使用RecylerView实现瀑布流图片

ImageUtil

package com.qizu.zhoukaocar;/** * Created by WangChang on 2016/4/3. */public class ImageUtil {    public final static String[] imageUrls = new String[]{            "http://img.my.csdn.net/uploads/201508/05/1438760758_3497.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760758_6667.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760757_3588.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760756_3304.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760755_6715.jpeg",            "http://img.my.csdn.net/uploads/201508/05/1438760726_5120.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760726_8364.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760725_4031.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760724_9463.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760724_2371.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760707_4653.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760706_6864.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760706_9279.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760704_2341.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760704_5707.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760685_5091.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760685_4444.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760684_8827.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760683_3691.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760683_7315.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760663_7318.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760662_3454.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760662_5113.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760661_3305.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760661_7416.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760589_2946.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760589_1100.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760588_8297.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760587_2575.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760587_8906.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760550_2875.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760550_9517.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760549_7093.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760549_1352.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760548_2780.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760531_1776.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760531_1380.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760530_4944.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760530_5750.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760529_3289.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760500_7871.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760500_6063.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760499_6304.jpeg",            "http://img.my.csdn.net/uploads/201508/05/1438760499_5081.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760498_7007.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760478_3128.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760478_6766.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760477_1358.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760477_3540.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760476_1240.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760446_7993.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760446_3641.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760445_3283.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760444_8623.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760444_6822.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760422_2224.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760421_2824.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760420_2660.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760420_7188.jpg",            "http://img.my.csdn.net/uploads/201508/05/1438760419_4123.jpg",    };}

主方法

package com.qizu.zhoukaocar;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.RecyclerView;import android.support.v7.widget.StaggeredGridLayoutManager;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {    private RecyclerView recyclerView;    private List<String> mDatas;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initData();        initView();    }    private void initData() {        mDatas = new ArrayList<String>();        for (int i = 0 ; i < ImageUtil.imageUrls.length ; i++){            String data = ImageUtil.imageUrls[i];            mDatas.add(data);        }    }    private void initView() {        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);        //添加布局管理        StaggeredGridLayoutManager manager = new  StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL);        recyclerView.setLayoutManager(manager);        //设置适配器        recyclerView.setAdapter(new RecycleAdapter(this,mDatas));        //设置item添加和删除的动画//        recyclerView.setItemAnimator();        //设置分隔线//        recyclerView.addItemDecoration(new DividerGridItemDecoration(this));    }}
适配器

package com.qizu.zhoukaocar;import android.content.Context;import android.graphics.Bitmap;import android.support.v7.widget.RecyclerView;import android.util.SparseArray;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.LinearLayout;import com.bumptech.glide.Glide;import com.bumptech.glide.request.animation.GlideAnimation;import com.bumptech.glide.request.target.SimpleTarget;import com.bumptech.glide.request.target.Target;import java.util.List;/** * Created by jiuhao on 2017/11/18. * data 2017/11/18 * time 上午 10:30 */public class RecycleAdapter extends RecyclerView.Adapter<RecycleAdapter.MyViewHolder> {    private List<String> mDatas;    private Context context;    private LayoutInflater inflater;    private SparseArray<Integer> heightArray;    public RecycleAdapter(Context context , List<String> mDatas){        this.context = context;        this.mDatas = mDatas;        this.inflater = LayoutInflater.from(context);    }    @Override    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        heightArray = new SparseArray<Integer>();        View itemView = inflater.inflate(R.layout.item_recycle,parent,false);        MyViewHolder viewHolder = new MyViewHolder(itemView);        return viewHolder;    }    @Override    public void onBindViewHolder(final MyViewHolder holder, final int position) {        if (heightArray.get(position) == null){            Glide.with(context)                    .load(mDatas.get(position))                    .asBitmap()                    .placeholder(R.mipmap.ic_launcher)                    .into(new SimpleTarget<Bitmap>(Target.SIZE_ORIGINAL, Target.SIZE_ORIGINAL) {                        @Override                        public void onResourceReady(Bitmap bitmap, GlideAnimation glideAnimation) {                            // Do something with bitmap here.                            int height = bitmap.getHeight(); //获取bitmap信息，可赋值给外部变量操作，也可在此时行操作。                            bitmap.getWidth();                            LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) holder.iv.getLayoutParams();                            layoutParams.height = height;                            holder.iv.setLayoutParams(layoutParams);                            heightArray.put(position,height);                        }                    });        }else {            int height = heightArray.get(position);            LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) holder.iv.getLayoutParams();            layoutParams.height = height;            holder.iv.setLayoutParams(layoutParams);        }        Glide.with(context)                .load(mDatas.get(position))                .into(holder.iv);    }    @Override    public int getItemCount() {        return mDatas.size();    }    class MyViewHolder extends RecyclerView.ViewHolder{        ImageView iv;        public MyViewHolder(View itemView) {            super(itemView);            iv = (ImageView) itemView.findViewById(R.id.ivImage);        }    }}
逐步局

<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.qizu.zhoukaocar.MainActivity">    <android.support.v7.widget.RecyclerView        android:id="@+id/recyclerView"        android:layout_width="match_parent"        android:layout_height="match_parent">    </android.support.v7.widget.RecyclerView></android.support.constraint.ConstraintLayout>
item_recycle.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    xmlns:card_view="http://schemas.android.com/tools"    android:layout_height="match_parent"    android:background="#FFFFFF">        <ImageView            android:id="@+id/ivImage"            android:layout_width="match_parent"            android:layout_height="match_parent"            android:scaleType="centerCrop"            android:padding="4dp"/></LinearLayout>
dimens

<resources>    <!-- Default screen margins, per the Android Design guidelines. -->    <dimen name="activity_horizontal_margin">16dp</dimen>    <dimen name="activity_vertical_margin">16dp</dimen></resources>
依赖

compile 'com.android.support:recyclerview-v7:26.0.0-alpha1'compile 'com.github.bumptech.glide:glide:3.7.0'compile 'com.squareup.okhttp3:okhttp:3.9.0'compile 'com.squareup.okhttp3:logging-interceptor:3.9.0'compile 'com.jakewharton:butterknife-compiler:8.8.1'compile 'com.jakewharton:butterknife:8.8.1'compile 'com.android.support:palette-v7:26.0.0-alpha1'compile 'com.android.support:cardview-v7:26.0.0-alpha1'