One Fragment’s onCreateContextMenu method calls another Fragment’s onContextItemSelected method

Question

I have a Fragmentactivity that calls its Fragments in the shape of tabs (Viewpager).

In two of these fragments the methods were implemented onCreateContextMenu and onContextItemSelected.

In this case, it turns out that when I call the context menu from the list of a fragment and select an item, the method onContextItemSelected called comes from the other fragment. Therefore, any object within that method is null and generates the Exception.

Fragment 1 - Purchase

@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
    super.onCreateContextMenu(menu, v, menuInfo);
    menu.add(0, 0, 0, "Informações adicionais");
    menu.add(0, 1, 1, "Itens da Compra");
    menu.add(0, 2, 2, "Formas de Pagamento");
}

@Override
public boolean onContextItemSelected(MenuItem item) {
    AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
    dialog = new Dialog(getActivity());
    switch (item.getItemId()) {
        case 0:
            dialog.setContentView(R.layout.item_for_listview_consulta_compras);
            dialog.setTitle("Informações Adicionais");
            exibeCompra(arrayCompra.getItem(info.position));
            break;
        case 1:
            dialog.setContentView(R.layout.simple_listview);
            dialog.setTitle("Itens da Compra");
            exibeListaItens(arrayCompra.getItem(info.position));
            break;
        case 2:
            dialog.setContentView(R.layout.recebimento_forma_pagamento_layout);
            dialog.setTitle("Formas de Pagamento");
            exibeFormaPagamento(arrayCompra.getItem(info.position));
            break;
        default:
            return false;
    }
    return true;
}

Fragment 2 - Sale

@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
    super.onCreateContextMenu(menu, v, menuInfo);
    menu.add(0, 0, 0, "Informações adicionais");
    menu.add(0, 1, 1, "Itens da Venda");
    menu.add(0, 2, 2, "Formas de Pagamento");
}

@Override
public boolean onContextItemSelected(MenuItem item) {
    AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
    dialog = new Dialog(getActivity());
    switch (item.getItemId()) {
        case 0:
            dialog.setContentView(R.layout.item_for_consulta_venda);
            dialog.setTitle("Informações Adicionais");
            exibeVenda(arrayInfoVendas.getItem(info.position));
            break;
        case 1:
            dialog.setContentView(R.layout.simple_listview);
            dialog.setTitle("Itens da Venda");
            exibeListaItens(arrayInfoVendas.getItem(info.position));
            break;
        case 2:
            dialog.setContentView(R.layout.recebimento_forma_pagamento_layout);
            dialog.setTitle("Formas de Pagamento");
            exibeFormaPagamento(arrayInfoVendas.getItem(info.position));
            break;
        default:
            return false;
    }
    return true;
}

Fragmentactivity

public class ConsultaTab extends FragmentActivity implements ActionBar.TabListener {

private ViewPager viewPager;
private TabPagerAdapter myAdapter;
private ActionBar actionBar;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Bundle extras = getIntent().getExtras();

    Funcoes.setMenuOpcoesSempreOn(getApplicationContext());
    setContentView(R.layout.act_consulta_cliente_tab);
    setTitle(R.string.title_activity_consulta);

    myAdapter = new TabPagerAdapter(getSupportFragmentManager());
    actionBar = getActionBar();
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    viewPager = (ViewPager) findViewById(R.id.pager);
    viewPager.setAdapter(myAdapter);

    viewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {

        @Override
        public void onPageSelected(int position) {
            actionBar = getActionBar();
            actionBar.setSelectedNavigationItem(position);
        }

    });

    if (extras != null)
        codPessoa = extras.getLong("codPessoaErp");

    for (int i = 0; i < myAdapter.getCount(); i++) {
        actionBar.addTab(actionBar.newTab().setText(myAdapter.getPageTitle(i)).setTabListener(this));
    }

}

@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
    viewPager.setCurrentItem(tab.getPosition());
}

@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}

@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}

When I call the fragment context menu Buying and select an item, for example "Additional Information", the method onContextItemSelected executed is from the fragment Sale. Only this only happens when I do it first by the Vendae fragment right after I call the Purchase fragment. The error that occurs in this scenario is a Nullpointerexception

Answer 1

There are two ways to deal with this situation:

1 - Assign a groupid different for each item group of each menu.

Fragment Compra:

menu.add(1, 0, 0, "Informações adicionais");
menu.add(1, 1, 1, "Itens da Compra");
menu.add(1, 2, 2, "Formas de Pagamento");

Fragment Venda:

menu.add(2, 0, 0, "Informações adicionais");
menu.add(2, 1, 1, "Itens da Compra");
menu.add(2, 2, 2, "Formas de Pagamento");

In the method onContextItemSelected() test whether the past item belongs to the group you want to treat

@Override
public boolean onContextItemSelected(MenuItem item) {
    if (item.getGroupId() == 1) {
        switch(item.getItemId()) {

            case ....
            case ....
            default:
                return false;
         }
         return true;        
     }
     return false;
}

2 - In the method onContextItemSelected test whether the method getUserVisibleHint() retouching true

@Override
public boolean onContextItemSelected(MenuItem item) {
    if (getUserVisibleHint()) {
        switch(item.getItemId()) {

            case ....
            case ....
            default:
                return false;
         }
         return true;        
     }
     return false;
}

_{Adapted from this question soen.}