ViewPager 中的 ScrollView:滑动不起作用

问题描述

我有三个片段的 ViewPager，其中之一是 FrameLayout，里面有 ScrollView:

I have ViewPager with three fragments and one of them is FrameLayout with ScrollView inside:

<FrameLayout 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">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <LinearLayout
            android:id="@+id/table"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"/>
    </ScrollView>

    <Button
        android:id="@+id/buttonRemove"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/bg_button_red"
        android:layout_gravity="bottom"
        android:layout_margin="4dp"
        android:text="@string/button_remove_last_round"
        android:textColor="#ffffff"
        android:textSize="24sp"/>


</FrameLayout>

如果我在按钮上滑动，它就可以工作.但是如果我在 ScrollView 上滑动，它不起作用，只能向上/向下滚动

and if I swipe over button, it works. But if I swipe over the ScrollView, it doesn't work, only scroll up/down works

我试图覆盖 Scrollview 的 OnTouchEvent:

I tried to override OnTouchEvent of Scrollview:

@Override
public boolean onTouchEvent(MotionEvent ev) {

    switch (ev.getAction()){
        case MotionEvent.ACTION_DOWN:
            touchX = ev.getX();
            touchY = ev.getY();
            return super.onTouchEvent(ev);//if I change it to 'break', then only swipe works, but no scroll
        case MotionEvent.ACTION_MOVE:
            if(Math.abs(touchX-ev.getX())<40){
                return super.onTouchEvent(ev);//Scroll works perfectly
            }else{
                return false;//Scroll disabled, but swipe still not working
            }
        case MotionEvent.ACTION_CANCEL:
        case MotionEvent.ACTION_UP:
            touchX=0;
            touchY=0;
            break;
    }
    return false;
}

现在我可以禁用滚动，但是滑动仍然不起作用，如果X点之间的差异超过40，我将事件传递给viewpager，但是viewpager的onTouchListener没有得到这个事件；

Now I can disable scroll, but swipe still not working, if the difference between X points more than 40, I pass the event to the viewpager, but the viewpager's onTouchListener doesn't get this event;

推荐答案

好的，我在@yedidyak 的帮助下找到了解决方案.我写了我的自定义 ScrollView:

Ok, I found the solution with help of @yedidyak. I wrote my custom ScrollView:

public class CustomScrollView extends ScrollView {

float touchX = 0;
float touchY = 0;

ViewPager parentPager;

public void setParentPager(ViewPager parentPager) {
    this.parentPager = parentPager;
}

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

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

@Override
public boolean onTouchEvent(MotionEvent ev) {

    switch (ev.getActionMasked()){
        case MotionEvent.ACTION_DOWN:
            touchX = ev.getX();
            touchY = ev.getY();
            return super.onTouchEvent(ev);
        case MotionEvent.ACTION_MOVE:
            if(Math.abs(touchX-ev.getX())<40){
                return super.onTouchEvent(ev);
            }else{
                if (parentPager==null) {
                    return false;
                } else {
                    return parentPager.onTouchEvent(ev);
                }
            }
        case MotionEvent.ACTION_CANCEL:
        case MotionEvent.ACTION_UP:
            touchX=0;
            touchY=0;
            break;
    }
    return super.onTouchEvent(ev);
}
}

然后在片段中，我将 viewpager 放到这个视图中，它可以完美运行

then in the fragment I put the viewpager to this view and it works perfectly

这篇关于ViewPager 中的 ScrollView:滑动不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！