我的布局如下
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior=".AppBarFlingBehavior">
<android.support.design.widget.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="300dp"
app:layout_scrollFlags="scroll|enterAlwaysCollapsed">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_collapseMode="parallax"
android:background="#ff99"/>
</android.support.design.widget.CollapsingToolbarLayout>
<TextView
android:layout_width="match_parent"
android:layout_height="200dp"
app:layout_scrollFlags="scroll|enterAlwaysCollapsed"
android:text="aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"/>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/rv_sample"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="android.support.design.widget.AppBarLayout$ScrollingViewBehavior"/>
</android.support.design.widget.CoordinatorLayout>
我的问题是，当我放下AppBarLayout时，内容正在向下滚动，突然，我又放起了RecyclerView，整个布局有点滞后，然后随着该掠过而向上滚动RecyclerView （向上）的方向，如您在此video中看到的那样。我已经从许多来源尝试了许多解决方案（自定义行为），但到目前为止还没有奏效。有什么办法可以解决我的问题，我被困了一个星期。非常感谢您花时间解决我的问题。赞赏。
答案 0 :(得分：1)
将您的recyclerview放在nestedScrollView内，并从recyclerview中删除 app：layout_behavior ，并为
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
<android.support.v7.widget.RecyclerView
android:id="@+id/rv_sample"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:nestedScrollingEnabled="false"/>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
应该工作正常！
答案 1 :(得分：0)
我找到了一种解决方案（向yangchong致谢：https://developpaper.com/coordinator-layout-sliding-jitter-problem/）：
AppBarBehavior：
/**
* <pre>
* @author yangchong
* blog : https://github.com/yangchong211
* time : 2019/03/13
* desc: Custom Behavior
* Revision: Solving Some Problems of AppbarLayout
* 1) Fast sliding appbarLayout will rebound
* 2) Fast sliding appbarLayout to fold state, immediately sliding down, there will be the problem of jitter.
* 3) Slide appbarLayout, unable to stop sliding by pressing it with your finger
*/
public class AppBarLayoutBehavior extends AppBarLayout.Behavior {
private static final String TAG = "AppbarLayoutBehavior";
private static final int TYPE_FLING = 1;
private boolean isFlinging;
private boolean shouldBlockNestedScroll;
public AppBarLayoutBehavior(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean onInterceptTouchEvent(CoordinatorLayout parent, AppBarLayout child, MotionEvent ev) {
LogUtil.d(TAG, "onInterceptTouchEvent:" + child.getTotalScrollRange());
shouldBlockNestedScroll = isFlinging;
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
// Stop fling when your finger touches the screen
stopAppbarLayoutFling(child);
break;
default:
break;
}
return super.onInterceptTouchEvent(parent, child, ev);
}
/**
* Reflect to get private flingRunnable attributes, considering the problem of variable name modification after support 28
* @return Field
* @throws NoSuchFieldException
*/
private Field getFlingRunnableField() throws NoSuchFieldException {
Class<?> superclass = this.getClass().getSuperclass();
try {
// Support design 27 and the following version
Class<?> headerBehaviorType = null;
if (superclass != null) {
headerBehaviorType = superclass.getSuperclass();
}
if (headerBehaviorType != null) {
return headerBehaviorType.getDeclaredField("mFlingRunnable");
}else {
return null;
}
} catch (NoSuchFieldException e) {
e.printStackTrace();
// Possibly 28 or more versions
Class<?> headerBehaviorType = superclass.getSuperclass().getSuperclass();
if (headerBehaviorType != null) {
return headerBehaviorType.getDeclaredField("flingRunnable");
} else {
return null;
}
}
}
/**
* Reflect to get private scroller attributes, considering the problem of variable name modification after support 28
* @return Field
* @throws NoSuchFieldException
*/
private Field getScrollerField() throws NoSuchFieldException {
Class<?> superclass = this.getClass().getSuperclass();
try {
// Support design 27 and the following version
Class<?> headerBehaviorType = null;
if (superclass != null) {
headerBehaviorType = superclass.getSuperclass();
}
if (headerBehaviorType != null) {
return headerBehaviorType.getDeclaredField("mScroller");
}else {
return null;
}
} catch (NoSuchFieldException e) {
e.printStackTrace();
// Possibly 28 or more versions
Class<?> headerBehaviorType = superclass.getSuperclass().getSuperclass();
if (headerBehaviorType != null) {
return headerBehaviorType.getDeclaredField("scroller");
}else {
return null;
}
}
}
/**
* Stop appbarLayout's fling event
* @param appBarLayout
*/
private void stopAppbarLayoutFling(AppBarLayout appBarLayout) {
// Get the flingRunnable variable in HeaderBehavior by reflection
try {
Field flingRunnableField = getFlingRunnableField();
Field scrollerField = getScrollerField();
if (flingRunnableField != null) {
flingRunnableField.setAccessible(true);
}
if (scrollerField != null) {
scrollerField.setAccessible(true);
}
Runnable flingRunnable = null;
if (flingRunnableField != null) {
flingRunnable = (Runnable) flingRunnableField.get(this);
}
OverScroller overScroller = (OverScroller) scrollerField.get(this);
if (flingRunnable != null) {
LogUtil.d (TAG,'Flying Runnable');
appBarLayout.removeCallbacks(flingRunnable);
flingRunnableField.set(this, null);
}
if (overScroller != null && !overScroller.isFinished()) {
overScroller.abortAnimation();
}
} catch (NoSuchFieldException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
@Override
public boolean onStartNestedScroll(CoordinatorLayout parent, AppBarLayout child,
View directTargetChild, View target,
int nestedScrollAxes, int type) {
LogUtil.d(TAG, "onStartNestedScroll");
stopAppbarLayoutFling(child);
return super.onStartNestedScroll(parent, child, directTargetChild, target,
nestedScrollAxes, type);
}
@Override
public void onNestedPreScroll(CoordinatorLayout coordinatorLayout,
AppBarLayout child, View target,
int dx, int dy, int[] consumed, int type) {
LogUtil.d(TAG, "onNestedPreScroll:" + child.getTotalScrollRange()
+ " ,dx:" + dx + " ,dy:" + dy + " ,type:" + type);
// When type returns to 1, it indicates that the current target is in a non-touch sliding.
// The bug is caused by the sliding of the NestedScrolling Child2 interface in Coordinator Layout when the AppBar is sliding
// The subclass has not ended its own fling
// So here we listen for non-touch sliding of subclasses, and then block the sliding event to 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) {
LogUtil.d(TAG, "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) {
LogUtil.d(TAG, "onStopNestedScroll");
super.onStopNestedScroll(coordinatorLayout, abl, target, type);
isFlinging = false;
shouldBlockNestedScroll = false;
}
private static class LogUtil{
static void d(String tag, String string){
Log.d(tag,string);
}
}
}