How to implement the Android ActionBar back button?

Question

I have an activity with a listview. When the user click the item, the item \"viewer\" opens:

List1.setOnItemClickListener(new OnItemClickListener() {
    @Ov         


        

Answer 1

AndroidManifest file:

add in DetailsActivity:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);   
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}

it's work :]