Фрагменты Android не работают на панели навигации

Question

Четыре фрагмента были созданы. Все 4 фрагмента отображаются на панели навигации, однако при нажатии на фрагменты ничего не происходит. После нажатия на кнопку вы перейдете на страницу фрагмента.

Я уже пытался удалить фрагменты и код для панели навигации. Это все еще не решает проблему.

Мой NavigationMenu

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/nav_home"
        android:icon="@drawable/ic_home_black_24dp"
        android:title="@string/nav_home" />
    <item
        android:id="@+id/nav_symptoms"
        android:icon="@drawable/ic_contact_black_24dp"
        android:title="@string/nav_symptoms" />
    <item
        android:id="@+id/nav_treatment"
        android:icon="@drawable/ic_contact_black_24dp"
        android:title="@string/nav_treatment" />
    <item
        android:id="@+id/nav_contact"
        android:icon="@drawable/ic_contact_black_24dp"
        android:title="@string/nav_contact" />
</menu>

Мой Layout

    <android.support.design.widget.BottomNavigationView
                android:id="@+id/main_nav"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentStart="true"
                android:layout_alignParentBottom="true"
                app:menu="@menu/nav_items">

            </android.support.design.widget.BottomNavigationView>

            <FrameLayout
                android:id="@+id/main_frame"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_above="@+id/main_nav"
                android:layout_alignParentStart="true"
                android:layout_alignParentTop="true">

            </FrameLayout>

Мой Activity

public class ProfileActivity extends AppCompatActivity implements View.OnClickListener {

    private FirebaseAuth firebaseAuth;
    private TextView textViewUserEmail;
    private Button buttonLogout;
    private BottomNavigationView mMainNav;
    private FrameLayout mMainFrame;

    private HomeFragment homeFragment;
    private SymptomsFragment symptomsFragment;
    private TreatmentFragment treatmentFragment;
    private Contactragment contactragment;

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

        firebaseAuth = FirebaseAuth.getInstance();

        if(firebaseAuth.getCurrentUser() == null){
            finish();
            startActivity(new Intent(this, LoginActivity.class));


            mMainFrame = (FrameLayout) findViewById(R.id.main_frame);
            mMainNav = (BottomNavigationView) findViewById(R.id.main_nav);

            homeFragment = new HomeFragment();
            symptomsFragment = new SymptomsFragment();
            treatmentFragment = new TreatmentFragment();
            contactragment = new Contactragment();

            setFragment(homeFragment);

            mMainNav.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
                @Override
                public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {

                    switch (menuItem.getItemId()) {

                        case R.id.nav_home :
                            mMainNav.setItemBackgroundResource(R.color.colorPrimary);
                            setFragment(homeFragment);
                            return true;

                        case R.id.nav_symptoms:
                            mMainNav.setItemBackgroundResource(R.color.colorAccent);
                            setFragment(symptomsFragment);
                            return true;

                        case R.id.nav_treatment:
                            mMainNav.setItemBackgroundResource(R.color.colorPrimary);
                            setFragment(treatmentFragment);
                            return true;

                        case R.id.nav_contact:
                            mMainNav.setItemBackgroundResource(R.color.colorAccent);
                            setFragment(contactragment);
                            return true;

                            default:
                                return false;


                    }
                }
            });
        }

        FirebaseUser user = firebaseAuth.getCurrentUser();

        textViewUserEmail = (TextView) findViewById(R.id.textViewUserEmail);

        textViewUserEmail.setText("Welcome"+user.getEmail());

        buttonLogout = (Button) findViewById(R.id.buttonLogout);

        buttonLogout.setOnClickListener(this);

        //listener has been added
    }

    private void setFragment (Fragment fragment) {

        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();

        fragmentTransaction.replace(R.id.main_frame, fragment);

        fragmentTransaction.commit();

    }

    @Override
    public void onClick(View view) {

        if(view == buttonLogout){
            firebaseAuth.signOut();
            finish();
            startActivity(new Intent(this, LoginActivity.class));
        }

    }
}

После перехода домой с этой страницы вы перейдете к фрагменту дома.

Answer 1

Я думаю, вы могли бы искать это.Вот быстрый фрагмент, чтобы начать. activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools">


        <FrameLayout
            android:id="@+id/viewlayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>

        <android.support.design.widget.BottomNavigationView
            android:id="@+id/bottom_navigation"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:itemBackground="@color/colorAccent"
            android:layout_gravity="bottom"
            tools:elevation="2dp"
            app:itemTextColor="#fff"
            android:layout_alignParentBottom="true"
            app:menu="@menu/bottom_menu" />
</RelativeLayout>

Создать файл ресурсов меню внутри res / menu / bottom_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/action_home"
        android:enabled="true"
        android:icon="@drawable/ic_home_black_24dp"
        android:title="@string/home"
        app:showAsAction="ifRoom" />
    <item
        android:id="@+id/action_msg"
        android:enabled="true"
        android:icon="@drawable/ic_message_black_24dp"
        android:title="@string/msg"
        app:showAsAction="ifRoom" />
    <item
        android:id="@+id/action_video"
        android:enabled="true"
        android:icon="@drawable/ic_ondemand_video_black_24dp"
        android:title="@string/video"
        app:showAsAction="ifRoom" />
    <item
        android:id="@+id/action_info"
        android:enabled="true"
        android:icon="@drawable/ic_notifications_black_24dp"
        android:title="@string/info"
        app:showAsAction="ifRoom" />
</menu>

СоздатьФрагменты для каждого из представлений:

Создание четырех фрагментов с именем Home, Message, Video и Notification.

Реализация OnItemSelectedListener представления BottomNavigation: MainActivity.java:

package net.technxt;

import android.support.annotation.NonNull;
import android.support.design.bottomnavigation.LabelVisibilityMode;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MenuItem;
import android.widget.FrameLayout;



public class MainActivity extends AppCompatActivity {

    BottomNavigationView bottomNavigationView;
    FrameLayout viewlayout;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        viewlayout = (FrameLayout)findViewById(R.id.viewlayout);
        bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottom_navigation);

        final FragmentManager fragmentManager = getSupportFragmentManager();

        // Declare fragments here
        final Home home = new Home();
        final Message msg = new Message();
        final Video video = new Video();
        final Notification noti = new Notification();



        bottomNavigationView.setOnNavigationItemSelectedListener(
                new BottomNavigationView.OnNavigationItemSelectedListener() {
                    @Override
                    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                        Fragment fragment;
                        switch (item.getItemId()) {
                            case R.id.action_home:
                                fragment = home;
                                setTitle(item.getTitle());
                                break;
                            case R.id.action_msg:
                                fragment = msg;
                                setTitle(item.getTitle());
                                break;
                            case R.id.action_video:
                                fragment = video;
                                setTitle(item.getTitle());
                                break;
                            case R.id.action_info:
                            default:
                                fragment = noti;
                                setTitle(item.getTitle());
                                break;

                        }
                        fragmentManager.beginTransaction().replace(R.id.viewlayout, fragment).commit();
                        return true;
                    }
                });




        // Set default selection
        bottomNavigationView.setLabelVisibilityMode(LabelVisibilityMode.LABEL_VISIBILITY_LABELED);
        bottomNavigationView.setSelectedItemId(R.id.action_home);


    }
}

Как создать нижнюю панель навигации для Android?