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CoordinatorLayout实现自定义头条卡住的解决方案

CoordinatorLayout实现自定义头条卡住的解决方案

作者: 晓风残月酒醒 | 来源:发表于2019-09-26 13:41 被阅读0次

    废话不多说,直接上代码,xml布局如下:

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/color_ffffff">
        <!--互动详情页面布局-->
        <android.support.design.widget.AppBarLayout
            android:id="@+id/appBarLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/color_f1f1f6"
            android:stateListAnimator="@null"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
            app:layout_behavior=".view.FlingBehavior">
    
            <android.support.design.widget.CollapsingToolbarLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:minHeight="?actionBarSize"
                app:contentScrim="@color/color_ffffff"
                app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">
    
                <!-- 背景图 -->
                <ImageView
                    android:id="@+id/ivBackGround"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:src="@drawable/bg_lesson"
                    app:layout_collapseMode="parallax" />
    
                <!-- 内容 -->
                <LinearLayout
                    android:id="@+id/llTitleContent"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_marginTop="@dimen/s_50dp"
                    android:orientation="vertical"
                    app:layout_collapseMode="parallax">
                    <!--app:layout_collapseParallaxMultiplier="0.7"-->
                    <TextView
                        android:id="@+id/tvDetailName"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginLeft="@dimen/s_15dp"
                        android:layout_marginRight="@dimen/s_15dp"
                        android:lineSpacingExtra="@dimen/s_4dp"
                        android:text="@string/str_place_holder"
                        android:textColor="@color/color_333333"
                        android:textSize="@dimen/s_18sp"
                        android:textStyle="bold" />
    
                    <TextView
                        android:id="@+id/tvClassName"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginLeft="@dimen/s_15dp"
                        android:layout_marginTop="@dimen/s_12dp"
                        android:layout_marginRight="@dimen/s_15dp"
                        android:text="@string/str_place_holder"
                        android:textColor="@color/color_666666"
                        android:textSize="@dimen/s_14sp"
                        android:textStyle="normal" />
                    <!--str_release_class-->
    
                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginLeft="@dimen/s_15dp"
                        android:layout_marginRight="@dimen/s_15dp"
                        android:orientation="horizontal">
    
                        <TextView
                            android:id="@+id/tvAccessCode"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:text="@string/str_place_holder"
                            android:textColor="@color/color_666666"
                            android:textSize="@dimen/s_14sp"
                            android:textStyle="normal" />
                        <!--str_assess_code-->
    
                        <TextView
                            android:id="@+id/tvCopyAccessCode"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:paddingLeft="@dimen/s_15sp"
                            android:paddingTop="@dimen/s_12dp"
                            android:paddingRight="@dimen/s_15sp"
                            android:paddingBottom="@dimen/s_12dp"
                            android:text="复制"
                            android:textColor="@color/color_2b96ff"
                            android:textSize="@dimen/s_14sp" />
                    </LinearLayout>
    
                    <RelativeLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginLeft="@dimen/s_15dp"
                        android:layout_marginRight="@dimen/s_15dp"
                        android:layout_marginBottom="@dimen/s_20dp">
    
                        <TextView
                            android:id="@+id/tvAccessMemberCount"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_centerVertical="true"
                            android:text="0"
                            android:textColor="@color/color_ff9100"
                            android:textSize="@dimen/s_20sp"
                            android:textStyle="bold" />
    
                        <TextView
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_alignBaseline="@+id/tvAccessMemberCount"
                            android:layout_toRightOf="@+id/tvAccessMemberCount"
                            android:text="人参与"
                            android:textColor="@color/color_666666"
                            android:textSize="@dimen/s_14sp" />
    
                        <android.support.v7.widget.RecyclerView
                            android:id="@+id/rvAccessMemberList"
                            android:layout_width="wrap_content"
                            android:layout_height="@dimen/s_28dp"
                            android:layout_alignParentRight="true" />
                    </RelativeLayout>
    
                    <!--脚下的圆角占位布局-->
                    <View
                        android:layout_width="match_parent"
                        android:layout_height="@dimen/s_10dp"
                        android:background="@drawable/shape_ffffff_top_left_right_5dp" />
                </LinearLayout>
    
                <!-- 一级标题 -->
                <android.support.v7.widget.Toolbar
                    android:id="@+id/tbFirstTitle"
                    android:layout_width="match_parent"
                    android:layout_height="@dimen/s_44dp"
                    android:background="@android:color/transparent"
                    app:contentInsetStart="0dp"
                    app:layout_collapseMode="pin"
                    app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
                    app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
    
                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="@dimen/s_44dp"
                        android:orientation="horizontal">
    
                        <ImageView
                            android:id="@+id/ivBack"
                            android:layout_width="wrap_content"
                            android:layout_height="match_parent"
                            android:paddingLeft="@dimen/s_15dp"
                            android:paddingRight="@dimen/s_15dp"
                            android:src="@drawable/nav_btn_back" />
    
                        <TextView
                            android:id="@+id/tvTitle"
                            android:layout_width="0dp"
                            android:layout_height="match_parent"
                            android:layout_weight="1"
                            android:gravity="center"
                            android:textColor="@color/color_333333"
                            android:textSize="@dimen/s_18sp"
                            android:textStyle="bold" />
    
                        <ImageView
                            android:id="@+id/ivShare"
                            android:layout_width="wrap_content"
                            android:layout_height="match_parent"
                            android:paddingLeft="@dimen/s_15dp"
                            android:paddingRight="@dimen/s_15dp"
                            android:src="@drawable/lesson_share_selector"
                            android:visibility="invisible" />
                    </LinearLayout>
                </android.support.v7.widget.Toolbar>
            </android.support.design.widget.CollapsingToolbarLayout>
    
            <!-- 二级标题 -->
            <RelativeLayout
                android:id="@+id/rlSecondTitle"
                android:layout_width="match_parent"
                android:layout_height="@dimen/s_44dp"
                android:layout_gravity="bottom"
                android:background="@color/color_ffffff">
    
                <TextView
                    android:id="@+id/tvCourseSummary"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerVertical="true"
                    android:layout_marginLeft="@dimen/s_15dp"
                    android:text="课程小节"
                    android:textColor="@color/color_333333"
                    android:textSize="@dimen/s_16sp"
                    android:textStyle="bold" />
    
                <TextView
                    android:id="@+id/tvCount"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerVertical="true"
                    android:layout_toRightOf="@+id/tvCourseSummary"
                    android:text="@string/str_place_holder"
                    android:textColor="@color/color_999999"
                    android:textSize="@dimen/s_14sp" />
            </RelativeLayout>
        </android.support.design.widget.AppBarLayout>
    
        <!--单个item布局:layout_interactive_detail_first_item-->
        <!--单个item布局:layout_interactive_detail_second_item-->
        <android.support.v7.widget.RecyclerView
            android:id="@+id/rvContentList"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:nestedScrollingEnabled="true"
            android:orientation="vertical"
            android:overScrollMode="never"
            android:scrollbars="none"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />
    
        <TextView
            android:id="@+id/tvContentEmpty"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:clickable="false"
            android:drawableTop="@drawable/balnk_file"
            android:drawablePadding="@dimen/s_13dp"
            android:enabled="false"
            android:focusable="false"
            android:focusableInTouchMode="false"
            android:gravity="center_horizontal"
            android:nestedScrollingEnabled="true"
            android:paddingTop="@dimen/s_50dp"
            android:paddingBottom="@dimen/s_50dp"
            android:text="暂无内容"
            android:textColor="@color/color_bbbbbb"
            android:textSize="@dimen/s_15sp"
            android:visibility="gone"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />
    </android.support.design.widget.CoordinatorLayout>
    

    效果图如下:


    展开状态.jpg
    收起状态.jpg

    需要针对RecyclerView添加滚动监听器,当RecyclerView停下来的时候判定它距离屏幕顶部的高度,然后让appBarLayout执行展开或者收起,这样就能够规避掉RecyclerView和CoordinatorLayout组合发生抖动之后卡住不动的问题,具体代码如下:

    // 添加顶部滑动监听器
    if (appBarOffsetListener == null) {
        appBarOffsetListener = new AppBarLayout.OnOffsetChangedListener() {
            @Override
            public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
                if (llTitleContent != null && tvTitle != null) {
                    if (verticalOffset <= -llTitleContent.getHeight() / 2) {
                        tvTitle.setText("互动课程详情");
                    } else {
                        tvTitle.setText("");
                    }
                }
            }
        };
    }
    // 头条发生拖动时,需要变换主标题
    appBarLayout.addOnOffsetChangedListener(appBarOffsetListener);
    // 设置内容滚动监听器
    if (scrollListener == null) {
        scrollListener = new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                // 如果当前处于空闲状态,那么可以执行判定操作
                if (newState == RecyclerView.SCROLL_STATE_IDLE && rvContentList != null) {
                    int[] location = new int[2];
                    rvContentList.getLocationInWindow(location);
                    // 两个标题栏的高度(一级标题和二级标题的高度) 加上 状态栏的高度就是recyclerView距离屏幕顶部可能到达最近的距离
                    float minY = titleHeight * 2 + statusHeight;
                    // 如果当前recyclerView距离最高位置小于5个像素,那么认为应该关闭,否则打开
                    if (location[1] - minY <= 5) {
                        if (appBarLayout != null) {
                            appBarLayout.setExpanded(false, true);
                        }
                    }
                    // 否则打开整体布局
                    else if (appBarLayout != null) {
                        appBarLayout.setExpanded(true, true);
                    }
                }
            }
        };
    }
    // 添加滚动监听器,防止卡顿的发生
    rvContentList.addOnScrollListener(scrollListener);
    

    下面这个FlingBehavior 主要用于解决RecyclerView滑动之后,第一次点击发生失效的问题

    import android.content.Context;
    import android.support.design.widget.AppBarLayout;
    import android.support.design.widget.CoordinatorLayout;
    import android.support.v4.view.ViewCompat;
    import android.support.v7.widget.RecyclerView;
    import android.util.AttributeSet;
    import android.view.View;
    
    /**
     * 用于解决CoordinatorLayout与RecyclerView之间发生的点击问题
     */
    public class FlingBehavior extends AppBarLayout.Behavior {
    
        public FlingBehavior() {
        }
    
        public FlingBehavior(Context context, AttributeSet attrs) {
            super(context, attrs);
        }
    
        @Override
        public void onNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed, int type) {
            super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, type);
            stopNestedScrollIfNeeded(dyUnconsumed, child, target, type);
        }
    
        @Override
        public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, View target, int dx, int dy, int[] consumed, int type) {
            super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed, type);
            stopNestedScrollIfNeeded(dy, child, target, type);
        }
    
        private void stopNestedScrollIfNeeded(int dy, AppBarLayout child, View target, int type) {
            if (type == ViewCompat.TYPE_NON_TOUCH) {
                final int currOffset = getTopAndBottomOffset();
                if ((dy < 0 && currOffset == 0) || (dy > 0 && currOffset == -child.getTotalScrollRange())) {
                    ViewCompat.stopNestedScroll(target, ViewCompat.TYPE_NON_TOUCH);
                }
            }
        }
    }
    

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          本文标题:CoordinatorLayout实现自定义头条卡住的解决方案

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