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；\n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；\n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. \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);

        //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