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Bouton de retour du tiroir de navigation en fragments

J'ai commencé à créer des applications qui utilisent une activité (tiroir de navigation) et de nombreux fragments. Mais je ne peux pas utiliser le bouton de retour de la barre d'outils pour revenir en arrière à partir des fragments. Le bouton de retour du matériel fonctionne parfaitement. Je sais que je dois remplacer onOptionsItemSelected, attraper Android.R.id.home, vérifiez s'il y a quelque chose dans la pile arrière et sautez-le. Après avoir changé le fragment, le bouton "burger" se transforme en "flèche arrière", mais quand je clique dessus onOptionsItemSelected n'a jamais tiré, ouvre simplement le menu NavigationDrawer.

Voici le code de l'activité:

public class NavDrawerActivity extends AppCompatActivity implements ... {

    NavigationView navigationView;
    BottomNavigationView bottomNavigationView;
    ActionBarDrawerToggle toggle;
    FragmentManager fragmentManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_nav_drawer);

        fragmentManager = getSupportFragmentManager();

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        final DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);

        toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);

        drawer.addDrawerListener(toggle);

        toggle.syncState();

        // Set back button
        fragmentManager.addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() {
            @Override
            public void onBackStackChanged() {
                if (fragmentManager.getBackStackEntryCount() > 0) {
                    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
                } else {
                    getSupportActionBar().setDisplayHomeAsUpEnabled(false);
                    toggle.syncState();
                }
            }
        });

        // Load default fragment
        changeFragment(new HomeFragment(), false);

        navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);

        View headerLayout = navigationView.getHeaderView(0);

        bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottom_navigation);
        bottomNavigationView.setOnNavigationItemSelectedListener(this);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case Android.R.id.home:
                Toast.makeText(this, "Back pressed", Toast.LENGTH_SHORT)
                        .show();
                onBackPressed();
                return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onBackPressed() {
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);

        if (drawer.isDrawerOpen(GravityCompat.START))
            drawer.closeDrawer(GravityCompat.START);

        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        } else if (fragmentManager.getBackStackEntryCount() > 0) {
            fragmentManager.popBackStack();
        } else {
            super.onBackPressed();
        }
    }

    private void changeFragment(Fragment fm, boolean addToBackStack)
    {
        FragmentTransaction ft = fragmentManager.beginTransaction();
        ft.replace(R.id.frame_layout_content, fm);
        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
        if (addToBackStack) ft.addToBackStack(null);
        ft.commit();
    }

}

Et comment je change (remplace) les fragments de HomeFragment:

IndexDetailFragment newFragment = new IndexDetailFragment();
Bundle args = new Bundle();

args.putString(IndexDetailFragment.ARG_INDEX_ID, id);

newFragment.setArguments(args);

FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.setCustomAnimations(R.anim.slide_in_right, R.anim.slide_out_left);
transaction.replace(R.id.frame_layout_content, newFragment);
transaction.addToBackStack(null);

transaction.commit();
androidandroid-fragmentsnavigation-drawer
7
Alex

setNavigationOnClick() sur le toolbar après setSupportActionBar(toolbar):

setSupportActionBar(toolbar);
toolbar.setNavigationOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view) {
                Toast.makeText(getActivity(), "Back clicked!",     
                Toast.LENGTH_SHORT).show();
            }
        });

J'ai fait une petite application pour référence

FirstFragment

 public class FirstFragment extends Fragment {


public FirstFragment() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_first, container, false);
}

}

SecondFragment

public class SecondFragment extends Fragment {


public SecondFragment() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_second, container, false);
}

}

Activité principale

public class MainActivity extends AppCompatActivity {
private Toolbar mToolbar;
private ActionBarDrawerToggle drawerToggle;
private DrawerLayout mDrawerLayout;
private String TAG = "MainActivity";
private FragmentManager mFragmentManager;
private NavigationView mNavigationView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mToolbar = (Toolbar) findViewById(R.id.toolbar);
    if (mToolbar != null) {
        setSupportActionBar(mToolbar);
    }
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer);
    drawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.drawer_open, R.string.drawer_close) {
        @Override
        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
        }

        @Override
        public void onDrawerClosed(View drawerView) {
            super.onDrawerClosed(drawerView);
        }
    };
    mDrawerLayout.addDrawerListener(drawerToggle);
    mNavigationView = findViewById(R.id.navigation);
    mNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem item) {
            switch (item.getItemId()) {
                case R.id.first:
                    changeFragment(new FirstFragment(), true);
                    return true;
                case R.id.second:
                    changeFragment(new SecondFragment(), true);
                    return true;
            }
            return false;
        }
    });
    mFragmentManager = getSupportFragmentManager();
    changeFragment(new FirstFragment(), true);
}

@Override
protected void onPostCreate(@Nullable Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    if (drawerToggle != null) {
        drawerToggle.syncState();
    }
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() == Android.R.id.home) {
        Log.i(TAG, "onOptionsItemSelected: Home Button Clicked");
        if (mDrawerLayout.isDrawerOpen(Gravity.START)) {
            mDrawerLayout.closeDrawer(Gravity.START);
        } else {
            mDrawerLayout.openDrawer(Gravity.START);
        }
    }
    return super.onOptionsItemSelected(item);
}

@Override
public void onBackPressed() {
    if (mDrawerLayout.isDrawerOpen(Gravity.START)) {
        mDrawerLayout.closeDrawer(Gravity.START);
    }
    if (mDrawerLayout.isDrawerOpen(Gravity.START)) {
        mDrawerLayout.closeDrawer(Gravity.START);
    } else if (mFragmentManager.getBackStackEntryCount() > 0) {
        mFragmentManager.popBackStack();
    } else {
        super.onBackPressed();
    }
}

private void changeFragment(Fragment fragment, boolean needToAddBackstack) {
    FragmentTransaction mFragmentTransaction = mFragmentManager.beginTransaction();
    mFragmentTransaction.replace(R.id.FRAME_CONTENT, fragment);
    mFragmentTransaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
    if (needToAddBackstack)
        mFragmentTransaction.addToBackStack(null);
    mFragmentTransaction.commit();
}
}

activity_main

<FrameLayout
    Android:layout_width="match_parent"
    Android:layout_height="match_parent">
            

    <Android.support.v7.widget.Toolbar
        Android:id="@+id/toolbar"
        Android:layout_width="match_parent"
        Android:layout_height="@dimen/abc_action_bar_default_height_material"
        Android:background="@color/colorPrimaryDark"
        />

    <FrameLayout
        Android:id="@+id/FRAME_CONTENT"
        Android:layout_width="match_parent"
        Android:layout_height="match_parent"
        Android:layout_marginTop="@dimen/abc_action_bar_default_height_material" />
</FrameLayout>

<Android.support.design.widget.NavigationView
    Android:id="@+id/navigation"
    Android:layout_width="wrap_content"
    Android:layout_height="match_parent"
    Android:layout_gravity="start"
    Android:layout_marginTop="@dimen/abc_action_bar_default_height_material"
    app:menu="@menu/drawermenu" />
  </Android.support.v4.widget.DrawerLayout>
10
Arvind

J'ai eu le même problème.

J'ai finalement résolu en ajoutant cela dans la méthode onCreate.

getSupportFragmentManager().addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() {
        @Override
        public void onBackStackChanged() {
            if(getSupportFragmentManager().getBackStackEntryCount() == 0){
                drawer.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
                menuToggle.setDrawerIndicatorEnabled(true);
            }else{
                drawer.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
                menuToggle.setDrawerIndicatorEnabled(false);

            }
        }
    });

J'espère que ça aide

2
ezefire

Ajoutez le code ci-dessous dans la méthode onCreate () qui fonctionne pour moi

    getSupportFragmentManager().addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() {
        @Override
        public void onBackStackChanged() {
            if (getSupportFragmentManager().getBackStackEntryCount() > 0) {
                getSupportActionBar().setDisplayHomeAsUpEnabled(true);
                toolbar.setNavigationOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Toast.makeText(MainActivity.this, " Back Pressed ", Toast.LENGTH_SHORT).show();
                    }
                });
            } else {
                getSupportActionBar().setDisplayHomeAsUpEnabled(false);
                drawerToggle = new ActionBarDrawerToggle(MainActivity.this, drawerLayout, toolbar,
                        R.string.app_name, R.string.app_name);
                drawerLayout.addDrawerListener(drawerToggle);
                drawerToggle.syncState();
            }
        }
    });
0
Piyush MandaliYa