android - Android 的双向 ScrollView

Question

我需要一个双向 ScrollView ，其中添加了捏合和缩放手势。是否建议使用带有水平 ScrollView 的 ScrollView 作为其 subview ，或者自定义实现是唯一的解决方案？

Answer 1

严。 Yurkin 回答了类似的问题。您不需要自定义 View ，但必须处理触摸事件。 Yan 的这个解决方案适用于水平 ScrollView 内的垂直 ScrollView :

There is much more simpler solution than creating a custom view:

布局:

<HorizontalScrollView xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/scrollHorizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <ScrollView 
        android:id="@+id/scrollVertical"
        android:layout_width="wrap_content"
        android:layout_height="match_parent" >

        <WateverViewYouWant/>

    </ScrollView>
</HorizontalScrollView>

代码(onCreate/onCreateView):

final HorizontalScrollView hScroll = (HorizontalScrollView) value.findViewById(R.id.scrollHorizontal);
final ScrollView vScroll = (ScrollView) value.findViewById(R.id.scrollVertical);
vScroll.setOnTouchListener(new View.OnTouchListener() { //inner scroll listener         
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        return false;
    }
});
hScroll.setOnTouchListener(new View.OnTouchListener() { //outer scroll listener         
    private float mx, my, curX, curY;
    private boolean started = false;

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        curX = event.getX();
        curY = event.getY();
        int dx = (int) (mx - curX);
        int dy = (int) (my - curY);
        switch (event.getAction()) {
            case MotionEvent.ACTION_MOVE:
                if (started) {
                    vScroll.scrollBy(0, dy);
                    hScroll.scrollBy(dx, 0);
                } else {
                    started = true;
                }
                mx = curX;
                my = curY;
                break;
            case MotionEvent.ACTION_UP: 
                vScroll.scrollBy(0, dy);
                hScroll.scrollBy(dx, 0);
                started = false;
                break;
        }
        return true;
    }
});

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