TaskerInitActivity.java

package treehou.se.habit.tasker;

import android.app.Activity;
import android.support.v7.app.ActionBar;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;

import treehou.se.habit.R;

public class TaskerInitActivity extends AppCompatActivity {

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

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);

        setSupportActionBar(toolbar);
        ActionBar actionbar = getSupportActionBar();
        if(actionbar != null) {
            actionbar.setDisplayHomeAsUpEnabled(true);
            actionbar.setHomeButtonEnabled(true);
        }

        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.container, new ActionSelectFragment())
                    .commit();
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            // Respond to the action bar's Up/Home button
            case android.R.id.home:
                if(getSupportFragmentManager().getBackStackEntryCount() >= 1){
                    getSupportFragmentManager().popBackStack();
                }else {
                    setResult(Activity.RESULT_CANCELED);
                    finish();
                }
                return true;
        }
        return super.onOptionsItemSelected(item);
    }
}