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‎NestedScrollWebView.gif‎

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‎NestedScrollWebView.java‎

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package com.hjq.md.widget;
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import android.annotation.SuppressLint;
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import android.content.Context;
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import android.os.Build;
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import android.support.annotation.RequiresApi;
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import android.support.v4.view.NestedScrollingChild;
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import android.support.v4.view.NestedScrollingChildHelper;
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import android.support.v4.view.ViewCompat;
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import android.util.AttributeSet;
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import android.view.MotionEvent;
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import android.webkit.WebView;
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/**
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* NestedScrollWebView
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*/
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public class NestedScrollWebView extends WebView implements NestedScrollingChild {
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private NestedScrollingChildHelper mChildHelper;
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private int mLastMotionY;
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private final int[] mScrollOffset = new int[2];
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private final int[] mScrollConsumed = new int[2];
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private int mNestedYOffset;
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private boolean mChange;
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public NestedScrollWebView(Context context) {
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super(context);
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init();
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}
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public NestedScrollWebView(Context context, AttributeSet attrs) {
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super(context, attrs);
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init();
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}
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public NestedScrollWebView(Context context, AttributeSet attrs, int defStyleAttr) {
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super(context, attrs, defStyleAttr);
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init();
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}
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@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
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public NestedScrollWebView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
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super(context, attrs, defStyleAttr, defStyleRes);
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init();
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}
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public NestedScrollWebView(Context context, AttributeSet attrs, int defStyleAttr, boolean privateBrowsing) {
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super(context, attrs, defStyleAttr, privateBrowsing);
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init();
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}
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private void init() {
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if (mChildHelper == null) {
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mChildHelper = new NestedScrollingChildHelper(this);
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setNestedScrollingEnabled(true);
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}
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}
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@SuppressLint("ClickableViewAccessibility")
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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boolean result = false;
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MotionEvent trackedEvent = MotionEvent.obtain(event);
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final int action = event.getActionMasked();
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if (action == MotionEvent.ACTION_DOWN) {
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mNestedYOffset = 0;
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}
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int y = (int) event.getY();
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event.offsetLocation(0, mNestedYOffset);
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switch (action) {
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case MotionEvent.ACTION_DOWN:
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mChange = false;
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mLastMotionY = y;
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startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL);
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result = super.onTouchEvent(event);
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break;
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case MotionEvent.ACTION_MOVE:
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int deltaY = mLastMotionY - y;
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if (dispatchNestedPreScroll(0, deltaY, mScrollConsumed, mScrollOffset)) {
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deltaY -= mScrollConsumed[1];
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trackedEvent.offsetLocation(0, mScrollOffset[1]);
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mNestedYOffset += mScrollOffset[1];
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}
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mLastMotionY = y - mScrollOffset[1];
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int oldY = getScrollY();
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int newScrollY = Math.max(0, oldY + deltaY);
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int dyConsumed = newScrollY - oldY;
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int dyUnconsumed = deltaY - dyConsumed;
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if (dispatchNestedScroll(0, dyConsumed, 0, dyUnconsumed, mScrollOffset)) {
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mLastMotionY -= mScrollOffset[1];
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trackedEvent.offsetLocation(0, mScrollOffset[1]);
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mNestedYOffset += mScrollOffset[1];
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}
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if(mScrollConsumed[1]==0 && mScrollOffset[1]==0) {
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if(mChange){
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mChange =false;
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trackedEvent.setAction(MotionEvent.ACTION_DOWN);
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super.onTouchEvent(trackedEvent);
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}else {
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result = super.onTouchEvent(trackedEvent);
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}
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trackedEvent.recycle();
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}else{
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if(!mChange){
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mChange = true;
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super.onTouchEvent(MotionEvent.obtain(0,0,MotionEvent.ACTION_CANCEL,0,0,0));
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}
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}
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//result = super.onTouchEvent(trackedEvent);
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//trackedEvent.recycle();
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break;
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case MotionEvent.ACTION_POINTER_DOWN:
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case MotionEvent.ACTION_UP:
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case MotionEvent.ACTION_CANCEL:
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stopNestedScroll();
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result = super.onTouchEvent(event);
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break;
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}
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return result;
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}
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// NestedScrollingChild
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@Override
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public void setNestedScrollingEnabled(boolean enabled) {
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mChildHelper.setNestedScrollingEnabled(enabled);
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}
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@Override
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public boolean isNestedScrollingEnabled() {
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return mChildHelper.isNestedScrollingEnabled();
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}
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@Override
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public boolean startNestedScroll(int axes) {
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return mChildHelper.startNestedScroll(axes);
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}
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@Override
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public void stopNestedScroll() {
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mChildHelper.stopNestedScroll();
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}
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@Override
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public boolean hasNestedScrollingParent() {
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return mChildHelper.hasNestedScrollingParent();
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}
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@Override
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public boolean dispatchNestedScroll(int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed, int[] offsetInWindow) {
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return mChildHelper.dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, offsetInWindow);
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}
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@Override
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public boolean dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow) {
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return mChildHelper.dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow);
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}
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@Override
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public boolean dispatchNestedFling(float velocityX, float velocityY, boolean consumed) {
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return mChildHelper.dispatchNestedFling(velocityX, velocityY, consumed);
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}
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@Override
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public boolean dispatchNestedPreFling(float velocityX, float velocityY) {
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return mChildHelper.dispatchNestedPreFling(velocityX, velocityY);
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}
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}

‎README.md‎

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# 支持嵌套滚动的WebView
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![](NestedScrollWebView.gif)
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> [点击此处下载Demo]([最新安装包下载地址](https://raw.githubusercontent.com/getActivity/Markdown/master/app.apk))
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> 最新日志：解决ToolBar滚动的过快的Bug
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## License
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```text
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Copyright 2018 Huang Jinqun
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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```

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