Android App 側邊欄菜單的簡單實現

Layout

註意事項

想要實現側邊欄，需要配合使用DrawerLayout。因為會用到嵌套佈局，所以根佈局不能是 ConstraintLayout，最好使用 LinearLayout 佈局。

DrawerLayout 佈局下再嵌套兩個佈局，一個放置內容如 LinearLayout，一個放置側劃菜單，這裡使用 NavigationView

為了出現側邊欄點擊圖標和菜單圖標，需要自定義一個 ToolBar，放置在內容 Layout 里

重點

側劃菜單 NavigationView 一定要設置 android:layout_gravity="start"

實例

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ebook.EbookActivity">

    <androidx.drawerlayout.widget.DrawerLayout
        android:id="@+id/drawer_ebook"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <androidx.appcompat.widget.Toolbar
                android:id="@+id/main_menu_ebook"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />
            <TextView
                android:id="@+id/bookContent"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />
        </LinearLayout>

        <com.google.android.material.navigation.NavigationView
            android:id="@+id/navigation_ebook"
            android:layout_width="230dp"
            android:layout_height="match_parent"
            android:layout_gravity="start"
            app:headerLayout="@layout/navigation_ebook_header"
            app:menu="@menu/menu_drawer_ebook"/>
    </androidx.drawerlayout.widget.DrawerLayout>
</LinearLayout>

Activity

綁定側劃監聽事件

private lateinit var mBinding: ActivityEbookBinding
private lateinit var mDrawerToggle: ActionBarDrawerToggle

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    mBinding = ActivityEbookBinding.inflate(layoutInflater)
    setContentView(mBinding.root)
    setSupportActionBar(mBinding.mainMenuEbook)
    initialData()
}

private fun initialData(){
    //初使化側邊欄監聽事件
    mDrawerToggle = ActionBarDrawerToggle(this, mBinding.drawerEbook, mBinding.mainMenuEbook, R.string.openDrawerContentDesc, R.string.closeDrawerContentDesc)
    mDrawerToggle.syncState()
    //綁定側邊欄監聽事件
    mBinding.drawerEbook.addDrawerListener(mDrawerToggle)

    //側邊欄菜單圖標顏色恢復正常，而非預設的灰色
    mBinding.navigationEbook.itemIconTintList = null
    //綁定側邊欄菜單點擊事件
    mBinding.navigationEbook.setNavigationItemSelectedListener { item: MenuItem ->
        when(item.itemId){
            R.id.menu_drawer_ebook_setting -> showSnackBar(mBinding.navigationEbook,"menu_drawer_setting")
            R.id.menu_drawer_ebook_close -> finish()
        }
        true
    }
}