How to add a Back button on Activity

Wednesday, January 30, 2019

This is a useful tool, especial if you have a complex UI. the ability to go back to your previously opened Activity.

1. first you need to import the menuItem class on your opened Second Activity.

import android.view.MenuItem;

2. next add the following code under

public class SecondActivity extends AppCompatActivity {

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

        //add back button        getSupportActionBar().setDisplayShowHomeEnabled(true);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

3. now paste the follow code.

@Overridepublic boolean onOptionsItemSelected(MenuItem item){
    int id = item.getItemId();

    if(id == android.R.id.home){
          this.finish();
    }

    return super.onOptionsItemSelected(item);
}