[英]Using PreferenceFragment in SherlockFragmentActivity with tabs
I am trying to make a tabbed activity using ABS SherlockFragmentActivity with a ViewPager, and would like to have one of the tabs to contain a preference activity/fragment. 我正在尝试使用带有ViewPager的ABS SherlockFragmentActivity进行选项卡式活动,并希望其中一个选项卡包含首选项活动/片段。
As ABS does not have a SherlockPreferenceFragment, or any kind of support for PreferenceFragment, I found a possible solution using UnifiedPreference 由于ABS没有SherlockPreferenceFragment或PreferenceFragment的任何支持,我找到了使用UnifiedPreference的可能解决方案
UnifiedPreference works on it's own, demo works great, but if I try to implement it in my ActionBarSherlock powered tabs, it crashes with the message: UnifiedPreference可以自己运行,演示效果很好,但是如果我尝试在我的ActionBarSherlock驱动的选项卡中实现它,它会崩溃并显示以下消息:
04-18 03:59:26.000: E/AndroidRuntime(8437): FATAL EXCEPTION: main
04-18 03:59:26.000: E/AndroidRuntime(8437): java.lang.ClassCastException: si.neanonimen.Settings$NetSettingsPrefsFragment cannot be cast to android.support.v4.app.Fragment
04-18 03:59:26.000: E/AndroidRuntime(8437): at android.support.v4.app.Fragment.instantiate(Fragment.java:384)
It looks like UnifiedPreferenceFragment
does not extend android.support.v4.app.Fragment
. 看起来
UnifiedPreferenceFragment
不会扩展android.support.v4.app.Fragment
。 Is there any way around this? 有没有办法解决? Has anyone managed to get a working example?
有没有人设法得到一个有效的例子?
My current code is: 我目前的代码是:
Settings: 设置:
public class Settings extends UnifiedSherlockPreferenceActivity {
public static String tag = "Settings";
@Override
public void onCreate(Bundle savedInstanceState) {
setHeaderRes(R.xml.pref_headers);
super.onCreate(savedInstanceState);
}
public static class NetSettingsPrefsFragment extends UnifiedPreferenceFragment {}
}
Tabbed activity: 标签活动:
public class FragmentTabs extends SherlockFragmentActivity {
private TabHost mTabHost;
private ViewPager mViewPager;
private TabsAdapter mTabsAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_tabs);
mTabHost = (TabHost) findViewById(android.R.id.tabhost);
mTabHost.setup();
mViewPager = (ViewPager) findViewById(R.id.pager);
mTabsAdapter = new TabsAdapter(this, mTabHost, mViewPager);
// obviously THIS is the problem
mTabsAdapter.addTab(mTabHost.newTabSpec("settings").setIndicator("Nastavitve"), Settings.NetSettingsPrefsFragment.class, null);
if (savedInstanceState != null) {
mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab"));
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putString("tab", mTabHost.getCurrentTabTag());
}
public static class TabsAdapter extends FragmentPagerAdapter implements TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener {
private final Context mContext;
private final TabHost mTabHost;
private final ViewPager mViewPager;
private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
static final class TabInfo {
//private final String tag;
private final Class<?> clss;
private final Bundle args;
TabInfo(String _tag, Class<?> _class, Bundle _args) {
//tag = _tag;
clss = _class;
args = _args;
}
}
static class DummyTabFactory implements TabHost.TabContentFactory {
private final Context mContext;
public DummyTabFactory(Context context) {
mContext = context;
}
@Override
public View createTabContent(String tag) {
View v = new View(mContext);
v.setMinimumWidth(0);
v.setMinimumHeight(0);
return v;
}
}
public TabsAdapter(FragmentActivity activity, TabHost tabHost, ViewPager pager) {
super(activity.getSupportFragmentManager());
mContext = activity;
mTabHost = tabHost;
mViewPager = pager;
mTabHost.setOnTabChangedListener(this);
mViewPager.setAdapter(this);
mViewPager.setOnPageChangeListener(this);
}
public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args) {
tabSpec.setContent(new DummyTabFactory(mContext));
String tag = tabSpec.getTag();
TabInfo info = new TabInfo(tag, clss, args);
mTabs.add(info);
mTabHost.addTab(tabSpec);
notifyDataSetChanged();
}
@Override
public int getCount() {
return mTabs.size();
}
@Override
public Fragment getItem(int position) {
TabInfo info = mTabs.get(position);
return Fragment.instantiate(mContext, info.clss.getName(), info.args);
}
@Override
public void onTabChanged(String tabId) {
int position = mTabHost.getCurrentTab();
mViewPager.setCurrentItem(position);
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}
@Override
public void onPageSelected(int position) {
// Unfortunately when TabHost changes the current tab, it kindly
// also takes care of putting focus on it when not in touch mode.
// The jerk.
// This hack tries to prevent this from pulling focus out of our
// ViewPager.
TabWidget widget = mTabHost.getTabWidget();
int oldFocusability = widget.getDescendantFocusability();
widget.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
mTabHost.setCurrentTab(position);
widget.setDescendantFocusability(oldFocusability);
}
@Override
public void onPageScrollStateChanged(int state) {}
}
}
I also need to implement a PreferenceFragment in Android versions prior to Honeycomb (API level 11). 我还需要在Honeycomb之前的Android版本中实现PreferenceFragment(API级别11)。 As you already have, I found UnifiedPreference library but looking at the source code I see that the UnifiedPreferenceFragment extends the PreferenceFragment from the official Android API, thus not working for < API level 11.
正如您已经拥有的那样,我找到了UnifiedPreference库,但是查看源代码,我看到UnifiedPreferenceFragment从官方Android API扩展了PreferenceFragment,因此不适用于<API level 11。
This is another class I've found out there, but I haven't tested it yet: 这是我在那里找到的另一个课程,但我还没有测试过:
Hope it helps! 希望能帮助到你!
Have you found another solution? 你找到了另一个解决方案? Hopefully the Android folk will add this class to the support library soon!
希望Android用户很快将这个类添加到支持库中!
Cheers, 干杯,
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