Android使用CoordinatorLayout与AppBarLayout时快速滑动回弹问题

在使用CoordinatorLayout时，套用AppBarLayout，实现滑动效果如果快速滑动，顶部就会出现回弹问题。

解决方法：重写

AppBarLayout.Behavior

代码如下：

1.

public class TestBehavior extends AppBarLayout.Behavior {

    private static final int TYPE_FLING = 1;

    private boolean isFlinging;
    private boolean shouldBlockNestedScroll;

    public TestBehavior() {
    }

    public TestBehavior(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onInterceptTouchEvent(CoordinatorLayout parent, AppBarLayout child, MotionEvent ev) {
        Log.i("TestBehavior", "onInterceptTouchEvent:" + child.getTotalScrollRange());
        shouldBlockNestedScroll = false;
        if (isFlinging) {
            shouldBlockNestedScroll = true;
        }
        return super.onInterceptTouchEvent(parent, child, ev);
    }

    @Override
    public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, View target, int dx, int dy, int[] consumed, int type) {
        //注意看ViewCompat.TYPE_TOUCH
        Log.i("TestBehavior", "onNestedPreScroll:" + child.getTotalScrollRange() + " ,dx:" + dx + " ,dy:" + dy + " ,type:" + type);

        //返回1时，表示当前target处于非touch的滑动，
        //该bug的引起是因为appbar在滑动时，CoordinatorLayout内的实现NestedScrollingChild2接口的滑动子类还未结束其自身的fling
        //所以这里监听子类的非touch时的滑动，然后block掉滑动事件传递给AppBarLayout
        if (type == TYPE_FLING) {
            isFlinging = true;
        }
        if (!shouldBlockNestedScroll) {
            super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed, type);
        }
    }

    @Override
    public void onNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, View target, int dxConsumed, int dyConsumed, int
            dxUnconsumed, int dyUnconsumed, int type) {
        Log.i("TestBehavior", "onNestedScroll: target:" + target.getClass() + " ," + child.getTotalScrollRange() + " ,dxConsumed:"
                + dxConsumed + " ,dyConsumed:" + dyConsumed + " " + ",type:" + type);
        if (!shouldBlockNestedScroll) {
            super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, type);
        }
    }

    @Override
    public void onStopNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout abl, View target, int type) {
        super.onStopNestedScroll(coordinatorLayout, abl, target, type);
        isFlinging = false;
        shouldBlockNestedScroll = false;
    }

2.在XML文件中使用

    android:id="@+id/cl"
    android:layout_width="match_parent"
    android:layout_height="350dp"
    android:background="@android:color/white"
    android:fitsSystemWindows="true"
    android:orientation="vertical"
    app:layout_behavior="com.example.zjlmdemo.TestBehavior">

详情请参照http://blog.csdn.net/vite_s/article/details/78901767