RecylerView 实现流布局StaggeredGridLayoutManager使用

流布局

第一步:添加依赖

 compile 'com.android.support:appcompat-v7:25.3.1'
 compile 'com.android.support:design:25.3.1'
 compile 'com.android.support:recyclerview-v7:25.3.1'
 compile 'com.android.support:cardview-v7:25.3.1'
 compile 'com.github.bumptech.glide:glide:3.7.0'

因为加载的是网络图片,所以采用的是Glide图片加载框架。

第二步:recylerview布局 (刷新需要添加SwipeRefreshLayout)

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.wangchang.testpalette.MainActivity">


    <android.support.v7.widget.RecyclerView
        android:id="@+id/recylerview"
        android:padding="4dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</RelativeLayout>

第三步:RecylerView初始化

 recyclerView = (RecyclerView) findViewById(R.id.recylerview);

 recyclerView.setHasFixedSize(true);
 recyclerView.setLayoutManager(new StaggeredGridLayoutManager(2,  StaggeredGridLayoutManager.VERTICAL));
        recyclerView.setAdapter(adapter = new DemoAdapter());
        adapter.replaceAll(getData());

Demo中:

  final StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(2,
                StaggeredGridLayoutManager.VERTICAL);
        mRecyclerView.setLayoutManager(layoutManager);
        mMeizhiListAdapter = new MeizhiListAdapter(getContext(), mMeizhiList);
        mRecyclerView.setAdapter(mMeizhiListAdapter);
        mRecyclerView.addOnScrollListener(getOnBottomListener(layoutManager));//滚动预先加载数据
        mMeizhiListAdapter.setOnMeizhiTouchListener(getOnMeizhiTouchListener());//点击事件

这里主要是 recyclerView.setLayoutManager(new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL)); 设置StaggeredGridLayoutManager布局管理器,参数分别是列数,方向。

第四步:适配器的实现



package com.hsy.utils.utilsdemo.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.ImageView;
import android.widget.TextView;

import com.hsy.utils.utilsdemo.R;
import com.hsy.utils.utilsdemo.module.home.Daily;
import com.hsy.utils.utilslibrary.utils.GlideUtils;

import java.util.List;


/**
 * Created by drakeet on 6/20/15.
 */
public class MeizhiListAdapter
        extends RecyclerView.Adapter<MeizhiListAdapter.ViewHolder> {

    public static final String TAG = "MeizhiListAdapter";

    private List<Daily> mList;
    private Context mContext;
    private OnMeizhiTouchListener mOnMeizhiTouchListener;


    public MeizhiListAdapter(Context context, List<Daily> meizhiList) {
        mList = meizhiList;
        mContext = context;
    }


    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int i) {
        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.item_meizhi, parent, false);
        return new ViewHolder(v);
    }


    @Override
    public void onBindViewHolder(final ViewHolder viewHolder, final int position) {
        Daily meizhi = mList.get(position);
        int limit = 48;
        String text = "";
        if (meizhi != null && meizhi.getTitle() != null) {
            text = meizhi.getTitle().length() > limit ? meizhi.getTitle().substring(0, limit) +
                    "..." : meizhi.getTitle();
        }
        viewHolder.meizhi = meizhi;
        viewHolder.titleView.setText(text);
        viewHolder.card.setTag(meizhi.getDesc());

//加载图片
        GlideUtils.displayImage(mContext, meizhi.getImgUrl(), viewHolder.meizhiView);

    }


    @Override
    public void onViewRecycled(ViewHolder holder) {
        super.onViewRecycled(holder);
    }


    @Override
    public int getItemCount() {
        return mList != null ? mList.size() : 0;
    }


    public void setOnMeizhiTouchListener(OnMeizhiTouchListener onMeizhiTouchListener) {
        this.mOnMeizhiTouchListener = onMeizhiTouchListener;
    }


    class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

        ImageView meizhiView;
        TextView titleView;
        View card;
        Daily meizhi;


        public ViewHolder(View itemView) {
            super(itemView);
            card = itemView;
            meizhiView = (ImageView) itemView.findViewById(R.id.meizhi);
            titleView = (TextView) itemView.findViewById(R.id.title);
            meizhiView.setOnClickListener(this);
            card.setOnClickListener(this);
            itemView.setOnClickListener(this);
        }


        @Override
        public void onClick(View v) {
            mOnMeizhiTouchListener.onTouch(v, meizhiView, card, meizhi);
        }
    }
}

每个布局的样式item_layout

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="5dp"
    android:layout_marginRight="5dp"
    android:layout_marginTop="5dp">


    <LinearLayout
        android:id="@+id/meizhi_card"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:clickable="true"
        android:orientation="vertical">
        <!-- android:background="@drawable/bg_card"-->
        <ImageView
            android:id="@+id/meizhi"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:adjustViewBounds="true"
            android:scaleType="fitXY" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?attr/selectableItemBackground"
            android:orientation="horizontal"
            android:paddingBottom="10dp"
            android:paddingLeft="10dp"
            android:paddingRight="10dp"
            android:paddingTop="10dp">

            <TextView
                android:id="@+id/title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textAppearance="?android:attr/textAppearanceSmall"
                tools:text="Title" />

        </LinearLayout>

    </LinearLayout>
</android.support.v7.widget.CardView>

下面来说实现动态设置图片大小方式

ivImage.getContext()).getWindowManager().getDefaultDisplay().getWidth();
            ViewGroup.LayoutParams params = ivImage.getLayoutParams();
            //设置图片的相对于屏幕的宽高比
            params.width = width/3;
            params.height =  (int) (200 + Math.random() * 400) ;
            ivImage.setLayoutParams(params);

这里是获取屏幕宽度,因为是三列,所以设置图片宽度取屏幕三分之一。

demo源码:参考UtilsDemo中的消息
https://github.com/huangshuyuan/UtilsDemo

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