RecyclerView和ScrollView嵌套使用

作者: ana生 | 来源:发表于2017-05-18 17:07 被阅读0次

在项目中我们经常碰到Recyclerview嵌套Scrollview，两者会产生滑动冲突，导致卡、滑动失效等现象。为此笔者总结了2种方法：

第一种.

recyclerview.setNestedScrollingEnabled(false);

第二种.

通过设置layoutmanager：

    idRvFmCourse.setLayoutManager();

1.LinearLayoutManager和ScrollView嵌套

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();  
    } finally {  
    }  
}  
}

2.GridLayoutManager和ScrollView进行嵌套

public class FullyGridLayoutManager extends GridLayoutManager {  
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];  

@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:  
    }  

    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();  
        }  
    }  
}  
}

3.StaggeredGridLayoutManager和ScrollView进行嵌套

public class ExStaggeredGridLayoutManager extends StaggeredGridLayoutManager {  

public ExStaggeredGridLayoutManager(int spanCount, int orientation) {  
    super(spanCount, orientation);  
}  

// 尺寸的数组，[0]是宽，[1]是高  
private int[] measuredDimension = new int[2];  

// 用来比较同行/列那个item罪宽/高  
private int[] dimension;  


@Override  

public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state, int widthSpec, int heightSpec) {  
    // 宽的mode+size  
    final int widthMode = View.MeasureSpec.getMode(widthSpec);  
    final int widthSize = View.MeasureSpec.getSize(widthSpec);  
    // 高的mode + size  
    final int heightMode = View.MeasureSpec.getMode(heightSpec);  
    final int heightSize = View.MeasureSpec.getSize(heightSpec);  

    // 自身宽高的初始值  
    int width = 0;  
    int height = 0;  
    // item的数目  
    int count = getItemCount();  
    // item的列数  
    int span = getSpanCount();  
    // 根据行数或列数来创建数组  
    dimension = new int[span];  

    for (int i = 0; i < count; i++) {  
        measureScrapChild(recycler, i,  
                View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),  
                View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED), measuredDimension);  

       // 如果是竖直的列表，计算item的高，否则计算宽度  
        //Log.d("LISTENER", "position " + i + " height = " + measuredDimension[1]);  
        if (getOrientation() == VERTICAL) {  
            dimension[findMinIndex(dimension)] += measuredDimension[1];  
        } else {  
            dimension[findMinIndex(dimension)] += measuredDimension[0];  
        }  
    }  
    if (getOrientation() == VERTICAL) {  
        height = findMax(dimension);  
    } else {  
        width = findMax(dimension);  
    }  
      

    switch (widthMode) {  
        // 当控件宽是match_parent时，宽度就是父控件的宽度  
        case View.MeasureSpec.EXACTLY:  
            width = widthSize;  
            break;  
        case View.MeasureSpec.AT_MOST:  
            break;  
        case View.MeasureSpec.UNSPECIFIED:  
            break;  
    }  
    switch (heightMode) {  
        // 当控件高是match_parent时，高度就是父控件的高度  
        case View.MeasureSpec.EXACTLY:  
            height = heightSize;  
            break;  
        case View.MeasureSpec.AT_MOST:  
            break;  
        case View.MeasureSpec.UNSPECIFIED:  
            break;  
    }  
    // 设置测量尺寸    
    setMeasuredDimension(width, height);  
}  

private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,  
        int heightSpec, int[] measuredDimension) {  

    // 挨个遍历所有item  
    if (position < getItemCount()) {  
        try {  
            View view = recycler.getViewForPosition(position);//fix 动态添加时报IndexOutOfBoundsException  

            if (view != null) {  
                RecyclerView.LayoutParams lp = (RecyclerView.LayoutParams) view.getLayoutParams();  
                int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec, getPaddingLeft() + getPaddingRight(), lp.width);  
                int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec, getPaddingTop() + getPaddingBottom(), lp.height);  
                // 子view进行测量，然后可以通过getMeasuredWidth()获得测量的宽，高类似  
                view.measure(childWidthSpec, childHeightSpec);  
                // 将item的宽高放入数组中  
                measuredDimension[0] = view.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;  
                measuredDimension[1] = view.getMeasuredHeight() + lp.topMargin + lp.bottomMargin;  
                recycler.recycleView(view);  
            }  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
}  

private int findMax(int[] array) {  
    int max = array[0];  
    for (int value : array) {  
        if (value > max) {  
            max = value;  
        }  
    }  
    return max;  
}  

/** 
 * 得到最数组中最小元素的下标 
 * 
 * @param array 
 * @return 
 */  
private int findMinIndex(int[] array) {  
    int index = 0;  
    int min = array[0];  
    for (int i = 0; i < array.length; i++) {  
        if (array[i] < min) {  
            min = array[i];  
            index = i;  
        }  
    }  
    return index;  
}   
}


/**
 * 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);
}
}

RecyclerView和ScrollView嵌套使用

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