专业英语笔记：三次信息化浪潮

   

    

     

      

     
     

      

       package net.hw.car_balance_query;
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      

       import android.app.Activity;
      
     
    

     

      

     
     

      

       import android.os.Bundle;
      
     
    

     

      

     
     

      

       import android.os.Handler;
      
     
    

     

      

     
     

      

       import android.os.Message;
      
     
    

     

      

     
     

      

       import android.util.Log;
      
     
    

     

      

     
     

      

       import android.view.View;
      
     
    

     

      

     
     

      

       import android.widget.EditText;
      
     
    

     

      

     
     

      

       import android.widget.TextView;
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      

       import org.json.JSONException;
      
     
    

     

      

     
     

      

       import org.json.JSONObject;
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      

       import java.io.IOException;
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      

       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 Activity {
      
     
    

     

      

     
     

      
    private static final String BASE_URL = "http://192.168.72.101:8080/transportservice/type/jason/action/";
      
     
    

     

      

     
     

      
    private static final String TAG = "car_balance_query";
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      
    private EditText edtCardId;
      
     
    

     

      

     
     

      
    private Integer carId;
      
     
    

     

      

     
     

      
    private TextView tvCarBalance;
      
     
    

     

      

     
     

      
    private Handler handler;
      
     
    

     

      

     
     

      
    private Thread thread;
      
     
    

     

      

     
     

      
    private Integer balance;
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      
    @Override
      
     
    

     

      

     
     

      
    protected void onCreate(Bundle savedInstanceState) {
      
     
    

     

      

     
     

      
        super.onCreate(savedInstanceState);
      
     
    

     

      

     
     

      
        // 利用布局资源文件设置用户界面
      
     
    

     

      

     
     

      

               setContentView(R.layout.activity_main);
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      
        // 通过资源标识获得控件实例
      
     
    

     

      

     
     

      

               tvCarBalance = findViewById(R.id.tvCarBalance);
      
     
    

     

      

     
     

      

               edtCardId = findViewById(R.id.edt_car_id);
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      
        // 实例化消息处理器
      
     
    

     

      

     
     

      

               handler = new Handler() {
      
     
    

     

      

     
     

      
            @Override
      
     
    

     

      

     
     

      
            public void handleMessage(Message msg) {
      
     
    

     

      

     
     

      
                switch (msg.what) {
      
     
    

     

      

     
     

      
                    case 0x0001:
      
     
    

     

      

     
     

      

                               tvCarBalance.setText("请求连接失败！");
      
     
    

     

      

     
     

      
                        break;
      
     
    

     

      

     
     

      
                    case 0x0002:
      
     
    

     

      

     
     

      

                               tvCarBalance.setText(balance + "元");
      
     
    

     

      

     
     

      
                        break;
      
     
    

     

      

     
     

      

                       }
      
     
    

     

      

     
     

      

                   }
      
     
    

     

      

     
     

      

               };
      
     
    

     

      

     
     

      

           }
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      
    /**
      
     
    

     

      

     
     

      

        * 查询小车余额事件处理方法
      
     
    

     

      

     
     

      

        */
      
     
    

     

      

     
     

      
    public void doQueryBalance(View view) {
      
     
    

     

      

     
     

      
        // 获取小车编号
      
     
    

     

      

     
     

      

               carId = Integer.parseInt(edtCardId.getText().toString());
      
     
    

     

      

     
     

      
        // 定义okhttp客户端
      
     
    

     

      

     
     

      
        OkHttpClient mOkHttpClient = new OkHttpClient();
      
     
    

     

      

     
     

      
        // 定义媒体类型
      
     
    

     

      

     
     

      
        MediaType mediaType = MediaType.parse("application/json; charset=utf-8");
      
     
    

     

      

     
     

      
        // 定义请求主体
      
     
    

     

      

     
     

      
        RequestBody requestBody = RequestBody.create(mediaType, "{'CarId':" + carId + "}");
      
     
    

     

      

     
     

      
        // 定义请求对象
      
     
    

     

      

     
     

      
        Request request = new Request.Builder().url(BASE_URL + "GetCarAccountBalance.do")
      
     
    

     

      

     
     

      

                       .post(requestBody).build();
      
     
    

     

      

     
     

      
        // 基于请求对象创建调用对象
      
     
    

     

      

     
     

      
        Call call = mOkHttpClient.newCall(request);
      
     
    

     

      

     
     

      
        // 将调用对象放入队列异步执行
      
     
    

     

      

     
     

      

               call.enqueue(new Callback() {
      
     
    

     

      

     
     

      
            @Override
      
     
    

     

      

     
     

      
            public void onFailure(Call call, IOException e) {
      
     
    

     

      

     
     

      
                // 创建子线程，往主线程发送消息
      
     
    

     

      

     
     

      

                       thread = new Thread(new Runnable() {
      
     
    

     

      

     
     

      
                    @Override
      
     
    

     

      

     
     

      
                    public void run() {
      
     
    

     

      

     
     

      

                               handler.sendEmptyMessage(0x0001);
      
     
    

     

      

     
     

      

                           }
      
     
    

     

      

     
     

      

                       });
      
     
    

     

      

     
     

      
                // 启动线程
      
     
    

     

      

     
     

      

                       thread.start();
      
     
    

     

      

     
     

      

                   }
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      
            @Override
      
     
    

     

      

     
     

      
            public void onResponse(Call call, Response response) throws IOException {
      
     
    

     

      

     
     

      
                // 从响应对象里获取json字符串
      
     
    

     

      

     
     

      
                String json = response.body().string();
      
     
    

     

      

     
     

      

                       Log.d("hw", json);
      
     
    

     

      

     
     

      
                try {
      
     
    

     

      

     
     

      
                    // 基于json字符串创建json对象
      
     
    

     

      

     
     

      
                    JSONObject jsonObject = new JSONObject(json);
      
     
    

     

      

     
     

      
                    // 获取服务器信息字符串
      
     
    

     

      

     
     

      
                    String serverinfo = jsonObject.getString("serverinfo");
      
     
    

     

      

     
     

      
                    // 基于json字符串创建json对象
      
     
    

     

      

     
     

      
                    JSONObject jsonObject1 = new JSONObject(serverinfo);
      
     
    

     

      

     
     

      
                    // 获取余额
      
     
    

     

      

     
     

      

                           balance = jsonObject1.getInt("Balance");
      
     
    

     

      

     
     

      
                    // 创建子线程，往主线程发送消息
      
     
    

     

      

     
     

      

                           thread = new Thread(new Runnable() {
      
     
    

     

      

     
     

      
                        @Override
      
     
    

     

      

     
     

      
                        public void run() {
      
     
    

     

      

     
     

      

                                   handler.sendEmptyMessage(0x0002);
      
     
    

     

      

     
     

      

                               }
      
     
    

     

      

     
     

      

                           });
      
     
    

     

      

     
     

      
                    // 启动线程
      
     
    

     

      

     
     

      

                           thread.start();
      
     
    

     

      

     
     

      

                       } catch (JSONException e) {
      
     
    

     

      

     
     

      

                           e.printStackTrace();
      
     
    

     

      

     
     

      

                       }
      
     
    

     

      

     
     

      

                   }
      
     
    

     

      

     
     

      

               });
      
     
    

     

      

     
     

      

           }
      
     
    

     

      

     
     

      

       }