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ActionBar 上端按钮和导航模式
原标题:ActionBar Up button and Navigation pattern

我想在我的 ActionBar 上按钮应用程序中执行 Navigation 模式

我有详细活动, 这里我可以从家、 最喜爱的和搜索的屏幕中找到。 我也可以从浏览器( 处理特定的 URL) 打开这个屏幕。 当用户按下 Up 按钮时, 我使用 flow () 方法来模仿回溯导航 。 但是, 如果用户来自浏览器, 我想打开家屏幕, 而不是以前的浏览器活动 。 我如何辨别先前的活动来自另一个应用程序, 并浏览到家屏幕?

最佳回答

向上应总是向活动上级航行,向上应始终向上,向后应始终从时间角度航行。

换句话说,你应该像现在这样离开"回去"

至于Up, 它应该总是去同一个地方, 无论它来自何处。 所以如果通常您从您的 Listactivity 到细节活动, Up应该总是去那里, 无论您从何而来。 最可能的地方由您自行决定, 但是它应该永远是相同的。

如果您从非正常地点( 如浏览器、 其它活动、 部件或通知) 来到“ 细节活动 ”, 您应该重新创建您的任务堆, 从而在导航中使用同一路径的结果。 以下是Android Developmenter training 中的例子 :

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case android.R.id.home:
        Intent upIntent = new Intent(this, YourListActivity.class);
        if (NavUtils.shouldUpRecreateTask(this, upIntent)) {
            // This activity is not part of the application s task, so
            // create a new task
            // with a synthesized back stack.
            TaskStackBuilder
                    .from(this)
                    .addNextIntent(new Intent(this, HomeActivity.class))
                    .addNextIntent(upIntent).startActivities();
            finish();
        } else {
            // This activity is part of the application s task, so simply
            // navigate up to the hierarchical parent activity.
            NavUtils.navigateUpTo(this, upIntent);
        }
        return true;
    }
}

这是关于实施导航的Android培训

(http://developmenter.android.com/training/ implementing-navigation/index.html )。

您需要 NavUtils 和 TaskStackBuilder 的支持库。

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