Android development for iOS developers

Android Development for iOS
Developers
Darryl Bayliss
@Dazindustries

Showing Content (iOS)
- Storyboards
- XIBs
- Code

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)
}

Showing Content (Android)
- Navigation Editor Tool
- Layouts
- Code

@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(); 
}

super.viewDidLoad()
}
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
}
override func viewDidDisappear(animated: Bool) {
super.viewDidDisappear(animated)
}
@Override 
} 
 
@Override 
protected void onStart() { 
super.onStart(); 
} 
 
@Override 
protected void onPause() { 
super.onPause(); 
}
View Controller Lifecycles

TableViews (iOS)
- Implement the Data Source / Table View
Delegates
- Override the required methods
- Perform your logic

class tableViewController : UIViewController, UITableViewDataSource, UITableViewDelegate {
@IBOutlet var tableView: UITableView!
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
}
}

RecyclerViews (Android)
- Create a RecyclerView
- Set RecyclerView Layout Manager
- Set RecyclerView Adapter

@Override 
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()); 
}

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; 
}

User Permissions (iOS)
- Attempt to access a feature at runtime
- Handle the result

class DetailViewController: UIViewController {
super.viewDidLoad()
}
@IBAction func showCamera(sender: UIButton) {
AVCaptureDevice.requestAccessForMediaType(AVMediaTypeVideo, completionHandler: { granted in
if(granted) {
// Do camera stuff here
}
else {
// Handle user rejection
}
})
}
}

User Permissions (Android 6.0)
- Attempt to access a feature at runtime
- Handle the result

public class MainActivity extends Activity { 
 
final int CAMERA_REQUEST_CODE = 0; 
Button showCameraButton; 
 
@Override 
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 
} 
}
}

- 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

OS Fragmentation
AndroidiOS
Stats from Apple Developer, Android Developer

Device Screen Sizes
AndroidiOS

Screen Sizes (iOS)
- Autolayout
- Setup constraints on views to
accommodate multiple screen sizes
- Use Size Classes for fine grained
constraint control

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

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

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)

Material Design
- Androids iOS 7 moment
- A visual language based on paper / ink

Build Targets / Gradle
Localization
Unit Testing
UI Testing
Extensions / Intents
App Content Searching

Quiz Question #1
• Layout?
• Activity?
• Controller?
What is the Android equivalent of a UIViewController?

Quiz Question #2
• Themes?
• Styles?
• Layouts?
In Android, what are the ﬁles that hold your user interface 
elements for each screen called?

Quiz Question #3
• onCreate()?
• onAppear()?
• onStart()?
What is Androids equivalent of a viewDidLoad lifecycle call?

Android development for iOS developers

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