Hi
I have created an Activity from the template of a Blank Activity (
http://developer.android.com/tools/projects/templates.html#blank-activity)
with *Navigation Type: Tabs* or *Tabs + Swipe*
My code is below. I cannot find a way to remove a fragment. I can delete a
tab from the pager at the Top but the fragment below is not removed. Please
can you tell me what I am doing wrong? Any help would be appreciated.
Thanks in advance.
import android.content.Context;
import android.content.Intent;
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.ViewPager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
public class MainActivity extends FragmentActivity {
private static final String TAG = "Tag";
SectionsPagerAdapter mSectionsPagerAdapter;
Context context;
ArrayList<String> titles;
ArrayList<Fragment> frags;
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
context = getApplicationContext();
//========================
titles = new ArrayList<String>();
frags = new ArrayList<Fragment>();
titles.add("One");
titles.add("Two");
titles.add("Three");
titles.add("Four");
createFrags();
//=========================
setContentView(R.layout.activity_main);
// Create the adapter that will return a fragment for each of the
three
// primary sections of the app.
mSectionsPagerAdapter = new
SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
public void createFrags()
{
for (int i = 0; i < titles.size(); i++)
{
Fragment fragment = genFrag(i+"");
frags.add(fragment);
}
}
public Fragment genFrag(String i)
{
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putString(DummySectionFragment.ARG_SECTION_NUMBER, i);
fragment.setArguments(args);
return fragment;
}
@Override
public void onDestroy()
{
super.onDestroy();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is
present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
Log.d(TAG,"onOptionsItemSelected");
// Handle item selection
switch (item.getItemId()) {
case R.id.action_settings:
Log.d(TAG,"Settings menu item pressed");
Toast.makeText(this,"Settings",Toast.LENGTH_LONG);
Intent i = new Intent(getApplicationContext(),
SettingsActivity.class);
startActivity(i);
return true;
case R.id.action_sendmsg:
Log.d(TAG,"Send Message Option Pressed");
// Start the service, keeping the device awake while it is
launching.
Intent intent = new Intent(this,
SendMsgIntentService.class);
startService(intent);
Log.d(TAG,"Service Should be started?");
return true;
case R.id.action_add:
Log.d(TAG,"Add menu item pressed");
addTab("New");
return true;
case R.id.action_delete:
Log.d(TAG,"delete menu item pressed");
int a = mViewPager.getCurrentItem();
removeTab(a);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public void addTab(String name)
{
Log.i(TAG,"Add Tab");
titles.add("New");
Fragment f = genFrag(name);
frags.add(f);
mSectionsPagerAdapter.notifyDataSetChanged();
/*
int position = mSectionsPagerAdapter.getCount()+1;
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position);
fragment.setArguments(args);
mSectionsPagerAdapter.instantiateItem(mViewPager, position);
mSectionsPagerAdapter.notifyAll();
*/
}
public void removeTab(int position)
{
Log.i(TAG,"Remove Tab");
if(titles.size()==1)
{
Toast.makeText(context, "You need to have at least one
page.",Toast.LENGTH_LONG).show();
}else{
titles.remove(position);
frags.remove(position);
mSectionsPagerAdapter.notifyDataSetChanged();
}
/*
mSectionsPagerAdapter.destroyItem(mViewPager, position,
mSectionsPagerAdapter.getItem(position));
mSectionsPagerAdapter.notifyDataSetChanged();
*/
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding
to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given
page.
// Return a DummySectionFragment (defined as a static inner
class
// below) with the page number as its lone argument.
return frags.get(position);
}
@Override
public int getCount() {
// Show 3 total pages.
return frags.size();
}
@Override
public CharSequence getPageTitle(int position) {
return titles.get(position);
}
}
/**
* A dummy fragment representing a section of the app, but that simply
* displays dummy text.
*/
public static class DummySectionFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
public static final String ARG_SECTION_NUMBER = "section_number";
public DummySectionFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup
container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main_dummy,
container, false);
TextView dummyTextView = (TextView)
rootView.findViewById(R.id.section_label);
dummyTextView.setText(getArguments().getString(ARG_SECTION_NUMBER));
return rootView;
}
}
}
>
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