Develop Reference

How to save or change each row state on recyclerview item clicked?

I have created a horizontal recyclerview list. below is the image I have attached.
problem is that I have to change bulb state when everytime user clicked that row from off state to on state and on state to off state.
How do I implement this logic? please help me to find out the solution.
i want to change light color according to user clicks, if he clicks on then it should change its color for that row and vise versa
public void onClick(View view, int position) {
//toast("clicked" + position );
if (!lightClicked){
ImageView lightPopUp = view.findViewById(R.id.row_light_thumbnail);
DrawableCompat.setTint(lightPopUp.getDrawable().mutate(), ContextCompat.getColor(getContext(), R.color.white));
//toast("light on");
lightClicked = true;
}else {
ImageView lightPopUp = view.findViewById(R.id.row_light_thumbnail);
//toast("light off");
DrawableCompat.setTint(lightPopUp.getDrawable().mutate(), ContextCompat.getColor(getContext(), R.color.colorAccent));
lightClicked = false;
}
//View view1 = mLayoutManager.findViewByPosition(position);
}

Dont directly do this change as the recycler view's cells are reused and it wont work as expected, so instead apply the change in the list you are using. You can add a boolean variable in the model class of the list you use to populate the recycler view, and than on its click you can change the boolean's value and call notifydatasetchange on the adapter, and in bind view you should keep an If else condition based on that boolean for the Bulb's image
ie. if true set one image if false set another

declare this :
int selectedPosition=-1;
inside onBindViewHolder:
public void onBindViewHolder(FiltersAdapter.ViewHolder holder, int position) {
if(selectedPosition==position)
holder.itemView.setImageResource(R.drawable.higlihgt_image);
else
holder.itemView.setImageResource(R.drawable.normal_image);
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
selectedPosition=position;
notifyDataSetChanged();
}
});
}

I have 200 textviews and i want to know which one was pressed then how to change the text

I have a problem... have been thinking about it for a while now and been looking on line and still haven't come up with a clear explanation...
I have a number of textviews and have set onClickListeners to each of them.. and when the user clicks on one of them I want them to have the ability to change the text to another set of string array options which I have created progammatically. When the user selects an option the text should change to the option they choose. (I.e. TextView was A now it is B. hope this makes sense.. anyway... )
The current solution was to set a OnClickListener to every TextView and when someone pressed it an individual dialog showed. But I found that if I do this the code would be so long it would take an eternity to code so am hoping someone has a more elegant way of coding such a long process =(
So I guess my question would be... 1) is there a way I can find out which text view was pressed and then change the text of that TextView being pressed within a single method? to save me having to code 1000 alert dialogs...
http://i.stack.imgur.com/LRJGz.png

I would advise you to use a grid view.
You can see which textview was pressed like this:
gridView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View v, int position,
long id) {
//get id
switch (v.getId()) {
case R.id.textView1: ...
}
});

One of the ways to do what you want is to use the text view setTag() and getTag() methods.
On init of a text view use the setTag() to set some value to identify the view.
In the on click event use the getTag() on the view argument to know which view was clicked.

I would suggest holding the textviews in an array, like so:
TextView[] textViewArray = new TextView[textViewCount];
Then using a for loop assign each one a tag of integer - it's position
textViewArray.setTag(i)
And add an onClickListener to each one, again using a for loop:
textviewArray[i].setOnClickListener(etc...)
Then when one is clicked, you can use get the position of view that was clicked. This will require a custom method inside of your:
textviewArray.setOnClickListener(new customOnClickListener())
Where your customOnClickListner is like this:
private class customOnClickListener implements CompoundButton.{
public void OnClick(View view){
int position = (Integer) view.getTag()
///Do more code here - your processing
}
}
Hope that makes sense :)
For your for loops, you could use for(i = 0, i

Use set id for all text, where set the id positive integer(distinct), and then have one on view click listener(set it all) where u catch all text view clicks(downcast view with textview) and in side it put a switch case where you handle clicks on which text view is clicked.

You have to set "onClickListner" on all of of your textview.
For Saving some length of code i would suggest you create a function of your dialogbox, and give some int parameter to it, which would be directly called by the clickListener of textview,
Like ,
int i=0;
......
textView1 = (TextView)findViewById(R.id.yourtextview1);
textView2 = (TextView)findViewById(R.id.yourtextview2);
......
......
// and so on, for your all textviews
#Override
public void onClick(View view) {
if (view.equals(textView1)) {
i = 1;
CustomDialog(i);
}
//Similarly for all your textViews..
..........
Make A function CustomDialog Like
public void CustomDialog(int i){
if(i==1){
//Do something
}
}

how to change the font color of an item in a gridview (android)

I have a gridview of letters for a wordsearch and I'm trying to get it so when you click on a letter it changes colour (which is working fine). But I also want to be able to change the font color back if the word is not correct.
public void onItemClick(AdapterView<?> parent, View v, int position, long id)
{
Toast.makeText(TodaysPuzzleClass.this, "" + position, Toast.LENGTH_SHORT).show();
((TextView) v).setTextColor(Color.BLUE);
}
This is the code so when I click on an item it changes color.
Using the coordinates from my toast is it possble to change the items color that way?
looking aroung i need to use the postion if the item then changes its color, but how do i do that?

Try this one,
((TextView) v).setTextColor(Color.parseColor("#000000"));

setSelected(true) not work on custom view

I have created custom View called Color. I use object of Color to fill GridView (same issue is in ListView also).
My task is to let user choose one color and highlight it.
Previously I do something like that but I used only in building widgets and everything worked. This time I use my own.
This cose is for item clicking:
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
int color = (int)id;
Log.d(TAG, "Selected color: " + id);
view.setSelected(true);
view.invalidate();
}
Color.onDraw:
#Override
public void onDraw(Canvas canvas) {
if (isSelected()) {
Log.d(TAG, "color draw selected");
} else {
Log.d(TAG, "not selected " + color);
}
}
Also I set setChoiceMode(AbsListView.CHOICE_MODE_SINGLE); to this GridView (AbsListView.CHOICE_MODE_MULTIPLE don't help also)
In log I see:
Selected color: 8355711
not selected 16711680
not selected 16743680
not selected 8355711
I am sure, Color items is not recreating more than on time.
I tried change GridView to ListView, user default widget (overrided only onDraw()). Nothing helps. Maybe I forgot something?
In my opinion GridView somehow drop selected status.
If you need more info just tell.
Addition:
I checked with debugger. View with color 8355711 is same object in both functions.
I used setOnItemSelectedListener(this); to track item selection. But nothing happen in this listener.

The method isSelected() is comming from the GridView which is a child of View.
Basically when calling isSelected() you're saying: "is the gridview selected" which is not what you want.
What you want is: "is there any selected view in the grid view ?"
Which could be achieved using getSelectedView()
As the documentation says, you will get a reference to the selected view or null if none is selected.
Also make sur your GridView is properly initialized to handle item selection.
EDIT : Ok i understand that isSelected() is called from the Color view. My first guess is then useless.
But I think you should try to make your item selected using the setSelection() of the GridView object.
Add something like:
myGridView.setSelection(position);

I fix this issue my self by making my own select. Its workaround.
In Color class added:
private boolean selected = false;
public boolean isSelected2() {
return selected;
}
public void setSelected2(boolean selected) {
this.selected = selected;
}
#Override
public void onDraw(Canvas canvas) {
....
if (isSelected2()) {
//draw selected state
} else {
....
}
On ColorChooser grid:
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
...
int i = getChildCount();
while (--i >= 0)
((Color)getChildAt(i)).setSelected2(false);
((Color)view).setSelected2(true);
....
}
Reason why I not to override natice setSelected(boolean state) is some other code in grid every time make all items in deselected state. I don't know why, because in other places same more native code work very fine.

Hightlight the ListView row when a contained UI element of row is touched

I want to enable the orange highlight that occurs when touching a listView row.
If the onclick event was generated from the row itself, I can adjust the hightlight by setting the style of the listview. However in my case, the clicking event is generated by the TextView underneath with onclick event attached to it.
When touch event occurs, Listview isn't aware of clicking is happening. It doesn't receive focused or pressed event.
Is there bubbling or capturing technique I could use like Flex did? Or any suggestion/solution?
Thank you very much.

View tempView = null; // Class Variable to temporary store Clicked Row's view
Method:
public void onItemClick(AdapterView parent, View v, int position,long id)
{
listView.setFocusable(true);
listView.setSelected(true);
v.setBackgroundColor(Color.LTGRAY); // CHANGE COLOR OF SELECTED ROW HERE>
selectedId = (int)id;
if(tempView != null){
//If row is already clicked then reset its color to default row color
tempView.setBackgroundColor(Color.TRANSPARENT);
}
tempView = v;
}
Hope this helps. Thanks :)