BaseSampleActivity.java

package com.codetroopers.betterpickers.sample.activity;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;

public abstract class BaseSampleActivity extends AppCompatActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                finish();
                return true;
        }
        return true;
    }
}