If the fragment is already added... how to reload it again

Question

What i am doing::

• I am launching a fragment onClick of an Item from actionbar

What is happening::

• I am able to launch the fragment for the first time.

• Now when i click the actionbar menu item for the second time. I am getting the error as shown in log

• What should happen is i should just reload the fragment if its already in container

• If the fragment is already added how to reload it

MainActivity.java

public class MainActivity extends SherlockFragmentActivity implements OnItemClickListener{

    private DrawerLayout drawlayout=null;
    private ListView listview=null;
    private ActionBarDrawerToggle actbardrawertoggle=null;

    FragmentTransaction ft1 ;
    FragSearch fragSearch=new FragSearch();
    mFragSortingHome fragment1=new mFragSortingHome();

    private String[] myfriendname=null;
    private int[] photo=null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.drawer_activity_main);
        //Code moved to a seperate function from onCreate with a call in it for clarity
        drawerConfig(savedInstanceState);

    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        actbardrawertoggle.syncState();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        actbardrawertoggle.onConfigurationChanged(newConfig);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        if(item.getItemId()==android.R.id.home)
        {
            if(drawlayout.isDrawerOpen(listview))
            {
                drawlayout.closeDrawer(listview);
            }
            else {
                drawlayout.openDrawer(listview);
            }
        }else if(item.getItemId()==R.id.searchID){
            //SEARCH Button Handling
            ft1=getSupportFragmentManager().beginTransaction();
            ft1.hide(fragment1);
            ft1.add(R.id.content_frame, fragSearch);
            ft1.addToBackStack(null);
            ft1.commit();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }    



        @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater menuInflater = getSupportMenuInflater();
        menuInflater.inflate(R.menu.actionbar_sort_menu, menu);

        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
        selectItem(position);

    }

    private void drawerConfig(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        myfriendname = new String[] { "Home", "Login","List", "Photo", "Filter" };
        photo = new int[] { R.drawable.ic_action_map, R.drawable.ic_action_accounts, R.drawable.ic_action_view_as_list, R.drawable.ic_action_photo, R.drawable.ic_action_photo};

        drawlayout = (DrawerLayout)findViewById(R.id.drawer_layout);
        listview = (ListView) findViewById(R.id.listview_drawer);

        getSupportActionBar().setHomeButtonEnabled(true);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setDisplayShowHomeEnabled(true);
        getSupportActionBar().setDisplayShowTitleEnabled(true);

        drawlayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
        drawlayout.setBackgroundColor(Color.WHITE);

        DrawerMenuListAdapter menuadapter=new DrawerMenuListAdapter(getApplicationContext(), myfriendname, photo); 
        listview.setAdapter(menuadapter);

        actbardrawertoggle= new ActionBarDrawerToggle(this, drawlayout, R.drawable.ic_drawer, R.string.drawer_open, R.string.drawer_close)
        {
            public void onDrawerClosed(View view) {
                super.onDrawerClosed(view);
            }

            public void onDrawerOpened(View drawerView) {
                super.onDrawerOpened(drawerView);

            }

        };
        drawlayout.setDrawerListener(actbardrawertoggle);

        listview.setOnItemClickListener(this);

        if (savedInstanceState == null) {
            selectItem(0);
        }
    }

    private void selectItem(int position) {

        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();

        // Locate Position
        switch (position) {
        case 0:
            mFragSortingHome fragment1=new mFragSortingHome();
            ft.replace(R.id.content_frame, fragment1);/*
            Bundle b = new Bundle();
            b.putString("name",myfriendname[position]);
            b.putInt("photo",photo[position]);
            fragment1.setArguments(b);*/
            break;
        case 1:
            FilterBuffetFragment fragment2=new FilterBuffetFragment();
            ft.replace(R.id.content_frame, fragment2);/*
            Bundle b1 = new Bundle();
            b1.putString("name",myfriendname[position]);
            b1.putInt("photo",photo[position]);
            fragment2.setArguments(b1);*/
            break;
        case 2:
            mFragment3 fragment3=new mFragment3();
            ft.replace(R.id.content_frame, fragment3);/*
            Bundle b2 = new Bundle();
            b2.putString("name",myfriendname[position]);
            b2.putInt("photo",photo[position]);
            fragment3.setArguments(b2);*/
            break;
        case 3:
            mFragment4 fragment4=new mFragment4();
            ft.replace(R.id.content_frame, fragment4);/*
            Bundle b3 = new Bundle();
            b3.putString("name",myfriendname[position]);
            b3.putInt("photo",photo[position]);
            fragment4.setArguments(b3);*/
            break;
        case 4:
            FilterBuffetFragment fragment5=new FilterBuffetFragment();
            ft.replace(R.id.content_frame, fragment5);
            ft.addToBackStack(null);/*
            Bundle b4 = new Bundle();
            b4.putString("name",myfriendname[position]);
            b4.putInt("photo",photo[position]);
            fragment5.setArguments(b4);*/
            break;

        }
        ft.commit();
        listview.setItemChecked(position, true);
        /*setTitle(myfriendname[position]);*/
        drawlayout.closeDrawer(listview);
    }

}

code where i am loading the fragment oncick of action bar item is

}else if(item.getItemId()==R.id.searchID){
            //SEARCH Button Handling
            ft1=getSupportFragmentManager().beginTransaction();
            ft1.hide(fragment1);
            ft1.add(R.id.content_frame, fragSearch);
            ft1.addToBackStack(null);
            ft1.commit();
            return true;

Log::

05-04 00:42:01.896: E/AndroidRuntime(2253): FATAL EXCEPTION: main
05-04 00:42:01.896: E/AndroidRuntime(2253): java.lang.IllegalStateException: Fragment already added: FragSearch{415a4748 #1 id=0x7f04003e}
05-04 00:42:01.896: E/AndroidRuntime(2253):     at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1159)
05-04 00:42:01.896: E/AndroidRuntime(2253):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:616)
05-04 00:42:01.896: E/AndroidRuntime(2253):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
05-04 00:42:01.896: E/AndroidRuntime(2253):     at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:429)
05-04 00:42:01.896: E/AndroidRuntime(2253):     at android.os.Handler.handleCallback(Handler.java:605)
05-04 00:42:01.896: E/AndroidRuntime(2253):     at android.os.Handler.dispatchMessage(Handler.java:92)
05-04 00:42:01.896: E/AndroidRuntime(2253):     at android.os.Looper.loop(Looper.java:137)
05-04 00:42:01.896: E/AndroidRuntime(2253):     at android.app.ActivityThread.main(ActivityThread.java:4340)
05-04 00:42:01.896: E/AndroidRuntime(2253):     at java.lang.reflect.Method.invokeNative(Native Method)
05-04 00:42:01.896: E/AndroidRuntime(2253):     at java.lang.reflect.Method.invoke(Method.java:511)
05-04 00:42:01.896: E/AndroidRuntime(2253):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-04 00:42:01.896: E/AndroidRuntime(2253):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
05-04 00:42:01.896: E/AndroidRuntime(2253):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

Use FragmentManager.findFragmentById or FragmentManager.findFragmentByTag to find the fragment you already added. If those methods return null, then the fragment has not yet been added, and you can proceed like you are doing right now. When those methods find the fragment, you have a reference that can be used: design your fragment class to feature a reload method or similar, that you may call in this case.