Android development for iOS developers

Android development for iOS developers

• 1.
  Android Development foriOS Developers Darryl Bayliss @Dazindustries
• 4.
  Showing Content (iOS) -Storyboards - XIBs - Code
• 7.
  override func viewDidLoad(){ super.viewDidLoad() let textLabel = UILabel(frame: CGRectMake(40, 40, 200, 100)) textLabel.text = "Super amazing textlabel" self.view.addSubview(textLabel) let button = UIButton(frame: CGRectMake(50, 150, 50, 50)) button.titleLabel?.text = "Super amazing button" self.view.addSubview(textLabel) } override func viewDidAppear(animated: Bool) { super.viewDidAppear(animated) } override func viewDidDisappear(animated: Bool) { super.viewDidDisappear(animated) }
• 8.
  Showing Content (Android) -Navigation Editor Tool - Layouts - Code
• 12.
  @Override
 protected void onCreate(BundlesavedInstanceState) {
 super.onCreate(savedInstanceState);
 
 LinearLayout linearLayout = new LinearLayout(this);
 
 LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
 LinearLayout.LayoutParams.MATCH_PARENT,
 LinearLayout.LayoutParams.MATCH_PARENT);
 
 TextView textView = new TextView(this);
 textView.setText("Super amazing TextView");
 linearLayout.addView(textView); 
 Button button = new Button(this);
 button.setText("Super amazing Button");
 linearLayout.addView(button);
 
 setContentView(linearLayout, layoutParams);
 }
 
 @Override
 protected void onStart() {
 super.onStart();
 }
 
 @Override
 protected void onPause() {
 super.onPause();
 }
• 13.
  override func viewDidLoad(){ super.viewDidLoad() } override func viewDidAppear(animated: Bool) { super.viewDidAppear(animated) } override func viewDidDisappear(animated: Bool) { super.viewDidDisappear(animated) } @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 }
 
 @Override
 protected void onStart() {
 super.onStart();
 }
 
 @Override
 protected void onPause() {
 super.onPause();
 } View Controller Lifecycles
• 14.
  TableViews (iOS) - Implementthe Data Source / Table View Delegates - Override the required methods - Perform your logic
• 15.
  class tableViewController :UIViewController, UITableViewDataSource, UITableViewDelegate { @IBOutlet var tableView: UITableView! override func viewDidLoad() { super.viewDidLoad() tableView.dataSource = self tableView.delegate = self } func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return 10 } func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { let cell = UITableViewCell(style: UITableViewCellStyle.Value2, reuseIdentifier: nil) cell.textLabel?.text = "Super amazing cell text" return cell } }
• 16.
  RecyclerViews (Android) - Createa RecyclerView - Set RecyclerView Layout Manager - Set RecyclerView Adapter
• 17.
  @Override
 protected void onCreate(BundlesavedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 
 recyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
 
 LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
 recyclerView.setLayoutManager(linearLayoutManager);
 
 recyclerView.setAdapter(new RecyclerAdapter());
 }
• 18.
  public class RecyclerAdapterextends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
 
 public static class ViewHolder extends RecyclerView.ViewHolder {
 
 public TextView textView;
 public ViewHolder(TextView textView) {
 super(textView);
 textView = textView;
 }
 }
 
 @Override
 public RecyclerAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
 
 TextView v = (TextView) LayoutInflater.from(parent.getContext())
 .inflate(R.layout.recycler_item_textview, parent, false);
 
 RecyclerAdapter.ViewHolder vh = new RecyclerAdapter.ViewHolder(v);
 return vh;
 }
 
 @Override
 public void onBindViewHolder(ViewHolder viewHolder, int i) {
 viewHolder.textView.setText("Super amazing textview");
 }
 
 @Override
 public int getItemCount() {
 return 10;
 }
• 19.
  User Permissions (iOS) -Attempt to access a feature at runtime - Handle the result
• 20.
  class DetailViewController: UIViewController{ override func viewDidLoad() { super.viewDidLoad() } @IBAction func showCamera(sender: UIButton) { AVCaptureDevice.requestAccessForMediaType(AVMediaTypeVideo, completionHandler: { granted in if(granted) { // Do camera stuff here } else { // Handle user rejection } }) } }
• 21.
  User Permissions (Android6.0) - Attempt to access a feature at runtime - Handle the result
• 22.
  public class MainActivityextends Activity {
 
 final int CAMERA_REQUEST_CODE = 0;
 Button showCameraButton;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main); 
 showCameraButton = (Button) findViewById(R.id.show_camera_button);
 showCameraButton.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 showCamera();
 }
 });
 }
 
 public void showCamera() {
 
 if (checkSelfPermission(Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
 requestPermissions(new String[]{Manifest.permission.CAMERA}, CAMERA_REQUEST_CODE);
 
 } else {
 // ... Show camera
 }
 } @Override
 public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { 
 if (requestCode == CAMERA_REQUEST_CODE && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
 // ... Show Camera
 }
 } }
• 23.
  - Android isa mess of disparate OEMs and legacy versions - Fragmentation is a headache for developers - Fragmentation presents a lot of problems for enterprise… there aren’t many good solutions The Internet Said… Quotes from The Next Web, Open Signal & Tech Target
• 24.
  OS Fragmentation AndroidiOS Stats fromApple Developer, Android Developer
• 26.
  Device Screen Sizes AndroidiOS
• 27.
  Screen Sizes (iOS) -Autolayout - Setup constraints on views to accommodate multiple screen sizes - Use Size Classes for fine grained constraint control
• 28.
  Screen Sizes (Android) -Views & layouts can be designed to be pixel independent - Android resizes layouts based on device screen - Can design multiple variants of the same layout for specific device dimensions
• 31.
  OS Fragmentation (iOS) -Encourage users to update for new features - Encourage developers to support new features unavailable on older iOS versions - Runtime detection of OS version in code using Availability attributes
• 32.
  OS Fragmentation (Android) -Android Support Libraries - Provides features that are backwards compatible to devices running old versions of Android - Ability to support devices running Android 1.6 (Donut)
• 33.
  Material Design - AndroidsiOS 7 moment - A visual language based on paper / ink
• 34.
  Material Design
• 35.
  Build Targets /Gradle Localization Unit Testing UI Testing Extensions / Intents App Content Searching
• 37.
  Quiz Question #1 •Layout? • Activity? • Controller? What is the Android equivalent of a UIViewController?
• 38.
  Quiz Question #2 •Themes? • Styles? • Layouts? In Android, what are the files that hold your user interface
 elements for each screen called?
• 39.
  Quiz Question #3 •onCreate()? • onAppear()? • onStart()? What is Androids equivalent of a viewDidLoad lifecycle call?