How to show the value of my tag when I click it?

 <Button
android:id="@+id/On"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="92dp"
android:text="Prender"
app:layout_constraintStart_toStartOf="parent"
<tag android:id="@+id/on_tag" android:value="1" />


<Button
    android:id="@+id/Off"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="8dp"
    android:tag="0"
    android:text="Apagar"
    app:layout_constraintEnd_toStartOf="@+id/On"
    app:layout_constraintStart_toStartOf="parent"
    tools:layout_editor_absoluteY="143dp"
    <tag android:id="@+id/on_tag2" android:value="0" />

How can I show the value of my tag when I click it? I want to create onClick event to see the value 0 or 1 "I want an INT value" not string

It's the same if I use

android:id="@+id/Off"
android:value="1"

or

<tag android:id="@+id/On" android:value="1" />

This is the .kt I'm using kotlin and need to show the int value of the tag

class MainActivity : AppCompatActivity() {

    override fun onClick(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.this)

        On.setOnClickListener(View.OnClickListener { v ->
            Log.e(
                FragmentActivity.TAG,
                v.getTag(R.id.on_tag)?.toString()
            )
        })

        Off.setOnClickListener(View.OnClickListener { v ->
            Log.e(
                FragmentActivity.TAG,
                v.getTag(R.id.on_tag2)?.toString()
            )
        })


    }


}

Inside onClick(View v) you can call v.getTag() as follows

 Button btnOn = (Button)findViewById(R.id.On);
 btnOn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.e(TAG,String.valueOf(v.getTag())); 
            }
        });

But for above code to work you xml should be as follows.

<Button
    android:id="@+id/On"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="8dp"
    android:layout_marginTop="92dp"
    android:text="Prender"
    android:tag="1"
    app:layout_constraintEnd_toStartOf="@+id/Off"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textView"
/>

I did some research and trial Updating answer based on question and your xml - Also correcting it

<Button
    android:id="@+id/On"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="8dp"
    android:layout_marginTop="92dp"
    android:text="Prender"
    app:layout_constraintEnd_toStartOf="@+id/Off"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textView"
<tag android:id="@+id/on_tag" android:value="1" />
</Button>

Just small change in getTag() instead view.getTag() will pass id as below.

btnOn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Log.e(TAG,String.valueOf(v.getTag(R.id.on_tag))); 
                }
            });

> In updated answer i.e tag as separate, we can have multiple Tag value
> assigned to a view. Sorry I forgot about tag because never
> used much, I generally set tag to view during run time only. but thanks to you and
> document

Kotlin code for same as below

 On.setOnClickListener(View.OnClickListener { v ->
            Log.e(
                FragmentActivity.TAG,
                v.getTag(R.id.on_tag)?.toString()
            )
        })

As I have used on_tag in id for tag. Also what you need is String, while getTag returns Object so converting it to string.