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