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PORemove all fragments from ViewPager populated by FragmentStatePagerAdapter
 

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  1. PORemove all fragments from ViewPager populated by FragmentStatePagerAdapter
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    <p>I have a ViewPager that I am populating with fragments(representing objects from arrayListOfObjects) using FragmentStatePagerAdapter. All works well:</p> <pre><code> mMyFragmentPagerAdapter = new fragmentAdapter(getSupportFragmentManager(),orientation ,rePopulatedfireInfoList); mPager = (ViewPager)findViewById(R.id.fireInfoFragment_container); initButton(); setTab(); mPager.setAdapter(mMyFragmentPagerAdapter); </code></pre> <p>The fragment adapter extends FragmentStatePagerAdapter.</p> <p>From the primary activity I launch a dialog themed activity; where the user may add a new favourite location creating a new object which alters the arraylist of objects passed by the primary activity. This is the code for starting dialog activity; all works fine:</p> <pre><code> Intent locationIntent = new Intent(afisController.this, locationActivity.class); locationIntent.putExtra("firesList", new fireInfoListWrapper(arrayListOfObjects)); startActivityForResult(locationIntent,1); </code></pre> <p>The floating activity adds objects into arrayListOfObjects.</p> <p>On the primary activity's onActivityResult I compare the arraListOfObjects I'm receiving with the one I sent; if different I want to completely remove the contents of the viewPager and recreate it with the new arrayListOfObjects. This is the onActivityResults:</p> <pre><code> protected void onActivityResult(int requestCode, int resultCode, Intent data) { Toast.makeText(this, "Activity Results fired..." , 1500 ).show(); if ((resultCode == 0) &amp;&amp; (data != null)) { Log.i("onActvityResult", "Inside resultCode check"); Bundle b = data.getExtras(); if(b != null){ Log.i("onActvityResult", "not null"); returnedFireInfoList = (ArrayList&lt;fireInfo&gt;) data.getSerializableExtra("firesListResult"); Log.i("onActvityResult", "results Size: "+returnedFireInfoList.size()); if(returnedFireInfoList.size()&gt;0){ Log.i("onActvityResult", "locationName: "+returnedFireInfoList.get(0).getLocationName()); //compare returnedFireInfoList and rePopulatedfireInfoList, if different; //add difference to rePopulatedfireInfoList and write back to file. updateFireInfos(returnedFireInfoList, rePopulatedfireInfoList); if(returnedFireInfoList.size()!=rePopulatedfireInfoList.size()){ mMyFragmentPagerAdapter1 = new fragmentAdapter(getSupportFragmentManager(),orientation ,returnedFireInfoList); mPager = (ViewPager)findViewById(R.id.fireInfoFragment_container); Log.i("updateFireInfos", "fragmentsCount is"+mPager.getCurrentItem()); fireInfoFragment fragment = (fireInfoFragment) getSupportFragmentManager().findFragmentById(R.id.fireInfoFragment_container); //This is where the problem is, I don't want to remember what was already on the viewPager //called mPager before. // mPager.removeAllViews(); //mPager.setAdapter(null); mMyFragmentPagerAdapter1.notifyDataSetChanged(); mPager.setAdapter(mMyFragmentPagerAdapter1); mMyFragmentPagerAdapter1.notifyDataSetChanged(); } } } </code></pre> <p>This is the fragmentStateAdapter code:</p> <pre><code>public class fragmentAdapter extends FragmentStatePagerAdapter { private FragmentManager fragmentManager; private FragmentTransaction mCurTransaction = null; private ArrayList&lt;Fragment.SavedState&gt; mSavedState = new ArrayList&lt;Fragment.SavedState&gt;(); private ArrayList&lt;Fragment&gt; mFragments = new ArrayList&lt;Fragment&gt;(); private Fragment mCurrentPrimaryItem = null; public void restoreState(Parcelable state, ClassLoader loader) { //Need to only delete info from marked fragments (theoned that are stored on orientationchange //Currently redoing the entire call; resulting in delay due to server call //if(isLastOrientationPortrait != isPortrait){ if(state != null){ Bundle bundle1 = (Bundle) state; bundle1.setClassLoader(loader); Iterable&lt;String&gt; keys = bundle1.keySet(); Log.i("restoreState", "containsKey FragmentStatePagerAdapter: "+keys); //android.support.v4.app.FragmentManager fragmentManager= fragmentAdapter.this.fragmentManager; android.support.v4.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); //if (fragmentTransaction == null) { // Log.i("restoreState", "fragmentTransactionTest"); fragmentTransaction = fragmentManager.beginTransaction(); // } for (String key : keys) { if (key.startsWith("f")) { Fragment f = fragmentManager.getFragment(bundle1, key); fragmentTransaction.remove(f); fragmentTransaction.commit(); } } } //} } @Override public int getItemPosition(Object object) { // TODO Auto-generated method stub //return super.getItemPosition(object); return fragmentAdapter.POSITION_NONE; } public fragmentAdapter(android.support.v4.app.FragmentManager fragmentManager,String orientation, ArrayList&lt;fireInfo&gt; fireInfoList) { super(fragmentManager); this.orientation = orientation; this.fireInfoList = fireInfoList; this.numItems = fireInfoList.size(); this.fragmentManager=fragmentManager; } ArrayList&lt;fireInfo&gt; fireInfoList; String orientation; int numItems; @Override public int getCount() { Log.i("numItems", "is: "+fireInfoList.size()); return numItems; } @Override public Fragment getItem(int arg0) { Log.i("fragmentAdapterIndex", "is: "+arg0); return fireInfoFragment.newInstance(orientation, fireInfoList.get(arg0)); } </code></pre> <p>}</p> <p><strong>Problem:</strong> But the new ArrayListOfObjects is added alongside the old one before I fired the startActivityFor results.</p> <p>How do I force the viewPager to forget it old content? basically reset the viewPager adapter with this newArrayListofObjects using my fragmentStateAdapter?</p>
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