OkHttp+Handler+listview

package bwie.caipu;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.GridView;

import com.google.gson.Gson;

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

import Util.OkHttpUtils;
import bean.Bean;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;

public class MainActivity extends AppCompatActivity {

    private String time;
    private ArrayAdapter<Bean.TngouBean> adapter;
    private EditText ed;
    private GridView lv;
    private Button btn;
    private List<Bean.TngouBean> list;
    Handler handler = new Handler() {


        @Override
        public void handleMessage(Message msg) {
            String str = (String) msg.obj;
            Gson gson = new Gson();
            Bean be = gson.fromJson(str, Bean.class);
            list = be.getTngou();
            adapter = new ArrayAdapter<Bean.TngouBean>(MainActivity.this, android.R.layout.simple_list_item_1, list);
            lv.setAdapter(adapter);
            super.handleMessage(msg);
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ed = (EditText) findViewById(R.id.et);
        lv = (GridView) findViewById(R.id.listView);
        btn = (Button) findViewById(R.id.but);
        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                Intent intent = new Intent(MainActivity.this, Activitysec.class);
                intent.putExtra("id", list.get(i - 1).getId());
                startActivity(intent);
            }
        });
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String name = ed.getText().toString();
                for (Bean.TngouBean li : list) {
                    if (name.equals(li.getName())) {
                        Intent intent = new Intent(MainActivity.this, Activitysec.class);
                        intent.putExtra("id", li.getId());
                        startActivity(intent);
                    }
                }
            }
        });
        getEnqueue();
    }

    private void getEnqueue() {
        OkHttpUtils.get("http://www.tngou.net/api/cook/classify",
                new Callback() {
                    @Override
                    public void onFailure(Call call, IOException e) {
                    }
                    @Override
                    public void onResponse(Call call, Response response) throws IOException {
                        final String result = response.body().string();
                        Message msg = Message.obtain();
                        msg.obj = result;
                        handler.sendMessage(msg);
                    }
                });
    }
}

Glide.with(context)
                .load("http://tnfs.tngou.net/image" + tn.getImg())
                .placeholder(R.mipmap.ic_launcher)
                .into(vh.imageView);