显示上行按钮的动作条在子屏幕preferences [英] Show up-Button in actionBar in subscreen preferences

问题描述

我实现了我的preferences一样显示在官方的指导方针。

I've implemented my preferences like shown in the official guidelines.

我有一个preferenceActivity创造了preferenceFragment是这样的：

I have a PreferenceActivity which creates the PreferenceFragment like this:

 @Override
 protected void onCreate(Bundle savedInstanceState) 
 {
      super.onCreate(savedInstanceState);

      Bundle extras = getIntent().getExtras();
      if (extras != null) 
      {
          Bundle bundle = new Bundle();
          _widgetID = extras.getInt(GlobalSettings.EXTRA_WIDGET_ID); 
          bundle.putInt(GlobalSettings.EXTRA_WIDGET_ID, _widgetID);

          WidgetSettingsFragment fragment = new WidgetSettingsFragment();
          fragment.setArguments(bundle);

          getFragmentManager().beginTransaction().replace(android.R.id.content,
                        fragment).commit();
      }

 }

在preferenceFragment加载从资源preferences，它们含有preference子屏幕是这样的：

The PreferenceFragment loads the preferences from the resources and they contain a preference subscreen like this:

<PreferenceScreen  xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- opens a subscreen of settings -->
    <PreferenceScreen
        android:key="button_voicemail_category_key"
        android:title="@string/voicemail"
        android:persistent="false">
        <ListPreference
            android:key="button_voicemail_provider_key"
            android:title="@string/voicemail_provider" ... />
        <!-- opens another nested subscreen -->
        <PreferenceScreen
            android:key="button_voicemail_setting_key"
            android:title="@string/voicemail_settings"
            android:persistent="false">
            ...
        </PreferenceScreen>
        <RingtonePreference
            android:key="button_voicemail_ringtone_key"
            android:title="@string/voicemail_ringtone_title"
            android:ringtoneType="notification" ... />
        ...
    </PreferenceScreen>
    ...
</PreferenceScreen>

这工作得很好，到目前为止，但现在我想有一个上行按钮的动作条的preferences子屏幕显示时。任何想法如何实现这一目标？

This works well so far, but now I'd like to have an up-Button in the actionBar when the preferences subscreen is shown. Any idea how to accomplish that?

我已经尝试设置 setDisplayHomeAsUpEnabled（真）在我的活动，但随后向上按钮只在主preferences所示（它不应该）而不是在子屏幕。

I have tried to set setDisplayHomeAsUpEnabled(true) in my activity but then the up-Button is only shown in the main preferences (where it should not) and not in the subscreen.

我不知道，即使是在官方的文档的子屏幕显示不存在活跃上行按钮：

I'm wondering that even in the official docs the subscreen is shown without an active up-Button:

链接到文档：设置

任何帮助是非常欢迎的。

Any help is really welcome

推荐答案

我终于得到它的工作：D。这是相当哈克，但它的工作原理。

I finally got it to work :D. It's quite hacky but it works.

的问题是，使用XML-布局结果subscreens在一些'code魔力'。 开始的子屏幕的新活动/对话框，你不必直接访问它。

The problem is, that using subscreens in xml-layouts results in some 'code magic'. A new activity/dialog is started for the subscreen and you don't have direct access to it.

要访问该动作条和家庭/上行按钮，你需要得到引用你的preferenceScreen，并得到其母公司对话，以访问动作条和家庭/向上按钮的OnClickListener

To get access to the actionbar and the OnClickListener of the home/up-button you need to get a reference to your PreferenceScreen and get its parent Dialog in order to access the actionbar and its home/up button.

这是它是如何在我的preferenceFragment完成的：

This is how it is done inside my PreferenceFragment:

 @Override
 public void onCreate(Bundle savedInstanceState) 
 {
...

 final PreferenceScreen preferenceScreen = (PreferenceScreen) findPreference(getString(R.string.keyPrefScreenDynamicWidgetDetails));
  preferenceScreen.setOnPreferenceClickListener(new OnPreferenceClickListener() 
  {
       public boolean onPreferenceClick(Preference preference) 
       {
           preferenceScreen.getDialog().getActionBar().setDisplayHomeAsUpEnabled(true);
           final Dialog dialog = preferenceScreen.getDialog();

           View homeBtn = dialog.findViewById(android.R.id.home);
           if (homeBtn != null) 
           {
               OnClickListener dismissDialogClickListener = new OnClickListener()
               {
                   @Override
                   public void onClick(View v) 
                   {
                      dialog.dismiss();
                   }
               };

               // Prepare yourselves for some hacky programming
               ViewParent homeBtnContainer = homeBtn.getParent();

               // The home button is an ImageView inside a FrameLayout
               if (homeBtnContainer instanceof FrameLayout) {
                   ViewGroup containerParent = (ViewGroup) homeBtnContainer.getParent();

                   if (containerParent instanceof LinearLayout) {
                       // This view also contains the title text, set the whole view as clickable
                       ((LinearLayout) containerParent).setOnClickListener(dismissDialogClickListener);
                   } else {
                       // Just set it on the home button
                       ((FrameLayout) homeBtnContainer).setOnClickListener(dismissDialogClickListener);
                   }
               } else {
                   // The 'If all else fails' default case
                   homeBtn.setOnClickListener(dismissDialogClickListener);
               }                   
           }
           return true;
       }
  });
...

}

下面的链接给了我最后的提示和code，以解决我的问题：

Following link gave me the final hints and code to solve my problem:

<一个href="http://stackoverflow.com/questions/16374820/action-bar-home-button-not-functional-with-nested-$p$pferencescreen">Action酒吧主页按钮不起作用嵌套preferenceScreen

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