App Development

                                              Preparing for App Store Submission Google Play Store: Google Play Developer Account: Register for a Google Play Developer account. Pay the one-time registration fee. Complete your account setup. App Information: Title and description: Provide a clear and concise title and detailed description of your app. Screenshots: Include high-quality screenshots of your app in various states and screens. Icon: Use a high-resolution app icon that represents your app well. Feature graphic: Add a feature graphic for promotion in the Play Store. Content Rating: Complete the content rating questionnaire to receive a rating for your app. Privacy Policy: Provide a URL to your app’s privacy policy, especially if your app requests sensitive permissions. Target Audience and Content: Specify the target age group and content appropriateness for your ap...

  Writing Unit Tests and UI Tests Unit Testing: Unit tests verify that individual units of code (e.g., functions, classes) work as expected. Android: Setting Up: Add the following dependencies to your build.gradle file: gradle Copy code testImplementation 'junit:junit:4.13.2' testImplementation 'org.mockito:mockito-core:3.11.2' Writing a Unit Test: kotlin Copy code class MyUnitTest { @Test fun addition_isCorrect () { assertEquals( 4 , 2 + 2 ) } } Using Mockito for Mocking: kotlin Copy code class MyServiceTest { @Mock lateinit var myDependency: MyDependency @Before fun setUp () { MockitoAnnotations.initMocks( this ) } @Test fun testService () { ` when `(myDependency.someMethod()).thenReturn( "mocked result" ) val service = MyService(myDependency) assertEquals( "mocked result" , service.doWork()) } } iOS: Setting Up: Create a new unit test target ...

  Using AsyncTask and Coroutine in Android AsyncTask (Deprecated in Android 11): AsyncTask was used to perform background operations and publish results on the UI thread without having to manipulate threads and/or handlers. Basic Structure of AsyncTask: Create a subclass of AsyncTask: kotlin Copy code private class MyAsyncTask : AsyncTask < Void, Void, String >() { override fun doInBackground ( vararg params: Void ?) : String { // Perform background computation return "Result" } override fun onPostExecute (result: String ) { // Update UI with result super .onPostExecute(result) textView.text = result } } Execute the AsyncTask: kotlin Copy code MyAsyncTask().execute() Using Coroutines: Coroutines provide a more powerful and efficient way to handle asynchronous tasks in Android. Setup: Add the dependencies to your build.gradle : gradle Copy code implementation 'org.jetbrains.kotlinx:kotlinx-co...

Understanding App Permissions in Android In Android, permissions are used to protect the privacy of the user. Depending on the sensitivity of the data or actions your app needs to access, permissions are divided into different categories. Types of Permissions: Normal Permissions: These permissions do not pose a significant risk to the user's privacy or the operation of other apps. They are automatically granted at install time. xml Copy code < uses-permission android:name = "android.permission.INTERNET" /> Dangerous Permissions: These permissions give the app access to the user's sensitive data or control over the device. The user must explicitly grant these permissions. xml Copy code < uses-permission android:name = "android.permission.CAMERA" /> Requesting Permissions at Runtime: Since Android 6.0 (API level 23), dangerous permissions need to be requested at runtime. Check if Permission is Granted: kotlin Copy code if (ContextCompat.checkS...

  Implementing Animations and Transitions Android: Property Animations: Property animations allow you to animate the properties of objects (e.g., alpha, rotation, translation). kotlin Copy code val view: View = findViewById(R.id.my_view) view.animate() .alpha( 0.5f ) .translationY( 100f ) .setDuration( 300 ) .start() Transition Framework: The Transition framework allows you to animate changes in the layout. kotlin Copy code val sceneRoot: ViewGroup = findViewById(R.id.scene_root) val scene1 = Scene.getSceneForLayout(sceneRoot, R.layout.scene1, this ) val scene2 = Scene.getSceneForLayout(sceneRoot, R.layout.scene2, this ) TransitionManager.go(scene2) Using Lottie for Complex Animations: Lottie is a library for rendering animations exported from Adobe After Effects. gradle Copy code implementation 'com.airbnb.android:lottie:3.4.0' kotlin Copy code import com.airbnb.lottie.LottieAnimationView val animationView: LottieAnimationView = findViewById(R.id.animat...