0
点赞
收藏
分享

微信扫一扫

android ScrollView 吸顶效果

效果图:

android ScrollView 吸顶效果_ScrollView 吸顶

  • 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"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<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 > 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);
}
}

}




举报

相关推荐

0 条评论