DrawerLayout：侧滑抽屉Core 1.20.0-alpha01

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

    <!-- 主内容：必须是第一个子 View -->
    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <!-- 抽屉：layout_gravity 决定方向 -->
    <FrameLayout
        android:layout_width="280dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="#fff" />

</androidx.drawerlayout.widget.DrawerLayout>

import androidx.drawerlayout.widget.DrawerLayout;

DrawerLayout drawer = findViewById(R.id.drawer_layout);
drawer.openDrawer(GravityCompat.START);
drawer.closeDrawer(GravityCompat.START);

// 锁定：阻止用户手势打开
drawer.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);

// 监听状态
drawer.addDrawerListener(new DrawerLayout.DrawerListener() {
    @Override
    public void onDrawerSlide(View drawerView, float slideOffset) {}
    @Override
    public void onDrawerOpened(View drawerView) {}
    @Override
    public void onDrawerClosed(View drawerView) {}
    @Override
    public void onDrawerStateChanged(int newState) {}
});