OkHttp+RecycleView展示网络数据

最新推荐文章于 2020-03-24 10:15:18 发布

原创最新推荐文章于 2020-03-24 10:15:18 发布 · 647 阅读

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本文详细介绍了如何在Android应用中结合OkHttp进行网络请求，并利用RecyclerView展示加载的数据。步骤包括设置依赖和权限，定义布局文件，封装接口数据，创建网络请求工具类以及回调接口，最后在MainActivity中实现数据加载。

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1、依赖，权限

compile 'com.android.support:recyclerview-v7:26.0.0-alpha1'
compile 'com.squareup.okhttp3:okhttp:3.8.1'
compile 'com.google.code.gson:gson:2.8.2'
compile 'com.github.bumptech.glide:glide:3.5.2'

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

2、布局

activity_layout、

<android.support.v7.widget.RecyclerView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/rv">
</android.support.v7.widget.RecyclerView>

item、

<ImageView
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:id="@+id/iv"
    android:src="@mipmap/ic_launcher"
    />
<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/tv"
    android:textSize="20sp"
    android:text="1111" />

3、News(封装接口数据)

4、OkhttpUtils(网络请求数据接口类)

import android.os.Handler;
import android.os.Message;
import com.google.gson.Gson;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class OkhttpUtils {
    private Handler hand=new Handler();
    private NetDataCallback netDataCallback;
    public <T>void getdata(String url, final NetDataCallback netDataCallback, final Class<T> tclass) {
        //初始化一个 OkHttpClient 并且设置连接和读取超时时间
        OkHttpClient okhttp=new OkHttpClient.Builder()
                .connectTimeout(10, TimeUnit.SECONDS)
                .readTimeout(20, TimeUnit.SECONDS)
                .build();
        Request request=new Request.Builder().url(url).build();
        Call call = okhttp.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                netDataCallback.fail(499,e.getMessage());
            }
            //请求成功
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                Gson gson=new Gson();
                T t = gson.fromJson(response.body().string(), tclass);
                final Message msg = Message.obtain();
                /*msg.what=ok;*/
                msg.obj=t;
                hand.post(new Runnable() {
                    @Override
                    public void run() {
                        netDataCallback.success(msg.obj);
                    }
                });
            }
        });
    }
}

5、NetDataCallback(接口类)

public interface NetDataCallback<T> {
    void success(T t);
    void fail(int code,String str);
}

6、Myadapter(适配器)

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.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;

import java.util.ArrayList;

public class Myadapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    private ArrayList<News.DataBean> mlist=new ArrayList<News.DataBean>();
    private Context mcontext;
    public Myadapter(ArrayList<News.DataBean> mlist, Context mcontext) {
        this.mlist = mlist;
        this.mcontext = mcontext;
    }
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(mcontext);
        View view = inflater.inflate(R.layout.item, parent, false);
        RecyclerView.ViewHolder holder=null;
        holder=new ViewHolder(view);
        return holder;
    }
    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        //先进行强转
        ViewHolder holder1 = (ViewHolder) holder;
        //绑定数据
        holder1.tv.setText(mlist.get(position).getContent());
        Glide.with(mcontext).load(mlist.get(position).getUser().getIcon()).into(holder1.iv);
    }
    @Override
    public int getItemCount() {
        return mlist==null?0:mlist.size();
    }
    //定义一个ViewHolder
    class ViewHolder extends RecyclerView.ViewHolder{
        private TextView tv;
        private ImageView iv;
        public ViewHolder(View itemView) {
            super(itemView);
            tv=(TextView)itemView.findViewById(R.id.tv);
            iv=(ImageView)itemView.findViewById(R.id.iv);
        }
    }
}

7、MainActivity

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity implements NetDataCallback<News> {
    private Myadapter md;
    private ArrayList<News.DataBean> mlist;
    private RecyclerView mrv;
    private OkhttpUtils mutils;
    private String url = "https://www.zhaoapi.cn/quarter/getJokes?page=1&token=22DEA5174137AE5352E8A7A606C8EA06&source=android&appVersion=101";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mrv = (RecyclerView) findViewById(R.id.rv);
        //开始进行网络请求
        initdata();
    }
    //网络请求
    private void initdata() {
        mutils = new OkhttpUtils();
        mutils.getdata(url, this, News.class);
    }
    @Override
    public void success(News news) {
        //得到集合类（这一步千万不能落下，否则得不到数据）
        mlist = (ArrayList<News.DataBean>) news.getData();
        //设置适配器
        md = new Myadapter(mlist, this);
        //LinearLayout管理器(线性布局管理器)
        //  1、mrv.setLayoutManager(new LinearLayoutManager(this));
        /*
        *  (1)Context
        *  (2)方向，上面的是水平方向，还可以选择垂直方向LinearLayoutManager.VERTICAL
        *  (3)是否颠倒循序，这个是针对数据源的，就是把你传进去的数据进行倒着显示，比如你穿进去的集合是{1,2,3,4},那么这个参数为false的时候，显示的是1,2,3,4,但是如果你选择的是true，显示的是4,3,2,1。
        * */
        //2、mrv.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));

        /*
         *  GridLayout管理器（网格布局管理器）
         * (1)Context  (2)显示多少列
        */
        // 1、 mrv.setLayoutManager(new GridLayoutManager(this,2));
        
        /*
        *   瀑布流布局管理器(StaggeredLayouManager):
        *  (1)Context  (2)显示列数
        * */
        mrv.setLayoutManager(new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL));
        //设置分割线
        mrv.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));
        //设置适配器
        mrv.setAdapter(md);
    }
    @Override
    public void fail(int code, String str) {}
}