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POHow to update-refresh Fragment in ViewPager by Main Activity programmatically
 

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  1. POHow to update-refresh Fragment in ViewPager by Main Activity programmatically
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    <p>I'm building an App that use Fragment and a single <code>MainActivity</code> that showing different fragments in the same ViewPager to replicate the behaviour of a typical MVC application.</p> <p>The problem is that haven't understood how could I update the fragment programmatically to update the <code>ViewPager</code> with the new Fragment changes</p> <p>For example I have this <code>Fragment</code> that show a chart, (in my intention) when I invoke <code>setFragment(int interval, Point[] snodePoint)</code> from the main, the chart should be updated in <code>ViewPager</code></p> <pre><code>public class LineFragment extends Fragment { static int interval; static Point snodePoints[]; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { final View v = inflater.inflate(R.layout.fragment_linegraph, container, false); Bundle bundle = this.getArguments(); ChartConfig cg = bundle.getParcelable("FragmentData"); snodePoints = cg.getPoints(); interval= cg.getInterval(); Line l = new Line(); for(int i=0; i&lt;snodePoints.length; i++){ LinePoint p = new LinePoint(); Point sp=snodePoints[i]; p.setX(sp.getX()); p.setY(sp.getY()); l.addPoint(p) } l.setColor(getResources().getColor(R.color.green)); LineGraph li = (LineGraph) v.findViewById(R.id.linegraph); li.addLine(l); li.setRangeY(0, interval); li.setLineToFill(0); li.setOnPointClickedListener(new OnPointClickedListener() { @Override public void onClick(int lineIndex, int pointIndex) { // TODO Auto-generated method stub } }); return v; } } </code></pre> <p>In few words I need to </p> <ul> <li>1-create a fragment based on the data received by the main activity. </li> <li>2-change the data of the fragment everytime in the main activity happens something like setFragment(...) with new data (generated always by the main).</li> </ul> <p>How could I do this?</p> <p>The Main Activity with the FragmentAdapter</p> <pre><code>public class MainActivity extends FragmentActivity { ViewPager mViewPager; MyFragmentAdapter mMyFragmentAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mViewPager = (ViewPager) findViewById(R.id.view_pager); final ActionBar bar = this.getActionBar(); bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); LineFragment lineFrag = new LineFragment(); BarFragment barFrag = new BarFragment(); PieFragment pieFrag = new PieFragment(); mMyFragmentAdapter = new MyFragmentAdapter(this, mViewPager); mMyFragmentAdapter.addTab(bar.newTab().setText("Line"), LineFragment.class, null, lineFrag); mMyFragmentAdapter.addTab(bar.newTab().setText("Bar"), BarFragment.class, null, barFrag); mMyFragmentAdapter.addTab(bar.newTab().setText("Pie"), PieFragment.class, null, pieFrag); mViewPager.setOffscreenPageLimit(mMyFragmentAdapter.getCount() - 1); } public static class MyFragmentAdapter extends FragmentStatePagerAdapter implements ActionBar.TabListener, ViewPager.OnPageChangeListener { private final MainActivity mContext; private final ActionBar mActionBar; private final ViewPager mViewPager; private final ArrayList&lt;TabInfo&gt; mTabs = new ArrayList&lt;TabInfo&gt;(); private final ArrayList&lt;Fragment&gt; mFrag = new ArrayList&lt;Fragment&gt;(); static final class TabInfo { private final Class&lt;?&gt; clss; private final Bundle args; TabInfo(Class&lt;?&gt; _class, Bundle _args) { clss = _class; args = _args; } } public MyFragmentAdapter(MainActivity activity, ViewPager pager) { super(activity.getSupportFragmentManager()); mContext = activity; mActionBar = activity.getActionBar(); mViewPager = pager; mViewPager.setAdapter(this); mViewPager.setOnPageChangeListener(this); } public void addTab(ActionBar.Tab tab, Class&lt;?&gt; clss, Bundle args, Fragment frag) { TabInfo info = new TabInfo(clss, args); tab.setTag(info); tab.setTabListener(this); mTabs.add(info); mFrag.add(frag); mActionBar.addTab(tab); notifyDataSetChanged(); } @Override public int getCount() { return mTabs.size(); } @Override public Fragment getItem(int position) { TabInfo info = mTabs.get(position); Bundle args = new Bundle(); ChartConfig cg = new ChartConfig(interval, snodePoint); args.putParcelable("FragmentData", cg); Fragment f = mFrag.get(position); f.setArguments(args); return f; } @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { mActionBar.setSelectedNavigationItem(position); } @Override public void onPageScrollStateChanged(int state) { } public void onTabSelected(Tab tab, android.app.FragmentTransaction ft) { Object tag = tab.getTag(); for (int i = 0; i &lt; mTabs.size(); i++) { if (mTabs.get(i) == tag) { mViewPager.setCurrentItem(i); } } } public void onTabUnselected(Tab tab, android.app.FragmentTransaction ft) { } @Override public void onTabReselected(Tab tab, android.app.FragmentTransaction ft) { } } </code></pre> <p>}</p> <p>The first time that I create the fragment, the main activity pass successful the parameters to the Fragment through the overrided <code>getItem(int position)</code>, but if I try to change the data, also if I try to invoke <code>notifyDataSetChanged()</code> on the adapter <code>mMyFragmentAdapter</code>, nothing happens and the fragments in <code>ViewPager</code> continue to use the same data passed in creation.</p> <p><strong>EDIT</strong></p> <p>Following some partial code seen in other question about fragment update I have also tried this</p> <pre><code>public void update() { try{ LineFragment fragment = (LineFragment) getSupportFragmentManager().findFragmentByTag( "android:switcher:"+R.id.view_pager+":0"); if(fragment != null) { if(fragment.getView() != null) { fragment.updateDisplay(); } } } catch(RuntimeException e){ e.printStackTrace(); } } </code></pre> <p>Assuming that 0 is the id of the first Fragment-Tab fragment(I'm not sure about this kind of operation), but <code>fragment.updateDisplay();</code> is not invoked.</p>
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    1. COYou didn't searched to much didn't you? http://stackoverflow.com/questions/7379165/update-data-in-listfragment-as-part-of-viewpager
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      1. POHow to update-refresh Fragment in ViewPager by Main Activity programmatically
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    2. CO@Luksprog mmm It's a bit different from what I have asked for. I need to understand how the Fragment can get the data passed by main, maybe I'm missing something but really I haven't understood how could I do this. If I try to create a custom constructor for my 'LineFragment' I get the error 'This fragment should provide a default constructor (a public constructor with no arguments)'
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      1. USAndreaF
    3. CO@AndreaF check dialog fragment http://developer.android.com/reference/android/app/DialogFragment.html uses a static `static MyDialogFragment newInstance(int num)` to which param is passed and then uses set and get arguments. and you pass the value like `newInstance(value)` if that is what you meany by passing data from main to fragment
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      1. POHow to update-refresh Fragment in ViewPager by Main Activity programmatically
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