bottom view below RecyclerView in CoordinatorLayout on android

问题

I switched from ConstraintLayout to CoordinatorLayout to avoid snackbar overlapping with my bottom view. While it worked very well in a screen with only a toolbar, RecyclerView and Floating button, in the second screen i am having a really hard time to add a view below the RecyclerView while avoiding it being overlapped with the RecyclerView

My best solution yet (below) was to add paddingBottomattribute of about 80dpto the recyclerView. This looks like it solves the problem but when the snackbar is UP, the bottom view android:id="@+id/item_cl_add" again will overlap with the recyclerView. Of course, i can add more paddingBottom to compensate the size of the snackbar, but that means i will be losing about 20dp of real estate (not a good idea).

I checked many websites but could not find an simple solution

bellow is my latest code which still overlaps on snackbar

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/item_col_top"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".item.ItemActivity">

    <com.google.android.material.appbar.AppBarLayout
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
    <include
        android:id="@+id/item_toolbar"
        layout="@layout/toolbar" />
    </com.google.android.material.appbar.AppBarLayout>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/item_rv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginBottom="60dp"
        android:layout_marginTop="8dp"
        tools:listitem="@layout/list_item"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>


    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/item_cl_add"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:fitsSystemWindows="true"
        app:layout_dodgeInsetEdges="bottom"
        android:layout_gravity="bottom">

        <AutoCompleteTextView
            android:id="@+id/item_ac_add"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="8dp"
            android:layout_marginBottom="8dp"
            android:hint="@string/item_edit_text_hint"
            android:imeOptions="actionDone"
            android:inputType="text"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/item_b_add"
            app:layout_constraintTop_toTopOf="parent"
            tools:targetApi="o" />

        <Button
            android:id="@+id/item_b_add"
            android:layout_width="42dp"
            android:layout_height="42dp"
            android:layout_marginStart="8dp"
            android:background="@color/colorForeground"
            android:stateListAnimator="@null"
            android:text="+"
            android:textColor="@android:color/black"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />


    </androidx.constraintlayout.widget.ConstraintLayout>

</androidx.coordinatorlayout.widget.CoordinatorLayout>

Below is a screenshot without a snackbar (Good)

Below is a screenshot with the snackbar (not good)

回答1:

CoordinatorLayout is similar to FrameLayout, in the sense that views can overlap freely. So paddings cannot solve the problem.

If you don't want the recycler view to overlap with the bottom view, you should wrap them both in a vertical LinearLayout.

来源：https://stackoverflow.com/questions/60853999/bottom-view-below-recyclerview-in-coordinatorlayout-on-android