onClick method not working properly after NestedScrollView scrolled

Question

I used NestedScrollView with CoordinatorLayout to enable scroll animation for Toolbar (by app:layout_scrollFlags="scroll|enterAlways").

NestedScrollView contain the LinearLayout as the root child, I put the 2 TextViews into LinearLayout to enable expand/collapse animation. The one was set Visible and other one was set to Gone. And switching visibility by onClick event of LinearLayout

Normally, everything work as expected but when I scrolled the NestedScrollView the onClick event not working properly. I need double click after scroll to get expand/collapse animation

Does anyone have same problem with me ? Please help me

<android.support.design.widget.CoordinatorLayout 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.support.v4.widget.NestedScrollView     android:layout_width="match_parent"     android:layout_height="match_parent"     app:layout_behavior="@string/appbar_scrolling_view_behavior">      <LinearLayout         android:layout_width="match_parent"         android:layout_height="match_parent"         android:orientation="vertical"         android:paddingBottom="98dp"         android:paddingLeft="24dp"         android:paddingRight="24dp">          <android.support.v7.widget.AppCompatTextView             android:id="@+id/detail_expense_reason_trim"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:singleLine="false"             android:textColor="@color/add_new_expense_text_color" />          <android.support.v7.widget.AppCompatTextView             android:id="@+id/detail_expense_reason"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:singleLine="false"             android:textColor="@color/add_new_expense_text_color"             android:visibility="gone" />     </LinearLayout>  </android.support.v4.widget.NestedScrollView>  <android.support.design.widget.AppBarLayout     android:layout_width="match_parent"     android:layout_height="wrap_content">      <android.support.v7.widget.Toolbar         android:id="@+id/detail_expense_toolbar"         android:layout_width="match_parent"         android:layout_height="?attr/actionBarSize"         android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"         app:layout_scrollFlags="scroll|enterAlways"         app:popupTheme="@style/ThemeOverlay.AppCompat.Light" /> </android.support.design.widget.AppBarLayout> 

 @InjectView(R.id.detail_expense_reason) AppCompatTextView originalReason;  @InjectView(R.id.detail_expense_reason_trim) AppCompatTextView trimReason;  @InjectView(R.id.detail_expense_container) LinearLayout expenseContainer; 

// Handle event

public void onClick() {     if (originalReason.getVisibility() == View.VISIBLE) {         originalReason.setVisibility(View.GONE);         trimReason.setVisibility(View.VISIBLE);     } else {         originalReason.setVisibility(View.VISIBLE);         trimReason.setVisibility(View.GONE);     }  } 

Answer 1

I found solution for same problem on this thread :The item inside RecyclerView can't be clicked right after scrolling

You can fix your code by adding layout_behavior to your AppBarLayout.You can find code here Fixed AppBarLayout.Behavior .Just add this class tou your project and fix your code :

<android.support.design.widget.AppBarLayout android:layout_width="match_parent" app:layout_behavior="yourPackageName.FixAppBarLayoutBehavior" android:layout_height="wrap_content">

Answer 2

It is a bug of the NestedScrollView, the detail of the bug can be found in here: issue. The problem is that mScroller.isFinished() in onInterceptTouchEvent(MotionEvent ev) will not return true after a fling operation (even if the fling is stopped). Therefore the touch event is intercepted.

This bug have been reported for a while, but still have not been fixed. So I have created by own version of bug fix for this problem. I implemented my own NestedScrollView, copied all the code from NestedScrollView and having the with the following amendments:

public class NestedScrollView extends FrameLayout implements NestedScrollingParent, NestedScrollingChild {     ...     private void initScrollView() {         ...         // replace this line:         // mScroller = new ScrollerCompat(getContext(), null);         mScroller = ScrollerCompat.create(getContext(), null);         ...     }      @Override     public boolean onInterceptTouchEvent(MotionEvent ev) {         ...         switch (action & MotionEventCompat.ACTION_MASK) {             ...             case MotionEvent.ACTION_DOWN: {                 ...                 // replace this line:                 // mIsBeingDragged = !mScroller.isFinished();                 mIsBeingDragged = false;                 ...             }         }     }    } 

And this NestedScrollView should have the same behaviour as the original one.