Android dropdown slide Show and hide toolbar another implementation

About the introduction is not said, do not use nested sliding case, another implementation, of course, you can also use the design package under the Coordinatorlayout.behavior. More straightforward to add code directly:

Inheriting Recyclerview.onscrolllistener overrides the Onscrolled method, while defining two abstract methods for us to handle hiding and displaying events

 Public Abstract  class recyclerviewscrolllistener extends recyclerview. Onscrolllistener {    Private Static Final intScroll_distance = -;Private intTotalscrolldistance;Private BooleanIsshow =true;@Override     Public void onscrollstatechanged(Recyclerview Recyclerview,intNewState) {Super. onscrollstatechanged (Recyclerview, newstate); }@Override     Public void onscrolled(Recyclerview Recyclerview,intDxintDY) {Super. onscrolled (Recyclerview, DX, dy);intFirstvisableitem = ((Linearlayoutmanager) Recyclerview.getlayoutmanager ()). Findfirstvisibleitemposition ();//When the first item has an interface, no hidden, display actions are triggered        if(firstvisableitem==0){return; }if(Dy >0&& isshow) | | (Dy <0&&!isshow)) {totalscrolldistance + = dy; }if(Totalscrolldistance > Scroll_distance && isshow)            {Hide (); Isshow =false; Totalscrolldistance =0; }Else if(Totalscrolldistance <-scroll_distance &&!isshow)            {Show (); Isshow =true; Totalscrolldistance =0; }    } Public Abstract void Hide(); Public Abstract void Show();}

Hide and show event handling

 mRecyclerView.addOnScrollListener(new RecyclerViewScrollListener() {            @Override            publicvoidhide() {                mToolbar.animate().translationY(-mToolbar.getHeight()).setInterpolator(new AccelerateDecelerateInterpolator());            }            @Override            publicvoidshow() {                mToolbar.animate().translationY(0).setInterpolator(new AccelerateDecelerateInterpolator());            }        });

Effect:

XML layout:

<relativelayout  xmlns: Android  = "http://schemas.android.com/apk/res/android"  xmlns:tools  =" Http://schemas.android.com/tools " android:layout_width  = "match_parent"  android:layout_height  =" match_parent " tools:context  =". Mainactivity ";     <android.support.v7.widget.recyclerview  android:id  =" @+id/recyclerview " android:layout_width  =" match_parent " android:paddingtop  = android:cliptopadding  =" false " android:layout_height  = "match_parent" />     <android.support.v7.widget.Toolbarandroid:id="@+id/toolbar"android: Layout_width="Match_parent"android:background="#8803A9F4"android:layout_ Height="? actionbarsize" />                                </relativelayout>

One of the above Recyclerview useful to a property: android:clipToPadding , this property is not used much, here to illustrate the usage, this property meaning when we set the Paddingtop and other properties, to set the contents of the list can be drawn in the padding area, The default is true, which means that you cannot draw in the padding area, false indicates that you can draw in the padding area, as shown above, the list area would have been full screen, and I set the height of paddingtop to Actionbar, So the contents of the list will be under the Actionbar, when the upward sliding because I set android:clipToPadding="false" , so can be drawn in the padding area, below I if I set it to true, not aware of the android:clipToPadding="true" calendar, it must be above a padding blank area, to see the effect:

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Android dropdown slide Show and hide toolbar another implementation