Android development for iOS developers
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The document compares Android and iOS development, detailing respective UI design practices, lifecycle methods, and user permissions handling. It highlights the challenges of OS fragmentation in Android, mentioning the need for backward compatibility through support libraries. The document includes code examples for user interface implementation and covers quiz questions related to framework components.
![public class MainActivity extends 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
}
}
}](https://image.slidesharecdn.com/androiddevelopmentforiosdevelopers-150909212506-lva1-app6891/85/Android-development-for-iOS-developers-22-320.jpg)
Android development for iOS developers
- 1. Android Development for iOS 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(Bundle savedInstanceState) { 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) - Implement the 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) - Create a RecyclerView - Set RecyclerView Layout Manager - Set RecyclerView Adapter
- 17. @Override protected void onCreate(Bundle savedInstanceState) { 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 RecyclerAdapter extends 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 (Android 6.0) - Attempt to access a feature at runtime - Handle the result
- 22. public class MainActivity extends 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 is a 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 from Apple Developer, Android Developer
- 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 - Androids iOS 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?