我知道这已经被问早前这里 ＆放大器; here太。他们都没有回答正确（或没有回答所有）。可是，我不知道为什么 moveTaskToBack（真）; 总是为我返回false 。可谁能告诉我，为什么和我怎么能解决这个问题？先谢谢了。

I know this has been asked earlier here & here too.They are not answered properly (or not answered at all).But,i don't know why moveTaskToBack(true); always returns false for me .Can anyone tell me why and how could i solve the issue? Thanks in advance.

public void onBackPressed() {       
    boolean r=  moveTaskToBack(true);
    //r is false !! using API LEVEL 8
}

注：从我打电话是一个孩子活动包含在 tabActivity 既不的活动这是一个主要或 LAUNCHER activity.I不知道是否有差别。

Note:The activity from which i am calling it is a child Activity included in a tabActivity and neither of this is a MAIN or LAUNCHER activity.I don't know if that makes a difference.

编辑： 其结果是应用程序一点儿也不去background.I希望它去的背景，就像硬件HOME是pressed

and as a result the application does'nt go to background.I want it to go to background just as if the hardware HOME is pressed

推荐答案

我不知道为什么 moveTaskToBack（真）将返回假为您服务。也许，在你的表现很奇怪？无论如何，你可以做到这一点，而不是调出主屏幕：

I don't know why moveTaskToBack(true) is returning false for you. Perhaps there's something weird in your manifest? At any rate, you can do this instead to bring up the home screen:

Intent i = new Intent();
i.setAction(Intent.ACTION_MAIN);
i.addCategory(Intent.CATEGORY_HOME);
this.startActivity(i);

不过，要注意的此消息：

你不能模拟上的Home键preSS。 ＆mdash;罗马盖伊，Android框架工程师

"You cannot simulate a press on the Home key." — Roman Guy, Android framework engineer

我不知道怎么说我的建议的code平方（这是我发现在同一个线程罗马的声明，似乎工作）。

I'm not sure how that squares with my suggested code (which I found on the same thread as Roman's statement and seems to work).