Em Voltar, pressione e percorra as duas últimas guias que não estão funcionando corretamente no BottomNavigationView?
Ao clicar no botão Voltar, navegue até a guia anterior que foi aberta. Você sairá do aplicativo apenas percorrendo as duas últimas guias que você abriu.
Eu só quero atravessar todas as guias que abri e o aplicativo deve sair
Aqui está o layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:design="http://schemas.android.com/apk/res-auto"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.segunfamisa.sample.bottomnav.MainActivity">
<FrameLayout
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:background="#f1f1f1">
</FrameLayout>
<android.support.design.widget.BottomNavigationView
android:id="@+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="start"
design:menu="@menu/bottom_nav_items" />
</LinearLayout>
Aqui está a atividade:
public class MainActivity extends AppCompatActivity {
private static final String SELECTED_ITEM = "arg_selected_item";
private BottomNavigationView mBottomNav;
private int mSelectedItem;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mBottomNav = (BottomNavigationView) findViewById(R.id.navigation);
mBottomNav.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
selectFragment(item);
return true;
}
});
MenuItem selectedItem;
if (savedInstanceState != null) {
mSelectedItem = savedInstanceState.getInt(SELECTED_ITEM, 0);
selectedItem = mBottomNav.getMenu().findItem(mSelectedItem);
} else
{
selectedItem = mBottomNav.getMenu().getItem(0);
}
selectFragment(selectedItem);
}
@Override
protected void onSaveInstanceState(Bundle outState) {
outState.putInt(SELECTED_ITEM, mSelectedItem);
super.onSaveInstanceState(outState);
}
@Override
public void onBackPressed() {
MenuItem homeItem = mBottomNav.getMenu().getItem(0);
if (mSelectedItem != homeItem.getItemId()) {
selectFragment(homeItem);
// Select home item
mBottomNav.setSelectedItemId(homeItem.getItemId());
} else {
super.onBackPressed();
}
}
private void selectFragment(MenuItem item) {
Fragment frag = null;
item.setCheckable(true);
// init corresponding fragment
switch (item.getItemId()) {
case R.id.menu_home:
TabFragmentOne fragmentone = new TabFragmentOne();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.container, fragmentone);
ft.commit();
break;
case R.id.menu_notifications:
TabFragmentThree fragmentone_Three = new TabFragmentThree();
FragmentTransaction ft_three = getSupportFragmentManager().beginTransaction();
ft_three.replace(R.id.container, fragmentone_Three);
ft_three.commit();
break;
case R.id.menu_search:
TabFragmentTwo tabFragmentTwo = new TabFragmentTwo();
FragmentTransaction ft_two = getSupportFragmentManager().beginTransaction();
ft_two.replace(R.id.container,tabFragmentTwo);
ft_two.commit();
break;
}
// update selected item
mSelectedItem = item.getItemId();
updateToolbarText(item.getTitle());
if (frag != null) {
TabFragmentOne fragmentone = new TabFragmentOne();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.container, fragmentone);
ft.commit();
}
}
private void updateToolbarText(CharSequence text) {
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.setTitle(text);
}
}
Por favor me ajude qualquer um ...