android返回主页时，Activity在后台继续运行的方法

android中实现应用程序的Activity按返回键时，不销毁该Activity，在后台继续运行

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
moveTaskToBack(false);
return true;
}
return super.onKeyDown(keyCode, event);
}

其中主要起作用的代码是：moveTaskToBack(false);这一行代码；

其API文档描述如下 ：

Move the task containing this activity to the back of the activity stack. The activity’s order within the task is unchanged.

参数：

nonRoot If false then this only works if the activity is the root of a task; if true it will work for any activity in a task.

返回：

If the task was moved (or it was already at the back) true is returned, else false.