SettingsActivity.java

package com.chehanr.yako;

import android.content.Intent;
import android.os.Bundle;
import android.preference.PreferenceFragment;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;


public class SettingsActivity extends AppCompatActivity {

    @Override
    public void onBackPressed() {
        Intent myIntent = new Intent(SettingsActivity.this, MainActivity.class);
        myIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(myIntent);
        finish();
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_settings);

        if (getFragmentManager().findFragmentById(R.id.content_frame) == null) {
            getFragmentManager().beginTransaction().replace(R.id.content_frame, new SettingsFragment()).commit();
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == android.R.id.home) {
            onBackPressed();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    public static class SettingsFragment extends PreferenceFragment {
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.xml.settings);
        }
    }

}