Created
September 3, 2013 00:42
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An extensible FragmentPagerAdapter that supports both FragmentActivity and Fragment hosts.
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package you.should.change.this; | |
import android.content.Context; | |
import android.os.Bundle; | |
import android.support.v4.app.Fragment; | |
import android.support.v4.app.FragmentActivity; | |
import android.support.v4.app.FragmentPagerAdapter; | |
import android.support.v4.view.ViewPager; | |
import android.view.View; | |
import android.view.ViewGroup; | |
import android.widget.TabHost; | |
import android.widget.TabWidget; | |
import java.util.ArrayList; | |
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; | |
} | |
} | |
private 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 TabsAdapter(Fragment fragment, TabHost tabHost, ViewPager pager) { | |
super(fragment.getChildFragmentManager()); | |
mContext = fragment.getActivity(); | |
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); | |
Fragment f = Fragment.instantiate(mContext, info.clss.getName(), info.args); | |
return f; | |
} | |
@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) { | |
} | |
} |
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