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RecyclerFullyManagerDemo【ScrollView里嵌套Recycleview的自适应高度功能】

前言

对于Recyclerview自己的LinearLayoutManager和GridLayoutManager，在版本23.2.0之后的library库中已经解决了自适应的问题；

关于RecyclerView 23.2.0新特性
这个版本给 LayoutManager API 添加了新的特性:自动测量（auto-measurement）！它允许 RecyclerView 根据内容控制高度。
这意味着我们可以实现之前无法实现的情景（比如给 RecyclerView 设置 WRAP_CONTENT 属性）
基于这个改变，请检查 item 视图在之前设置的属性(旧版的 RecyclerView 的 item 视图如果设置 MATCH_PARENT 属性，则会自动占满整个视图)

但是有个问题就是当列表项超过一个屏幕的时候，Recyclerview的高度就是起始位置到屏幕的底部的高度值。

Demo中的FullyGridLayoutManager、FullyLinearLayoutManager、MyStaggeredGridLayoutManager，是在Frank-Zhu/AndroidRecyclerViewDemo基础上进行了优化，解决了上面说到的问题。

效果图

LinearLayoutManager GridLayoutManager

FullyLinearLayoutManager FullyGridLayoutManager

代码分析

使用FullyGridLayoutManager、FullyLinearLayoutManager、MyStaggeredGridLayoutManager的话，需要注意以下两点：

1、布局文件中需要给RecyclerView添加一个父布局LinearLayout【绿色区域是ScrollView的写法，黄色区域是需要注意的】

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#F4F4F4">

    <!-- 设置区域：可滑动 -->
    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbarSize="2dp"
        android:scrollbarThumbVertical="@drawable/scrollbar"
        android:scrollbars="vertical"
        >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            >
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="对于系统自己的LinearLayoutManager和GridLayoutManager，在版本23.2.0之后的library库中已经解决了自适应的问题；
但是有个问题就是当列表项超过一个屏幕的时候，Recyclerview的高度就是起始位置到屏幕的底部的高度值。"
                android:layout_margin="8dp"/>

            <!-- 列表区域 -->
            <LinearLayout
                android:id="@+id/recycler_layout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">
                <!-- RecyclerView列表 -->
                <android.support.v7.widget.RecyclerView
                    android:id="@+id/recycler_view"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:cacheColorHint="#00000000"
                    android:divider="@null"
                    android:listSelector="#00000000"
                    android:scrollbars="none"
                    />
            </LinearLayout>

            <Button
                android:id="@+id/btn_add"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="添加一个item"
                android:layout_margin="8dp"/>
        </LinearLayout>
    </ScrollView>
</RelativeLayout>

2、在代码中需要执行LayoutManager的setRecyclerViewLayout()方法，将RecyclerView的父布局传值过去

使用步骤

一、项目组织结构图

注意事项：

1、导入类文件后需要change包名以及重新import R文件路径

2、 Values目录下的文件（strings.xml、dimens.xml、colors.xml等），如果项目中存在，则复制里面的内容，不要整个覆盖

二、导入步骤

（1）在build.gradle中引用recyclerview【版本号和appcompat保持一致】

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.why.project.recyclerfullymanagerdemo"
        minSdkVersion 16
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

    //RecyclerView
    compile "com.android.support:recyclerview-v7:27.1.1"
}

（2）在项目中实现Recyclerview基本数据展现

1、创建Bean类

package com.why.project.recyclerfullymanagerdemo.bean;

/**
 * Created by HaiyuKing
 * Used 列表项的bean类
 */

public class NewsBean {
    private String newsId;//id值
    private String newsTitle;//标题

    public String getNewsId() {
        return newsId;
    }

    public void setNewsId(String newsId) {
        this.newsId = newsId;
    }

    public String getNewsTitle() {
        return newsTitle;
    }

    public void setNewsTitle(String newsTitle) {
        this.newsTitle = newsTitle;
    }
}

NewsBean.java

2、创建Adapter以及item的布局文件【这个Demo中不需要后续修改】

package com.why.project.recyclerfullymanagerdemo.adapter;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.why.project.recyclerfullymanagerdemo.R;
import com.why.project.recyclerfullymanagerdemo.bean.NewsBean;

import java.util.ArrayList;

/**
 * Created by HaiyuKing
 * Used 列表适配器
 */

public class NewsAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{
    /**上下文*/
    private Context myContext;
    /**集合*/
    private ArrayList<NewsBean> listitemList;

    /**
     * 构造函数
     */
    public NewsAdapter(Context context, ArrayList<NewsBean> itemlist) {
        myContext = context;
        listitemList = itemlist;
    }

    /**
     * 获取总的条目数
     */
    @Override
    public int getItemCount() {
        return listitemList.size();
    }

    /**
     * 创建ViewHolder
     */
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(myContext).inflate(R.layout.news_list_item, parent, false);
        ItemViewHolder itemViewHolder = new ItemViewHolder(view);
        return itemViewHolder;
    }

    /**
     * 声明grid列表项ViewHolder*/
    static class ItemViewHolder extends RecyclerView.ViewHolder
    {
        public ItemViewHolder(View view)
        {
            super(view);

            listItemLayout = (LinearLayout) view.findViewById(R.id.listitem_layout);
            mChannelName = (TextView) view.findViewById(R.id.tv_channelName);
        }

        LinearLayout listItemLayout;
        TextView mChannelName;
    }

    /**
     * 将数据绑定至ViewHolder
     */
    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int index) {

        //判断属于列表项
        if(viewHolder instanceof ItemViewHolder){
            NewsBean newsBean = listitemList.get(index);
            final ItemViewHolder itemViewHold = ((ItemViewHolder)viewHolder);

            itemViewHold.mChannelName.setText(newsBean.getNewsTitle());

            //如果设置了回调，则设置点击事件
            if (mOnItemClickLitener != null)
            {
                itemViewHold.listItemLayout.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        int position = itemViewHold.getLayoutPosition();//在增加数据或者减少数据时候，position和index就不一样了
                        mOnItemClickLitener.onItemClick(itemViewHold.listItemLayout, position);
                    }
                });
                //长按事件
                itemViewHold.listItemLayout.setOnLongClickListener(new View.OnLongClickListener() {
                    @Override
                    public boolean onLongClick(View view) {
                        int position = itemViewHold.getLayoutPosition();//在增加数据或者减少数据时候，position和index就不一样了
                        mOnItemClickLitener.onItemLongClick(itemViewHold.listItemLayout, position);
                        return false;
                    }
                });
            }

        }
    }

    /**
     * 添加Item--用于动画的展现*/
    public void addItem(int position,NewsBean listitemBean) {
        listitemList.add(position,listitemBean);
        notifyItemInserted(position);
    }
    /**
     * 删除Item--用于动画的展现*/
    public void removeItem(int position) {
        listitemList.remove(position);
        notifyItemRemoved(position);
    }

    /*=====================添加OnItemClickListener回调================================*/
    public interface OnItemClickLitener
    {
        void onItemClick(View view, int position);
        void onItemLongClick(View view, int position);
    }

    private OnItemClickLitener mOnItemClickLitener;

    public void setOnItemClickLitener(OnItemClickLitener mOnItemClickLitener)
    {
        this.mOnItemClickLitener = mOnItemClickLitener;
    }
}

NewsAdapter.java

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/listitem_layout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:layout_margin="1dp"
    android:background="#ffffff">

    <TextView
        android:id="@+id/tv_channelName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="标题"
        android:textSize="18sp"
        android:padding="20dp"/>

</LinearLayout>

news_list_item.xml

3、在Activity布局文件中引用Recyclerview控件【因为该Demo演示的是ScrollView中嵌套RecyclerView，所以布局和普通的RecyclerView不太一样（RecyclerView的高度设置为wrap_content）】

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#F4F4F4">

    <!-- 设置区域：可滑动 -->
    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbarSize="2dp"
        android:scrollbarThumbVertical="@drawable/scrollbar"
        android:scrollbars="vertical"
        >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            >
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="对于系统自己的LinearLayoutManager和GridLayoutManager，在版本23.2.0之后的library库中已经解决了自适应的问题；
但是有个问题就是当列表项超过一个屏幕的时候，Recyclerview的高度就是起始位置到屏幕的底部的高度值。"
                android:layout_margin="8dp"/>

            <!-- 列表区域 -->
            <LinearLayout
                android:id="@+id/recycler_layout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">
                <!-- RecyclerView列表 -->
                <android.support.v7.widget.RecyclerView
                    android:id="@+id/recycler_view"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:cacheColorHint="#00000000"
                    android:divider="@null"
                    android:listSelector="#00000000"
                    android:scrollbars="none"
                    />
            </LinearLayout>

            <Button
                android:id="@+id/btn_add"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="添加一个item"
                android:layout_margin="8dp"/>
        </LinearLayout>
    </ScrollView>
</RelativeLayout>

4、在Activity类中初始化recyclerview数据

package com.why.project.recyclerfullymanagerdemo;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;

import com.why.project.recyclerfullymanagerdemo.adapter.NewsAdapter;
import com.why.project.recyclerfullymanagerdemo.bean.NewsBean;

import java.util.ArrayList;

/**
 * Created by HaiyuKing
 * Used
 */

public class LinearLayoutManagerActivity extends AppCompatActivity {

    private RecyclerView mRecyclerView;
    private ArrayList<NewsBean> mNewsBeanArrayList;
    private NewsAdapter mNewsAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recyclerview);
        initViews();
        initDatas();
        initEvents();

    }

    private void initViews() {
        mRecyclerView = findViewById(R.id.recycler_view);
    }

    private void initDatas() {
        //初始化集合
        mNewsBeanArrayList = new ArrayList<NewsBean>();
        for(int i=0; i<5;i++){
            NewsBean newsBean = new NewsBean();
            newsBean.setNewsId("123"+i);
            newsBean.setNewsTitle("标题"+i);

            mNewsBeanArrayList.add(newsBean);
        }

       //设置布局管理器
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        mRecyclerView.setLayoutManager(linearLayoutManager);

        //设置适配器
        if(mNewsAdapter == null){
            //设置适配器
            mNewsAdapter = new NewsAdapter(this, mNewsBeanArrayList);
            mRecyclerView.setAdapter(mNewsAdapter);
            //添加分割线
            //设置添加删除动画
            //调用ListView的setSelected(!ListView.isSelected())方法，这样就能及时刷新布局
            mRecyclerView.setSelected(true);
        }else{
            mNewsAdapter.notifyDataSetChanged();
        }
    }

    private void initEvents() {
        //列表适配器的点击监听事件
        mNewsAdapter.setOnItemClickLitener(new NewsAdapter.OnItemClickLitener() {
            @Override
            public void onItemClick(View view, int position) {

            }

            @Override
            public void onItemLongClick(View view, int position) {

            }
        });

        //添加一个item
        findViewById(R.id.btn_add).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                NewsBean newsBean = new NewsBean();
                newsBean.setNewsId("123"+20);
                newsBean.setNewsTitle("标题"+20);

                mNewsBeanArrayList.add(newsBean);

                mNewsAdapter.notifyDataSetChanged();
            }
        });
    }
}

（3）将manager包复制到项目中

package com.why.project.recyclerfullymanagerdemo.manager;

import android.content.Context;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;

/**
 * Author:    ZhuWenWu
 * Version    V1.0
 * Date:      2015/2/26  14:14.
 * Description:
 * Modification  History:
 * Date             Author                Version            Description
 * -----------------------------------------------------------------------------------
 * 2015/2/26        ZhuWenWu            1.0                    1.0
 * Why & What is modified:
 * 【在原有的基础上进行了优化】
 */
public class FullyGridLayoutManager extends GridLayoutManager {

    private static final String TAG = FullyGridLayoutManager.class.getSimpleName();

    private LinearLayout mRecyclerViewLayout;//实现固定recyclerview的父布局的高度值
    
    public FullyGridLayoutManager(Context context, int spanCount) {
        super(context, spanCount);
    }

    public FullyGridLayoutManager(Context context, int spanCount, int orientation, boolean reverseLayout) {
        super(context, spanCount, 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;
        int count = getItemCount();
        int span = getSpanCount();
        Log.d(TAG,"{onMeasure}count="+count+";span="+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),
                    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:
        }
        Log.w(TAG,"{onMeasure}width="+width+";height="+height);
        setMeasuredDimension(width, height);
        //实现固定recyclerview的父布局的高度值
        LinearLayout.LayoutParams parmas = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,height);
        mRecyclerViewLayout.setLayoutParams(parmas);
    }

    private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,
                                   int heightSpec, int[] measuredDimension) {
        Log.d(TAG,"{measureScrapChild}position="+position+";getItemCount()="+getItemCount());
        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);
                    Log.w(TAG,"{measureScrapChild}childWidthSpec="+childWidthSpec+";childHeightSpec="+childHeightSpec);
                    measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin;
                    measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin;
                    Log.w(TAG,"{measureScrapChild}measuredDimension[0]="+measuredDimension[0]+";measuredDimension[1]="+measuredDimension[1]);
                    recycler.recycleView(view);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    //实现固定recyclerview的父布局的高度值
    public LinearLayout getRecyclerViewLayout() {
        return mRecyclerViewLayout;
    }

    public void setRecyclerViewLayout(LinearLayout recyclerViewLayout) {
        mRecyclerViewLayout = recyclerViewLayout;
    }

    //实现禁止recyclerview滑动
    @Override
    public boolean canScrollVertically() {
        //Similarly you can customize "canScrollHorizontally()" for managing horizontal scroll
        return false && super.canScrollVertically();
    }
}

FullyGridLayoutManager.java

package com.why.project.recyclerfullymanagerdemo.manager;

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;
import android.widget.LinearLayout;

/**
 * @Created HaiyuKing
 * @Used  RecyclerView和ScrollView嵌套使用【在原有的基础上进行了优化】
 * http://www.cnblogs.com/tianzhijiexian/p/4469516.html
 */
public class FullyLinearLayoutManager extends LinearLayoutManager {
    private static final String TAG = FullyLinearLayoutManager.class.getSimpleName();

    private LinearLayout mRecyclerViewLayout;//实现固定recyclerview的父布局的高度值

    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. 
widthMode " + widthMode
                + " 
heightMode " + heightSpec
                + " 
widthSize " + widthSize
                + " 
heightSize " + heightSize
                + " 
getItemCount() " + 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);
        //实现固定recyclerview的父布局的高度值
        LinearLayout.LayoutParams parmas = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,height);
        mRecyclerViewLayout.setLayoutParams(parmas);
    }

    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 {
        }
    }

    //实现固定recyclerview的父布局的高度值
    public LinearLayout getRecyclerViewLayout() {
        return mRecyclerViewLayout;
    }

    public void setRecyclerViewLayout(LinearLayout recyclerViewLayout) {
        mRecyclerViewLayout = recyclerViewLayout;
    }

    //实现禁止recyclerview滑动
    @Override
    public boolean canScrollVertically() {
        //Similarly you can customize "canScrollHorizontally()" for managing horizontal scroll
        return false && super.canScrollVertically();
    }
}

FullyLinearLayoutManager.java

package com.why.project.recyclerfullymanagerdemo.manager;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.LinearLayout;

/**
 * @Created HaiyuKing
 * @Used  StaggeredGridLayoutManager自适应高度
 * http://blog.csdn.net/skyyywerq/article/details/50731134
 */
public class MyStaggeredGridLayoutManager extends StaggeredGridLayoutManager {
    private static final String TAG = MyStaggeredGridLayoutManager.class.getSimpleName();

    private LinearLayout mRecyclerViewLayout;//实现固定recyclerview的父布局的高度值

    public MyStaggeredGridLayoutManager(int spanCount, int orientation, Context mContext) {
        super(spanCount, orientation);  
        mHeightArray = new int[spanCount];  
        this.mContext = mContext;  
        for (int i = 0; i < spanCount; i++)  
            mHeightArray[i] = 0;  
    }  
  
    private int[] mMeasuredDimension = new int[2];  
    private int[] mHeightArray;  
    private Context mContext;
  
    @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 < span; i++)//防止多次调用onMeasure方法造成数据叠加  
            mHeightArray[i] = 0;  
  
        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)  
                calculatorStaggeredHeight(mMeasuredDimension[0]);  
            else  
                calculatorStaggeredHeight(mMeasuredDimension[1]);  
        }
        //获取屏幕高度和宽度
        WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);  
          
        if (getOrientation() == HORIZONTAL) {  
            width = sort(mHeightArray);  
            height = outMetrics.widthPixels;//获取屏幕高度  
        } else {  
            height = sort(mHeightArray);  
            width = outMetrics.heightPixels;//获取屏幕宽度  
        }  
        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);
        //实现固定recyclerview的父布局的高度值
        LinearLayout.LayoutParams parmas = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,height);
        mRecyclerViewLayout.setLayoutParams(parmas);
    }  
  
    /** 
     * 冒泡排序返回数组最大值 
     * 
     * @param unsorted 
     * @return 
     */  
    private int sort(int[] unsorted) {  
        for (int i = 0; i < unsorted.length; i++) {  
            for (int j = i; j < unsorted.length; j++) {  
                if (unsorted[i] < unsorted[j]) {  
                    int temp = unsorted[i];  
                    unsorted[i] = unsorted[j];  
                    unsorted[j] = temp;  
                }  
            }  
        }  
        return unsorted[0];  
    }  
  
    /** 
     * 将传入的item高度值赋给当前数组中最小的元素 
     * 
     * @param singleViewHeight 传入的item高度 
     */  
    private void calculatorStaggeredHeight(int singleViewHeight) {  
        int index = 0;  
        int minValue = mHeightArray[0];  
        for (int i = 1; i < mHeightArray.length; i++) {  
            if (minValue > mHeightArray[i]) {  
                minValue = mHeightArray[i];  
                index = i;  
            }  
        }  
        mHeightArray[index] += singleViewHeight;  
    }  
  
    private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,
                                   int heightSpec, int[] measuredDimension) {
        if (position < getItemCount()) {  
            try {  
                View view = recycler.getViewForPosition(position);//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;  
  
                    Log.v("p.height", p.height + "");
                    Log.v("measuredDimension[1]", measuredDimension[1] + "");
  
                    recycler.recycleView(view);  
                }  
            } catch (Exception e) {
                e.printStackTrace();  
            }  
        }  
    }

    //实现固定recyclerview的父布局的高度值
    public LinearLayout getRecyclerViewLayout() {
        return mRecyclerViewLayout;
    }

    public void setRecyclerViewLayout(LinearLayout recyclerViewLayout) {
        mRecyclerViewLayout = recyclerViewLayout;
    }

    //实现禁止recyclerview滑动
    @Override
    public boolean canScrollVertically() {
        //Similarly you can customize "canScrollHorizontally()" for managing horizontal scroll
        return false && super.canScrollVertically();
    }

}

MyStaggeredGridLayoutManager.java

三、使用方法

FullyGridLayoutManager、FullyLinearLayoutManager、MyStaggeredGridLayoutManager的使用方法，就是替换掉之前项目中使用设置布局管理器代码部分的GridLayoutManager、LinearLayoutManager、StaggeredGridLayoutManager。

比如使用FullyGridLayoutManager的话，就按照下面的进行替换：

混淆配置

无

参考资料

关于RecyclerView 的Item 自适应问题

网格布局的RecyclerView高度随Item自适应

RecyclerView和ScrollView嵌套使用

ScrollView里嵌套Recycleview使用StaggeredGridLayoutManager高度不正确的问题

Frank-Zhu/AndroidRecyclerViewDemo

项目demo下载地址

https://github.com/haiyuKing/RecyclerFullyManagerDemo

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原文地址：https://www.cnblogs.com/whycxb/p/9329217.html