Android – how to set buttons outside listview

In my activity, I have a list view and a button. Each has a different purpose

My list view shows the details of an item in another activity

My button opens another activity

There is no problem with listview here. But my button doesn't work

In my code, I have used the following examples for listview and button

    public class MainActivity extends AppCompatActivity implements ListView.OnItemClickListener{

   private Button buttonaddticket;

    private ListView listView;
     @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.MainActivity );

            listView = (ListView) findViewById(R.id.srListView);

            listView.setOnItemClickListener(this);

            buttonaddticket = (Button) findViewById(R.id.btnaddticket);

            //Setting listeners to button
            buttonaddticket.setOnClickListener((View.OnClickListener) this);

        }
        .
        .
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        Intent intent = new Intent(this, SingleTicket.class);
        .
        }


    public void onClick(View v) {
        if(v == buttonaddticket){
        .
        .
        }
    }
        }

The question is how to implement onclicklistener for buttons in the same activity?

resolvent:

You can implement multiple listeners for your activity

public class MainActivity extends AppCompatActivity implements ListView.OnItemClickListener,View.OnClickListener{

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
         // handle listview on item click
    }

    @Override
    public void onClick(View view){
         switch (view.getId()){
                    //handle multiple view click events
         }
    }

}