2018-03-07 15:46
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My application get JSON data from server. If I use my own json api , data is loaded only in internet connection. But if I use this api (, data is displayed also in offline, once application got internet connection.

The same code, one json url is loaded also after the loss of internet connectivity, another one's data doesn't display after internet disconnection. How to store data in android cache from server-side as this URL (

My api (api1.php)

header('Content-Type: application/json');

    $query="SELECT * FROM implink";
$result = $con->query('SELECT id,heading,content FROM implink');
$rows = $result->fetchAll(PDO::FETCH_ASSOC);
header('Content-Type: application/json;charset=utf-8');
echo json_encode(['info' => $rows],

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我的应用程序从服务器获取JSON数据。 如果我使用我自己的json api ,则数据仅在互联网连接中加载。 但是如果我使用这个api( https: 应用程序上网后// ),数据也会在离线状态下显示 连接。

相同的代码,在失去互联网连接后也会加载一个json url,互联网断开连接后不显示另一个数据。 如何从服务器端将数据存储在android缓存中作为此URL( )。


 require(“include /”  connect.php“); 
header('Content-Type:application / json'); 
 $ query =”SELECT * FROM implink“; 
 $ result = $ con&gt; query('SELECT id, 标题,内容FROM implink'); 
 $ rows = $ result-&gt; fetchAll(PDO :: FETCH_ASSOC); 
header('Content-Type:application / json; charset = utf-8'); 
echo json_encode(  ['info'=&gt; $ rows],
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1条回答 默认 最新

  • dongrendang6566 2018-03-07 16:17

    My first suggestion is to not publish your API key. Pixabay may be free, but sharing API keys on the internet will put you infrastructure in danger.

    Upon looking up the request it seems Pixabay is setting some headers that could affect your cache.

    Access-Control-Max-Age → 86400
    Cache-Control → max-age=86400
    Content-Type → application/json

    Check out the Android documentation on HttpResponseCache It outlines how you can force a cache response after setting up the HttpResponseCache.

         try {
             connection.addRequestProperty("Cache-Control", "only-if-cached");
             InputStream cached = connection.getInputStream();
             // the resource was cached! show it
         } catch (FileNotFoundException e) {
             // the resource was not cached
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