滚动firebase Recyclerview在scrollview中插入最后一项

Question

我已经通过堆栈溢出的几个解决方案，但无法实现所需的结果。我有一个评论部分的firebase recyclerview。 firebase recyclerview存在于滚动视图中，因为我滚动布局的其他部分以及正常的firebase recyclerview。我设置了RecyclerView.setNestedScrollingEnabled(false)，因此scrollview可以顺利滚动。现在我能够成功滚动出布局但我的问题只出现在我进入活动时，布局从顶部显示，这是我不想要的东西。我希望firebase recyclerview或滚动视图显示在底部的最后一项。此外，我希望RecyclerView在用户输入新评论时自动滚动到最后一个项目位置

任何帮助将不胜感激，谢谢

以下是我的代码

oncreate里面的代码用于初始化

        replyInDetailCommentsRecyclerView = findViewById(R.id.replyInDetailCommentsRecyclerView);
    linearLayoutManager1 = new LinearLayoutManager(this);
    replyInDetailCommentsRecyclerView.setLayoutManager(linearLayoutManager1);
    replyInDetailCommentsRecyclerView.setNestedScrollingEnabled(false);

firebase recyclerview中的代码，我只添加了问题的相关部分。希望能帮助到你

     adapter1.startListening();
    adapter1.notifyDataSetChanged();
    adapter1.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
        @Override
        public void onItemRangeInserted(int positionStart, int itemCount) {
            super.onItemRangeInserted(positionStart, itemCount);
            int friendlyMessageCount = adapter1.getItemCount();
            int lastVisiblePosition =
                    linearLayoutManager1.findLastCompletelyVisibleItemPosition();

            if (lastVisiblePosition == -1 ||
                    (positionStart >= (friendlyMessageCount - 1) &&
                            lastVisiblePosition == (positionStart - 1))) {
                linearLayoutManager1.scrollToPosition(positionStart);
            } else {
                replyInDetailCommentsRecyclerView.scrollToPosition(adapter1.getItemCount() - 1);
            }
        }
    });


    replyInDetailCommentsRecyclerView.setAdapter(adapter1);
    adapter1.notifyDataSetChanged();

我的XML代码

   <ScrollView
    android:layout_below="@+id/RelativeLayout1"
    android:layout_width="match_parent"
    android:fillViewport="true"
    android:fitsSystemWindows="true"
    android:layout_marginBottom="50dp"
    android:layout_height="match_parent">






<RelativeLayout
    android:id="@+id/RelativeLayout5"
    android:layout_width="match_parent"
    android:layout_below="@id/RelativeLayout1"
    android:layout_height="wrap_content">



<RelativeLayout
    android:id="@+id/RelativeLayout2"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@id/RelativeLayout4">


    <android.support.v7.widget.RecyclerView
        android:id="@+id/replyInDetailCommentsRecyclerView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">




    </android.support.v7.widget.RecyclerView>










</RelativeLayout>




<RelativeLayout
    android:id="@+id/RelativeLayout4"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">


    <de.hdodenhof.circleimageview.CircleImageView
        android:id="@+id/imageInDetailComments"
        android:layout_width="30dp"
        android:src="@drawable/profile"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"

        android:layout_height="30dp"/>

    <android.support.v7.widget.AppCompatTextView
        android:id="@+id/nameInDetailComments"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="14sp"
        android:textStyle="bold"
        android:layout_alignTop="@+id/imageInDetailComments"
        tools:text="Saqib"

        android:layout_toRightOf="@+id/imageInDetailComments"
        android:layout_marginLeft="5dp"

        android:textColor="#096697"
        android:layout_toEndOf="@+id/imageInDetailComments"
        android:layout_marginStart="5dp" />

    <android.support.v7.widget.AppCompatRatingBar
        android:id="@+id/ratingInDetailComments"
        style="?android:attr/ratingBarStyleSmall"
        android:layout_width="wrap_content"
        android:max="5"
        android:numStars="5"
        android:progressBackgroundTint="@color/colorAccent"

        android:progressTint="@color/colorAccent"
        android:rating="0.0"
        android:secondaryProgressTint="@color/colorAccent"
        android:stepSize="0.0"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/imageInDetailComments"
        android:layout_marginLeft="5dp"
        android:layout_below="@+id/nameInDetailComments"

        android:layout_marginStart="5dp"
        android:layout_toEndOf="@+id/imageInDetailComments" />


    <android.support.v7.widget.AppCompatTextView
        android:id="@+id/userCommentInDetailComments"
        android:layout_width="0dp"
        android:layout_below="@+id/ratingInDetailComments"
        android:layout_alignParentRight="true"
        android:layout_toRightOf="@+id/imageInDetailComments"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:layout_marginLeft="5dp"
        android:background="#efeeee"
        android:padding="5dp"
        android:text="i can do it mate, my bidding price includes gotaskie fee"
        />



    <View
            android:layout_below="@+id/userCommentInDetailComments"
        android:layout_marginTop="8dp"
        android:id="@+id/lineAboveCommentsRecyclerView"
        android:layout_width="match_parent"
        android:layout_height="2dp"
        android:background="#dad8d8"

        />

</RelativeLayout>


</RelativeLayout>
</ScrollView>

Answer 1

您可以使用NestedScrollView而不是ScrollView