2021/1/28

recyclerview

package com.example.myapplication;

public class music {
    private String url;
    private String mname;
    private String geshou;

    public music(String url, String mname, String geshou) {
        this.url = url;
        this.mname = mname;
        this.geshou = geshou;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getMname() {
        return mname;
    }

    public void setMname(String mname) {
        this.mname = mname;
    }

    public String getGeshou() {
        return geshou;
    }

    public void setGeshou(String geshou) {
        this.geshou = geshou;
    }
}

package com.example.myapplication;

import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.widget.Toast;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerreview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;


import net.sf.json.JSONArray;
import net.sf.json.JSONException;
import net.sf.json.JSONObject;


import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class MainActivity extends AppCompatActivity {


    private List<music> list=new ArrayList<>();
    RecyclerView recyclerView;
    Handler handler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            if(msg.what==111){
                list=(List<music>)msg.obj;
                LinearLayoutManager layoutManager = new LinearLayoutManager(MainActivity.this);
                recyclerView.setLayoutManager(layoutManager);
                FruitAdapter adapter = new FruitAdapter(list);
                adapter.setOnItemClickListener(new FruitAdapter.OnItemClickListener() {
                    @Override
                    public void onClick(int position) {

                        if(position==1) {
                            Intent intent = new Intent();
                            intent.setClass(MainActivity.this, Main2Activity.class);
                            intent.putExtra("url",list.get(position).getUrl());
                            MainActivity.this.startActivity(intent);

                        }
                        Toast.makeText(getBaseContext(), "点击的是" + position + "的itemClick", Toast.LENGTH_SHORT).show();
                    }
                });
                recyclerView.setAdapter(adapter);
            }
        }
    };

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

        //initFruits();
        recyclerView = findViewById(R.id.recycler_view);
        /*
        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);
        FruitAdapter adapter = new FruitAdapter(fruitList);
        adapter.setOnItemClickListener(new FruitAdapter.OnItemClickListener() {
            @Override
            public void onClick(int position) {

                if(position==1) {
                    Intent intent = new Intent();
                    intent.setClass(MainActivity.this, Main2Activity.class); //设置跳转的Activity
                    MainActivity.this.startActivity(intent);

                }
                Toast.makeText(getBaseContext(), "点击的是" + position + "的itemClick", Toast.LENGTH_SHORT).show();
            }
        });
        recyclerView.setAdapter(adapter);

         */
        nettest();
    }
    public void nettest(){
        String path="http://39.103.179.153:8080/first/Servlet?method=bianli";
        OkHttpClient client = new OkHttpClient();
        JSONObject jsob = new JSONObject();
        try {
            jsob.put("id", "123");

        } catch (JSONException e) {
            e.printStackTrace();
        }
        MediaType type1 = MediaType.parse("appliaction/json;charset=utf-8");
        RequestBody body1 = RequestBody.create(type1, jsob + "");
        Request request = new Request.Builder()
                .url(path)
                .post(body1)
                .build();
        client.newCall(request).enqueue(new Callback() {
            //失败
            @Override
            public void onFailure(Call call, IOException e) {
                Looper.prepare();

                AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();
                alertDialog.setMessage("网络或服务器原因注册失败");
                alertDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "我知道了", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                    }
                });
                alertDialog.show();
                Looper.loop();
            }
            //成功
            @Override
            public void onResponse(Call call, Response response) throws IOException {
               // Looper.prepare();
                String result = response.body().string();
                JSONArray jsar = JSONArray.fromObject(result);
                List<music> list1 = new ArrayList<>();
                music bean = null;
                for (int i = 0; i < jsar.size(); i++) {
                    JSONObject jsob = jsar.getJSONObject(i);
                    String url = jsob.getString("url");
                    String manme=jsob.getString("mname");
                    String geshou=jsob.getString("geshou");
                    bean=new music(url,manme,geshou);
                    list1.add(bean);
                }
                //Toast.makeText(getBaseContext(), "点击的是" + list1.get(0).getGeshou() + "的itemClick"+list1.get(0).getMname(), Toast.LENGTH_SHORT).show();
                //Looper.loop();
                Message message=handler.obtainMessage();
                message.what=111;
                message.obj=list1;
                handler.sendMessage(message);
            }
        });

    }
    /*
    private void initFruits() {
        for (int i = 0; i < 2; i++) {
            Fruit apple = new Fruit("Apple", R.drawable.mm);
            fruitList.add(apple);
            Fruit banana = new Fruit("Banana", R.drawable.mm);
            fruitList.add(banana);
            Fruit orange = new Fruit("Orange", R.drawable.mm);
            fruitList.add(orange);
            Fruit watermelon = new Fruit("Watermelon", R.drawable.mm);
            fruitList.add(watermelon);
            Fruit pear = new Fruit("Pear", R.drawable.mm);
            fruitList.add(pear);
            Fruit grape = new Fruit("Grape", R.drawable.mm);
            fruitList.add(grape);
            Fruit pineapple = new Fruit("Pineapple", R.drawable.mm);
            fruitList.add(pineapple);


        }
    }

     */
}

package com.example.myapplication;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.recyclerview.widget.RecyclerView;

import java.util.List;

public class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder> {

    private List<music> mFruitList;

    static class ViewHolder extends RecyclerView.ViewHolder {
        ImageView fruitImage;
        TextView fruitName;
        TextView singertext;

        public ViewHolder(View view) {
            super(view);
            fruitImage = (ImageView) view.findViewById(R.id.fruit_image);
            fruitName = (TextView) view.findViewById(R.id.music);
            singertext=view.findViewById(R.id.singer);
        }

    }

    public FruitAdapter(List<music> fruitList) {
        mFruitList = fruitList;
    }

    @Override

    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fruit_item, parent, false);
        ViewHolder holder = new ViewHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, final int position) {
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (onItemClickListener != null)
                    onItemClickListener.onClick(position);
            }
        });

        music fruit = mFruitList.get(position);
        holder.fruitImage.setImageResource(R.drawable.mm);
        holder.fruitName.setText("歌名:"+fruit.getMname());
        holder.singertext.setText("歌手:"+fruit.getGeshou());
    }

    @Override
    public int getItemCount() {
        return mFruitList.size();
    }
    public interface OnItemClickListener {
        void onClick(int position);
    }

    OnItemClickListener onItemClickListener;


    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
        this.onItemClickListener = onItemClickListener;
    }

}