（转载） Scrollview 嵌套 RecyclerView 及在Android 5.1版本滑动时惯性消失问题 _recyclerview

千金一刻莫空度，老大无成空自伤。这篇文章主要讲述（转载） Scrollview 嵌套 RecyclerView 及在Android 5.1版本滑动时惯性消失问题相关的知识，希望能为你提供帮助。
Scrollview 嵌套 RecyclerView 及在Android 5.1版本滑动时惯性消失问题标签： scrollviewandroid滑动嵌套 2015-07-16 17:24 11126人阅读评论(17) 收藏举报

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分类： android进阶（19）（转载） Scrollview 嵌套 RecyclerView 及在Android 5.1版本滑动时惯性消失问题

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版权声明：本文为博主原创文章，未经博主允许不得转载。
【（转载） Scrollview 嵌套 RecyclerView 及在Android 5.1版本滑动时惯性消失问题】scrollview 嵌套recyclerview 时，recyclerview不显示，这就需要我们自己计算recyclerview的高度，比如：

ViewGroup.LayoutParams mParams = recyclerView.getLayoutParams(); mParams.height = (CommonUtils.getScreenWidthPX(getActivity()) * 480 / 720 + CommonUtils.dipToPixels(40)) * num + CommonUtils.dipToPixels(8); mParams.width = CommonUtils.getScreenWidthPX(getActivity()); recyclerView.setLayoutParams(mParams);

这中方法适合item高度比较好计算的情形，但要遇到里面的item高度不一定这就需要我们重写recyclerview的高度了，以前嵌套listview的时候我们只需重写listview 然后重写

@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // TODO Auto-generated method stub int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE > > 2, MeasureSpec.AT_MOST); super.onMeasure(widthMeasureSpec, expandSpec); }

但是这种方法在recyclerview重写不管用。
我们此时要重写的的是LinearLayoutManager或GridLayoutManager

public class FullyLinearLayoutManager extends LinearLayoutManager {private static final String TAG = FullyLinearLayoutManager.class.getSimpleName(); public FullyLinearLayoutManager(Context context) { super(context); }public FullyLinearLayoutManager(Context context, int orientation, boolean reverseLayout) { super(context, orientation, reverseLayout); }private int[] mMeasuredDimension = new int[2]; @Override public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state, int widthSpec, int heightSpec) {final int widthMode = View.MeasureSpec.getMode(widthSpec); final int heightMode = View.MeasureSpec.getMode(heightSpec); final int widthSize = View.MeasureSpec.getSize(widthSpec); final int heightSize = View.MeasureSpec.getSize(heightSpec); Log.i(TAG, "onMeasure called. \nwidthMode " + widthMode + " \nheightMode " + heightSpec + " \nwidthSize " + widthSize + " \nheightSize " + heightSize + " \ngetItemCount() " + getItemCount()); int width = 0; int height = 0; for (int i = 0; i < getItemCount(); i++) { measureScrapChild(recycler, i, View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED), mMeasuredDimension); if (getOrientation() == HORIZONTAL) { width = width + mMeasuredDimension[0]; if (i == 0) { height = mMeasuredDimension[1]; } } else { height = height + mMeasuredDimension[1]; if (i == 0) { width = mMeasuredDimension[0]; } } } switch (widthMode) { case View.MeasureSpec.EXACTLY: width = widthSize; case View.MeasureSpec.AT_MOST: case View.MeasureSpec.UNSPECIFIED: }switch (heightMode) { case View.MeasureSpec.EXACTLY: height = heightSize; case View.MeasureSpec.AT_MOST: case View.MeasureSpec.UNSPECIFIED: }setMeasuredDimension(width, height); }private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec, int heightSpec, int[] measuredDimension) { try { View view = recycler.getViewForPosition(0); //fix 动态添加时报IndexOutOfBoundsExceptionif (view != null) { RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams(); int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec, getPaddingLeft() + getPaddingRight(), p.width); int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec, getPaddingTop() + getPaddingBottom(), p.height); view.measure(childWidthSpec, childHeightSpec); measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin; measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin; recycler.recycleView(view); } } catch (Exception e) { e.printStackTrace(); } finally { } } }

=======

public class FullyGridLayoutManager extends GridLayoutManager {private int mwidth = 0; private int mheight = 0; public FullyGridLayoutManager(Context context, int spanCount) { super(context, spanCount); }public FullyGridLayoutManager(Context context, int spanCount, int orientation, boolean reverseLayout) { super(context, spanCount, orientation, reverseLayout); }private int[] mMeasuredDimension = new int[2]; public int getMwidth() { return mwidth; }public void setMwidth(int mwidth) { this.mwidth = mwidth; }public int getMheight() { return mheight; }public void setMheight(int mheight) { this.mheight = mheight; }@Override public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state, int widthSpec, int heightSpec) { final int widthMode = View.MeasureSpec.getMode(widthSpec); final int heightMode = View.MeasureSpec.getMode(heightSpec); final int widthSize = View.MeasureSpec.getSize(widthSpec); final int heightSize = View.MeasureSpec.getSize(heightSpec); int width = 0; int height = 0; int count = getItemCount(); int span = getSpanCount(); for (int i = 0; i < count; i++) { measureScrapChild(recycler, i, View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED), mMeasuredDimension); if (getOrientation() == HORIZONTAL) { if (i % span == 0) { width = width + mMeasuredDimension[0]; } if (i == 0) { height = mMeasuredDimension[1]; } } else { if (i % span == 0) { height = height + mMeasuredDimension[1]; } if (i == 0) { width = mMeasuredDimension[0]; } } }switch (widthMode) { case View.MeasureSpec.EXACTLY: width = widthSize; case View.MeasureSpec.AT_MOST: case View.MeasureSpec.UNSPECIFIED: }switch (heightMode) { case View.MeasureSpec.EXACTLY: height = heightSize; case View.MeasureSpec.AT_MOST: case View.MeasureSpec.UNSPECIFIED: } setMheight(height); setMwidth(width); setMeasuredDimension(width, height); }private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec, int heightSpec, int[] measuredDimension) { if (position < getItemCount()) { try { View view = recycler.getViewForPosition(0); //fix 动态添加时报IndexOutOfBoundsException if (view != null) { RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams(); int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec, getPaddingLeft() + getPaddingRight(), p.width); int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec, getPaddingTop() + getPaddingBottom(), p.height); view.measure(childWidthSpec, childHeightSpec); measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin; measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin; recycler.recycleView(view); } } catch (Exception e) { e.printStackTrace(); } } } }

重写完之后，用就好说了，在adapter的onBindview和平常一样用就可以了

final FullyGridLayoutManager manager = new FullyGridLayoutManager(context.getActivity(), 3); manager.setOrientation(GridLayoutManager.VERTICAL); manager.setSmoothScrollbarEnabled(true); viewHolder.recyclerView.setLayoutManager(manager);

此种方法在4.x系统上好用，能显示滑动也流畅，但是在5.x上虽然显示正常，但是滑动的时候好像被粘住了，没有惯性效果。。。。然后郁闷了一下午。。。。
最后解决方法是重写最外层的Scrollview

** * 屏蔽滑动事件 * Created by fc on 2015/7/16. */ public class MyScrollview extends ScrollView { private int downX; private int downY; private int mTouchSlop; public MyScrollview(Context context) { super(context); mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); }public MyScrollview(Context context, AttributeSet attrs) { super(context, attrs); mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); }public MyScrollview(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); }@Override public boolean onInterceptTouchEvent(MotionEvent e) { int action = e.getAction(); switch (action) { case MotionEvent.ACTION_DOWN: downX = (int) e.getRawX(); downY = (int) e.getRawY(); break; case MotionEvent.ACTION_MOVE: int moveY = (int) e.getRawY(); if (Math.abs(moveY - downY) > mTouchSlop) { return true; } } return super.onInterceptTouchEvent(e); } }