Mobile_Application_Development_Weeks_4-6.pptx

Week 4: System Services & Permissions
GSM Services
Sending SMS messages using SmsManager API
Making phone calls programmatically
Handling GSM-related permissions
Email Services
Sending emails via system intents
Composing email with attachments
Integration with device email clients
Permissions System
Manifest permissions declaration
Run-time permissions (Android 6.0+)
Permission request handling and validation

GSM Services: SMS and Phone Calls
Sending Messages and Making Calls Programmatically
Sending SMS with SmsManager
val smsManager = SmsManager.getDefault()
val phoneNumber = "+1234567890"
val message = "Hello from Android!"
smsManager.sendTextMessage(
phoneNumber,
null,
message,
null,
null
)
Toast.makeText(
this,
"SMS sent!",
Toast.LENGTH_SHORT
).show()
Making Phone Calls
val phoneNumber = "+1234567890"
val intent = Intent(
Intent.ACTION_CALL,
Uri.parse(
"tel:$phoneNumber"
)
)
if (ActivityCompat.
checkSelfPermission(
this,
Manifest.permission.
CALL_PHONE
) == PackageManager.
PERMISSION_GRANTED
) {
startActivity(intent)
}
Required Permissions (Manifest)
<uses-permission
android:name="android.permission.SEND_SMS" />
<uses-permission
android:name="android.permission.CALL_PHONE" />
<uses-permission
android:name="android.permission.READ_PHONE_STATE" />
-- Request at runtime for SDK 6.0+ --

Email Services and Permission Management
System Intents and Android Permission System
Email Services
Sending Email via Intent
Intent.ACTION_SEND
)
intent.type = "message/rfc822"
intent.putExtra(
Intent.EXTRA_EMAIL,
arrayOf("recipient@example.com")
)
intent.putExtra(
Intent.EXTRA_SUBJECT,
"Hello"
)
intent.putExtra(
Intent.EXTRA_TEXT,
"Email body"
)
Permission Management
Manifest Permissions

<uses-permission
android:name="android.permission.SEND_SMS" />
<uses-permission
android:name="android.permission.CALL_PHONE" />
<uses-permission
android:name="android.permission.INTERNET" />
-- Declared at install time --
Run-time Permission Request (SDK 6.0+)
if (Build.VERSION.SDK_INT
>= Build.VERSION_CODES.M
) {
if (ActivityCompat.
checkSelfPermission(
this,
Manifest.permission.
SEND_SMS
) != PackageManager.
PERMISSION_GRANTED
) {
ActivityCompat.
requestPermissions(
this,
arrayOf(Manifest.
permission.SEND_SMS),
1
)
}
}

Week 5: Animations & Notifications
View Animations
Create engaging visual effects on UI elements with built-in animation types.
Alpha (fade in/out)
Scale (resize)
Translate (move)
Rotate (spin)
Property Animations
Advanced animations that modify object properties over time.
ValueAnimator
ObjectAnimator
AnimatorSet
Custom property changes
Notifications
Deliver messages to users outside the app UI.
Notification channels
Notification builder
Actions and intents
Android 8.0+ requirements

Types of Animations and Implementation
Alpha, Scale, Translate, and Rotate Animations
Alpha Animation (Fade)
val alphaAnim = AlphaAnimation(
1.0f, 0.0f
)
alphaAnim.duration = 1000
myView.startAnimation(
alphaAnim
)
Scale Animation (Resize)
val scaleAnim = ScaleAnimation(
1.0f, 2.0f,
1.0f, 2.0f,
Animation.RELATIVE_TO_SELF,
0.5f,
0.5f
)
scaleAnim.duration = 1000
Translate Animation (Move)
val translateAnim =
TranslateAnimation(
0f, 200f,
0f, 200f
)
translateAnim.duration = 1000
myView.startAnimation(
translateAnim
)
Rotate Animation (Spin)
val rotateAnim = RotateAnimation(
0f, 360f,
0.5f,
0.5f
)
rotateAnim.duration = 2000

Notification System and Channels
Creating Notifications and Managing Notification Channels
Creating Notification Channel (Android 8.0+)
import android.app.NotificationChannel
import android.app.NotificationManager
val channelId = "my_channel"
val channelName = "Important"
val importance = NotificationManager.
IMPORTANCE_HIGH
val channel = NotificationChannel(
channelId,
channelName,
importance
)
channel.setDescription(
"Channel for alerts"
)
val manager = getSystemService(
NotificationManager::class.java
)
manager?.createNotificationChannel(channel)
Building and Displaying Notifications
import androidx.core.app.NotificationCompat
val builder = NotificationCompat.
Builder(this, "my_channel")
.setSmallIcon(R.drawable.icon)
.setContentTitle(
"New Message"
)
.setContentText(
"You have a new message"
)
.setPriority(
NotificationCompat.
PRIORITY_HIGH
)
.setAutoCancel(true)
val notification = builder.build()
manager?.notify(1, notification)
Notification with Activity Intent
this,
MainActivity::class.java
)
val pendingIntent = PendingIntent.
getActivity(
this,
0,
intent,
PendingIntent.
FLAG_UPDATE_CURRENT
)
val builder = NotificationCompat.
Builder(this, "my_channel")
.setSmallIcon(R.drawable.icon)
.setContentIntent(pendingIntent)
.setContentTitle("Alert")

Week 6: Activity Lifecycle
Understanding Lifecycle Callbacks and Resource Management
Lifecycle Phases
Creation Phase
Activity is created and initialized.
onCreate()
onStart()
Visible Phase
Activity becomes visible to user.
onResume()
onPause()
Destruction Phase
Activity is hidden and destroyed.
onStop()
onRestart()
onDestroy()

Activity Lifecycle Callbacks
Resource Management and State Preservation Patterns
onCreate()
override funonCreate(
savedInstanceState:
Bundle?
) {
super.onCreate(
savedInstanceState
)
setContentView(
R.layout.activity
)
// Init UI
// Load data
}
onStart()
override funonStart() {
super.onStart()
// Activity visible
// Start animations
// Register listeners
startLocationUpdates()
registerSensor()
}
onResume()
override funonResume() {
super.onResume()
// Activity interactive
// Resume operations
startCamera()
resumePlayback()
updateUI()
}
onPause()
override funonPause() {
super.onPause()
// Activity loses focus
// Save state
pausePlayback()
stopCamera()
saveData()
}
onStop()
override funonStop() {
super.onStop()
// Activity hidden
// Release resources
stopLocationUpdates()
unregisterSensor()
stopService()
}
onRestart() & onDestroy()
override funonRestart() {
super.onRestart()
// Restarting
}
override funonDestroy() {
super.onDestroy()
// Clean up
closeDatabase()
releaseMemory()
}

Splash Screens and ListView Implementation
Delayed Transitions and Dynamic List Display
Splash Screens
Using Handler for Delayed Transition
import android.os.Handler
import android.os.Looper
savedInstanceState: Bundle?
) {
super.onCreate(
savedInstanceState
)
setContentView(
R.layout.splash
)
Handler(Looper.
getMainLooper()
).postDelayed({
this,
MainActivity::class.java
)
finish()
}, 3000)
Using Coroutines for Delayed Transition
import kotlinx.coroutines.
GlobalScope
delay
launch
savedInstanceState: Bundle?
) {
super.onCreate(
savedInstanceState
)
setContentView(
R.layout.splash
)
GlobalScope.launch {
delay(3000)
this@SplashActivity,
ListView Implementation
Custom ArrayAdapter for ListView
classItemAdapter(
context: Context,
val items: List<String>
) : ArrayAdapter<String>(
context,
android.R.layout.
simple_list_item_1,
items
) {
override fungetView(
position: Int,
convertView: View?,
parent: ViewGroup
): View {
val view = super.
getView(
position,
convertView,
parent
)
val textView = view as
TextView
textView.text = items[position]
return view
}
}
Using ListView in Activity
val listView = findViewById<
ListView
>(R.id.listView)
val items = listOf(
"Item 1",
"Item 2",
"Item 3"
)
val adapter = ItemAdapter(
this,
items
)
listView.adapter = adapter
listView.setOnItemClickListener {

Summary and Progression to Week 7
Weeks 4-6 Recap and Week 7 Preview
Weeks 4-6: Achievements
Week 4: System Services
GSM services (SMS, Phone calls)
Email functionality via intents
Manifest permissions
Run-time permissions (SDK 6.0+)
Week 5: Animations & Notifications
View animations (Alpha, Scale, Translate, Rotate)
Property animations (ValueAnimator, ObjectAnimator)
Notification channels
Notification creation and management
Week 6: Activity Lifecycle
Lifecycle callbacks (onCreate, onStart, onResume, onPause, onStop, onDestroy)
Resource management
State preservation
Splash screens with Handler/Coroutines
Completed Work
Assignment 2 (Multi-Activity Data Passing & Animations), Lab 4-6 (System Services, Animations, Lifecycle)
Week 7 & Beyond: Coming Next
Week 7: Advanced UI Components
ListView with custom adapters
AutoCompleteTextView advanced usage
Data binding patterns
Dynamic list item layouts
Week 8: Connectivity Features
Wi-Fi connectivity detection
Bluetooth communication
Network state monitoring
Connection management
Week 9: Media and Camera
Camera access and image capture
Media playback
Gallery integration
Image processing
Next Assignment
Assignment 3 (Advanced ListView & AutoComplete) will be released in Week 7

Mobile_Application_Development_Weeks_4-6.pptx

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