package com.example.recycleview_jinjie;
//第一步

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;


import com.bumptech.glide.Glide;
import com.example.recycleview_jinjie.utils.Images;


import java.util.ArrayList;
import java.util.Random;


public class WaterWallActivity extends AppCompatActivity {


    private RecyclerView recyclerView;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_water_wall);
        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        //瀑布效果
        recyclerView.setLayoutManager(new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL));


        recyclerView.setAdapter(new MyAdapter());
    }


    class MyViewHoler extends RecyclerView.ViewHolder {


        public final ImageView iv_water_item;


        public MyViewHoler(View itemView) {
            super(itemView);

            iv_water_item = (ImageView) itemView.findViewById(R.id.iv_water_item);
        }
    }


    class MyAdapter extends RecyclerView.Adapter<MyViewHoler> {


        private final ArrayList<Integer> heightList;


        public MyAdapter() {
            heightList = new ArrayList<>();
            Random random = new Random();
            for (int i = 0; i < Images.imageUrls.length; i++) {
                int height = 100 + random.nextInt(300);
                heightList.add(height);
            }
        }


        @Override
        public MyViewHoler onCreateViewHolder(ViewGroup parent, int viewType) {
            View view = View.inflate(WaterWallActivity.this, R.layout.layout_waterwall, null);
            MyViewHoler myViewHoler = new MyViewHoler(view);
            return myViewHoler;
        }


        @Override
        public void onBindViewHolder(MyViewHoler holder, int position) {
            //獲取佈局引數
            ViewGroup.LayoutParams layoutParams = holder.iv_water_item.getLayoutParams();
            //重新設定高度
            layoutParams.height=heightList.get(position);

            Log.i("AAAA-----","-------"+heightList.get(position));
            //重新設定佈局引數
            holder.iv_water_item.setLayoutParams(layoutParams);
            holder.iv_water_item.setScaleType(ImageView.ScaleType.CENTER_CROP);
//            holder.iv_water_item.set

//            Glide.with(WaterWallActivity.this).load(Images.imageUrls[position]).into(holder.iv_water_item);

//            Glide.with(WaterWallActivity.this).load(Images.imageUrls[position]).placeholder(R.mipmap.ic_launcher).error(R.mipmap.ic_launcher).into(holder.iv_water_item);

          //載入網路圖片可以Gif格式

  Glide.with(WaterWallActivity.this).load(Images.imageUrls[position]).placeholder(R.mipmap.ic_launcher).error(R.mipmap.ic_launcher).into(holder.iv_water_item);

        }

        @Override
        public int getItemCount() {
            return Images.imageUrls.length;
        }
    }

}

//Glide 的工具類   

//第二步

package com.example.recycleview_jinjie.utils;

import android.content.Context;
import android.os.Environment;
import com.bumptech.glide.Glide;
import com.bumptech.glide.GlideBuilder;
import com.bumptech.glide.load.engine.cache.DiskLruCacheFactory;
import com.bumptech.glide.load.engine.cache.LruResourceCache;
import com.bumptech.glide.module.GlideModule;
import java.io.File;
/**

 * Created by xujiajian on 16/12/27.
 */
public class MyModule implements GlideModule {
    @Override
    public void applyOptions(Context context, GlideBuilder builder) {
        int maxMemory = (int) Runtime.getRuntime().maxMemory();//獲取系統分配給應用的總記憶體大小
        int memoryCacheSize = maxMemory / 8;//設定圖片記憶體快取佔用八分之一
        //設定記憶體快取大小
        builder.setMemoryCache(new LruResourceCache(memoryCacheSize));


        File cacheDir = Environment.getExternalStorageDirectory();//指定的是資料的快取地址
        int diskCacheSize = 1024 * 1024 * 30;//最多可以快取多少位元組的資料
        //設定磁碟快取大小
        builder.setDiskCache(new DiskLruCacheFactory(cacheDir.getPath(), "glide", diskCacheSize));
    }

    @Override
    public void registerComponents(Context context, Glide glide) {


    }
}

//配置需要

// 第三步

Build.gradle 新增許可權

compile 'com.android.support:recyclerview-v7:24.0.0-alpha2'
compile 'com.github.bumptech.glide:glide:3.7.0'

// 第四步

//許可權

<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>