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我有ViewPager，我希望它通過調用viewPager.setCurrentItem(index, true)來平滑滾動。 ViewPager由其中包含RecyclerView的片段組成。Android：Viewpager不流暢滾動
當用戶在片段的標題上向右或向左滑動，然後查看尋呼機應滾動到下一項時，我撥打setCurrentItem。但問題是視圖尋呼機不會（每次）平滑滾動到下一個片段。我嘗試了一些我在這裏找到的解決方案，但沒有真正起作用。
奇怪的是，有時（大多數時候我從右到左走）它確實平滑滾動，但大多數它不起作用。
編輯：
這裏是我的代碼：
ViewPagerFragment：
...
private void setViews(){
header.setOnTouchListener(new OnSwipeTouchListener(getContext()) {
public void onSwipeRight() {
swipeRight();
}
public void onSwipeLeft() {
swipeLeft();
}
});
}
private void swipeLeft(){
final CustomSwipeViewPager viewPager = (CustomSwipeViewPager) getActivity().findViewById(R.id.list_view_pager);
final int currentItem = viewPager.getCurrentItem();
if(currentItem < 4){
Thread sepThread = new Thread(new Runnable(){
public void run()
{
//Then, inside that thread, run a runnable on the ui thread.
//MyActivity.getContext() is a static function that returns the
//context of the activity. It's us.getContext()eful in a pinch.
getActivity().runOnUiThread(new Runnable(){
@Override
public void run() {
viewPager.setCurrentItem(currentItem + 1, true);
}
});
}
});
sepThread.start();
}
}
private void swipeRight(){
final CustomSwipeViewPager viewPager = (CustomSwipeViewPager) getActivity().findViewById(R.id.list_view_pager);
final int currentItem = viewPager.getCurrentItem();
if(currentItem > 0){
Thread sepThread = new Thread(new Runnable(){
public void run()
{
getActivity().runOnUiThread(new Runnable(){
@Override
public void run() {
viewPager.setCurrentItem(currentItem - 1, true);
}
});
}
});
sepThread.start();
}
}
...
自定義觸摸監聽器：
public class OnSwipeTouchListener implements OnTouchListener {
private final GestureDetector gestureDetector;
public OnSwipeTouchListener (Context ctx){
gestureDetector = new GestureDetector(ctx, new GestureListener());
}
@Override
public boolean onTouch(View v, MotionEvent event) {
return gestureDetector.onTouchEvent(event);
}
private final class GestureListener extends SimpleOnGestureListener {
private static final int SWIPE_THRESHOLD = 100;
private static final int SWIPE_VELOCITY_THRESHOLD = 100;
@Override
public boolean onDown(MotionEvent e) {
return true;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
boolean result = false;
try {
float diffY = e2.getY() - e1.getY();
float diffX = e2.getX() - e1.getX();
if (Math.abs(diffX) > Math.abs(diffY)) {
if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
if (diffX > 0) {
onSwipeRight();
} else {
onSwipeLeft();
}
result = true;
}
}
else if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
if (diffY > 0) {
onSwipeBottom();
} else {
onSwipeTop();
}
result = true;
}
} catch (Exception exception) {
exception.printStackTrace();
}
return result;
}
}
public void onSwipeRight() {
}
public void onSwipeLeft() {
}
public void onSwipeTop() {
}
public void onSwipeBottom() {
}
}
我希望這是你所需要的。
添加您的代碼，請 –
@MiladYarmohammadi添加代碼 – Cimoe