recycleview瀑布流Item适应图片

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package com.example.pei.recyclerviewdemo;import android.app.Activity;import android.content.Context;import android.content.res.Resources;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.drawable.Drawable;import android.support.v7.widget.RecyclerView;import android.util.Log;import android.view.Display;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.Toast;/** * Created by */public class RVAdapter extends RecyclerView.Adapter<RVAdapter.ViewHolder>{    int a[] = {            R.mipmap.d,            R.mipmap.e,            R.mipmap.f,            R.mipmap.d,            R.mipmap.e,            R.mipmap.f,            R.mipmap.d,            R.mipmap.e,            R.mipmap.f            };    Context mContext;    public RVAdapter(Context context) {        mContext = context;    }    @Override    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view = LayoutInflater.from(mContext).inflate(R.layout.item_image,null);        ViewHolder viewHolder = new ViewHolder(view);        return viewHolder;    }    @Override    public void onBindViewHolder(ViewHolder holder, final int position) {        holder.mImageView.setImageResource(a[position]);        holder.mImageView.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Log.d("RVAdapter", "position:..." + position);            }        });        ViewGroup.LayoutParams params = holder.mImageView.getLayoutParams();        Bitmap bitmap = BitmapFactory.decodeResource(mContext.getResources(),a[position]);        int width = bitmap.getWidth();        int height = bitmap.getHeight();        //拿到屏幕宽        int screenWidth = ((Activity) holder.mImageView.getContext())                .getWindowManager().getDefaultDisplay().getWidth();        float aaa = (float)screenWidth/3;        //图片压缩比例        float bili = (float) (width/aaa);        params.height = (int) (height/bili);        params.width = (int) (width/bili);        holder.mImageView.setLayoutParams(params);    }    @Override    public int getItemCount() {        return a.length;    }    public class ViewHolder extends RecyclerView.ViewHolder {        private ImageView mImageView;        public ViewHolder(View itemView) {            super(itemView);            mImageView = (ImageView) itemView.findViewById(R.id.image_main);    }    }}

为了防止以瀑布流显示图片的时候,图片会有空白区域.

本来以为会出现特殊情况导致一列的图片超过其他列图片高度太多,后来发现不会发生,recycleview已经考虑到了这个.nice

item的position不会因为recycleview的自动排列而乱了数组中的位置

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