How to add a back button in the top corner on Android?

Question

How do you create a back button in the top left corner that allows you to go to the previous activity in android?

Answer 1

Found an answer here at
https://stackoverflow.com/questions/14545139/android-back-button-in-the-title-bar

Need to add these methods

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

public boolean onCreateOptionsMenu(Menu menu) {
    return true;
}

And put this line in the oncreate method
getSupportActionBar().setDisplayHomeAsUpEnabled(true);

Answer 2

I would think just drag the button to the top?