NestedScrollView inside VerticalPager doesn't work properly
0
I created this extend class from NestedScrollView to dispatch to parent (my ViewPager) the event to move the view pager when the user touch down from the scoll view. This behavior works well.
The scrollview is indicated with the red rectangle:
BUT: if the scroll view is at bottom and if I want to swipe (from the scroll view!) to the next screen (below) the viewpager doesn't do anything. How can I do that guys?
Thank you very much!
public class VerticalNestedScrollview extends NestedScrollView {
public class VerticalPagerTouchDownEvent extends BaseEvent {
}
private long mDownTime;
private final long mAreaThreshold = 60; // In pixels
private boolean mCatchMoveTouchEvent = true;
private int mDownX, mDownY, mPagesCount = 0;
private ViewPager mParentViewPager;
private boolean mIsBottomReached = false, mIsTopReached = true;
public VerticalNestedScrollview(Context context) {
super(context);
init();
}
public VerticalNestedScrollview(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public VerticalNestedScrollview(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
ViewTreeObserver observer = getViewTreeObserver();
observer.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
mParentViewPager = getViewPagerParent();
if (mParentViewPager != null) {
PagerAdapter pagerAdapter = mParentViewPager.getAdapter();
mPagesCount = pagerAdapter.getCount();
}
int contentHeight = getChildAt(0).getHeight();
mCatchMoveTouchEvent = getHeight() < contentHeight + getPaddingTop() + getPaddingBottom();
}
});
}
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
refreshTopBottomReachedInfos();
super.onScrollChanged(l, t, oldl, oldt);
}
private void refreshTopBottomReachedInfos() {
mIsTopReached = getScrollY() == 0;
// Grab the last child placed in the ScrollView, we need it to determinate the bottom position.
View view = getChildAt(getChildCount() - 1);
// Calculate the scroll diff
int diff = (view.getBottom() - (getHeight() + getScrollY())) + getPaddingBottom();
// if diff is zero, then the bottom has been reached
mIsBottomReached = diff <= 0;
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
if (mCatchMoveTouchEvent) {
if (ev.getAction() == MotionEvent.ACTION_DOWN) {
mDownTime = SystemClock.uptimeMillis();
mDownX = (int) ev.getRawX();
mDownY = (int) ev.getRawY();
refreshTopBottomReachedInfos();
} else if (ev.getAction() == MotionEvent.ACTION_MOVE) {
Rect rect = new Rect();
getHitRect(rect);
rect.bottom += mAreaThreshold;
rect.top -= mAreaThreshold;
boolean isDownSwipe = mDownY > (int) ev.getRawY();
// The move action is outside this scrollview
if (!rect.contains((int) ev.getX(), (int) ev.getY())) {
dispatchTouchDownToViewPager(ev, isDownSwipe, 0);
return true;
}
} else {
mIsBottomReached = false;
mIsTopReached = false;
}
return super.dispatchTouchEvent(ev);
} else {
return true;
}
}
private boolean checkDispatchValidity(boolean isDownSwipe) {
if (isDownSwipe && mParentViewPager != null &&
mParentViewPager.getCurrentItem() == mPagesCount - 1)
return false;
if (!isDownSwipe && mParentViewPager != null &&
mParentViewPager.getCurrentItem() == 0)
return false;
return true;
}
private void dispatchTouchDownToViewPager(MotionEvent ev, boolean isDownSwipe, long deltaY) {
if (checkDispatchValidity(isDownSwipe)) {
MotionEvent motionEvent = MotionEvent.obtain(
mDownTime,
SystemClock.uptimeMillis() + 1000,
MotionEvent.ACTION_DOWN, (int) ev.getRawX(),
(int) ev.getRawY() - deltaY, 0
);
if (mParentViewPager != null) {
mParentViewPager.dispatchTouchEvent(motionEvent);
EventBus.getDefault().post(new VerticalPagerTouchDownEvent());
}
}
}
private ViewPager getViewPagerParent() {
ViewParent parent = getParent();
do {
if (parent instanceof ViewPager) {
return ((ViewPager) parent);
}
parent = parent.getParent();
} while (parent != null);
return null;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
super.onTouchEvent(ev);
return true;
}
}
android android-viewpager android-nestedscrollview asked Nov 25 '18 at 16:29
anthonyanthony
2,63862458
add a comment |
0
I created this extend class from NestedScrollView to dispatch to parent (my ViewPager) the event to move the view pager when the user touch down from the scoll view. This behavior works well.
The scrollview is indicated with the red rectangle:
BUT: if the scroll view is at bottom and if I want to swipe (from the scroll view!) to the next screen (below) the viewpager doesn't do anything. How can I do that guys?
Thank you very much!
public class VerticalNestedScrollview extends NestedScrollView {
public class VerticalPagerTouchDownEvent extends BaseEvent {
}
private long mDownTime;
private final long mAreaThreshold = 60; // In pixels
private boolean mCatchMoveTouchEvent = true;
private int mDownX, mDownY, mPagesCount = 0;
private ViewPager mParentViewPager;
private boolean mIsBottomReached = false, mIsTopReached = true;
public VerticalNestedScrollview(Context context) {
super(context);
init();
}
public VerticalNestedScrollview(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public VerticalNestedScrollview(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
ViewTreeObserver observer = getViewTreeObserver();
observer.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
mParentViewPager = getViewPagerParent();
if (mParentViewPager != null) {
PagerAdapter pagerAdapter = mParentViewPager.getAdapter();
mPagesCount = pagerAdapter.getCount();
}
int contentHeight = getChildAt(0).getHeight();
mCatchMoveTouchEvent = getHeight() < contentHeight + getPaddingTop() + getPaddingBottom();
}
});
}
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
refreshTopBottomReachedInfos();
super.onScrollChanged(l, t, oldl, oldt);
}
private void refreshTopBottomReachedInfos() {
mIsTopReached = getScrollY() == 0;
// Grab the last child placed in the ScrollView, we need it to determinate the bottom position.
View view = getChildAt(getChildCount() - 1);
// Calculate the scroll diff
int diff = (view.getBottom() - (getHeight() + getScrollY())) + getPaddingBottom();
// if diff is zero, then the bottom has been reached
mIsBottomReached = diff <= 0;
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
if (mCatchMoveTouchEvent) {
if (ev.getAction() == MotionEvent.ACTION_DOWN) {
mDownTime = SystemClock.uptimeMillis();
mDownX = (int) ev.getRawX();
mDownY = (int) ev.getRawY();
refreshTopBottomReachedInfos();
} else if (ev.getAction() == MotionEvent.ACTION_MOVE) {
Rect rect = new Rect();
getHitRect(rect);
rect.bottom += mAreaThreshold;
rect.top -= mAreaThreshold;
boolean isDownSwipe = mDownY > (int) ev.getRawY();
// The move action is outside this scrollview
if (!rect.contains((int) ev.getX(), (int) ev.getY())) {
dispatchTouchDownToViewPager(ev, isDownSwipe, 0);
return true;
}
} else {
mIsBottomReached = false;
mIsTopReached = false;
}
return super.dispatchTouchEvent(ev);
} else {
return true;
}
}
private boolean checkDispatchValidity(boolean isDownSwipe) {
if (isDownSwipe && mParentViewPager != null &&
mParentViewPager.getCurrentItem() == mPagesCount - 1)
return false;
if (!isDownSwipe && mParentViewPager != null &&
mParentViewPager.getCurrentItem() == 0)
return false;
return true;
}
private void dispatchTouchDownToViewPager(MotionEvent ev, boolean isDownSwipe, long deltaY) {
if (checkDispatchValidity(isDownSwipe)) {
MotionEvent motionEvent = MotionEvent.obtain(
mDownTime,
SystemClock.uptimeMillis() + 1000,
MotionEvent.ACTION_DOWN, (int) ev.getRawX(),
(int) ev.getRawY() - deltaY, 0
);
if (mParentViewPager != null) {
mParentViewPager.dispatchTouchEvent(motionEvent);
EventBus.getDefault().post(new VerticalPagerTouchDownEvent());
}
}
}
private ViewPager getViewPagerParent() {
ViewParent parent = getParent();
do {
if (parent instanceof ViewPager) {
return ((ViewPager) parent);
}
parent = parent.getParent();
} while (parent != null);
return null;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
super.onTouchEvent(ev);
return true;
}
}
asked Nov 25 '18 at 16:29
anthonyanthony
2,63862458
add a comment |
0
0
0
I created this extend class from NestedScrollView to dispatch to parent (my ViewPager) the event to move the view pager when the user touch down from the scoll view. This behavior works well.
The scrollview is indicated with the red rectangle:
BUT: if the scroll view is at bottom and if I want to swipe (from the scroll view!) to the next screen (below) the viewpager doesn't do anything. How can I do that guys?
Thank you very much!
public class VerticalNestedScrollview extends NestedScrollView {
public class VerticalPagerTouchDownEvent extends BaseEvent {
}
private long mDownTime;
private final long mAreaThreshold = 60; // In pixels
private boolean mCatchMoveTouchEvent = true;
private int mDownX, mDownY, mPagesCount = 0;
private ViewPager mParentViewPager;
private boolean mIsBottomReached = false, mIsTopReached = true;
public VerticalNestedScrollview(Context context) {
super(context);
init();
}
public VerticalNestedScrollview(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public VerticalNestedScrollview(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
ViewTreeObserver observer = getViewTreeObserver();
observer.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
mParentViewPager = getViewPagerParent();
if (mParentViewPager != null) {
PagerAdapter pagerAdapter = mParentViewPager.getAdapter();
mPagesCount = pagerAdapter.getCount();
}
int contentHeight = getChildAt(0).getHeight();
mCatchMoveTouchEvent = getHeight() < contentHeight + getPaddingTop() + getPaddingBottom();
}
});
}
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
refreshTopBottomReachedInfos();
super.onScrollChanged(l, t, oldl, oldt);
}
private void refreshTopBottomReachedInfos() {
mIsTopReached = getScrollY() == 0;
// Grab the last child placed in the ScrollView, we need it to determinate the bottom position.
View view = getChildAt(getChildCount() - 1);
// Calculate the scroll diff
int diff = (view.getBottom() - (getHeight() + getScrollY())) + getPaddingBottom();
// if diff is zero, then the bottom has been reached
mIsBottomReached = diff <= 0;
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
if (mCatchMoveTouchEvent) {
if (ev.getAction() == MotionEvent.ACTION_DOWN) {
mDownTime = SystemClock.uptimeMillis();
mDownX = (int) ev.getRawX();
mDownY = (int) ev.getRawY();
refreshTopBottomReachedInfos();
} else if (ev.getAction() == MotionEvent.ACTION_MOVE) {
Rect rect = new Rect();
getHitRect(rect);
rect.bottom += mAreaThreshold;
rect.top -= mAreaThreshold;
boolean isDownSwipe = mDownY > (int) ev.getRawY();
// The move action is outside this scrollview
if (!rect.contains((int) ev.getX(), (int) ev.getY())) {
dispatchTouchDownToViewPager(ev, isDownSwipe, 0);
return true;
}
} else {
mIsBottomReached = false;
mIsTopReached = false;
}
return super.dispatchTouchEvent(ev);
} else {
return true;
}
}
private boolean checkDispatchValidity(boolean isDownSwipe) {
if (isDownSwipe && mParentViewPager != null &&
mParentViewPager.getCurrentItem() == mPagesCount - 1)
return false;
if (!isDownSwipe && mParentViewPager != null &&
mParentViewPager.getCurrentItem() == 0)
return false;
return true;
}
private void dispatchTouchDownToViewPager(MotionEvent ev, boolean isDownSwipe, long deltaY) {
if (checkDispatchValidity(isDownSwipe)) {
MotionEvent motionEvent = MotionEvent.obtain(
mDownTime,
SystemClock.uptimeMillis() + 1000,
MotionEvent.ACTION_DOWN, (int) ev.getRawX(),
(int) ev.getRawY() - deltaY, 0
);
if (mParentViewPager != null) {
mParentViewPager.dispatchTouchEvent(motionEvent);
EventBus.getDefault().post(new VerticalPagerTouchDownEvent());
}
}
}
private ViewPager getViewPagerParent() {
ViewParent parent = getParent();
do {
if (parent instanceof ViewPager) {
return ((ViewPager) parent);
}
parent = parent.getParent();
} while (parent != null);
return null;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
super.onTouchEvent(ev);
return true;
}
}
asked Nov 25 '18 at 16:29
anthonyanthony
2,63862458
I created this extend class from NestedScrollView to dispatch to parent (my ViewPager) the event to move the view pager when the user touch down from the scoll view. This behavior works well.
The scrollview is indicated with the red rectangle:
BUT: if the scroll view is at bottom and if I want to swipe (from the scroll view!) to the next screen (below) the viewpager doesn't do anything. How can I do that guys?
Thank you very much!
public class VerticalNestedScrollview extends NestedScrollView {
public class VerticalPagerTouchDownEvent extends BaseEvent {
}
private long mDownTime;
private final long mAreaThreshold = 60; // In pixels
private boolean mCatchMoveTouchEvent = true;
private int mDownX, mDownY, mPagesCount = 0;
private ViewPager mParentViewPager;
private boolean mIsBottomReached = false, mIsTopReached = true;
public VerticalNestedScrollview(Context context) {
super(context);
init();
}
public VerticalNestedScrollview(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public VerticalNestedScrollview(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
ViewTreeObserver observer = getViewTreeObserver();
observer.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
mParentViewPager = getViewPagerParent();
if (mParentViewPager != null) {
PagerAdapter pagerAdapter = mParentViewPager.getAdapter();
mPagesCount = pagerAdapter.getCount();
}
int contentHeight = getChildAt(0).getHeight();
mCatchMoveTouchEvent = getHeight() < contentHeight + getPaddingTop() + getPaddingBottom();
}
});
}
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
refreshTopBottomReachedInfos();
super.onScrollChanged(l, t, oldl, oldt);
}
private void refreshTopBottomReachedInfos() {
mIsTopReached = getScrollY() == 0;
// Grab the last child placed in the ScrollView, we need it to determinate the bottom position.
View view = getChildAt(getChildCount() - 1);
// Calculate the scroll diff
int diff = (view.getBottom() - (getHeight() + getScrollY())) + getPaddingBottom();
// if diff is zero, then the bottom has been reached
mIsBottomReached = diff <= 0;
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
if (mCatchMoveTouchEvent) {
if (ev.getAction() == MotionEvent.ACTION_DOWN) {
mDownTime = SystemClock.uptimeMillis();
mDownX = (int) ev.getRawX();
mDownY = (int) ev.getRawY();
refreshTopBottomReachedInfos();
} else if (ev.getAction() == MotionEvent.ACTION_MOVE) {
Rect rect = new Rect();
getHitRect(rect);
rect.bottom += mAreaThreshold;
rect.top -= mAreaThreshold;
boolean isDownSwipe = mDownY > (int) ev.getRawY();
// The move action is outside this scrollview
if (!rect.contains((int) ev.getX(), (int) ev.getY())) {
dispatchTouchDownToViewPager(ev, isDownSwipe, 0);
return true;
}
} else {
mIsBottomReached = false;
mIsTopReached = false;
}
return super.dispatchTouchEvent(ev);
} else {
return true;
}
}
private boolean checkDispatchValidity(boolean isDownSwipe) {
if (isDownSwipe && mParentViewPager != null &&
mParentViewPager.getCurrentItem() == mPagesCount - 1)
return false;
if (!isDownSwipe && mParentViewPager != null &&
mParentViewPager.getCurrentItem() == 0)
return false;
return true;
}
private void dispatchTouchDownToViewPager(MotionEvent ev, boolean isDownSwipe, long deltaY) {
if (checkDispatchValidity(isDownSwipe)) {
MotionEvent motionEvent = MotionEvent.obtain(
mDownTime,
SystemClock.uptimeMillis() + 1000,
MotionEvent.ACTION_DOWN, (int) ev.getRawX(),
(int) ev.getRawY() - deltaY, 0
);
if (mParentViewPager != null) {
mParentViewPager.dispatchTouchEvent(motionEvent);
EventBus.getDefault().post(new VerticalPagerTouchDownEvent());
}
}
}
private ViewPager getViewPagerParent() {
ViewParent parent = getParent();
do {
if (parent instanceof ViewPager) {
return ((ViewPager) parent);
}
parent = parent.getParent();
} while (parent != null);
return null;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
super.onTouchEvent(ev);
return true;
}
}
asked Nov 25 '18 at 16:29
anthonyanthony
2,63862458
asked Nov 25 '18 at 16:29
anthonyanthony
2,63862458
asked Nov 25 '18 at 16:29
anthonyanthony
2,63862458
asked Nov 25 '18 at 16:29
anthonyanthony
2,63862458
asked Nov 25 '18 at 16:29
anthonyanthony
2,63862458
2,63862458
add a comment |
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53469538%2fnestedscrollview-inside-verticalpager-doesnt-work-properly%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
draft saved
draft discarded
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53469538%2fnestedscrollview-inside-verticalpager-doesnt-work-properly%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
