Develop Reference

How to get the name of view programatically such as whether it's textview or button by View params in onClick callback in Android?

In particular class, from many places call back is coming, i just want to whether it's coming text or button for example, so that I can set the data accordingly.
NOTE: I'm not talking about parent layout, I want to know exact name where the event click is happened!
If I'm doing this: Log.d("Hello", "Clicked finally: "+ view?.id)
This is coming:
D: Clicked finally: 2131296625

If you are using Kotlin, You can simply check if the View is Button or Image using is operator like:
when(view) {
is Button -> {
// a Button is clicked.
}
is AppCompatImageView -> {
// an Image is clicked.
}
else -> {
// any other view is clicked.
}
}

You can do something like this:
if (view.javaClass.simpleName == Button::class.java.simpleName) {
// it is a button
} else if (view.javaClass.simpleName == TextView::class.java.simpleName) {
// it is a text view
}
Please note that this won't work if you are using any subclass of Button or TextView. You will need to explicitly specify the class you want to check for.

How to check if button has been clicked

I have a bunch of dynamic buttons which I am setting an onClickListeners as they are produced, as well as tagging them with IDs.
Not sure if this a simple one which I have just spent too much time staring at but this is the problem.
If a user clicks a button, it changes colour this is simple and has been achieved by:
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (counter == 0) {
button.setBackgroundColor(Color.parseColor("#FF4DCBBF"));
Toast.makeText(getActivity(), "User Has Been Marked As Present",Toast.LENGTH_LONG).show();
//change boolean value
userPresent = true;
counter++;
} else {
button.setBackgroundColor(Color.parseColor("#FFFFFF"));
Toast.makeText(getActivity(), "User Has Been Marked As Absent",Toast.LENGTH_LONG).show();
//change boolean value
userPresent = false;
counter = 0;
}
}
});
If the user clicks it again, it will change back to the previous colour - but...
If the user clicks one of the other dynamic buttons that hasn't been previously clicked, the counter is thrown out.
I need to know if the button has been clicked and if not, should mark the user as present.
Currently, If on one button I click it and mark the user as present, and then move onto the next button, I will have to click it once (which marks the user as absent due to the counter) then press it again to mark the user as present.
I need the counter to treat each button individually, any ideas how this could be achieved?

Once the user has been marked present,maybe disable the onClick listener for that button since you wouldn't need it anymore?

I don't mean to sound condescending but I'm having trouble understanding what you're trying to achieve, but if each button is supposed to hold different information about a user, why not make a custom button that does just that? Make a class called customButton in your package and paste the following code there:
import android.content.Context;
import android.widget.Button;
public class customButton extends Button {
boolean haveIBeenClicked; //false by default
public customButton(Context context) {
super(context);
}
public void toggleHaveIBeenClicked(){
haveIBeenClicked=!haveIBeenClicked;
updateBackgroundColor();
}
void updateBackgroundColor(){
if (haveIBeenClicked){
this.setBackgroundColor(Color.parseColor("#FF4DCBBF"));
}
else{
this.setBackgroundColor(Color.parseColor("#FFFFFF"));
}
}
}
then, inside the onClick method (in the activity whose snippet you've shown earlier) you can just call
((customButton)v).toggleHaveIBeenClicked();
...after having created a customButton object and setting an on click listener on it.
Please let me know if this achieves what you desired. If you have trouble running this code, make sure to let me know if the comments and we'll work it out

Listening for clicks on a disabled AlertDialog-Button

I want to listen for clicks on the positive button of an AlertDialog, which I have disabled by calling button.setEnabled(false);.
How should I do this? If this is not possible, is there a known workaround?
PS. The reason I want to do this, is that I want to show a toast when somebody hits the button, saying "You need to do this before you can continue".

This is not a way to listen for clicks on a disabled button. This is a workaround.
I liked the result I got by changing the color of the button, making it look like it's disabled.
What you want to do:
// Instantiate positive button
final Button posButton = ((AlertDialog) getDialog()).getButton(DialogInterface.BUTTON_POSITIVE);
// Save the original button's background
final Drawable bg = posButton.getBackground();
// Set button's looks based on boolean
if (buttonDisabled) {
posButton.setTextColor(getResources().getColor(R.color.disabledButtonColor, null));
// R.color.disabledButtonColor == #DBDBDB, which is pretty close to
// the color a disabled button gets.
posButton.setBackgroundColor(Color.TRANSPARENT);
// Color.TRANSPARENT makes sure all effects the button usually shows disappear.
} else {
posButton.setTextColor(getResources().getColor(R.color.colorPrimaryDark, null));
// R.color.colorPrimaryDark is the color that gets used all around my app.
// It was the closest to the original for me.
posButton.setBackground(bg);
// bg is the background we got from the original button before.
// Setting it here also re-instates the effects the button should have.
}
Now, don't forget to catch your buttons actions whenever it's "disabled"
public void onClick(View v) {
if (buttonDisabled) {
// Button is clicked while it's disabled
} else {
// Button is clicked while it's enabled, like normal
}
}
That should do, have fun with it.

100 Buttons and only 1 Active

I have one activity and here i have 100 buttons, i want that when i press Button 1 then press another Button the Button 1 should get unpressed.
i know i can make this with
if(Button1.isPressed()) {
Button2.setPressed(false);
Button3.setPressed(false);
Button4.setPressed(false);
Button5.setPressed(false);
Button6.setPressed(false);
Button7.setPressed(false);
Button8.setPressed(false);
......................... }
else { do nothing }
.... BUT!
it's too much code
Coders will kill me or will just laugh on me.
any ideas?
maybe there is a way to unpress the all buttons from the activity?

Not the prettiest solution ever, but you could make an OnClickListener like this:
View.OnClickListener listener = new View.OnClickListener() {
public void onClick(View v) {
ViewGroup parent = (ViewGroup) v.getParent();
for (int i = 0; i < parent.getChildCount(); i++) {
View current = parent.getChildAt(i);
if (current != v && current instanceof Button) {
((Button) current).setPressed(false);
}
}
((Button) v).setPressed(true);
}
}
and attach it to all of your buttons.
Then, whenever a button is clicked, it will iterate over all views that are in the same layout (or actually, view group) as the clicked button, and, for any of those views that are buttons except for the clicked button, it will call setPressed(false).
Note that this only works out of the box if all the buttons are in the same layout. If they are in nested layouts, you will have to adapt it a little.
Off topic: What do you need 100 buttons for? That's a lot of buttons. You may want to redesign your user interface

Ok so instead of looping through all the buttons on over and over again when one button is pressed, you can just store a variable which stores the button number of the button that was last pressed. Now, when the second button is pressed, disable the button that was pressed earlier, you get its index from the saved variable, enable the button that was pressed and store its index in the variable.
Heres an example pseudo code to give you and idea:
int buttonLastPressed = 0;
void onButtonClick(Button buttonPressed){
if(buttonLastPressed != 0){
disableButton(buttonLastPressed);
enableButton(buttonPressed);
buttonLastPressed = buttonPressed.getIndex()
}
}
Saves you from looping through each and every button to disable it.

Define id of button 1 to 100
When press button occurs save it's id in some member variable like previous_pressed
Before updating a previous_pressed value find and unpress previous pressed button like this
Button previous_pressed_button = (Button) findViewById(previous_pressed);
Now you have the previous pressed button, So upress it or whatever.

how to implement simple like button in listview of each item

I have certain entries in my list view item. There I have a simple "like button" (not facebook like button). You can see the above mentioned SCREENSHOT; for the reference.
The moment I click on like button; i want the like button color to be changed and the like button color should remain same(changed on like) when I'll login again.
Also, all the entries must get filled in Database with cust_id, bus_id, Offer_id using json; that I know very well.
When I again click on the same button(like button), whose color has been changed. It must be changed back to the default color and data must get removed from database.
How can I do this...?
1. How to get value of click button.
2. How to bring back the changed color to default; once the button has been re-clicked.
Plz suggest me...
this is button code
holder.b1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (clicked) {
holder.b1.setBackgroundResource(R.drawable.like_icon_hover);
} else {
holder.b1.setBackgroundResource(R.drawable.like_icon);
}
clicked = true;
}
});

You need to add a listener to the button and using ValueAnimator you can change the button color and reverse it back when you click again.
Here is a simple and best approach to achieve your scenario. Add the onClick listener for the button in your list item like this.. I have explained each line ..
// set a default background color to the button
placeHolder.likeButton.setBackgroundColor(Color.RED);
placeHolder.likeButton.setOnClickListener(new View.OnClickListener() {
ValueAnimator buttonColorAnim = null; // to hold the button animator
#Override
public void onClick(View v) {
// first time this will be null
if(buttonColorAnim != null){
// reverse the color
buttonColorAnim.reverse();
// reset for next time click
buttonColorAnim = null;
// add your code here to remove from database
}
else {
final Button button = (Button) v;
// create a color value animator
buttonColorAnim = ValueAnimator.ofObject(new ArgbEvaluator(), Color.RED, Color.BLUE);
// add a update listener for the animator.
buttonColorAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
#Override
public void onAnimationUpdate(ValueAnimator animator) {
// set the background color
button.setBackgroundColor((Integer) animator.getAnimatedValue());
}
});
// you can also set a delay before start
//buttonColorAnim.setStartDelay(2000); // 2 seconds
// start the animator..
buttonColorAnim.start();
// add your code here to add to database
}
}
});
This will change the button color on your first click and then revert the color back on the next click. You can also set a delay to change the color.
Note: You have to set the default button color based on your logic.

#Override
public void onClick(View view) {
if(!check)
{
personViewHolder.img_like_job.setImageResource(R.drawable.ic_thumbsup_blue);
check = true;
}
else
{
personViewHolder.img_like_job.setImageResource(R.drawable.ic_thumbsup);
check = false;
}
}

you can use custom adapter for your listview(it has own layout.xml),and you can set your clicklistener in it.
You can change color or what you want. Actually I did have project like you want.I put some link if you can t do it.

Try following:
use setOnClickListener() on the button.
eg.
viewHolder.imgVwFbLike.setOnClickListener(new View.OnClickListener() {
#Override public void onClick(View v) {
// TODO :
// 1. make webservice call to update like status (Assuming a web service call)
// 2. Implement a callback for webservice call, to get the status of request.
if(success)
a) change the colour of like btn. and insert the data in Db.
b) Also maintain a column in db for likestatus(by default set it false).
}
}
);
Assuming you are fetching the data from db when you login, you can check the likestatus and set the color of button accordingly.