From 61bfee4e9e0f4cc648357d0121354080086d987c Mon Sep 17 00:00:00 2001 From: lorienzhang Date: Thu, 25 May 2017 13:15:57 +0800 Subject: [PATCH] when to top of listview, get velocity by reflect; when finger down, stop listview scrolling --- .../java/com/lorien/wl/view/MyListView.java | 20 +++-- .../java/com/lorien/wl/view/WLLayout.java | 87 +++++++++++++++++-- 2 files changed, 92 insertions(+), 15 deletions(-) diff --git a/src/main/java/com/lorien/wl/view/MyListView.java b/src/main/java/com/lorien/wl/view/MyListView.java index 0bd740b..fef1203 100644 --- a/src/main/java/com/lorien/wl/view/MyListView.java +++ b/src/main/java/com/lorien/wl/view/MyListView.java @@ -30,12 +30,18 @@ public MyListView(Context context, AttributeSet attrs, int defStyleAttr) { } public void flingY(int velocityY) { -// if (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP) { -// fling(velocityY); -// } else { -// -// } - mFlingRunnable.startFling(velocityY); + // 5.0 + if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { + fling(velocityY); + } + // 4.4 + else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { + mFlingRunnable.startFling(velocityY); + } + // 4.4 以下 + else { + // TODO + } } private class FlingRunnable implements Runnable { @@ -62,7 +68,7 @@ public void run() { int delta = y - mLastFlingY; if (!finish) { mLastFlingY = y; - // ListView自动滚动 + // ListView滚动一段距离 MyListView.this.scrollListBy(delta); post(this); } else { diff --git a/src/main/java/com/lorien/wl/view/WLLayout.java b/src/main/java/com/lorien/wl/view/WLLayout.java index 3738ae8..ea09d3a 100644 --- a/src/main/java/com/lorien/wl/view/WLLayout.java +++ b/src/main/java/com/lorien/wl/view/WLLayout.java @@ -1,8 +1,6 @@ package com.lorien.wl.view; import android.content.Context; -import android.os.Build; -import android.support.annotation.RequiresApi; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; @@ -12,10 +10,14 @@ import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.ListAdapter; +import android.widget.OverScroller; import android.widget.Scroller; import com.lorien.wl.R; +import java.lang.reflect.Field; +import java.lang.reflect.InvocationTargetException; +import java.lang.reflect.Method; import java.util.ArrayList; import java.util.List; @@ -164,6 +166,28 @@ public class WLLayout extends ViewGroup { * ListView的滚动监听 */ private AbsListView.OnScrollListener mListViewScrollLisenter; + /** + * ListView的滚动状态 + */ + private int mListViewScrollState; + /** + * 反射，强制停止ListView + */ + private static Method mFlingEndMethod = null; + private static Field mFlingRunnableField = null; + static{ + try { + mFlingRunnableField = AbsListView.class.getDeclaredField("mFlingRunnable"); + mFlingRunnableField.setAccessible(true); + mFlingEndMethod = mFlingRunnableField.getType().getDeclaredMethod("endFling"); + mFlingEndMethod.setAccessible(true); + } catch (Exception e) { + mFlingEndMethod = null; + mFlingRunnableField = null; + } + } + + private OverScroller mScrollerReflectd; public WLLayout(Context context) { this(context, null); @@ -181,8 +205,6 @@ public WLLayout(Context context, AttributeSet attrs, int defStyleAttr) { mMaximumVelocity = ViewConfiguration.get(context).getScaledMaximumFlingVelocity(); } - - @RequiresApi(api = Build.VERSION_CODES.KITKAT) @Override public boolean dispatchTouchEvent(MotionEvent ev) { if (!isEnabled() || mWebView == null || mListView == null) { @@ -226,6 +248,10 @@ public boolean dispatchTouchEvent(MotionEvent ev) { } // 清空WVHolder列表 mWVholderList.clear(); + + if (mListViewScrollState == AbsListView.OnScrollListener.SCROLL_STATE_FLING) { + stopListViewFling(mListView); + } return super.dispatchTouchEvent(ev); case MotionEvent.ACTION_MOVE: @@ -265,6 +291,22 @@ public boolean dispatchTouchEvent(MotionEvent ev) { return super.dispatchTouchEvent(ev); } + /** + * 反射方法，强制停止ListView滚动 + * @param list + */ + private void stopListViewFling(MyListView list) { + if (mFlingEndMethod != null) { + try { + mFlingEndMethod.invoke(mFlingRunnableField.get(list)); + } catch (IllegalAccessException e) { + e.printStackTrace(); + } catch (InvocationTargetException e) { + Log.d(TAG, "###method: stopListViewFling()###", new Throwable(e)); + } + } + } + /** * 手指抬起后，滑动webview和listview * @@ -314,7 +356,6 @@ private void movePos(int deltaY) { mListView.offsetTopAndBottom(distanceY); } - @Override protected void onFinishInflate() { super.onFinishInflate(); @@ -334,6 +375,24 @@ protected void onFinishInflate() { mListView.setOnScrollListener(mListViewScrollLisenter); } + private void reflectAbsListView() { + try { + Class absListViewCls = Class.forName("android.widget.AbsListView"); + Field mFlingRunnableField = absListViewCls.getDeclaredField("mFlingRunnable"); + mFlingRunnableField.setAccessible(true); + Object mFlingRunnable = mFlingRunnableField.get(mListView); + + + Class flingRunnableCls = Class.forName("android.widget.AbsListView$FlingRunnable"); + Field mScrollerFeild = flingRunnableCls.getDeclaredField("mScroller"); + mScrollerFeild.setAccessible(true); + mScrollerReflectd = (OverScroller) mScrollerFeild.get(mFlingRunnable); + } catch (Exception e) { + mScrollerReflectd = null; + Log.d(TAG, "###Exception Stack###", new Throwable(e)); + } + } + /** * 对WebView和ListView进行测量 * @@ -423,7 +482,7 @@ private int getListViewContentHeight() { */ private void onScrollCheckerFinish(int velocity) { if (mCurrentPos == POS_START) { - // KITKAT 4.4 + // 存在版本兼容问题 mListView.flingY(velocity); } if (mCurrentPos == POS_END) { @@ -469,7 +528,7 @@ private int getScrollVelocityY() { } /** - * Scroller控制器 + * Tracker */ class ScrollChecker implements Runnable { @@ -633,6 +692,7 @@ class ListViewScrollListener implements AbsListView.OnScrollListener { @Override public void onScrollStateChanged(AbsListView view, int scrollState) { mScrollState = scrollState; + mListViewScrollState = scrollState; if (scrollState == SCROLL_STATE_IDLE) { mPositionState = STATE_POS_NONE; } @@ -643,6 +703,12 @@ public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCoun if (mPositionState != STATE_POS_NONE) { return; } + + if (mScrollerReflectd == null) { + // 反射出AbsListView.FlingRunnable.OverScroller对象 + reflectAbsListView(); + } + // ListView有header view if (mIsListViewHasHeader) { if (firstVisibleItem == 1) { @@ -675,7 +741,12 @@ public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCoun } int initialVelocity = calcListViewTopVelocity(startTime, duration, mIsListViewHasHeader); startTime = 0; - Log.d(TAG, "### calcListViewTopVelocity(): " + initialVelocity); + Log.d(TAG, "### when to top of ListView, curVelocity: " + initialVelocity); + // 如果能够成功反射出来OverScroll，就是用反射出来的加速度 + if (mScrollerReflectd != null) { + initialVelocity = (int) mScrollerReflectd.getCurrVelocity(); + Log.d(TAG, "### when to top of ListView, curVelocity reflected: " + initialVelocity); + } if (Math.abs(initialVelocity) > mMinimumVelocity) { flingWL(initialVelocity); }