Android快速开发模板-首页-侧拉栏

# 侧拉栏

侧拉栏结构比较简单，直接上效果图和代码。

## 侧拉栏
### 效果

![drawer-main.png](https://p6-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/fb9893c656ac45bdb7f5ec11d1d53852~tplv-k3u1fbpfcp-jj-mark:0:0:0:0:q75.image#?w=480&h=800&s=10540&e=png&b=ffffff)


![drawer-open.png](https://p6-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/4ef91f00c3204076860afe22d813efae~tplv-k3u1fbpfcp-jj-mark:0:0:0:0:q75.image#?w=480&h=800&s=8274&e=png&b=ffffff)

### 代码实现
#### Activity代码
```Kotlin
override fun initListener() {
    initDrawerLayoutListener()
}

override fun onBackPressed() {
    if (mBinding.mainDrawer.isOpen) {
        // 先关闭侧拉栏
        mBinding.mainDrawer.closeDrawer(GravityCompat.START)
        return
    }
    super.onBackPressed()
}

private fun initDrawerLayoutListener() {
    mBinding.ivDrawerMenu.setOnClickListener {
        // 打开侧拉栏
        mBinding.mainDrawer.openDrawer(GravityCompat.START)
    }
    // 防止侧拉栏产生点击透传
    mBinding.clDrawer.rootView.isClickable = false
    // 添加侧拉栏状态监听
    mBinding.mainDrawer.addDrawerListener(object : DrawerLayout.DrawerListener {
        override fun onDrawerSlide(drawerView: View, slideOffset: Float) {
        }
        override fun onDrawerOpened(drawerView: View) {
            // 打开侧拉栏：首页广告隐藏、
        }
        override fun onDrawerClosed(drawerView: View) {
            // 关闭侧拉栏：首页广告隐藏、
        }
        override fun onDrawerStateChanged(newState: Int) {
        }
    })
}
```

#### 页面代码
```XML
<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/main_drawer"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    >

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/cl_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        >

        <ImageView
            android:id="@+id/ivDrawerMenu"
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:layout_marginStart="16dp"
            android:layout_marginTop="16dp"
            android:background="@drawable/ic_launcher_background"
            android:src="@drawable/ic_launcher_foreground"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/main"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            />

    </androidx.constraintlayout.widget.ConstraintLayout>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/clDrawer"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="@color/white"
        android:clickable="true"
        android:focusable="true"
        >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/drawer"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            />

    </androidx.constraintlayout.widget.ConstraintLayout>

</androidx.drawerlayout.widget.DrawerLayout>
```