android ScrollView 吸顶效果上划隐藏头布局

最新推荐文章于 2023-10-27 11:14:39 发布

转载最新推荐文章于 2023-10-27 11:14:39 发布 · 808 阅读

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原文链接：https://blog.youkuaiyun.com/yechaoa/article/details/86612136

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#androidui

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效果图：

图有点渣

有两个相同吸顶的View
viewA在ScrollView中
viewB与ScrollView同级
根据ScrollView滑动距离判断同级的viewB 是否显示
当滑动的距离大于viewA到顶部的距离，viewB就显示，反之隐藏

xml代码

<?xml version="1.0" encoding="utf-8"?/>
 
 <com.yechaoa.stickscrollview.MyScrollView
    android:id="@+id/scrollView"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <TextView
            android:id="@+id/tv_top_view"
            android:layout_width="match_parent"
            android:layout_height="200dp"
            android:background="@color/colorPrimary"
            android:gravity="center"
            android:padding="20dp"
            android:text="内容区"
            android:textColor="#fff"
            android:textSize="20sp"/>
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/colorAccent"
            android:gravity="center"
            android:padding="20dp"
            android:text="@string/app_name"
            android:textColor="#fff"
            android:textSize="20sp"/>

     <TextView
            android:layout_width="match_parent"
            android:layout_height="800dp"
            android:background="@color/colorPrimary"
            android:gravity="center"
            android:padding="20dp"
            android:text="内容区"
            android:textColor="#fff"
            android:textSize="20sp"/>

 </ LinearLayout>;

 </com.yechaoa.stickscrollview.MyScrollView>;

 <TextView
    android:id="@+id/tv_stick_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/colorAccent"
    android:gravity="center"
    android:padding="20dp"
    android:text="@string/app_name"
    android:textColor="#fff"
    android:textSize="20sp"
    android:visibility="gone"/>
 </RelativeLayout>

java代码

        mTopView = findViewById(R.id.tv_top_view);
        mStickView = findViewById(R.id.tv_stick_view);
        MyScrollView mScrollView = findViewById(R.id.scrollView);
    mScrollView.setScrollViewListener(new MyScrollView.ScrollViewListener() {
        @Override
        public void onScrollChanged(MyScrollView scrollView, int x, int y, int oldx, int oldy) {
            if (y &gt; mTopView.getHeight())
                mStickView.setVisibility(View.VISIBLE);
            else
                mStickView.setVisibility(View.GONE);
        }
    });

y 就是ScrollView 滑动的距离

点击到顶部：

mScrollView.scrollTo(0, mTopView.getHeight());

带滑动监听的ScrollView


package com.yechaoa.stickscrollview;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.ScrollView;

/**
 * Created by yechao on 2019/1/23.
 * Describe : 带滑动监听的scrollview
 */
 

 	public class MyScrollView extends ScrollView {

    public interface ScrollViewListener {
        void onScrollChanged(MyScrollView scrollView, int x, int y, int oldx, int oldy);
    }

    private ScrollViewListener scrollViewListener = null;

    public MyScrollView(Context context) {
        super(context);
    }

    public MyScrollView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public MyScrollView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public void setScrollViewListener(ScrollViewListener scrollViewListener) {
        this.scrollViewListener = scrollViewListener;
    }

    @Override
    protected void onScrollChanged(int x, int y, int oldx, int oldy) {
        super.onScrollChanged(x, y, oldx, oldy);
        if (scrollViewListener != null) {
            scrollViewListener.onScrollChanged(this, x, y, oldx, oldy);
        }
    }

}