One button click event

Question

Consider the following layout of a Activity:

<LinearLayout>
    <android.support.v7.widget.AppCompatButton
        android:id="@+id/btnLogin"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:onClick="clickNoBotao"
        android:text="Login"/>
</LinearLayout>

Amending I:

Button mBotao = (Button) findViewById(R.id.btnCreateAccess);

mBotao.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        //Código aqui
    }
});

Amendment II:

public void clickNoBotao () {

        //Código aqui

}

Amendment III:

public void clickNoBotao (View view) {

        //Código aqui

}

Amendment IV:

Button mBotao = (Button) findViewById(R.id.btnCreateAccess);

mBotao.setOnClick(new View.OnClick() {
    @Override
    public void onClick(View view) {
        //Código aqui
    }
});

I wonder if these alternatives and the event code are in accordance with the code Linearlayout

Answer 1

the alternatives presented only to I and III are valid.

The class Button uses an interface implementation View.Onclicklistener to inform that the button has been clicked.

This implementation must be associated with the button via the method setOnClickListener().

The SDK provides the possibility of the method onClick() of the interface can be indicated in the xml, through the attribute android:onClick, and implemented in Activity.

The method to be implemented must have the same signature as the interface method: public void onClick(View view).
That’s why the alternative II is not valid.
The name can be different, as long as it is the same as in xml.

The alternative IV is also not valid because the Button class has no method called setOnClick().

Related: Advantage and advantage between onClick and setOnClickListener.