Scroll touchscreen area in Android 6

Question

I am observing new behavior in Android 6.0 Marshmallow. The touching area of ​​the scrollbar is larger than the scrollbar. This can be seen in the following screenshot. The scrollbar has 20 dp (green area), and the touch zone is probably 48 dp (blue and green area). I would like the touch area to be above the scrollbar:

I am using the following:

<resources xmlns:android="http://schemas.android.com/apk/res/android"> <style name="MyTheme.Dark" parent="android:Theme.Black"> <item name="android:fastScrollStyle">@style/Widget.FastScroll</item> <item name="android:scrollbarThumbVertical">@drawable/dark_scrollbar_thumb</item> <item name="android:scrollbarTrackVertical">@drawable/dark_scrollbar_track</item> <item name="android:scrollbarSize">4dp</item> <item name="android:fastScrollThumbDrawable">@drawable/dark_scrollbar_fast_thumb</item> <item name="android:fastScrollTrackDrawable">@drawable/dark_scrollbar_fast_track</item> </style> <style name="Widget.FastScroll" parent="android:Widget.Material.FastScroll"> </style> </resources> 

dark_scrollbar_fast_thumb.xml:

 <?xml version="1.0" encoding="utf-8"?> <layer-list xmlns:android="http://schemas.android.com/apk/res/android" > <item> <shape> <size android:height="30dp" android:width="20dp" /> <solid android:color="@android:color/transparent" /> </shape> </item> <item android:left="8dp" android:right="8dp"> <shape> <size android:height="30dp" android:width="4dp" /> <solid android:color="@color/dark_secondary" /> </shape> </item> </layer-list> 

dark_scrollbar_fast_track.xml:

 <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" > <size android:width="@dimen/1dp" /> <solid android:color="@color/dark_scrollbar_track" /> </shape> 

dark_scrollbar_fast_thumb.xml:

 <item> <shape> <size android:height="30dp" android:width="20dp" /> <solid android:color="@android:color/transparent" /> </shape> </item> <item android:left="8dp" android:right="8dp"> <shape> <size android:height="30dp" android:width="4dp" /> <solid android:color="@color/dark_secondary" /> </shape> </item> 

dark_scrollbar_fast_track.xml:

 <size android:width="@dimen/1dp" /> <solid android:color="@color/dark_scrollbar_track" /> 

A quick scrollbar is always visible, and I use the following style in my watchlists:

 <item name="android:scrollbarStyle">outsideInset</item> 

But the result is more like outsideOverlay. I can only observe this problem on Marshmallow devices.

I would like to find the attribute that calls it and change it from 48dp to 20dp. Could you help me?

Answer 1

I ran into the same problem and ended up using a workaround.

The trick is to turn off fast scrolling when the user is not scrolling (or 1 second after stopping scrolling), and reactivating it when he starts scrolling again. To do this, you need to implement OnScrollListener like this and set the listener to the list:

 private int mCurrentState = 0; @Override public void onScrollStateChanged(AbsListView absListView, int state) { if (state == SCROLL_STATE_IDLE && mCurrentState != state && mListview.isFastScrollEnabled()){ mListview.postDelayed(new Runnable() { @Override public void run() { mListview.setFastScrollEnabled(false); } },1000); } mCurrentState = state; } @Override public void onScroll(AbsListView absListView, int i, int i1, int i2) { if (mCurrentState == SCROLL_STATE_TOUCH_SCROLL) { if (!mListview.isFastScrollEnabled()) mListview.setFastScrollEnabled(true); } } 

Hope this helps you.

Answer 2

I found a simple solution, which, frankly, I do not understand completely;) I created a view overlay for the blue section, which should be touch-sensitive for the quick access panel (the parent view is RelativeLayout ).

 <View android:id="@+id/scroll_overlay android:layout_width="25dp" android:layout_marginRight="25dp" android:alignParentTop="true" android:alignParentRight="true" android:layout_above="@id/my_list_view_bottom_bar" android:clickable="true"/> 

Then, in my listview snippet, I configured OnTouchListener to display an overlay to catch touch events. The idea was to catch MotionEvent.ACTION_DOWN to avoid jumping to the fast scrollbar position. But the following code does it already.

 View scrollOverlay = (View)view.findViewById(R.id.scroll_overlay); scrollOverlay.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { return myListView.onTouchEvent(event); } });