Android开发中Scrollview嵌套recyclerview时,recyclerview不显示数据
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这个问题和ScrollView嵌套ListView是一个起因,是因为在scrollview嵌套的空间中无法正确计算recyclerview的高度造成的。
解决办法:重写recyclerview的布局管理器
1、重写LinearLayoutManager布局管理器
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、重写GridLayoutManager布局管理器
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); } @Override public int getItemCount() { return super.getItemCount(); } 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、重写StaggeredGridLayoutManager布局管理器
public class FullStaggeredGridLayoutManager extends StaggeredGridLayoutManager { public FullStaggeredGridLayoutManager(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; } }关于recyclerview的更多了解,可以去看点击打开链接
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