TabHost mit ViewPager in einem Fragment

TheMs · 22. Januar 2014

Hallo Leute ,
ich habe eine Frage, und zwar:
ich habe ein Projekt mit SideNavigationBar - wie's eben der Projekt-Konfigurator ermöglicht - und in einem Fragment, das bei einem Item dieser NavigationBar, möchte ich ein TabHost platzieren. Das hat eigentlich auch fast ganz gut geklappt, aber leider nur fast:
Beim ersten Aufrufen dieses Items läuft alles wie geplant (Anhang 1), bei erneutem Aufrufen wird aber in den Tabs nichts mehr angezeigt (Anhang 2).
Kann mir jemand einen Tipp geben - oder ein Beispielprojekt mit einer Lösung erstellen?

Wäre sseeeehr dankbar.

Hier mal meine Codes:

erstmal fragment_tabhost.xml

HTML

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;


import java.util.List;


/**
 * Created by Michael on 22.01.14.
 */
public class PagerAdapter extends FragmentPagerAdapter{


	private List&lt;Fragment&gt; fragments;


	public PagerAdapter(FragmentManager fm, List&lt;Fragment&gt; fragments) {
    	super(fm);
    	this.fragments = fragments;
	}


	@Override
	public Fragment getItem(int position) {
    	return this.fragments.get(position);
	}


	@Override
	public int getCount() {
    	return this.fragments.size();
	}
}

Alles anzeigen

dann TabHostFragment.java:

Java

package thems.vertretungsplan;


import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.Locale;
import java.util.Vector;


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.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TabHost;
import android.widget.TabHost.TabContentFactory;
import android.widget.TextView;


import thems.vertretungsplan.R;




public class TabHostFragment extends Fragment implements TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener {


	private TabHost mTabHost;
	private ViewPager mViewPager;
	private PagerAdapter mPagerAdapter;
	private HashMap&lt;String, TabInfo&gt; mapTabInfo = new HashMap&lt;String, TabInfo&gt;();
	private FragmentManager fragmentManager;


	public TabHostFragment(FragmentManager fragmentManager) {
    	this.fragmentManager = fragmentManager;
	}


	private class TabInfo {
    	private String tag;
    	private Class&lt;?&gt; clss;
    	private Bundle args;
    	private Fragment fragment;
    	TabInfo(String tag, Class&lt;?&gt; clazz, Bundle args) {
        	this.tag = tag;
        	this.clss = clazz;
        	this.args = args;
    	}


	}


	class TabFactory implements TabContentFactory {


    	private final Context mContext;


    	public TabFactory(Context context) {
        	mContext = context;
    	}


    	public View createTabContent(String tag) {
        	View v = new View(mContext);
        	v.setMinimumWidth(0);
        	v.setMinimumHeight(0);
        	return v;
    	}


	}


	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    	View view = inflater.inflate(R.layout.fragment_tabhost, container, false);


    	initialiseTabHost(savedInstanceState, view);
    	if (savedInstanceState != null) {
        	mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab")); //set the tab as per the saved state
    	}
    	this.intialiseViewPager(view);


    	return view;
	}


	private void intialiseViewPager(View view) {


    	List&lt;Fragment&gt; fragments = new Vector&lt;Fragment&gt;();
    	fragments.add(PlaceholderFragment.newInstance(1));
    	fragments.add(PlaceholderFragment.newInstance(2));
    	this.mPagerAdapter  = new thems.vertretungsplan.PagerAdapter(fragmentManager, fragments);


    	this.mViewPager = (ViewPager)view.findViewById(R.id.viewpager);
    	this.mViewPager.setAdapter(this.mPagerAdapter);
    	this.mViewPager.setOnPageChangeListener(this);
	}


	private void initialiseTabHost(Bundle args, View view) {
    	mTabHost = (TabHost) view.findViewById(android.R.id.tabhost);
    	mTabHost.setup();
    	TabInfo tabInfo = null;
    	AddTab((MainActivity)getActivity(), this.mTabHost, this.mTabHost.newTabSpec("Tab1").setIndicator("Tab 1"), ( tabInfo = new TabInfo("Tab1", PlaceholderFragment.class, args)));
    	this.mapTabInfo.put(tabInfo.tag, tabInfo);


    	AddTab((MainActivity)getActivity(), this.mTabHost, this.mTabHost.newTabSpec("Tab2").setIndicator("Tab 2"), ( tabInfo = new TabInfo("Tab2", PlaceholderFragment.class, args)));
    	this.mapTabInfo.put(tabInfo.tag, tabInfo);


    	mTabHost.setOnTabChangedListener(this);
	}


	private void AddTab(MainActivity activity, TabHost tabHost, TabHost.TabSpec tabSpec, TabInfo tabInfo) {
    	tabSpec.setContent(new TabFactory(activity));
    	tabHost.addTab(tabSpec);
	}


	@Override
	public void onTabChanged(String tag) {
    	//TabInfo newTab = this.mapTabInfo.get(tag);
    	int pos = this.mTabHost.getCurrentTab();
    	this.mViewPager.setCurrentItem(pos);
	}


	@Override
	public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
    	// TODO Auto-generated method stub


	}


	@Override
	public void onPageSelected(int position) {
    	// TODO Auto-generated method stub
    	this.mTabHost.setCurrentTab(position);
	}


	@Override
	public void onPageScrollStateChanged(int i) {


	}






	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
    	// Handle action bar item clicks here. The action bar will
    	// automatically handle clicks on the Home/Up button, so long
    	// as you specify a parent activity in AndroidManifest.xml.
    	int id = item.getItemId();
    	if (id == R.id.action_settings) {
        	return true;
    	}
    	return super.onOptionsItemSelected(item);
	}


	public static class PlaceholderFragment extends Fragment {
    	/**
     	* The fragment argument representing the section number for this
     	* fragment.
     	*/
    	private static final String ARG_SECTION_NUMBER = "section_number";


    	/**
     	* Returns a new instance of this fragment for the given section
     	* number.
     	*/
    	public static PlaceholderFragment newInstance(int sectionNumber) {
        	PlaceholderFragment fragment = new PlaceholderFragment();
        	Bundle args = new Bundle();
        	args.putInt(ARG_SECTION_NUMBER, sectionNumber);
        	fragment.setArguments(args);
        	return fragment;
    	}


    	public PlaceholderFragment() {
    	}


    	@Override
    	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        	View rootView = inflater.inflate(R.layout.fragment_main, container, false);
        	TextView textView = (TextView) rootView.findViewById(R.id.section_label);
        	textView.setText(Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER)));
        	return rootView;
    	}
	}


}

Alles anzeigen

TabHost mit ViewPager in einem Fragment

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