package com.yeliheng.metaldetector; import androidx.fragment.app.Fragment; import androidx.fragment.app.FragmentTransaction; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; public class SettingsActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_settings); Fragment preferenceFragment = new SettingsFragment(); FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); ft.add(R.id.pref_container, preferenceFragment); ft.commit(); } }