Why does the button to be clicked twice to work?

Question

Only on 2nd click the button loads the new activity.

Usually this problem happens often when I define an onCLick() method in the .xml and also have it in the activity. This is here not the case.

        <Button
            android:id="@+id/settingsBtn"
            android:layout_width="192dp"
            android:layout_height="60dp"
            android:layout_above="@+id/exitBtn"
            android:layout_alignParentStart="true"
            android:layout_alignParentEnd="true"
            android:layout_gravity="end|bottom"
            android:layout_marginStart="-2dp"
            android:layout_marginEnd="2dp"
            android:layout_marginBottom="24dp"
            android:background="@android:color/black"
            android:focusable="true"
            android:focusableInTouchMode="true"
            android:text="@string/settings"
            android:textColor="@android:color/white"
            android:textSize="24sp" />

private Button mSettingsButton;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
               .
               .
               .
        connectUiElements();
        setUpUiListeners();
}
.
.
.
private void connectUiElements() {
    mSettingsButton = (Button) findViewById(R.id.settingsBtn);
}

private void setUpUiListeners() {
            mSettingsButton.setOnClickListener(
                new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Intent intent = new Intent(getApplicationContext(), 
                                                   SettingsActivity.class);

                        startActivity(intent);
                    }
                }
        );
}

Usually I would expect, that the buttons works when I click once.