Recyclerviews的使用（瀑布流）

1.导入依赖
compile ‘com.android.support:recyclerview-v7:23.2.0’

2.给RecycleView创建适配器通过

package com.bwei.recyclerviews.adapter;import android.content.Context;import android.os.Handler;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.bwei.recyclerviews.R;import com.squareup.picasso.Picasso;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;/** * 1. 类的用途 * 2. @author forever * 3. @date 2017/9/6 16:06 */public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {    private Context context;    private JSONArray data;    public MyAdapter(Context context, JSONArray data) {        this.context = context;        this.data = data;    }    //创建view设置给ViewHolder    @Override    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, null);        MyViewHolder holder = new MyViewHolder(view);        return holder;    }    //绑定数据    @Override    public void onBindViewHolder(MyViewHolder holder, int position) {        try {            JSONObject jsonObject = data.getJSONObject(position);            String image_url = jsonObject.optString("image_url");            String title = jsonObject.getString("title");            holder.tv_title.setText(title);            ViewGroup.LayoutParams layoutParams = holder.iv.getLayoutParams();            if (position == 0) {                layoutParams.height = 200;            }            holder.iv.setLayoutParams(layoutParams);            Picasso.with(context).load(image_url).placeholder(R.mipmap.ic_launcher).into(holder.iv);        } catch (JSONException e) {            e.printStackTrace();        }    }    //数据长度    @Override    public int getItemCount() {        return data.length();    }    public class MyViewHolder extends RecyclerView.ViewHolder {        private ImageView iv;        private TextView tv_title;        public MyViewHolder(View itemView) {            super(itemView);            iv = (ImageView) itemView.findViewById(R.id.iv);            tv_title = (TextView) itemView.findViewById(R.id.tv_title);        }    }}

3.通过网络请求Json串进行解析添加适配器（实现三种样式）

package com.bwei.recyclerviews.activity;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;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 com.bwei.recyclerviews.R;import com.bwei.recyclerviews.adapter.MyAdapter;import com.bwei.recyclerviews.utils.OkHttp3Utils;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import java.io.IOException;import okhttp3.Call;import okhttp3.Callback;import okhttp3.OkHttpClient;import okhttp3.Response;public class MainActivity extends AppCompatActivity {    private RecyclerView rv;    private String url = "http://result.eolinker.com/iYXEPGn4e9c6dafce6e5cdd23287d2bb136ee7e9194d3e9?uri=one";    private Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            switch (msg.what) {                case 0:                    String json = (String) msg.obj;                    try {                        JSONObject jsonObject = new JSONObject(json);                        JSONArray data = jsonObject.getJSONArray("data");                        //设置适配器                        MyAdapter adapter = new MyAdapter(MainActivity.this, data);                        rv.setAdapter(adapter);                    } catch (JSONException e) {                        e.printStackTrace();                    }                    break;            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //找控件        rv = (RecyclerView) findViewById(R.id.rv);        //获取数据        getData();/**     * 通过这三种方法进行三种不同的样式的显示     */       //设置LinearLayoutManager布局管理器        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);        //设置GridLayoutManager布局管理器        GridLayoutManager gridLayoutManager = new GridLayoutManager(this, 2);        //设置StaggeredGridLayoutManager布局管理器        StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL);        //把布局管理器给RecyclerView        rv.setLayoutManager(staggeredGridLayoutManager);    }    private void getData() {        OkHttp3Utils.doGet(url, new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) throws IOException {                String json = response.body().string();                Message message = handler.obtainMessage(0, json);                message.sendToTarget();            }        });    }}

分装好包调包给RecycleView添加分割线

 //添加华丽分割线        MyDecoration decoration = new MyDecoration(this, LinearLayoutManager.VERTICAL);        rv.addItemDecoration(decoration);        //给表格添加华丽的分割线       /* GridDivider gridDivider = new GridDivider(this, 2, Color.BLUE);        rv.setLayoutManager(gridLayoutManager);        rv.addItemDecoration(gridDivider);*/