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/*
  Source: http://www.littlerobots.nl/blog/Handle-Android-RecyclerView-Clicks/
  USAGE:
   
  ItemClickSupport.addTo(mRecyclerView).setOnItemClickListener(new ItemClickSupport.OnItemClickListener() {
      @Override
      public void onItemClicked(RecyclerView recyclerView, int position, View v) {
          // do it
      }
  });

kathisai

public class AccountAuthenticator extends AbstractAccountAuthenticator {

  private final Context context;
  @Inject @ClientId String clientId;
  @Inject @ClientSecret String clientSecret;
  @Inject ApiService apiService;

  public AccountAuthenticator(Context context) {
    super(context);

kathisai

// ABSTRACT CLASSES
// An abstract class only has method declarations. it is intended to be
// a superclass for other classes. It doesn't define how methods are
// implemented, only that they are implemented. Abstract classes cannot
// be instantiated and subclasses MUST implement abstract methods.

abstract class FlyingAnimal {
    public abstract void Fly();
}

kathisai

abstract class Shape 
{ 
	String color; 
	
	// these are abstract methods 
	abstract double area(); 	
	// abstract class can have constructor 
	public Shape(String color) { 
		this.color = color; 
	} 

kathisai

//Interface declaration: by first user  
interface Drawable{  
void draw();  
}  
//Implementation: by second user  
class Rectangle implements Drawable{  
public void draw(){
  System.out.println("drawing rectangle");
}  
}  

kathisai

    FragmentB fragmentA= new FragmentB();
    fragmentA.setTargetFragment(FragmentA.this, REQUEST_DATE);
    getActivity().getSupportFragmentManager().beginTransaction().replace(R.id.Layout_container, nextFrag, “findThisFragment”).addToBackStack(null).commit();

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@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) { 
 if (resultCode != Activity.RESULT_OK) {
 return;
 }
 if (requestCode == REQUEST_DATE) { 
 Date date = (Date) data .getSerializableExtra("EXTRA_DATE"); //EXTRA_DATE is key used in FragmentB
 }
}

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private void sendResult(int resultCode, Date date) {
 if (getTargetFragment() == null) {
 return;
 }
Intent intent = new Intent(); 
 intent.putExtra(EXTRA_DATE, date); 
 getTargetFragment() .onActivityResult(getTargetRequestCode(), resultCode, intent);
 } 
}

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public class ExampleService extends IntentService {
private static final String TAG = "ExampleService"; 
public static Intent newIntent(Context context) {
return new Intent(context, ExampleService.class); 
}
public ExampleService() {
super(TAG); 
}
@Override
protected void onHandleIntent(Intent intent) {

kathisai

class ExampleService : IntentService("ExampleService") {

    override fun onHandleIntent(intent: Intent?) {
        // Normally we would do some work here, like download a file.
        // For our sample, we just sleep for 5 seconds.
        try {
            Thread.sleep(5000)
        } catch (e: InterruptedException) {
            // Restore interrupt status.