关于ScrollView嵌套RecyclerView时RecyclerView不显示的问题
16lz
2021-01-26
在新版本中需求变更导致布局需要变化,RecyclerView外需要一层ScrollView来处理滑动。发布前夕发现在API 23 & 24上RecyclerView显示不完整。
光速冷静下来,马上去stackoverflow翻了一下,有人说ScrollView加上 android:fillViewport="true"
,但是我加上并没有解决问题。后来在RecyclerView外面加了一层RelativeLayout,问题解决。如果你在API 23 & 24上也遇到这个问题,可以参考一下。
- import android.content.Context;
- import android.support.v7.widget.LinearLayoutManager;
- import android.support.v7.widget.RecyclerView;
- import android.util.Log;
- import android.view.View;
- import android.view.ViewGroup;
- /**
- * Created by k on 2016/8/13.
- */
- 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 {
- }
- }
- }
然后在代码里添加如下: [html] view plain copy
- FullyLinearLayoutManager linearLayoutManager = new FullyLinearLayoutManager(this);
- recyclerView.setNestedScrollingEnabled(false);
- //设置布局管理器
- recyclerView.setLayoutManager(linearLayoutManager);
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