Question

I have 24 buttons in my layout, all these buttons do something similar so I want to create a generic function. But first I need to know the name (xml id) of he button.

This the XML code of the button:

  <Button
      android:id="@+id/add_04"
      android:layout_width="42dp"
      android:layout_height="wrap_content"
      android:layout_gravity="center"
      android:layout_marginLeft="15dp"
      android:background="@xml/zbuttonshape"
      android:onClick="onClick"
      android:text="@string/mas" />

I set android:onClick="onClick" for all the buttons.

In my activity I’ve create a new function onClick:

This the code I’ve tried:

public void onClick(View v) {
        String name = v.getContext().getString(v.getId());
        String name2 = context.getString(v.getId());
        String name3 = getString(v.getId());
        String name4 = getResources().getString(v.getId()); 
}

But when I try to get the name (in this case "add_04") I always get "false".

Finally I’ve found a solution with the following code:

import java.lang.reflect.Field;

String name5 = null;
Field[] campos = R.id.class.getFields();
for(Field f:campos){
     try{
        if(v.getId()==f.getInt(null)){
            name5 = f.getName();
            break;
        }
       }
       catch(Exception e){
        e.printStackTrace();
    }
}

Is there an easier way to get this ID?

Answer 1

The approach is misguided to begin with. If you want to associate a piece of arbitrary data (e. g. a string) with a view, that’s what tag is for. The ID is numeric and it better stay that way. A word of caution though, tags are not unique in Android, watch for accidental tag collisions within the same view tree.

EDIT much later: the OP’s issue was a case of an XY problem. That said, the question title alone is a legitimate question in its own right.