android返回HOME界面

android 中如何返回HOME界面，相当于按下HOME key

                Intent mHomeIntent = new Intent(Intent.ACTION_MAIN);

                mHomeIntent.addCategory(Intent.CATEGORY_HOME);
                mHomeIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                                | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
                startActivity(mHomeIntent);