请行动起来吧＆QUOT;向上导航＆QUOT;触发dialogfragment

问题描述

我可以操作栏中的向上导航触发确认dialogfragment，说：你确定你想回去吗？

Can I make the action bar's "up" navigation trigger a confirmation dialogfragment that says "Are you sure you would like to go back?"

推荐答案

截获最高动作条按钮preSS是微不足道的，因为一切都是通过<$ C $完成C> onOptionsItemSelected 。该文档，建议您使用机器人。 R.id.home 去了 NavUtils （前提是你设置的元数据父活动让 NavUtils 不抛出异常等）：

Intercepting the up ActionBar button press is trivial because everything is done through onOptionsItemSelected. The documentation, recommends that you use android.R.id.home to go up with NavUtils (provided that you set the metadata for the parent activity so NavUtils doesn't throw an Exception, etc):

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    // Respond to the action bar's Up/Home button
    case android.R.id.home:
        NavUtils.navigateUpFromSameTask(this);
        return true;
    }
    return super.onOptionsItemSelected(item);
}

您 DialogFragment 应该提供一个确认实际回去。既然你现在正与片段，而不是活动，你会想通过 getActivity（）到 NavUtils 。

Your DialogFragment should offer an confirmation to actually go back. Since you're now working with the Fragment and not the Activity, you're going to want to pass getActivity() to NavUtils.

NavUtils.navigateUpFromSameTask(getActivity());

和变化 onOptionsItemSelected（）到

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    // Respond to the action bar's Up/Home button
    case android.R.id.home:
        new ConfirmationDialog().show(getSupportFragmentManager(), "confirmation_dialog");
        return true;
    }
    return super.onOptionsItemSelected(item);
}

ConfirmationDialog 是您的自定义 DialogFragment 。

注意，在这个例子中，我使用了支持 片段的API ,.如果你不是，请确保更改 getSupportFragmentManager（）到 getFragmentManager（）。

Note that for this example, I am using the support Fragment APIs,. If you are not, make sure to change getSupportFragmentManager() to getFragmentManager().

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