listener
Angular JS $watch vs $on
The $watch function is used to watch variables on the scope. Scope inheritance allows you to watch parent scope variables as well, so that is definitely the way to go for your use case. As you correctly said, $on is used to watch for events, which you can $broadcast to child scopes or $emit to … Read more
RecyclerView – callback when view is no longer visible
Gonna respond to myself. Best approach is add RecyclerView.OnChildAttachStateChangeListener to my RecyclerView and then handle events with my WebView when onChildViewDetachedFromWindow(View view) is called. Example: mRecyclerView.addOnChildAttachStateChangeListener(new RecyclerView.OnChildAttachStateChangeListener() { @Override public void onChildViewAttachedToWindow(View view) { WebView webView = (WebView) view.findViewById(R.id.webview); if (webView != null) { webView.onResume(); } } @Override public void onChildViewDetachedFromWindow(View view) { WebView webView … Read more
How to use interface to communicate between two activities
I would suggest to create a model class. Let me give you an example: Model class: public class CustomModel { public interface OnCustomStateListener { void stateChanged(); } private static CustomModel mInstance; private OnCustomStateListener mListener; private boolean mState; private CustomModel() {} public static CustomModel getInstance() { if(mInstance == null) { mInstance = new CustomModel(); } return … Read more
Force re-firing of all (scripts / functions) on ajaxed content
The solution you choose here will have to depend on how the scripts are initialized. There are a couple common possibilities: The script’s actions are evoked immediately upon loading of the script. In this case, the script might look something like this: (function() { console.log(‘Running script…’); })(); The script’s actions are evoked in response to … Read more
Remove a listener from a view in android
Well, I found the answer. This doesnt appear to be documented anywhere, but I went through the code for the View class and if you pass null to the setClickListener methods, it will remove the listener. checkbox.setOnCheckChangedListener(null); This should work for any event listener.
Practical Usage of HttpSessionBindingListener And HttpSessionAttributeListener
The HttpSessionBindingListener is to be implemented on the class whose instances may be stored in the session, such as the logged-in user. E.g. public class ActiveUser implements HttpSessionBindingListener { @Override public void valueBound(HttpSessionBindingEvent event) { logins.add(this); } @Override public void valueUnbound(HttpSessionBindingEvent event) { logins.remove(this); } } When an instance of this ActiveUser get set as … Read more
set onClickListener for spinner item?
You SHOULD NOT call OnItemClickListener on a spinner. A Spinner does not support item click events. Calling this method will raise an Exception. Check this. You can apply OnItemSelectedListener instead. Edit : spinner.setOnItemSelectedListener(new OnItemSelectedListener() { public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { String selectedItem = parent.getItemAtPosition(position).toString(); if(selectedItem.equals(“Add new category”)) { // … Read more
Is it possible to create an Android Service that listens for hardware key presses?
As far as I know KeyEvents can only be handled by Activities as they are the interface to the user pressing the keys. Services run in the background and are not intended to react on user input. That’s also the reason of your compiler warning “onKeyDown is undefined for the type Service”. Service or any … Read more
Android setOnCheckedChangeListener calls again when old view comes back
What version of Android are you using? It seems to be an issue for multiple components, especially with a checkedChange() method (CheckBox, RadioButton) and I can’t provide a good explanation why it is happening. I would assume because it registers the change of the position state and grabs the change of other properties? A similar … Read more