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Refreshing data in RecyclerView and keeping its scroll position take user to the top of the activity

I'm trying to implement app like Instagram where user can like and share but when he press on a button (like image heart) .
///interface to get position
#Override
public void onitemclick(int position) {
position_of_image=position;
int num1=uploads.get(position_of_image).getNumber_likes();
uploads.get(position_of_image).setNumber_likes(num1+1);
String id=uploads.get(position_of_image).getId();
int number= uploads.get(position_of_image).getNumber_likes();
String name= uploads.get(position_of_image).getName();
String url=uploads.get(position_of_image).getImageUrl();
//updating the tables
Map<String,Object> map=new HashMap<>();
map.put(id,new Upload(name,url,number,id));
// mDatabaseRef.child(id).child("number_likes").setValue(number);
uploads.clear();
mDatabaseRef.updateChildren(map);
mRecyclerView.smoothScrollToPosition(position_of_image);
}
**and this is my interface on click in my adapter I want to make the like btn is red it done but disappears quickly **
#Override
public void onClick(View v) {
if (mlistener!=null){
int position=getAdapterPosition();
if (position!=RecyclerView.NO_POSITION){
mlistener.onitemclick(position);
}
like.setImageResource(R.drawable.red_heart);
}
public interface onlikeclic{
void onitemclick(int position);
}
public void setonitemclicklistener(onlikeclic listener){
mlistener=listener;
}

On item click, use call RecyclerView's smoothScrollToPosition(0) method.
You can see an example in this answer.

org.eclipse.ui.popupMenus link is grayed out

I created my own eclipse view and is trying to add a link in a popup menu. I am able to add the link but it's grayed out. I wonder how I can activate the link. I just want to be able to click on the link and trigger run(). DeleteAction is the class i want to trigger. SegmentReferencesView is the view I created. Would be very thankful for help.
This is from the plugin.xml:
<extension point="org.eclipse.ui.popupMenus">
<viewerContribution
id="se.test.views.categories.segmentreferences.ui.views"
targetID="se.test.views.categories.segmentreferences.ui.views.SegmentReferencesView">
<action
class="se.test.views.categories.segmentreferences.ui.views.DeleteAction"
enablesFor="1"
icon="icons/Delete.gif"
id="se.test.views.categories.segmentreferences.ui.views.DeleteReferenceAction"
label="Do action"
menubarPath="additions-ext">
</action>
</viewerContribution>
This is the Java class:
public class DeleteAction implements IViewActionDelegate {
#Override
public void init(org.eclipse.ui.IViewPart view) {
super.init(view);
};
#Override
public void run(IAction action) {
}
}

Your view must set the view site 'Selection Provider'. This is used by the menu system to find out what is selected. If you are using a TableViewer or TreeViewer you can just do:
getSite().setSelectionProvider(viewer);
in the view code immediately after you have created viewer (which should be the TableViewer or TreeViewer).

I managed to get the link to work by extending org.eclipse.core.commands.AbstractHandler in the DeleteAction class. I don't know if this is the best way to do it but it's working for now.
public class DeleteAction extends AbstractHandler implements IViewActionDelegate {
#Override
public void init(org.eclipse.ui.IViewPart view) {
// Not used
}
#Override
public void run(IAction action) {
System.out.println("run"); //$NON-NLS-1$
}
#Override
public void selectionChanged(IAction action, ISelection selection) {
// Not used
}
#Override
public Object execute(ExecutionEvent event) throws ExecutionException {
return null;
}
}

Android processing priority

I am using android eclipse for programming.
I will use this basic calculation to fit to what I want to happen.
Here:
I got two buttons add and minus. if i press add it will obviously call the method add.
But my problem is. if I will keep pressing add button. It will keep adding multiple times and
if I will click 2 buttons at the same time it will also do add and minus. What I want is that
if i click both button at the same time there's priority that add button will execute first
and the minus button will not send data.
Add(){
a = b + c;
}
Minus(){
a = b - c;
}
public void add(View view){
Add();
}
public void subtract(View view){
Minus();
}

Just set button_minus.setClickable(false); in Add method and
button_add.setClickable(false); in Minus method. Then enable them back.

try:
private boolean isAddButtonPressed;
private void setListener(){
buttonAdd.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_DOWN)
isAddButtonPressed = true;
else
isAddButtonPressed = false;
return false;
}
});
}
public void add(View view){
doMath(true);
}
public void subtract(View view){
if(!isAddButtonPressed)
doMath(false);
}
// "synchronized" means that this method can ran only one time at a time
private synchronized void doMath(boolean isAdd) {
if(isAdd) {
Add();
} else {
Minus();
}
}

Android: Live character count for EditText

I'm trying to get a character count of an EditText (numberRoom). When user would insert 8 characters button should switch from state Disabled and color 0xBBFFFFFF to state Enabled and color 0xFFFFFFFF.
I've tried few method and I think the best one I've found is that one below. However button has state Enabled and color 0xFFFFFFFF even when input is empty. What's wrong there?
public class Join_room_screen extends Activity {
EditText numberRoom;
Button goToRoom;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.joinroom);
numberRoom = (EditText) findViewById(R.id.roomNumber);
goToRoom = (Button) findViewById(R.id.goToRoom);
TextWatcher watcher = new LocalTextWatcher();
goToRoom.addTextChangedListener(watcher);
updateButtonState();
}
void updateButtonState() {
boolean enabled = checkEditText(numberRoom);
goToRoom.setBackgroundColor(0xFFFFFFFF);
goToRoom.setEnabled(enabled);
}
private boolean checkEditText(EditText edit) {
return ((edit.getText().toString()).length() == 8 );
}
private class LocalTextWatcher implements TextWatcher {
public void afterTextChanged(Editable s) {
updateButtonState();
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
}
}
However in properties I've

In this function the enabled variable is never used so the background colour and enabled states are always set.
void updateButtonState() {
boolean enabled = checkEditText(numberRoom);
goToRoom.setBackgroundColor(0xFFFFFFFF);
goToRoom.setEnabled(enabled);
}
I would replace with something like
void updateButtonState() {
boolean enabled = checkEditText(numberRoom);
if (enabled) {
goToRoom.setBackgroundColor(0xFFFFFFFF);
goToRoom.setEnabled(enabled);
} else {
//change them back to disabled state
}
}

You have one problem in updateButtonState(), it always sets one color to your button. I see, you have already solved that.
The other problem is that you set TextChangeListener not to an EditText, but somewhy to a Button.
The EditText should be watched.
numberRoom.addTextChangedListener(watcher);
instead of
goToRoom.addTextChangedListener(watcher);

PopupDateField Listener

I've got a PopupDateField with a ValueChangeListener.
Is there a way to differentiate if the Event was fired from an .setValue()-Call or an User-Input?
I want the Event to be excuted only if the user changes the value, not if it was changed by program.
I've made a dirty Workaround by removing the ValueChangListener before setting a new Value and adding it afterwards, but I'm thankfull for better solutions...
private static void setDateFieldValue(final PopupDateField dateField, Date value) {
Collection<Property.ValueChangeListener> listeners = (Collection<Property.ValueChangeListener>)dateField.getListeners(Property.ValueChangeEvent.class);
listeners.forEach(new Consumer<Property.ValueChangeListener>() {
#Override
public void accept(Property.ValueChangeListener listener) {
dateField.removeValueChangeListener(listener);
}
});
dateField.setValue(value);
listeners.forEach(new Consumer<Property.ValueChangeListener>() {
#Override
public void accept(Property.ValueChangeListener listener) {
dateField.addValueChangeListener(listener);
}
});
}