每个类都必须具有自己的OnClickListener吗？

Question

Total Android beginner here...

I have an Activity with an OnClick Listener as in this example: Multiple Buttons `OnClickListener()` android

And now I'm setting up a listener on Floating Action Button in a different activity. What I'm not sure about is whether it is possible to use that same listener, or does each class have to have it's own?

ACTIVITY #1 // a regular activity
public class Requests extends AppCompatActivity implements View.OnClickListener {...}

ACTIVITY #2 // A RecyclerView, CardView type activity
public static class MyViewHolder extends RecyclerView.ViewHolder {...}

I'd really like to have one Listener to handle the cardview click events, as well as the Floating Action Button.

Answer 1

in general you can use the same listener for multiple buttons. if they are in different activities , you can write a seperate class that implements View.OnClickListener . Like this:

public class MyButtonListener implements View.OnClickListener {

@Override
public void onClick(View v) {
  switch (v.getId()) {

    case R.id.oneButton:
        // do your code
        break;

    case R.id.twoButton:
        // do your code
        break;

    case R.id.threeButton:
        // do your code
        break;// default method for handling onClick Events..
}

}

Then you just have to set your button listener like button.setOnClicklistener(new MyOnClickListener());

If your buttons are all doing the same action, you wont need the switch-case block.

Creating a seperate listener class is not a bad idea at all BUT: you should try to implement one for each activty to keep an overview over your button actions.

Answer 2

You can use below code snipet mentioned in the link below

Handle click item in Recycleview

In that onClick and onItemClick Override listener you can implement both Floating Action Button and cardview click events position wise

Answer 3

To perform same operation on click event of different view or viewGroup implement an anonymous class for OnClickListener as

View.OnClickListener mOnClickListener= new View.OnClickListener() {  
 @Override public void onClick(View v) {    /*do your code */ }};   

or call it in your activity as

 mbutton.setOnClickListener(mOnClickListener);   
    mcardView.setOnClickListener(mOnClickListener);