package com.lqr.materialdesigndemo.behavior; import android.content.Context; import android.support.design.widget.CoordinatorLayout; import android.support.v4.view.ViewCompat; import android.support.v4.widget.NestedScrollView; import android.util.AttributeSet; import android.view.View; public class CustomerBehavior2 extends CoordinatorLayout.Behavior<View> { public CustomerBehavior2(Context context, AttributeSet attrs) { super(context, attrs); } /** * 开始滚动前 */ @Override public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, View child, View target, int dx, int dy, int[] consumed) { int scrollY = target.getScrollY(); child.setScrollY(scrollY); super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed); } /** * 开始滚动时 */ @Override public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, View child, View directTargetChild, View target, int nestedScrollAxes) { // 监听竖直滚动 return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL || super.onStartNestedScroll(coordinatorLayout, child, directTargetChild, target, nestedScrollAxes); } /** * 开始滚动后 */ @Override public void onNestedScroll(CoordinatorLayout coordinatorLayout, View child, View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) { super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed); } /** * 松开手指后惯性滑动之前 */ @Override public boolean onNestedPreFling(CoordinatorLayout coordinatorLayout, View child, View target, float velocityX, float velocityY) { return super.onNestedPreFling(coordinatorLayout, child, target, velocityX, velocityY); } /** * 松开手指后惯性滑动时 */ @Override public boolean onNestedFling(CoordinatorLayout coordinatorLayout, View child, View target, float velocityX, float velocityY, boolean consumed) { ((NestedScrollView) child).fling((int) velocityY); return super.onNestedFling(coordinatorLayout, child, target, velocityX, velocityY, consumed); } int count = 1; /** * 滚动结束 */ @Override public void onStopNestedScroll(CoordinatorLayout coordinatorLayout, View child, View target) { child.animate().rotation(count++ * 360); super.onStopNestedScroll(coordinatorLayout, child, target); } }