页面有两个RecyclerView无法正常显示且镶嵌ScrollView滑动异常问题

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于 2017-12-08 14:05:30 发布

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本文介绍了一种解决两个RecyclerView嵌套在同一界面时滑动冲突的方法。通过自定义LayoutManager及使用NestedScrollView，确保了良好的用户体验。

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上篇文章解决了两个listview镶嵌ScrollView出现的滑动问题，后来换为RecyclerView后又出现了问题，页面同时存在两个RecyclerView的时候RecyclerView无法正常显示，外部镶嵌ScrollView也无法正常滑动。

好了我的解决方法如下：

首先，需要重写LayoutManager，重写类如下：

package cn.longmaster.hospital.doctor.ui.consult;

import android.content.Context;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;

/**
 * 上传图片页的自定义LayoutManager(为实现页面有两个RecyclerView能同时滑动)
 * <p>
 * Created by WangHaiKun on 2017/10/9.
 */
public class FullyLinearLayoutManager extends LinearLayoutManager {

    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);
        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activity中为l两个RecyclerView设置LayoutManager：

FullyLinearLayoutManager linearLayoutManager = new FullyLinearLayoutManager(this);

recyclerView1.setLayoutManager(linearLayoutManager)；

FullyLinearLayoutManager linearLayoutManagers = new FullyLinearLayoutManager(this);
recyclerView2.setLayoutManager(linearLayoutManagers);

最后把之前的ScrollView改为NestedScrollView：

布局文件如下：

<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@id/activity_upload_picture_pause_upload_data_view"
android:layout_marginBottom="55dp"
android:fillViewport="true">

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">

<android.support.v7.widget.RecyclerView
android:id="@+id/activity_upload_picture_upload_result_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:divider="@null"
android:scrollbars="none" />

<android.support.v7.widget.RecyclerView
android:id="@+id/activity_upload_picture_list_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@id/activity_upload_picture_view"
android:divider="@null"
android:scrollbars="none" />

</LinearLayout>
</android.support.v4.widget.NestedScrollView>