ViewPager でABS SherlockFragmentActivity を使用してタブ付きアクティビティを作成しようとしていますが、タブの 1 つに設定アクティビティ/フラグメントを含めたいと考えています。
ABS には SherlockPreferenceFragment や PreferenceFragment のサポートがないため、UnifiedPreferenceを使用して可能な解決策を見つけました。
UnifiedPreference は単独で動作し、デモはうまく機能しますが、ActionBarSherlock を使用したタブに実装しようとすると、次のメッセージでクラッシュします。
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)
UnifiedPreferenceFragment
伸びないようandroid.support.v4.app.Fragment
です。これを回避する方法はありますか?誰かが実際の例を得ることができましたか?
私の現在のコードは次のとおりです。
設定:
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 {}
}
タブ付きアクティビティ:
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) {}
}
}