如何实现Android的BottomAppBar?

Android BottomAppBar

这是我最近的一次:

这是我当前的实现-

片段\u bottomsheet.xml:

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


    <com.google.android.material.navigation.NavigationView
        android:id="@+id/navigation_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:menu="@menu/activity_main_drawer">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text=""/>
    </com.google.android.material.navigation.NavigationView>

</androidx.constraintlayout.widget.ConstraintLayout>

BottomNavigationDrawerFragment.java:

package com.jggdevelopment.wannacook.dialog_fragments;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.google.android.material.bottomsheet.BottomSheetDialogFragment;
import com.jggdevelopment.wannacook.R;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

public class BottomNavigationDrawerFragment extends BottomSheetDialogFragment {

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_bottomsheet, container, false);
    }
}

package com.jggdevelopment.wannacook;

import android.content.Intent;
import androidx.fragment.app.FragmentManager;
import android.os.Bundle;

import com.google.android.material.bottomappbar.BottomAppBar;
import com.google.android.material.navigation.NavigationView;
import androidx.appcompat.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.WindowManager;

import com.google.android.material.floatingactionbutton.FloatingActionButton;

import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.jggdevelopment.wannacook.dialog_fragments.AddShoppingListItemDialog;
import com.jggdevelopment.wannacook.dialog_fragments.BottomNavigationDrawerFragment;
import com.jggdevelopment.wannacook.fragments.FridgeFragment;
import com.jggdevelopment.wannacook.fragments.ShoppingListFragment;
import com.jggdevelopment.wannacook.fragments.PantryFragment;
import com.jggdevelopment.wannacook.R;

/**
 * Main activity for the application, handles general housekeeping and side navigation
 */
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {

    private BottomAppBar bottomAppBar;
    private FloatingActionButton mFab;
    private FirebaseDatabase database = FirebaseDatabase.getInstance();
    private DatabaseReference db = database.getReference();

    private static final int RC_SIGN_IN = 123;

    /**
     * instantiates fields and sets the main screen to be the ShoppingListFragment
     * @param savedInstanceState
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);
        setSupportActionBar(bottomAppBar);

        mFab = findViewById(R.id.fab);
        bottomAppBar = findViewById(R.id.bottom_app_bar);
        ShoppingListFragment shoppingListFragment = new ShoppingListFragment();

        getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
        getSupportFragmentManager().beginTransaction()
                .add(R.id.relative_layout_for_fragment, shoppingListFragment).commit();

        mFab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                FragmentManager fm = getSupportFragmentManager();
                AddShoppingListItemDialog addItemDialogFragment = AddShoppingListItemDialog.newInstance("Title");
                addItemDialogFragment.show(fm, "new_shopping_list_item_dialog");
            }
        });

        bottomAppBar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                BottomNavigationDrawerFragment bndf = new BottomNavigationDrawerFragment();
                bndf.show(getSupportFragmentManager(), bndf.getTag());
            }
        });
    }

    /**
     * handles functionality for the three dots option menu in the toolbar
     * @param menu menu to create
     * @return true
     */
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main_drawer, menu);
        return true;
    }

    /**
     * handles what should happen when one of the options in the toolbar menu is selected
     * @param item
     * @return
     */
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.

        if (item.getItemId() == R.id.action_sign_out) {
            FirebaseAuth.getInstance().signOut();
            Intent intent = new Intent(this, SignInActivity.class);
            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(intent);
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    /**
     * handles what should happen when one of the options in the navigation menu is selected
     * @param item
     * @return
     */
    @Override
    public boolean onNavigationItemSelected(MenuItem item) {
        // Handle navigation view item clicks here.
        int id = item.getItemId();

        // home button
        if (id == R.id.nav_shopping_list) {
            ShoppingListFragment shoppingListFragment = new ShoppingListFragment();
            FragmentManager manager = getSupportFragmentManager();
            manager.beginTransaction().replace(
                    R.id.relative_layout_for_fragment,
                    shoppingListFragment,
                    shoppingListFragment.getTag()
            ).commit();
        }

        // fridge button
        else if (id == R.id.nav_fridge) {
            FridgeFragment fridgeFragment = new FridgeFragment();
            FragmentManager manager = getSupportFragmentManager();
            manager.beginTransaction().replace(
                    R.id.relative_layout_for_fragment,
                    fridgeFragment,
                    fridgeFragment.getTag()
            ).commit();
        }

        // pantry button
        else if (id == R.id.nav_pantry) {
            PantryFragment pantryFragment = new PantryFragment();
            FragmentManager manager = getSupportFragmentManager();
            manager.beginTransaction().replace(
                    R.id.relative_layout_for_fragment,
                    pantryFragment,
                    pantryFragment.getTag()
            ).commit();
        }

        // share button
        else if (id == R.id.nav_share) {
            // TODO: allow user to share app link with other people
        }

        // contact developer button
        else if (id == R.id.nav_contact) {
            // TODO: send intent to email application to email developer
        }

        return true;
    }


}