MainActivity(app)-优快云博客

本文介绍了一个安卓应用如何从网络获取数据，并将这些数据解析后显示在RecyclerView中，同时将数据保存到本地数据库的方法。主要涉及的技术包括：使用XUtils进行HTTP请求、Gson库解析JSON数据、SQLite数据库操作及RecyclerView的适配。

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package alice.bw.com.day04_yuekaodemo;

import android.content.ContentValues;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;

import com.google.gson.Gson;

import org.xutils.common.Callback;
import org.xutils.http.RequestParams;
import org.xutils.x;

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

import alice.bw.com.day04_yuekaodemo.adapter.MyRecyclerAdapter;
import alice.bw.com.day04_yuekaodemo.db.MySQliteOpenHelper;
import alice.bw.com.day04_yuekaodemo.domain.Food;

public class MainActivity extends AppCompatActivity {
    private RecyclerView recycler;

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

    }

    private void parseJson(String json) {
        Gson gson = new Gson();
        Food food = gson.fromJson(json, Food.class);
        List<Food.DataBean> list = new ArrayList<>();
        for (int i = 0; i < food.getData().size(); i++) {
            list.add(food.getData().get(i));
        }
        addRecycler(list);
        addDataBase(list);
    }
    //数据源与RecyclerView绑定
    private void addRecycler(List<Food.DataBean> list) {
        MyRecyclerAdapter adapter = new MyRecyclerAdapter(list, this);
        recycler.setAdapter(adapter);
    }

    //将从网络上获取的数据添加到数据库中
    private void addDataBase(List<Food.DataBean> list) {
        MySQliteOpenHelper mySQLiteDataBase = new MySQliteOpenHelper(this);
        SQLiteDatabase database = mySQLiteDataBase.getWritableDatabase();

        for (int i = 0; i < list.size(); i++) {
            ContentValues values = new ContentValues();
            values.put("pic", list.get(i).getPic());
            values.put("title", list.get(i).getTitle());
            database.insert("data", null, values);
        }
    }
    //从网络上获取数据并解析
    private void getData() {
        String path = "http://www.qubaobei.com/ios/cf/dish_list.php?stage_id=1&limit=20&page=1";
        RequestParams requestParams = new RequestParams(path);
        x.http().get(requestParams, new Callback.CommonCallback<String>() {
            @Override
            public void onSuccess(String result) {
                parseJson(result);//解析数据
            }

            @Override
            public void onError(Throwable ex, boolean isOnCallback) {

            }

            @Override
            public void onCancelled(CancelledException cex) {

            }

            @Override
            public void onFinished() {

            }
        });
    }

    public void click(View view) {
        switch (view.getId()) {
            case R.id.btn_gps:
                startActivity(new Intent(this, GpsActivity.class));//跳转到GPS页面
                break;

            case R.id.btn_bluetooth:
                startActivity(new Intent(this,BluetoothActivity.class));//跳转到蓝牙页面
                break;
        }
    }

    private void initView() {
        recycler = (RecyclerView) findViewById(R.id.recycler);

        LinearLayoutManager manager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
        recycler.setLayoutManager(manager);
        getData();
    }

}