android开发中应用程序与Web的数据交互

来源：爱站网时间：2021-03-16编辑：网友分享

Web

android开发中数据交互通常是使用MySQL数据库、Apache服务器和PHP语言进行操作的，而对于交互每个人的理解可能不太一样，下面是爱站技术频道小编介绍的android开发中应用程序与Web的数据交互，希望大家都能有所收获。

实现流程

流程说明

Andorid Server端对MySql数据库进行简单的查询操作，并将查询数据结果转换为Json格式提供给Andorid利用OKhttp读取再解析Json展示到APP上；同时Andorid端利用OKhttp提交给Andorid Server端，由Server端对MySql数据库对提交数据的添加。
Apache Server端通过解析PHP源代码，对MySql数据库的增删查改显示在WebSite。

具体实现

Andorid Server

获取数据

get_all_found_items.php

 0) { 
  // looping through all results 
  // items node 
  $response["items"] = array(); 
  
  while ($row = mysql_fetch_array($result)) { 
    // temp user array 
    $items = array(); 
    $items["what"] = $row["what"]; 
    $items["when"] = $row["when"]; 
    $items["where"] = $row["where"]; 
    $items["detail"] = $row["detail"];
    $items["posttime"] = $row["posttime"];  
 $resultcontcat = mysql_query("SELECT *FROM guests") or die(mysql_error()); 
 while ($row1 = mysql_fetch_array($resultcontcat)) { 
  if ($row1["id"] == $row["gid"]){
  $items["contact"] = $row1["contact"];
  }
  }
    // push single items into final response array 
    array_push($response["items"], $items); 
  } 
  // success 
  $response["success"] = 1; 
  
  // echoing JSON response 
  echo json_encode($response,JSON_UNESCAPED_UNICODE); 
} else { 
  // no items found 
  $response["success"] = 0; 
  $response["message"] = "No items found"; 
  
  // echo JSON 
  echo json_encode($response,JSON_UNESCAPED_UNICODE); 
} 
?>

如以上PHP代码可知通过require_once()函数包含db_connect.php文件，执行数据库配置文件。定义数组$response接收查询的数据结果，通过判断不同的情况赋值$response[“success”]，并返回到Web页面显示

PHP文件执行结果

JSON

 {
  "items": [
    {
      "what": "手表",
      "when": "2017-10-21 00:00:00",
      "where": "北区宿舍楼#504",
      "detail": "白色的手表，XX品牌",
      "posttime": "2017-10-21 13:03:09",
      "contact": "138123456"
    },
    {
      "what": "手机",
      "when": "2017-10-04 00:00:00",
      "where": "北区商店#111",
      "detail": "iphone6s,土豪金",
      "posttime": "2017-10-21 13:03:46",
      "contact": "137123456"
    },
    {
      "what": "电脑",
      "when": "2017-10-21 14:39:54",
      "where": "图书馆#203",
      "detail": "联想品牌笔记本",
      "posttime": "2017-10-21 17:08:14",
      "contact": "5670001"
    },
    {
      "what": "细说PHP",
      "when": "2017-09-21 13:03:46",
      "where": "南馆#403",
      "detail": "黑色封面，第二版《细说PHP》",
      "posttime": "2017-10-21 17:36:53",
      "contact": "63513641"
    }
  ],
  "success": 1
}

提交数据

create_found_items.php

判断GET请求的参数是否都存在，把获取的GET请求参数作为数据INSERT TO MySQL数据库。判断INSERT执行过程赋值$response[“success”]对应相应的$response[“message”]，显示在Web页面。

执行结果

Andorid

获取数据

核心代码 queryLosts()函数

private void queryLosts() {
 losts.clear();
 new Thread(new Runnable() {
 
 @Override
 public void run() {
  // TODO Auto-generated method stub
  
     OkHttpClient okHttpClient = new OkHttpClient();
     String url = "http://webSite/androidapi/get_all_lost_items.php";
     Request request = new Request.Builder()
         .url(url)
         .build();
     Call call = okHttpClient.newCall(request);
     try {
       Response response = call.execute();
       String res = response.body().string();
       if (res != null && !res.trim().equals("")){
         JSONObject jsonObject = new JSONObject(res);
         if (jsonObject.getInt("success") == 1){
           JSONArray jsonArray = jsonObject.getJSONArray("items");
           for (int i = jsonArray.length() - 1;i >= 0;i--){
             JSONObject item = jsonArray.getJSONObject(i);
             String what = null;
             try {
               what = item.getString("what");
             }catch (Exception e){
             }
             String when = null;
             try{
               when = item.getString("when");
             }catch (Exception e){
             }
             String where = null;
             try{
               where = item.getString("where");
             }catch (Exception e){
             }
             String detail = null;
             try {
               detail = item.getString("detail");
             }catch (Exception e){
             }
             String contact = null;
             try {
               contact = item.getString("contact");
             }catch (Exception e){
             }
             Lost lost = new Lost();
             lost.setTitle(what);
             String des = "地点：" + (where == null?"":where) +"   "+"时间：" + (when == null?"":when)+"\r" + "   "+"描述：" + (detail == null?"":detail);
             lost.setDescribe(des);
             lost.setPhone(contact == null?"":contact);
             losts.add(lost);
           }
         }
       }
     } catch (Exception e) {
       e.printStackTrace();
       showErrorView(0);
     }
     if (losts == null || losts.size() == 0) {
     handler.sendEmptyMessage(1);
       return;
     }
     if (losts.size() > 0){
      handler.sendEmptyMessage(2);
     }
 }
 }).start();

利用Android网络框架OKhttp,OKhttp一个处理网络请求的开源项目,是安卓端最火热的轻量级框架.请求接口url地址，获取Json数据利用JSONObject对Json数据进行解析。

提交数据

核心代码 addLost()函数

public Handler handler = new Handler(){
 public void handleMessage(android.os.Message msg) {
 switch(msg.what){
  case 1:
  Toast.makeText(this,"提交成功",Toast.LENGTH_LONG).show();
  break;
  case 2:
  Toast.makeText(this,"提交失败",Toast.LENGTH_LONG).show();
  break;
 }
 }
};
private void addLost(){
 OkHttpClient okHttpClient = new OkHttpClient();
 String url ="http://website/androidapi/create_lost_items.php?what="+title+"&when="+time+"&where="+place+"&detail="+describe+"&contact="+photo+"";
 Request request = new Request.Builder()
  .url(url)
  .build();
 
 try{
 Response response = okHttpClient.newCall(request).execute();
 res = response.body().string();
 handler.sendEmptyMessage(1);
 }catch (Exception e)
 {
 e.printStackTrace();
 handler.sendEmptyMessage(2);
 }
}

同样利用Okhttp,GET方式提交参数，try-catch获取异常，通过返回值给出一定的提交结果提示。

代码测试

数据同步

Web端