ActionBar设置并响应返回事件

public class RegisterActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_register);getActionBar().setDisplayHomeAsUpEnabled(true);getActionBar().setDisplayShowHomeEnabled(false);getActionBar().setDisplayUseLogoEnabled(false);}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {switch (item.getItemId()) {case android.R.id.home:onBackPressed();break;default:break;}return super.onOptionsItemSelected(item);}}