android-lifecycle

I m making adapter to adapt my book collection to be visible in list view. Issue is solved if I add super(context, position): public BookAdapter(Context context, int position, List <Book> updatedBooksList) { super(context, position); this.context = context; this.booksList = updatedBooksList ; } However, I want to know why I need this argument (int position) and call superclass constructor? protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Also, in the broader sense why do we always(?) need to call super.onCreate like here in every onCreate? Aren't we

The docs state that This is called if the service is currently running and the user has removed a task that comes from the service's application. It seems as if it is only called when the app is swiped away from the recent task list. Pressing the back button until all Activities are destroyed in the task does not cause this to be called. Are there other scenarios where this could be called? Pressing the back button until all Activities are destroyed in the task does not cause this to be called. Finishing Activities by pressing the back button doesn't mean that running services and the

I need to know ImageView width and height. Is there a way to measure it in fragment ? In standard Activity I use this : @Override public void onWindowFocusChanged(boolean hasFocus) { super.onWindowFocusChanged(hasFocus); image.getWidth(); image.getHeight(); } But where can I use image.getWidth(); and image.getHeight(); in fragment ? DeeV Use the GlobalLayoutListener . You assign the listener to your ImageView in onCreateView() just like you do in that answer in the link. It also is more reliable than onWindowFocusChanged() for the main Activity so I recommend switching strategies. EDIT Example

Does anyone know of an exhaustive list of when the savedInstanceState bundle will be used in an activity? I know it's used when the device orientation changes. However, it doesn't seem to be used when the user force closes the app from the Android settings, but this might be due to something in my code. What other cases are there? To be clear, by "used" I mean when onCreate() is called, the savedInstanceState bundle is not null and contains the data I passed into it the last time onSaveInstanceState() was called. It's used when the Activity is forcefully terminated by the OS (ex: when your

So I have an Activity A and an Activity B. I want Activity A to be able to navigate to Activity B with the press of a button. That works, but when I use the up navigation(the home button in the action bar) to navigate back to Activity A, onCreate() is called again and the old information that the user typed in is lost. I've seen: onCreate always called if navigating back with intent , but they used Fragments, and I'm hoping not to have to redesign the entire app to use fragments. Is there any way I can stop onCreate() from being called every time Activity A becomes active again? This behavior

Just to be clear, I have read the dozen top SO questions on "IllegalStateException: Can not perform this action after onSaveInstanceState" and I have read Alex Lockwood's blog post on the issue http://www.androiddesignpatterns.com/2013/08/fragment-transaction-commit-state-loss.html So I'm not asking this blindly. I have a very simple use case case that doesn't involve AsyncTask or any background processing. I have a Fragment that contains a button. On the onClickListener for the button, I create a DialogFragment and show it. public final class OverviewFragment extends Fragment { @Override

I'm requesting images from presenter in adapter: @Override public void onBindViewHolder(SiteAdapter.ViewHolder holder, int position) { Site site = sites.get(position); holder.siteName.setText(site.getName()); requestHolderLogo(holder, site.getLinks().getLogoUrl()); } private void requestHolderLogo(final ViewHolder holder, final String logoUrl) { compositeSubscription.add( presenter.bitmap(logoUrl) .subscribe( bitmap -> { holder.siteLogo.setImageBitmap(bitmap); holder.siteLogo.setVisibility(View.VISIBLE); }, error -> { holder.siteName.setVisibility(View.VISIBLE); }) ); } I should unsubscribe

Basically, this is what I'm doing 1) Set AlarmManager to execute BroadcastReceiver (BCR) Intent intent = new Intent(m_Context, BCR.class); intent.putExtras(extras); PendingIntent pendingIntent = PendingIntent.getBroadcast(m_Context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); AlarmManager am = (AlarmManager) getSystemService(Context.ALARM_SERVICE); am.set(AlarmManager.RTC_WAKEUP, StartTime, pendingIntent) 2) Start MyActivity from BCR @Override public void onReceive(Context context, Intent intent) { Intent newIntent = new Intent(context, MyActivity.class); newIntent.addFlags(Intent.FLAG