android-bottomNavigationView bottom navigation bar

Today we use bottomNavigationView+fragment to implement a common bottom switching layout. The following effects
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1. First, a simple layout, a fragment and a bottomnavigationview

as follows: Insert picture description here

2. A menu menu is needed. Let's implement it. The method is the same as that of the navigation bar menu. You can refer to the previous content (only a new icon is added here)

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The code is as follows:
(Find the picture by yourself)

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/second_bottomnavigation_home"
        android:icon="@drawable/unhome"
        android:title="首页" />
    <item
        android:id="@+id/second_bottomnavigation_news"
        android:icon="@drawable/news"
        android:title="新闻" />
    <item
        android:id="@+id/second_bottomnavigation_photo"
        android:icon="@drawable/photo"
        android:title="图片" />
    <item
        android:id="@+id/second_bottomnavigation_my"
        android:icon="@drawable/my"
        android:title="我的" />
</menu>

The navigation bar comes out Insert picture description here

Third, realize the click to switch fragment. (Fragment will not be described, please refer to the previous article)

The initialization control is extracted as a global variable

private void initUI() {
    
    
//        初始化控件
        second_bottomnavigation = findViewById(R.id.second_bottomnavigation);
    }

Monitor her state through setOnNavigationItemSelectedListener,
and control the switch by getting id through item, the code is as follows.

   private void Listener() {
    
    
//        点击事件
        second_bottomnavigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
    
    
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
    
    
                switch (item.getItemId()){
    
    
                    case R.id.second_bottomnavigation_home:
                        break;
                    case R.id.second_bottomnavigation_news:
                        break;
                    case R.id.second_bottomnavigation_photo:
                        break;
                    case R.id.second_bottomnavigation_my:
                        break;
                }
                return true;
            }
        });
    }

Then add the switching state of the fragment in the click event.
Fool-like reminder: Be sure to return true
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Echoing from the beginning to the end, see the effect-(´∀`;)

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ps: Change the theme color by myself, I went to the top navigation bar.
PS: This article uses the method of quotation... Hey