्थन करता है, और एक ऑडिट ट्रेल रिकॉर्ड करता है।

सर्वर URL और टोकन प्रोविजनिंग को बदलें, Socket.IO Android निर्भरता जोड़ें, और परिनियोजन से पहले Android के वर्तमान फोरग्राउंड-सर्विस नियमों की समीक्षा करें। नमूना केवल एक हानिरहित पिंग कमांड स्वीकार करता है।

// MainActivity.kt
package com.example.remotecontrol

import android.Manifest
import android.content.Intent
import android.content.pm.PackageManager
import android.os.Build
import android.os.Bundle
import android.widget.Button
import android.widget.CheckBox
import android.widget.LinearLayout
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import io.socket.client.IO
import io.socket.client.Socket
import org.json.JSONObject

class MainActivity : AppCompatActivity() {
    private lateinit var socket: Socket
    private lateinit var audit: AuditLog
    private lateinit var status: TextView
    private val prefs by lazy { getSharedPreferences("parental_control", MODE_PRIVATE) }
    private val serverUrl = "https://your-domain.example"

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        audit = AuditLog(this)
        setContentView(buildConsentScreen())
    }

    private fun buildConsentScreen(): LinearLayout {
        val root = LinearLayout(this).apply { orientation = LinearLayout.VERTICAL; setPadding(32, 48, 32, 32) }
        val title = TextView(this).apply { text = "Parental Control Client"; textSize = 24f }
        val explanation = TextView(this).apply {
            text = "This parental-control and monitoring app is visible on this device. No monitoring starts until the device user agrees. The safe demo exchanges audit events and ping acknowledgements only."
        }
        val consent = CheckBox(this).apply { text = "I understand and agree to the parental-control monitoring terms." }
        val autoStart = CheckBox(this).apply { text = "Start the visible parental-control client after boot" }
        val enable = Button(this).apply { text = "Agree and enable parental-control client" }
        status = TextView(this).apply { text = "Not connected" }
        val disconnect = Button(this).apply { text = "Disconnect"; isEnabled = false }
        root.addView(title); root.addView(explanation); root.addView(consent); root.addView(autoStart)
        root.addView(enable); root.addView(status); root.addView(disconnect)
        enable.setOnClickListener {
            if (!consent.isChecked) { status.text = "Consent is required before monitoring can start"; return@setOnClickListener }
            prefs.edit().putBoolean("consent", true).putBoolean("auto_start", autoStart.isChecked).apply()
            requestNotificationPermission()
            ContextCompat.startForegroundService(this, Intent(this, ForegroundService::class.java))
            connect()
            disconnect.isEnabled = true
        }
        disconnect.setOnClickListener { disconnect() }
        return root
    }

    private fun requestNotificationPermission() {
        if (Build.VERSION.SDK_INT >= 33 && ContextCompat.checkSelfPermission(this, Manifest.permission.POST_NOTIFICATIONS) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.POST_NOTIFICATIONS), 41)
        }
    }

    private fun connect() {
        if (!prefs.getBoolean("consent", false)) return
        val token = prefs.getString("auth_token", "") ?: ""
        if (token.isBlank()) { status.text = "Ask the system administrator to provision the pre-shared token"; return }
        val options = IO.Options().apply { forceNew = true; reconnection = true; query = "token=$token" }
        socket = IO.socket(serverUrl, options)
        socket.on(Socket.EVENT_CONNECT) { runOnUiThread { status.text = "Connected over TLS/WSS" } }
        socket.on("command") { args ->
            val data = args.firstOrNull() as? JSONObject ?: return@on
            val command = data.optString("command")
            audit.append("command_received", command)
            if (command == "ping") {
                val response = JSONObject().put("type", "ping").put("status", "acknowledged")
                audit.append("data_sent", "ping acknowledgement")
                socket.emit("command_response", response)
            } else {
                audit.append("command_rejected", command)
                socket.emit("command_response", JSONObject().put("type", "error").put("error", "Unsupported command"))
            }
        }
        socket.connect()
        audit.append("session", "connected")
    }

    private fun disconnect() {
        if (::socket.isInitialized) socket.disconnect()
        stopService(Intent(this, ForegroundService::class.java))
        audit.append("session", "disconnected")
        status.text = "Disconnected"
    }

    override fun onDestroy() { if (::socket.isInitialized) socket.disconnect(); super.onDestroy() }
}

private class AuditLog(private val activity: MainActivity) {
    fun append(event: String, detail: String) {
        val line = "${System.currentTimeMillis()}|$event|$detail"
        val old = activity.getSharedPreferences("parental_control_audit", 0).getString("events", "") ?: ""
        activity.getSharedPreferences("parental_control_audit", 0).edit().putString("events", (old + line + "\n").takeLast(100_000)).apply()
    }
}

// ForegroundService.kt
package com.example.remotecontrol

import android.app.Notification
import android.app.NotificationChannel
import android.app.NotificationManager
import android.app.PendingIntent
import android.app.Service
import android.content.Intent
import android.os.Build
import android.os.IBinder
import androidx.core.app.NotificationCompat

class ForegroundService : Service() {
    override fun onCreate() {
        super.onCreate()
        val manager = getSystemService(NotificationManager::class.java)
        if (Build.VERSION.SDK_INT >= 26) manager.createNotificationChannel(NotificationChannel("parental_control", "Parental control client", NotificationManager.IMPORTANCE_LOW))
        val open = PendingIntent.getActivity(this, 0, Intent(this, MainActivity::class.java), PendingIntent.FLAG_IMMUTABLE)
        val notification: Notification = NotificationCompat.Builder(this, "parental_control")
            .setSmallIcon(android.R.drawable.ic_lock_idle_lock)
            .setContentTitle("Parental Control Client is active")
            .setContentText("Monitoring is visible and can be disconnected from the app")
            .setContentIntent(open)
            .setOngoing(true)
            .build()
        startForeground(7, notification)
    }
    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int) = START_NOT_STICKY
    override fun onBind(intent: Intent?): IBinder? = null
}

// DeviceAdminReceiver.kt
package com.example.remotecontrol

import android.app.admin.DeviceAdminReceiver

class DeviceAdminReceiver : DeviceAdminReceiver()

// BootReceiver.kt — only starts after the user enabled the setting.
package com.example.remotecontrol

import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import androidx.core.content.ContextCompat

class BootReceiver : BroadcastReceiver() {
    override fun onReceive(context: Context, intent: Intent) {
        if (intent.action == Intent.ACTION_BOOT_COMPLETED && context.getSharedPreferences("parental_control", 0).getBoolean("auto_start", false) && context.getSharedPreferences("parental_control", 0).getBoolean("consent", false)) {
            ContextCompat.startForegroundService(context, Intent(context, ForegroundService::class.java))
        }
    }
}

// AndroidManifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC" />
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <application android:theme="@style/Theme.AppCompat" android:label="Parental Control Client">
        <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>
        <service android:name=".ForegroundService" android:exported="false" android:foregroundServiceType="dataSync" />
        <receiver android:name=".DeviceAdminReceiver" android:permission="android.permission.BIND_DEVICE_ADMIN" android:exported="true" />
        <receiver android:name=".BootReceiver" android:enabled="true" android:exported="false">
            <intent-filter><action android:name="android.intent.action.BOOT_COMPLETED" /></intent-filter>
        </receiver>
    </application>
</manifest>