直接存入数据库

package com.example.zhuhuohuo;

import android.content.ContentValues;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;

import com.example.zhuhuohuo.adpter.MyAdapter;
import com.example.zhuhuohuo.bean.User;
import com.example.zhuhuohuo.dao.sqldao;
import com.example.zhuhuohuo.utiles.HttpUtils;
import com.google.gson.Gson;

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

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

private String mUrl = "https://suggest.taobao.com/sug?code=utf-8&q=%E6%89%8B%E6%9C%BA";
private Button hq_btn;
private ListView show_lv;
private MyAdapter mAdapter;
private List<List<String>> mList = new ArrayList<>();
private sqldao sqldao;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    initView();
    //异步
   
    mAdapter = new MyAdapter(MainActivity.this,mList);
    show_lv.setAdapter(mAdapter);
    show_lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {

            AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
            builder.setIcon(R.drawable.ic_launcher_background);
            builder.setTitle("系统提示");
            builder.setMessage("确认要删除吗？");
            builder.setPositiveButton("确认", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    mList.remove(position);
                    mAdapter.notifyDataSetChanged();
                }
            });
            builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                }
            });
            AlertDialog creat = builder.create();
            creat.show();
        }
    });
    sqldao  = new sqldao(MainActivity.this);
    if (sqldao.selectData().isEmpty()){
        new MyTask().execute(mUrl);
    }else {
        String json = sqldao.selectData();
        Gson gson = new Gson();
        User user = gson.fromJson(json, User.class);
        mList.addAll(user.getResult());
        mAdapter.notifyDataSetChanged();
    }
   
}

private void initView() {
    show_lv = (ListView) findViewById(R.id.show_lv);
}

@Override
public void onClick(View v) {
}

//定义一个类继承AsyncTask
class MyTask extends AsyncTask<String, Void, List<List<String>>> {

    @Override
    protected List<List<String>> doInBackground(String... strings) {
        String data = HttpUtils.getData(strings[0]);
        Gson gson = new Gson();
        User user = gson.fromJson(data, User.class);
        ContentValues contentValues = new ContentValues();
        contentValues.put("json",data);
        sqldao.insertData(contentValues);
        return user.getResult();
    }

    @Override
    protected void onPostExecute(List<List<String>> lists) {
        super.onPostExecute(lists);
        mList.addAll(lists);
        mAdapter.notifyDataSetChanged();
    }
}

}