如何调用从preferenceActivity特定preferenceFragment？ [英] How do I call a specific PreferenceFragment from a PreferenceActivity?

问题描述

我有几个片段一preferenceActivity：

R.xml preferences：（简称为更好的可读性）：

 ＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT; preference报头的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android＆GT;
    ＆LT;头安卓碎片=fragments.Fragment1机器人：ID =@ + ID /片段1[...] /＆GT;
    ＆LT;头安卓碎片=fragments.Fragment2机器人：ID =@ + ID / fragment2[...] /＆GT;
    [...]
＆LT; / preference报头＆GT;
 

SettingsActivity

 公共类SettingsActivity扩展preferenceActivity {
    @覆盖
    公共无效onBuildHeaders（名单＆LT;头＆GT;目标）{
        loadHeadersFromResource（R.xml preferences，目标）;
    }
}
 

这将显示一个列表条目 fragments.Fragment1 ， fragments.Fragment2 ，...如果 SettingsActivity 已启动。

但现在我想通过一个包，这样在启动活动时，一个特定的preferenceFragment打开：

所以我说这为 SettingsActivity

  @覆盖
公共无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;
    如果（savedInstanceState = NULL和放大器;！＆安培; savedInstanceState.getBoolean（快捷方式））{
        //直接跳到fragments.Fragment1
    }
}
 

我试图加载通过片段getFragmentManager（）。findFragmentById（R.id.fragment1），但这个回报率空。但是，即使我有正确的情况下，我不知道如何调用它。此外，调用 loadHeadersFromResource（R.xml preferences_fragment1，目标）; 不工作 - 这将抛出一个RuntimeException的 XML文件必须以标签;发现preferenceScreen在二进制XML文件的。我没有留下意见，也对SO和谷歌搜索没有找到任何相关的结果。

所以我的问题是：是否有可能直接从Activitiy的onCreate方法加载一个preferenceFragment（如fragments.Fragment1）？如果是这样，怎么样？

解决方案

据： <一href="http://developer.android.com/reference/android/$p$pference/$p$pferenceActivity.html#EXTRA_SHOW_FRAGMENT">http://developer.android.com/reference/android/$p$pference/$p$pferenceActivity.html#EXTRA_SHOW_FRAGMENT

  

公共静态最后弦乐EXTRA_SHOW_FRAGMENT

     

加在API级别11时启动该活动中，调用意向   可以包含这种额外的字符串来指定哪些片段要   初步显示出来。

     

常数值：：机器人：show_fragment

 意图=新的意图（这一点，SettingsActivity.class）;
intent.putExtra（preferenceActivity.EXTRA_SHOW_FRAGMENT，Fragment1.class.getName（））;
intent.putExtra（preferenceActivity.EXTRA_NO_HEADERS，真正的）;
 

I have a PreferenceActivity with several fragments:

R.xml.preferences: (shortened for better readability):

<?xml version="1.0" encoding="utf-8"?>
<preference-headers xmlns:android="http://schemas.android.com/apk/res/android">
    <header android:fragment="fragments.Fragment1" android:id="@+id/fragment1" [...] />
    <header android:fragment="fragments.Fragment2" android:id="@+id/fragment2" [...] />
    [...]
</preference-headers>

SettingsActivity:

public class SettingsActivity extends PreferenceActivity {
    @Override
    public void onBuildHeaders(List<Header> target) {
        loadHeadersFromResource(R.xml.preferences, target);
    }
}

This will show a list entry with fragments.Fragment1, fragments.Fragment2, ... if SettingsActivity is started.

But now I want to pass a Bundle such that a specific PreferenceFragment is opened when starting the activity:

so I added this to SettingsActivity:

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (savedInstanceState != null && savedInstanceState.getBoolean("shortcut")) {
        // directly jump to fragments.Fragment1
    }
}

I tried to load the fragment via getFragmentManager().findFragmentById(R.id.fragment1), but this returns null. But even if I had the correct instance, I would not know how to invoke it. Also, calling loadHeadersFromResource(R.xml.preferences_fragment1, target); does not work - This will throw a RuntimeException "XML document must start with tag; foundPreferenceScreen at Binary XML file". I have no ideas left and also a search on SO and Google did not return any relevant results.

So my question is: Is it possible to directly load a PreferenceFragment (e.g. fragments.Fragment1) from the Activitiy's onCreate method? If so, how?

解决方案

According to: http://developer.android.com/reference/android/preference/PreferenceActivity.html#EXTRA_SHOW_FRAGMENT

public static final String EXTRA_SHOW_FRAGMENT

Added in API level 11 When starting this activity, the invoking Intent can contain this extra string to specify which fragment should be initially displayed.

Constant Value: ":android:show_fragment"

intent = new Intent( this, SettingsActivity.class );
intent.putExtra( PreferenceActivity.EXTRA_SHOW_FRAGMENT, Fragment1.class.getName() );
intent.putExtra( PreferenceActivity.EXTRA_NO_HEADERS, true );

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