1、RecyclerView跳转到指定位置

只需调用recycleview的置顶方法：

recyclerView.scrollToPosition(15);

如果你需要让第15item在屏幕居中，只需吧scrollToPosition参数变小即可:

如：

recyclerView.scrollToPosition(12);或

recyclerView.scrollToPosition(9);

即可让15item在屏幕居中

 

注：置顶显示item

mRecyclerView.smoothScrollToPosition(currentIndex);

 

RecyclerView.canScrollVertically(1)的值表示是否能向下滚动，false表示已经滚动到底部
RecyclerView.canScrollVertically(-1)的值表示是否能向上滚动，false表示已经滚动到顶部

 

 

2、RecyclerView上下滑动监听——上拉刷新列表
 

private int lastposion, pagenum = 1, pageContent, num;

gxwbrecyclerview.addOnScrollListener(new RecyclerView.OnScrollListener() {//用来标记是否正在向最后一个滑动，既是否向右滑动或向下滑动boolean isSlidingToLast = false;@Overridepublic void onScrollStateChanged(RecyclerView recyclerView, int newState) {LinearLayoutManager manager = (LinearLayoutManager) recyclerView.getLayoutManager();// 当不滚动时if (newState == RecyclerView.SCROLL_STATE_IDLE) {//获取最后一个完全显示的ItemPositionlastposion = manager.findLastCompletelyVisibleItemPosition();int totalItemCount = manager.getItemCount();if (lastposion == (totalItemCount - 1) && isSlidingToLast&&!ifload) {pagenum++;if (pagenum>pageContent){Toast.makeText(getContext(), "已到底！", Toast.LENGTH_SHORT).show();return;}getarealist(1);}}}@Overridepublic void onScrolled(RecyclerView recyclerView, int dx, int dy) {super.onScrolled(recyclerView, dx, dy);//dx用来判断横向滑动方向，dy用来判断纵向滑动方向//大于0表示，正在向右滚动；小于等于0 表示停止或向左滚动isSlidingToLast = dy > 0;}
});

 

 

void onScrollStateChanged(RecyclerView recyclerView, int newState): 滚动状态变化时回调
void onScrolled(RecyclerView recyclerView, int dx, int dy): 滚动时回调

/*** The RecyclerView is not currently scrolling.（静止没有滚动）*/
public static final int SCROLL_STATE_IDLE = 0;/*** The RecyclerView is currently being dragged by outside input such as user touch input.*（正在被外部拖拽,一般为用户正在用手指滚动）*/
public static final int SCROLL_STATE_DRAGGING = 1;/*** The RecyclerView is currently animating to a final position while not under outside control.*（自动滚动）*/
public static final int SCROLL_STATE_SETTLING = 2;

 

 

3、安卓手机7.0RecyclerView显示不全解决方法

解决办法是在RecyclerView的外部套上一层RelativeLayout

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:descendantFocusability="blocksDescendants">

        <android.support.v7.widget.RecyclerView
            android:id="@+id/menuRv"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/margin_16"
            android:layout_marginRight="@dimen/margin_16"/>

</RelativeLayout>

Android ScrollView与RecyclerView滑动冲突问题

解决滑动冲突、滑动不流畅
recyclerView.setHasFixedSize(true);
recyclerView.setNestedScrollingEnabled(false);

 

滑动速速设置

1、自定义类

public class LinearLayoutManagerWithScrollTop extends LinearLayoutManager {public LinearLayoutManagerWithScrollTop(Context context) {super(context);}public LinearLayoutManagerWithScrollTop(Context context, int orientation, boolean reverseLayout) {super(context, orientation, reverseLayout);}public LinearLayoutManagerWithScrollTop(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {super(context, attrs, defStyleAttr, defStyleRes);}@Overridepublic void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, int position) {TopSnappedSmoothScroller topSnappedSmoothScroller = new TopSnappedSmoothScroller(recyclerView.getContext());topSnappedSmoothScroller.setTargetPosition(position);startSmoothScroll(topSnappedSmoothScroller);}class TopSnappedSmoothScroller extends LinearSmoothScroller {public TopSnappedSmoothScroller(Context context) {super(context);}@Nullable@Overridepublic PointF computeScrollVectorForPosition(int targetPosition) {return LinearLayoutManagerWithScrollTop.this.computeScrollVectorForPosition(targetPosition);}/*** MILLISECONDS_PER_INCH 默认为25，及移动每英寸需要花费25ms，如果你要速度变快一点，就直接设置设置小一点，注意这里的单位是f*/protected float calculateSpeedPerPixel(DisplayMetrics displayMetrics) {return 15f / displayMetrics.densityDpi;}@Overrideprotected int getVerticalSnapPreference() {return SNAP_TO_START;}}
}

2、引用即可

mRecyclerView.setLayoutManager(new LinearLayoutManagerWithScrollTop(this));

 

不可滑动

//        LinearLayoutManager layoutManager = new LinearLayoutManager(this) {
//            public boolean canScrollVertically() {
//                return false;
//            }
//        };LinearLayoutManager layoutManager = new LinearLayoutManager(this);layoutManager.setOrientation(RecyclerView.VERTICAL);recyclerView.setLayoutManager(layoutManager);