[英]Android: Scrollview vertical inside VerticalViewPager doesn't work properly
這是我的VerticalViewPager:
public class VerticalViewPager extends ViewPager {
public interface OnTouchListener {
void onTouchDown();
void onTouchUp();
void onTouchMove();
}
private OnTouchListener mListener;
public VerticalViewPager(Context context) {
super(context);
init();
}
public VerticalViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
// The majority of the magic happens here
setPageTransformer(true, new VerticalPageTransformer());
// The easiest way to get rid of the overscroll drawing that happens on the left and right
setOverScrollMode(OVER_SCROLL_NEVER);
}
public void setOnTouchListener(OnTouchListener listener) {
mListener = listener;
}
private class VerticalPageTransformer implements ViewPager.PageTransformer {
@Override
public void transformPage(View view, float position) {
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
view.setAlpha(0);
} else if (position <= 1) { // [-1,1]
view.setAlpha(1);
// Counteract the default slide transition
view.setTranslationX(view.getWidth() * -position);
//set Y setNum to swipe in from top
float yPosition = position * view.getHeight();
view.setTranslationY(yPosition);
} else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setAlpha(0);
}
}
}
/**
* Swaps the X and Y coordinates of your touch event.
*/
private MotionEvent swapXY(MotionEvent ev) {
float width = getWidth();
float height = getHeight();
float newX = (ev.getY() / height) * width;
float newY = (ev.getX() / width) * height;
ev.setLocation(newX, newY);
return ev;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev){
boolean intercepted = super.onInterceptTouchEvent(swapXY(ev));
swapXY(ev); // return touch coordinates to original reference frame for any child views
return intercepted;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
switch (ev.getAction() & MotionEventCompat.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
mListener.onTouchDown();
break;
case MotionEvent.ACTION_UP:
mListener.onTouchUp();
break;
case MotionEvent.ACTION_MOVE:
mListener.onTouchMove();
break;
}
return super.onTouchEvent(swapXY(ev));
}
}
我在此ViewPager中放入了一些片段。 在最后一個片段中,有一個ScrollView:
<RelativeLayout 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="@android:color/white">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
...
<ScrollView
android:id="@+id/vertical_scrollview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="none">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/keyline_4">
....
</LinearLayout>
</ScrollView>
</LinearLayout>
</RelativeLayout>
在最后一個片段中,我可以正常滾動此頁面。 但是,如果我想滑動到VerticalViewPager的上一頁,就不會發生任何事情。
謝謝大家!
不要將任何VerticalViewPager與帶有PagerSnapHelper的簡單RecyclerView一起使用,就可以像非常平滑的方式一樣實現它,並將所需的布局添加到其中。 您可以獲得更好的性能。
嘗試使用NestedScrollView
而不是ScrollView
。
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