how to open a new activity on spinner dropdown click

I think You can do it like this:

import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Spinner; import androidx.appcompat.app.AppCompatActivity; import java.util.ArrayList; public class MainActivity extends AppCompatActivity { Spinner spinner; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ArrayList<String> activityList = new ArrayList<>(); // list of string which will be added to Spinner activityList.add("Select Activity"); activityList.add("Activity 1"); activityList.add("Activity 2"); spinner = findViewById(R.id.spinner); spinner.setAdapter(new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, activityList )); spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) { Log.i("MyTag", "Item selected at position " + i); if (i==0) // check position of selected item and open activity { // do nothing } else if (i==1) { openActivity(NewActivity.class); } else { openActivity(NewActivitySecond.class); } } @Override public void onNothingSelected(AdapterView<?> adapterView) { } }); } private void openActivity(Class x) //funtion which opens activity { Intent intent = new Intent(this, x); startActivity(intent); } }