关于接口的初步练习

这是主函数

package com.example.com.webtext;

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

import com.bumptech.glide.Glide;

import org.json.JSONArray;
import org.json.JSONObject;

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

import static com.example.com.webtext.R.id.button;

public class MainActivity extends AppCompatActivity implements View .OnClickListener{
    private List<massage > Mymassage=new ArrayList<>() ;
    TextView nameText;
    TextView summaryText;
    ImageView img;
    Button sendRequest;
    private static final String TAG = "MainActivity";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sendRequest=(Button) findViewById(button) ;
        nameText =(TextView) findViewById(R.id.name ) ;
        summaryText =(TextView) findViewById(R.id.summery);
        img=(ImageView)  findViewById(R.id.photo) ;
        sendRequest .setOnClickListener(this) ;
    }

    @Override
    public void onClick(View v ){
        if(v.getId() == button){
            HttpUtil .sendHttpRequest("https://qcloud.waydrow.com/LoveInn/index.php/Home/App/getInfoList",new HttpCallbackListener(){
                @Override
                public void onFinish(String response){
                    //Log.d(TAG, "onFinish: "+response);
                    parseJSONWithJSONObject(response );
                }
                @Override
                public void onError(Exception e){
                    e.printStackTrace();;
                }
            });
        }
        setRecyclerview();
    }
    private void parseJSONWithJSONObject(String jsonData){
        try{
            JSONArray jsonArray =new JSONArray(jsonData ) ;
            for(int i=0;i<jsonArray .length() ;i++) {
                JSONObject jsonObject = jsonArray.getJSONObject(i);
                String name = jsonObject.getString("name");
                String summary = jsonObject.getString("summary");
                String imgUrl = "https://qcloud.waydrow.com" + jsonObject.getString("photo");
                massage massage1 = new massage(name, summary, imgUrl);
                Mymassage.add(massage1);
            }
        }
        catch (Exception e){
            e.printStackTrace() ;
        }
    }
    public void setRecyclerview(){
        RecyclerView recyclerView =(RecyclerView ) findViewById(R.id.recycler_view);
        StaggeredGridLayoutManager LayoutManager=new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL) ;
        recyclerView.setLayoutManager(LayoutManager);
        adapter Adapter =new adapter(Mymassage );
        recyclerView.setAdapter(Adapter);
        Mymassage =null ;
    }
}

这是开启连接的类

package com.example.com.webtext;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;

/**
 * Created by 定不负相思懿 on 2017/5/10.
 */

public class HttpUtil {
    public static void sendHttpRequest(final String adress,final HttpCallbackListener linsener){
        new Thread(new Runnable() {
            @Override
            public void run() {
                HttpURLConnection connection =null ;
                BufferedReader reader =null;
                try {
                    URL url=new URL(adress);
                    connection =(HttpURLConnection ) url.openConnection() ;
                    connection .setRequestMethod("GET");
                    connection .setConnectTimeout(8000);
                    connection .setReadTimeout(8000);
                    connection .setDoInput(true);
                    connection .setDoOutput(true);
                    InputStream in=connection.getInputStream();
                    reader =new BufferedReader(new InputStreamReader(in)) ;
                    StringBuilder response=new StringBuilder();
                    String line;
                    while((line=reader .readLine()) !=null){
                       response .append(line) ;
                    }
                    if(linsener !=null){
                        linsener.onFinish(response .toString());
                    }
                } catch (ProtocolException e) {
                    linsener.onError(e);
                } catch (MalformedURLException e) {
                    linsener.onError(e);
                } catch (IOException e) {
                    linsener.onError(e);
                } finally{
                    if(connection!=null ){
                        connection .disconnect();
                    }
                }
            }
        }).start(); ;
    }
}

还有类和adapter

package com.example.com.webtext;

/**
 * Created by 定不负相思懿 on 2017/5/11.
 */

public class massage {
    String name;
    String summary;
    String photo;
    public massage(String name, String summary, String photo){
        this.name =name;
        this.summary =summary ;
        this.photo =photo;
    }
    public String getname(){
        return name;
    }
    public String getsummary (){
        return summary ;
    }
    public String getphoto(){
        return photo;
    }
}

package com.example.com.webtext;

import android.content.Context;
import android.content.Intent;
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.List;

/**
 * Created by 定不负相思懿 on 2017/5/11.
 */

public class adapter extends RecyclerView.Adapter<adapter .ViewHolder >{
    private List<massage> mymassage;
    public adapter (List<massage> fruit3){
        mymassage=fruit3;
    }
    static class ViewHolder extends RecyclerView.ViewHolder {
        ImageView image;
        TextView name;
        TextView summary;
        View fruitview;
        Context context1;
        public ViewHolder(View view) {
            super(view);
            fruitview =view;
            image=(ImageView ) view.findViewById(R.id.photo) ;
            name =(TextView ) view.findViewById(R.id.name) ;
            summary =(TextView ) view.findViewById(R.id.summery) ;
        }

    }
    @Override
    public ViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {
        View view= LayoutInflater.from(parent .getContext() ).inflate(R.layout.recyclerview_layout,parent ,false ) ;
        final ViewHolder holder=new ViewHolder(view );
        holder.context1=parent .getContext() ;
        holder.fruitview.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                int position=holder.getAdapterPosition() ;
                massage  massage =mymassage  .get(position );
            }
        }) ;
        return holder ;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        massage mymassage1=mymassage.get(position );
        holder .name.setText(mymassage1  .getname() ) ;
        holder .summary .setText(mymassage1 .getsummary() ) ;
        Glide.with(holder .context1).load(mymassage1.getphoto()).into(holder.image );
    }
    @Override
    public int getItemCount() {
        return mymassage .size() ;
    }
}

最重要的！就是接口

public interface HttpCallbackListener {

    void onFinish(String response);
    void onError(Exception e);

}

虽然看着接口很简单，但是...用起来就知道了。当你会的时候就会发现真的很方便，但是如果你不会的话，不如直接写函数。