使用GridLayoutManager的RecyclerView试图解决wrap_content

我尝试解决以下问题:

  • 使用RecyclerView
  • 与GridLayoutManager
  • 具有固定的细胞宽度
  • recyclerview仅调整到必要的高度(wrap_content)

我尝试使用下面的代码,问题是它不起作用,我还没有find任何工作示例没有提到方向更改时正确重绘。

public class AutofitRecyclerView extends RecyclerView { private MyGridLayoutManager manager; private int columnWidth = -1; public AutofitRecyclerView(Context context) { super(context); init(context, null); } public AutofitRecyclerView(Context context, AttributeSet attrs) { super(context, attrs); init(context, attrs); } public AutofitRecyclerView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(context, attrs); } private void init(Context context, AttributeSet attrs) { if (attrs != null) { int[] attrsArray = { android.R.attr.columnWidth }; TypedArray array = context.obtainStyledAttributes(attrs, attrsArray); columnWidth = array.getDimensionPixelSize(0, -1); array.recycle(); } manager = new MyGridLayoutManager(getContext(), 1); setLayoutManager(manager); } @Override protected void onMeasure(int widthSpec, int heightSpec) { super.onMeasure(widthSpec, heightSpec); if (columnWidth > 0) { int mw = getMeasuredWidth(); int spanCount = Math.max(1, mw / columnWidth); manager.setSpanCount(spanCount); } int numOfFullRows = manager.getItemCount() / manager.getSpanCount(); if(manager.getItemCount() % manager.getSpanCount() > 0) { numOfFullRows++; } if(getChildCount() > 0) { int h = 0; try { h = manager.getChildAt(0).getMeasuredHeight(); } catch (Exception e) { e.printStackTrace(); } if(h != 0) { getLayoutParams().height = numOfFullRows * h; } } } } 

Solutions Collecting From Web of "使用GridLayoutManager的RecyclerView试图解决wrap_content"

基于连接器发布的代码,我提出了以下解决scheme,支持不同的行/列大小(尽pipe我已经承认没有testing过),将项目装饰的大小考虑在内,并正确处理不同的测量模式。

这里是代码:

 import android.content.Context; import android.graphics.Rect; import android.support.v7.widget.GridLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.View; import android.view.ViewGroup; public class WrappableGridLayoutManager extends GridLayoutManager { public WrappableGridLayoutManager(Context context, int spanCount) { super(context, spanCount); } private int[] measuredSize = 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 spanWidth = 0; int spanHeight = 0; int viewWidth = 0; int viewHeight = 0; int spanCount = getSpanCount(); for (int i = 0; i < getItemCount(); i++) { measureScrapChild(recycler, i, View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED), measuredSize); if (i % spanCount == 0) { spanWidth = measuredSize[0]; spanHeight = measuredSize[1]; } else { if (getOrientation() == VERTICAL) { spanWidth += measuredSize[0]; spanHeight = Math.max(spanHeight, measuredSize[1]); } else { spanWidth = Math.max(spanWidth, measuredSize[0]); spanHeight += measuredSize[1]; } } if (i % spanCount == spanCount - 1 || i == getItemCount() - 1) { if (getOrientation() == VERTICAL) { viewWidth = Math.max(viewWidth, spanWidth); viewHeight += spanHeight; } else { viewWidth += spanWidth; viewHeight = Math.max(viewHeight, spanHeight); } } } int finalWidth; int finalHeight; switch (widthMode) { case View.MeasureSpec.EXACTLY: finalWidth = widthSize; break; case View.MeasureSpec.AT_MOST: finalWidth = Math.min(widthSize, viewWidth); break; case View.MeasureSpec.UNSPECIFIED: finalWidth = viewWidth; break; default: finalWidth = widthSize; break; } switch (heightMode) { case View.MeasureSpec.EXACTLY: finalHeight = heightSize; break; case View.MeasureSpec.AT_MOST: finalHeight = Math.min(heightSize, viewHeight); break; case View.MeasureSpec.UNSPECIFIED: finalHeight = viewHeight; break; default: finalHeight = heightSize; break; } setMeasuredDimension(finalWidth, finalHeight); } private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec, int heightSpec, int[] measuredDimension) { View view = null; try { view = recycler.getViewForPosition(position); } catch (Exception ex) { // try - catch is needed since support library version 24 } 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; Rect decoratorRect = new Rect(); calculateItemDecorationsForChild(view, decoratorRect); measuredDimension[0] += decoratorRect.left; measuredDimension[0] += decoratorRect.right; measuredDimension[1] += decoratorRect.top; measuredDimension[1] += decoratorRect.bottom; recycler.recycleView(view); } } } 

你需要添加一个自定义的GridlayoutManager。 检查这个https://gist.github.com/ArthurSav/5f80e19d9ba6d562fbd5

如果你设置下面的属性,那么所有的单元格将有固定的大小:recyclerView.setHasFixedSize(true);