Android Material Design之BottomNavigationView(十一)

1. 效果图
   
2. 资源引入

implementation 'com.google.android.material:material:1.4.0'
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3. 属性

4. 源代码
   activity_bottom_app_bar.xml

<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottomNavMenu"
        android:layout_width="match_parent"
        android:layout_height="56dp"
        android:layout_gravity="bottom"
        app:itemIconSize="25dp"
        app:itemIconTint="@color/icon_color"
        app:itemTextColor="@color/text_color"
        app:labelVisibilityMode="labeled"
        app:menu="@menu/bottom_menu" />
androidx.coordinatorlayout.widget.CoordinatorLayout>
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icon_color.xml

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="@color/design_default_color_primary_variant" android:state_checked="true" />
    <item android:color="@color/black" />
selector>
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text_color.xml

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="@color/design_default_color_primary_variant" android:state_checked="true" />
    <item android:color="@color/black" />
selector>

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bottom_menu.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/item1"
        android:icon="@drawable/ic_baseline_message_24"
        android:title="AAA">item>

    <item
        android:id="@+id/item2"
        android:icon="@drawable/ic_baseline_mic_24"
        android:title="BBB">item>

    <item
        android:id="@+id/item3"
        android:icon="@drawable/ic_baseline_videocam_24"
        android:title="CCC">item>

    <item
        android:id="@+id/item4"
        android:icon="@drawable/ic_baseline_person_outline_24"
        android:title="DDD">item>
menu>
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BottomAppBar.java

package com.yyf.demo;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.ContextCompat;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.google.android.material.button.MaterialButtonToggleGroup;
import com.google.android.material.navigation.NavigationBarView;
import com.yyf.demo.databinding.ActivityBottomAppBarBinding;

import java.util.ArrayList;
import java.util.List;

public class BottomAppBar extends AppCompatActivity {
    private ActivityBottomAppBarBinding binding;
    private static final String TAG = "BottomAppBar";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = ActivityBottomAppBarBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

		//监听每个菜单响应事件
        binding.bottomNavMenu.setOnItemSelectedListener(new NavigationBarView.OnItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                Log.d(TAG, "onNavigationItemSelected: " + item.getTitle());
                return true;
            }
        });
    }
}
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5. 注意事项
   底部菜单不可大于5 否则会报如下错误:

Caused by: java.lang.IllegalArgumentException: Maximum number of items supported by BottomNavigationView is 5. Limit can be checked with BottomNavigationView#getMaxItemCount()

有没有办法修改大于5得item,点进源码查看MAX_ITEM_COUNT是final类型得,也就意味着无法修改

public class BottomNavigationView extends NavigationBarView {
static final int MAX_ITEM_COUNT = 5;

public BottomNavigationView(@NonNull Context context) {
this(context, null);
}

public BottomNavigationView(@NonNull Context context, @Nullable AttributeSet attrs) {
this(context, attrs, R.attr.bottomNavigationStyle);
}
public BottomNavigationView(
@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, R.style.Widget_Design_BottomNavigationView);
}
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