向上滚动时折叠工具栏隐藏，向下滚动时显示
在我们的聊天应用中，首先启动新消息。查看旧消息用户向上滚动。为此，我们将reverseLayout设置为true。
Ex：LayoutManager反向所以0位置是底部。当用户滚动旧消息时，假设位置为10。所以我想隐藏工具栏。当用户从10位置到9位置时，我想显示工具栏。
LinearLayoutManager linearLayoutManager = new WrapContentLinearLayoutManager(context);
linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
linearLayoutManager.setReverseLayout(true);
我们希望在用户向上滚动以获取旧消息时隐藏折叠工具栏，并在用户向下滚动时显示折叠工具栏。
有关如何实现这一目标的任何提示？
XML代码如下：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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/rlMain"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/whole_background_color"
android:orientation="vertical">
<ImageView
android:id="@+id/ivBackgroundWall"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop" />
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@+id/rlChatMessageSendView">
<android.support.design.widget.AppBarLayout
android:id="@+id/app_bar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#00000000"
app:elevation="0dp">
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_scrollFlags="scroll|enterAlways">
<include
android:id="@+id/rlZoneDetail"
layout="@layout/include_layout_zone_option" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
app:layout_behavior="com.gochat.uIUtil.FixScrollingFooterBehavior">
<RelativeLayout
android:id="@+id/rel_root_recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@+id/rlChat"
android:paddingBottom="@dimen/margin_five">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerViewChat"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:overScrollMode="never"
android:scrollbars="none"
android:visibility="visible"
tools:listitem="@layout/chat_adapter_message_layout" />
<ProgressBar
android:id="@+id/progressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:theme="@style/AppTheme.ProgressBarColor"
android:visibility="gone" />
<android.support.v7.widget.AppCompatTextView
android:id="@+id/tvFollow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="@dimen/padding_five"
android:layout_marginTop="@dimen/padding_ten"
android:background="@drawable/background_login_signup_small_radius"
android:gravity="center"
android:maxLines="1"
android:paddingBottom="@dimen/padding_five"
android:paddingLeft="@dimen/padding_twenty"
android:paddingRight="@dimen/padding_twenty"
android:paddingTop="@dimen/padding_five"
android:singleLine="true"
android:text="@string/start_follow"
android:textAllCaps="false"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@color/white"
android:textSize="@dimen/text_size_fifteen"
android:visibility="gone" />
<LinearLayout
android:id="@+id/llAnnounce"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/recyclerViewChat"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_marginBottom="@dimen/padding_five"
android:layout_marginRight="@dimen/padding_five"
android:layout_marginTop="@dimen/padding_five"
android:background="@drawable/background_login_signup_small_radius"
android:gravity="center"
android:visibility="gone">
<ImageView
android:layout_width="@dimen/padding_thirteen"
android:layout_height="@dimen/padding_thirteen"
android:layout_marginLeft="@dimen/margin_seven"
android:layout_marginStart="@dimen/margin_seven"
android:src="@drawable/iv_white_shout" />
<android.support.v7.widget.AppCompatTextView
android:id="@+id/tvAnnouncement"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="@dimen/margin_twenty"
android:layout_marginLeft="@dimen/margin_ten"
android:layout_marginRight="@dimen/margin_twenty"
android:layout_marginStart="@dimen/margin_ten"
android:gravity="center"
android:maxLines="1"
android:paddingBottom="@dimen/padding_five"
android:paddingTop="@dimen/padding_five"
android:singleLine="true"
android:text="@string/announce_text"
android:textAllCaps="false"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@color/white"
android:textSize="@dimen/text_size_thirteen"
android:visibility="visible" />
<ImageView
android:layout_width="@dimen/padding_thirteen"
android:layout_height="@dimen/padding_thirteen"
android:layout_marginEnd="@dimen/margin_seven"
android:layout_marginRight="@dimen/margin_seven"
android:src="@drawable/iv_white_send" />
</LinearLayout>
</RelativeLayout>
<LinearLayout
android:id="@+id/rlChat"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_gravity="bottom"
android:background="@color/bg_bottombar"
android:orientation="vertical"
android:visibility="visible"
app:layout_behavior="com.gochat.uIUtil.FixScrollingFooterBehavior">
<View
android:layout_width="match_parent"
android:layout_height="@dimen/onedp"
android:background="@color/create_zone_divider_color_whatsapp" />
<RelativeLayout
android:id="@+id/rl_send_message"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/bottom_tab"
android:padding="@dimen/padding_seven"
android:visibility="visible">
<RelativeLayout
android:id="@+id/rlAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:paddingBottom="@dimen/padding_ten"
android:paddingRight="@dimen/margin_eight"
android:paddingTop="@dimen/padding_ten">
<ImageView
android:id="@+id/ivAdd"
android:layout_width="@dimen/margin_twenty"
android:layout_height="@dimen/margin_twenty"
android:layout_centerVertical="true"
android:src="@drawable/iv_add_blue" />
</RelativeLayout>
<ImageView
android:id="@+id/ivFullscreen"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:src="@drawable/iv_add_blue"
android:visibility="gone" />
<ImageView
android:id="@+id/ivMenuOpen"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/rel_message"
android:layout_centerVertical="true"
android:layout_marginEnd="@dimen/margin_twenty"
android:layout_marginRight="@dimen/margin_twenty"
android:layout_toLeftOf="@+id/ivFullscreen"
android:layout_toStartOf="@+id/ivFullscreen"
android:src="@drawable/iv_menu_grid"
android:visibility="gone" />
<TextView
android:id="@+id/tv_Title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:gravity="center"
android:text="TITLE"
android:textStyle="bold"
android:visibility="gone" />
<RelativeLayout
android:id="@+id/rel_message"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toEndOf="@+id/rlAdd"
android:layout_toLeftOf="@+id/iv_send"
android:layout_toRightOf="@+id/rlAdd"
android:layout_toStartOf="@+id/iv_send"
android:background="@drawable/chat_send_message_background"
android:visibility="visible">
<RelativeLayout
android:id="@+id/rl_chat_send_message"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:orientation="horizontal">
<EditText
android:id="@+id/et_chat"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginEnd="@dimen/margin_ten"
android:layout_marginLeft="@dimen/margin_ten"
android:layout_marginRight="@dimen/margin_ten"
android:layout_marginStart="@dimen/margin_ten"
android:background="@null"
android:hint="@string/type_messsage"
android:inputType="textMultiLine"
android:maxLines="4"
android:padding="@dimen/padding_eight"
android:textColorHint="@color/hint_text_color"
android:textSize="@dimen/text_size_fifteen"
tools:text="zxnihxkbdfcdaaa" />
</RelativeLayout>
</RelativeLayout>
<ImageView
android:id="@+id/iv_send"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_margin="@dimen/margin_five"
android:src="@drawable/iv_send_message_light"
android:visibility="invisible" />
<ImageView
android:id="@+id/iv_record"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_margin="@dimen/margin_five"
android:src="@drawable/iv_audio_record"
android:visibility="visible" />
</RelativeLayout>
<FrameLayout
android:id="@+id/frame_layout"
android:layout_width="match_parent"
android:layout_height="250dp"
android:background="@color/white"
android:padding="@dimen/padding_fifteen"
android:visibility="gone" />
</LinearLayout>
</RelativeLayout>
</android.support.design.widget.CoordinatorLayout>
<RelativeLayout
android:id="@+id/rlChatMessageSendView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true">
<LinearLayout
android:id="@+id/llSpectatorZone"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginTop="@dimen/margin_ten"
android:background="@color/white"
android:orientation="horizontal"
android:padding="@dimen/padding_ten"
android:visibility="gone">
<TextView
android:id="@+id/tvSpectatorZone"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="@string/you_can_only_view_this_zone"
android:textColor="@color/unselected_item_color"
android:textSize="@dimen/text_size_seventeen" />
</LinearLayout>
</RelativeLayout>
</RelativeLayout>
1 个答案:
答案 0 :(得分：0)
相关问题
最新问题
- 我写了这段代码，但我无法理解我的错误
- 我无法从一个代码实例的列表中删除 None 值，但我可以在另一个实例中。为什么它适用于一个细分市场而不适用于另一个细分市场？
- 是否有可能使 loadstring 不可能等于打印？卢阿
- java中的random.expovariate()
- Appscript 通过会议在 Google 日历中发送电子邮件和创建活动
- 为什么我的 Onclick 箭头功能在 React 中不起作用？
- 在此代码中是否有使用“this”的替代方法？
- 在 SQL Server 和 PostgreSQL 上查询，我如何从第一个表获得第二个表的可视化
- 每千个数字得到
- 更新了城市边界 KML 文件的来源？