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How to add cards in a cardview(recyclerview) with different colours for each card according to the user's selection?

I am making an app which uses recyclerview, database and cardview to show the elements. I want to add a feature which allows the user to select the colour of each card they add. For instance, there red or green. Since I am just a beginner I do not know how to implement this feature. Any help would be appreciated! Thank you!

add below code in onBindViewHolder method
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (holder.itemView.getBackgroundTintList().equals(ColorStateList.valueOf(Color.RED))){
holder.itemView.setBackgroundTintList(ColorStateList.valueOf(Color.GREEN));
}else {
holder.itemView.setBackgroundTintList(ColorStateList.valueOf(Color.RED));
}
}
});
this code change the color of each cardView by clicking.

Change the color of the icon in the ImageView in the java class

I showed the icons in the program via ImageView. The yellow icons should turn red when the button is pressed. I tried all the methods, but none of them worked. ...Backgroundcolor... He turned ImageView red in full square shape. I just want the icon to change color. This is very difficult‚ Please help. Thank you.
My code:
ImageView Test = (ImageView) findViewById(R.id.TestImageIcon);
button2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Here
Test.setcolor(R.id.red);
}
});

you change the tint of drawable like that:
imageView.setColorFilter(context.getResources().getColor(R.color.yourColor), PorterDuff.Mode.SRC_IN);

It can be done using setColorFilter(color).

Try to change color of icon programatically with
Test.setColorFilter(ContextCompat.getColor(YourActivity.this, R.color.red));

Android: checking a view's background

I have 3 buttons, all of them have the same background drawable by default (subject_button)
What I want to do:
When I click one button his background changes ( to clicked_subject), all the others remain with the default background, if I click one button after clicking another, the button I just clicked changes his background while the previous one gets back to the initial background, allowing only one button to have the clicked_subject background, if the diffrent button gets clicked again his background goes back to the initial one, leting all the buttons with the initial background.
The problem:
If I click the diffrent button, his background remains the same instead of changing back to the initial one.
My logic:
theButton1.setBackgroundResource(R.drawable.subject_button);
theButton1.setOnClickListener(this);
//same for other 2
#Override
public void onClick(View v) {
if (v.getBackground() == ContextCompat.getDrawable(this, R.drawable.subject_button)) {
theButton1.setBackgroundResource(R.drawable.subject_button);
theButton2.setBackgroundResource(R.drawable.subject_button);
theButton3.setBackgroundResource(R.drawable.subject_button);
v.setBackgroundResource(R.drawable.clicked_subject);
} else {
v.setBackgroundResource(R.drawable.subject_button);
}
Why is this happening?

You can do this:
private final List<Button> mButtons = new ArrayList<>();
// somewhere in your code
mButtons.add(mButton1);
mButtons.add(mButton2);
mButtons.add(mButton3);
mButton1.setOnClickListener(mClickListener);
mButton2.setOnClickListener(mClickListener);
mButton3.setOnClickListener(mClickListener);
private final View.OnClickListener mClickListener = new View.OnClickListener() {
#Override
public void onClick(View v) {
for (Button button : mButtons) {
if (button == v) {
// set selected background
} else {
// set not selected backround
}
}
}
};
If you define a stateful drawable for your buttons, then you can simply change the onclick to this:
private final View.OnClickListener mClickListener = new View.OnClickListener() {
#Override
public void onClick(View v) {
for (Button button : mButtons) {
button.setSelected(v == button);
}
}
};

For changing background color/image based on the particular event(focus, press, normal), you need to define a button selector file and implement it as background for button. For example button_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true"
android:drawable="#drawable/your_image1" /> <!-- pressed -->
<item android:state_focused="true"
android:drawable="#drawable/your_image2" /> <!-- focused -->
android:drawable="#drawable/your_image3" <!-- default -->
</selector>
then just apply it as :
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawable="#drawable/button_selector.xml" />

I solved it by instead of changing only the background color on clicking the button, I also change the textColor, then I can check the textColor with if (((Button) v).getCurrentTextColor() == Color.WHITE)

"Pressed", "selected", "disabled" and such are View states. As such they're supposed to be handled automatically by Android and not by your click listeners.
This is achieved using SateLists, which control the look your Views sould have depending on which state(s) they're in. So you can easily set subject_button as the unpressed state, clicked_subject as the pressed state, and let Android take care of actually switching between them.
Full explanation: https://developer.android.com/guide/topics/resources/drawable-resource.html#StateList

How to toggle picture src of ImageButton

I have an image button and want that when the user clicks on it-it changes its src to a different drawable-but i want the background color i defined in xml to remain the same. Here is the code that i have done so far, but doesnt work, because im changing background and not the source-but general concept i will use:
public void onClick(View view) {
if (bgenabled == true) {
holder.ib.setBackground(res.getDrawable(R.drawable.location_deactive));
bgenabled = false;
} else { holder.ib.setBackground(res.getDrawable(R.drawable.location_active));
bgenabled = false;}

Just call the setImageDrawable to replace the current image you are using
with your ImageButton.
ImageButton button;
...
button.setImageDrawable(getResources().getDrawable(R.drawable.new_image));

Temporarily swap image in button's background after click

I have prepared a two graphics for background of my button. I have one put in "android:background" in xml file and I have no idea how to make to change this image for another image for a while after click.
I tried to do this using OnHoverListener and OnClickListener but it doesn't work
Button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Button.setBackground(getResources().getDrawable(
R.drawable.img_hovered));
Button.setBackground(getResources().getDrawable(R.drawable.img));
}
});

if you want to make it clickable button, then make a selector xml in drawable folder and copy below code.
lets take its name as app_click.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:drawable="#drawable/yourimage_pressed" android:state_pressed="true"/>
<item android:drawable="#drawable/yourimage_unpressed"/>
</selector>
then use this selector for your button Selector.
like this
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/app_click" />

See if the following does what you are looking for. The code assumes that R.drawable.img is the original background. When Button is clicked, the background changes to R.drawable.img_hovered for 0.5 seconds. Then it reverts back to R.drawable.img:
Button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Button.setBackground(getResources().getDrawable(
R.drawable.img_hovered));
new Handler().postDelayed(new Runnable() {
public void run() {
Button.setBackground(getResources().getDrawable(R.drawable.img));
// Button Click Code Here
}
}, 500L); // 0.5 Seconds
}
});