呼叫onrestart / onresume当点击后退按钮 [英] call onrestart/onresume when click on back button

问题描述

晚上，

我现在面临一个小问题，我不能得到固定。我有一个'基地'活动：在这历史的数组列表（名称测试活动，延长的ActivityGroup ） 。当我去一个新的活动，我用下面的位加载一个新视图每次。

I'm facing a small problem which I can't get fixed. I'm having one 'base' activity (name: TestActivity, extending ActivityGroup) with a history array list in it. Every time when I'm going to a new activity I'm using the following bit to load a new view.

Intent intent = new Intent(Start.this, CitySelect.class);
View view = TestActivity.group.getLocalActivityManager().startActivity("cityselect", intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)).getDecorView();
TestActivity.group.replaceView(view); 

正如你可以看到我打电话 replaceView 方法替换的观点。见下面的code：

As you can see I'm calling the replaceView method to 'replace' the view. See below for the code:

public void replaceView(View v)
{
    history.add(v);
    setContentView(v);
}

在每一个活动，我重写 onBack pressed ：

In every activity I'm overriding the onBackPressed:

@Override
public void onBackPressed()
{
    TestActivity.group.back();
}

见下面的回方法：

public void back()
{
    if (history.size() > 0)
    {
        history.remove(history.size() - 1);

        if (history.size() > 0)
        {
            View v = history.get(history.size() - 1);
            setContentView(v);
        }

        else
        {
            finish();
        }
    }

    else
    {
        finish();
    }
} 

现在问题来了：当我用我的手机和previous活动上的后退按钮来到前台什么都不会在视图中（活动）被调用。当我按照活动的生活cyle我认为 onResume 将被调用，但事实并非如此。什么也没有发生。

Now comes the problem: when I'm using the back button on my phone and the previous activity comes to the foreground nothing will be called in the view (activity). When I follow the Activity life cyle I thought that the onResume will be called but that's not the case. Nothing happens.

所以，问题是：我怎么能叫 onResume 方法，当我pressing后退按钮

So the question is: How can I call the onResume method when I'm pressing the back button?

推荐答案

@Commonsware好心指出，（在我的另一篇文章）的活动组实际上已经去precated。我们应该被移动到对片段，而不是

@Commonsware kindly pointed out (in another post of mine) that ActivityGroups have actually been deprecated. We are supposed to be moving onto to Fragments, instead.

一直由同一个问题，因为你争夺的时间比我愿意承认。当你以后pressing后退按钮从的ActivityGroup内返回焦点视图的常用工具（OnResume，OnRestart）无工作。

Been battling with the same problem as you for longer than I care to admit. None of the commonly used tools (OnResume, OnRestart) work when you return the focus to a view from within an ActivityGroup after pressing the back button.

不幸的是，我还需要找到一种方法来的假的时候，从后退按钮后的ActivityGroup内为pressed（因为我投入巨资在这个传统$ C $的onResume C，它使用活动组。）在我的斗争。

Unfortunately, I still need to find a way to fake an onResume when the from within the ActivityGroup after the back button is pressed (since I am heavily invested in this legacy code that uses ActivityGroups.) On I struggle.

希望这有助于。

- 编辑 -

我发现了一个办法做到这一点：

I found a way to do this:

而不是保持意见的历史，保持启动活动的ID的历史。你开始每个活动都有一个与之关联的唯一ID。所以，当你回电话（），检索该活动的ID，并重新开始活动。这将触发您的活动的onResume（）方法，你的愿望。

Instead of keeping a history of the views, keep a history of the id's of the the activities you start. Every activity you start has a unique id associated with it. So, when you call back(), retrieve the activity's id, and start the activity anew. This will trigger your activity's "onResume()" method as you desire.

下面是我会怎样重组code您提供：
以下位加载新的观点：

Here is how I would restructure the code you provided: following bit to load a new view:

Intent intent = new Intent(Start.this, CitySelect.class);
View view =     TestActivity.group.getLocalActivityManager().startActivity("cityselect", intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)).getDecorView();
TestActivity.group.replaceView(view,"cityselect"); 

在内部更换视图replaceView（）方法：

Replacing the view within the "replaceView()" method:

public void replaceView(View v, String activityId)
{
    history.add(activityId);
    setContentView(v);
}

最后，从内部的ActivityGroup回（）方法：

And finally, the back() method from within the ActivityGroup:

public void back()
{
if (history.size() > 0)
{
    history.remove(history.size() - 1);

    if (history.size() > 0)
    {
        //View v = history.get(history.size() - 1);
        //setContentView(v);

       LocalActivityManager manager = getLocalActivityManager();
       String lastId = mIdList.get(history.size()-1);
       Intent lastIntent = manager.getActivity(lastId).getIntent();
       Window newWindow = manager.startActivity(lastId, lastIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP));
       setContentView(newWindow.getDecorView());

    }

    else
    {
        finish();
    }
}

else
{
    finish();
}

}

希望这有助于更多一点：）

Hope THIS helps a little more :)

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