注册界面的优化之ActionBar组件的应用之（二）ActionBar组件的事件处理

//Register_Activity.java

public class Register_Activity extends AppCompatActivity {
......
@Override
public boolean onOptionsItemSelected(MenuItem item) {
//判断系统回去的item
switch (item.getItemId()) {
case R.id.ab_return:

Intent intent = new Intent();
intent.setClass(Register_Activity.this, LoginActivity.class);
startActivity(intent);
finish();  //通知系统将该界面从内存中的栈中清除
break;
default:
break;
}
return true;
}
}