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    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_settings);
        ActionBar actionBar = this.getSupportActionBar();
         // Set the action bar back button to look like an up button
        if (actionBar != null) {
            actionBar.setDisplayHomeAsUpEnabled(true);
        }
    }
     @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        // When the home button is pressed, take the user back to the VisualizerActivity
        if (id == android.R.id.home) {
            NavUtils.navigateUpFromSameTask(this);
        }
        return super.onOptionsItemSelected(item);
    }

myToolbar.setTitleTextColor(Color.WHITE);
        if (userCurrent != null) {
            myToolbar.setTitle(userCurrent.getShop().title);
        }
        setSupportActionBar(myToolbar);

        if (getSupportActionBar() != null) {
            getSupportActionBar().setDisplayHomeAsUpEnabled(true);
            getSupportActionBar().setDisplayShowHomeEnabled(true);
        }
        
        ///
        
            @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        return super.onCreateOptionsMenu(menu);
    }

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

    <android.support.v7.widget.Toolbar
        android:id="@+id/my_toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        android:elevation="4dp"
        app:theme="@style/ThemeOverlay.AppCompat"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />