RecyclerView介绍（四）----实现瀑布流效果

瀑布流也是我们经常要实现的一个效果 通过RecyclerView实现瀑布流的效果也十分的简单，
具体代码如下实现：
Activity：

package demo.yangzc.com.recycledemo;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;

import java.util.ArrayList;
import java.util.List;

public class StaggeredDemoActivity extends AppCompatActivity {

    private RecyclerView mRecyclerView;
    private List<String> mDatas;
    private StaggeredAdapter mAdapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recycle_demo);


        initViews();
        initDatas();


    }

    private void initViews() {
        mRecyclerView = (RecyclerView) findViewById(R.id.recyclerview);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
    }

    private void initDatas() {
        mDatas = new ArrayList<String>();
        for (int i = 'A'; i <= 'z'; i++) {
            mDatas.add("" + (char) i);
        }
        mAdapter = new StaggeredAdapter(this, mDatas);
        mRecyclerView.setAdapter(mAdapter);
        //设置RecyclerView的布局管理
        // 1.上下文 2.放向 3.是否反向布局
        StaggeredGridLayoutManager linearLayoutManager = new StaggeredGridLayoutManager(5, StaggeredGridLayoutManager.VERTICAL);
        mRecyclerView.setLayoutManager(linearLayoutManager);
        //设置RecycView的Item间的分割线
//        mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST));

    }}

Adapter：

package demo.yangzc.com.recycledemo;

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.TextView;

import java.util.ArrayList;
import java.util.List;

/**
 * @author yangzc
 * @data 2015/12/1 20:36
 * @desc 瀑布流的Adapter
 */
public class StaggeredAdapter extends RecyclerView.Adapter<StaggeredMyViewHoder> {
    //用于每个item的布局
    private LayoutInflater mInflater;
    private Context mContext;
    private List<String> mDatas;
    //瀑布流控制高度
    private List<Integer> mHeights;

    @Override
    //创建ViewHoler
    public StaggeredMyViewHoder onCreateViewHolder(ViewGroup parent, int viewType) {
        //item布局
        View view = mInflater.inflate(R.layout.item_simple_textview, parent, false);
        //传入item布局
        StaggeredMyViewHoder staggeredMyViewHoder = new StaggeredMyViewHoder(view);
        return staggeredMyViewHoder;
    }

    @Override
    //绑定ViewHolder
    public void onBindViewHolder(StaggeredMyViewHoder holder, int position) {
        ViewGroup.LayoutParams layoutParams = holder.itemView.getLayoutParams();
        layoutParams.height = mHeights.get(position);
        holder.itemView.setLayoutParams(layoutParams);
        holder.textView.setText(mDatas.get(position));
    }


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

    public StaggeredAdapter(Context context, List<String> datas) {
        this.mContext = context;
        this.mDatas = datas;
        mInflater = LayoutInflater.from(context);
        mHeights = new ArrayList<Integer>();
        for (int i = 0;i<mDatas.size();i++){
                mHeights.add((int) (100+Math.random()*300));
        }
    }
}

class StaggeredMyViewHoder extends RecyclerView.ViewHolder {
    TextView textView;

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

        textView = (TextView) itemView.findViewById(R.id.id_tv);
    }
}

效果如图：

通过以上的介绍 基本上就能把我们常见的结果效果实现了 但是 我们发现 RecyclerView并没有点击效果以及OnItemClick的方法 这个我会在下一篇当中详细介绍