Question

我想构建一个简单的应用程序，它将从远程数据库中获取记录并存储一些记录我使用php-mysql-apache（wamp），我的php文件是

    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org  /TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    <meta http-equiv="Content-Type" content="application/json; charset=utf-8" />
    <title>Untitled Document</title>
    </head>

    <body>

    <?php
    $link = mysql_connect('localhost', 'root', ''); 
       if (!$link) {
       die('Not connected : ' . mysql_error()); 
    }

    mysql_query("SET NAMES 'greek'", $link); 

    $db_selected = mysql_select_db('products', $link); 
    if (!$db_selected) {
      die ('Can\'t use roflcopter: ' . mysql_error());
    }

    $id = $_GET['id']; 

    $sql = "SELECT * FROM `items` WHERE `id` = ".$id. " ORDER BY  `id` ASC";           
    $result = mysql_query($sql); 

    if (!$result) {                 
        $message  = 'Invalid query: ' . mysql_error() . "\n";
        // $message .= 'Whole query: ' . $query;
        die($message);
    }

     $json = NULL;

      while ($data_array[] = mysql_fetch_assoc($result)){ 

     $json = json_encode($data_array); 
     }

     echo $json; 

     ?>
     </body> 
     </html>

我从浏览器运行时的响应是

   [{"id":"1590774","name":"Nokia C7","descr":"????. ??????? Symbian 3, ????? 3,5\", 360 ? 640 pixels, Amoled, Capacitive ?????\/???????? 8GB","price":"339","stock":"3"}]

（它不承认希腊字符 - 我该怎么办？）

我应该在eclipse上编写什么代码才能获取并显示该行？

其实我正在尝试使用互联网上的项目作为获取此json数组的示例

      http://api.androidhive.info/contacts/

并且android项目包含3个java活动：

            public class AndroidJSONParsingActivity extends ListActivity {

        // url to make request
        private static String url = "http://api.androidhive.info/contacts/";

        // JSON Node names
        private static final String TAG_CONTACTS = "contacts";
        private static final String TAG_ID = "id";
        private static final String TAG_NAME = "name";
        private static final String TAG_EMAIL = "email";
        private static final String TAG_ADDRESS = "address";
        private static final String TAG_GENDER = "gender";
        private static final String TAG_PHONE = "phone";
        private static final String TAG_PHONE_MOBILE = "mobile";
        private static final String TAG_PHONE_HOME = "home";
        private static final String TAG_PHONE_OFFICE = "office";

        // contacts JSONArray
        JSONArray contacts = null;

        @Override
        public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);

    // Hashmap for ListView
    ArrayList<HashMap<String, String>> contactList = new       ArrayList<HashMap<String, String>>();

    // Creating JSON Parser instance
    JSONParser jParser = new JSONParser();

    // getting JSON string from URL
    JSONObject json = jParser.getJSONFromUrl(url);

    try {
        // Getting Array of Contacts
        contacts = json.getJSONArray(TAG_CONTACTS);

        // looping through All Contacts
        for(int i = 0; i < contacts.length(); i++){
            JSONObject c = contacts.getJSONObject(i);

            // Storing each json item in variable
            String id = c.getString(TAG_ID);
            String name = c.getString(TAG_NAME);
            String email = c.getString(TAG_EMAIL);
            String address = c.getString(TAG_ADDRESS);
            String gender = c.getString(TAG_GENDER);

            // Phone number is agin JSON Object
            JSONObject phone = c.getJSONObject(TAG_PHONE);
            String mobile = phone.getString(TAG_PHONE_MOBILE);
            String home = phone.getString(TAG_PHONE_HOME);
            String office = phone.getString(TAG_PHONE_OFFICE);

            // creating new HashMap
            HashMap<String, String> map = new HashMap<String,String>();

            // adding each child node to HashMap key => value
            map.put(TAG_ID, id);
            map.put(TAG_NAME, name);
            map.put(TAG_EMAIL, email);
            map.put(TAG_PHONE_MOBILE, mobile);

            // adding HashList to ArrayList
            contactList.add(map);
        }
    } catch (JSONException e) {
        e.printStackTrace();
    }


    /**
     * Updating parsed JSON data into ListView
     * */
    ListAdapter adapter = new SimpleAdapter(this, contactList,
            R.layout.list_item,
            new String[] { TAG_NAME, TAG_EMAIL, TAG_PHONE_MOBILE }, new int[] {
                    R.id.name, R.id.email, R.id.mobile });

    setListAdapter(adapter);

    // selecting single ListView item
    ListView lv = getListView();

    // Launching new screen on Selecting Single ListItem
    lv.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            // getting values from selected ListItem
            String name = ((TextView) view.findViewById(R.id.name)).getText().toString();
            String cost = ((TextView) view.findViewById(R.id.email)).getText().toString();
            String description = ((TextView) view.findViewById(R.id.mobile)).getText().toString();

            // Starting new intent
            Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
            in.putExtra(TAG_NAME, name);
            in.putExtra(TAG_EMAIL, cost);
            in.putExtra(TAG_PHONE_MOBILE, description);
            startActivity(in);

        }
    });



}

}

第二项活动是Json Parser：

    public class JSONParser {

static InputStream is = null;
static JSONObject jObj = null;
static String json = "";

// constructor
public JSONParser() {

}

public JSONObject getJSONFromUrl(String url) {

    // Making HTTP request
    try {
        // defaultHttpClient
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);

        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        is = httpEntity.getContent();           

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        is.close();
        json = sb.toString();
    } catch (Exception e) {
        Log.e("Buffer Error", "Error converting result " + e.toString());
    }

    // try parse the string to a JSON object
    try {
        jObj = new JSONObject(json);
    } catch (JSONException e) {
        Log.e("JSON Parser", "Error parsing data " + e.toString());
    }

    // return JSON String
    return jObj;

}

}

，第三个用于向listview显示结果

    public class SingleMenuItemActivity  extends Activity {

// JSON node keys
private static final String TAG_NAME = "name";
private static final String TAG_EMAIL = "email";
private static final String TAG_PHONE_MOBILE = "mobile";
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.single_list_item);

    // getting intent data
    Intent in = getIntent();

    // Get JSON values from previous intent
    String name = in.getStringExtra(TAG_NAME);
    String cost = in.getStringExtra(TAG_EMAIL);
    String description = in.getStringExtra(TAG_PHONE_MOBILE);

    // Displaying all values on the screen
    TextView lblName = (TextView) findViewById(R.id.name_label);
    TextView lblCost = (TextView) findViewById(R.id.email_label);
    TextView lblDesc = (TextView) findViewById(R.id.mobile_label);

    lblName.setText(name);
    lblCost.setText(cost);
    lblDesc.setText(description);
}

}

我试图更改此示例以将其调整为我的json响应，我首先意识到我的json数组没有任何标记，例如示例的“contacts”标记，以便在示例中使用它 contacts = json.getJSONArray（TAG_CONTACTS）;

另一件事是，对于我的应用程序，我需要发送一个参数来获取特定id的数据我有一个字段表：id，name，desciption，price，stock 我试试我的网址 “HTTP：//localhost/items.php ID = 1590774” 要么 “http：//localhost/items.php”

以这种方式传递参数

ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("id","1590774"));

我是一个初学者，所以我很感激你的帮助...

Answer 1

您应该尝试在DefaultHttpClient实例中添加一个参数，以便使用字符集：

...
HttpParams params = new BasicHttpParams();
params.setParameter(CoreProtocolPNames.HTTP_CONTENT_CHARSET, HTTP.UTF_8);
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient(params);
...

如果HTTP.UTF_8不起作用，您可以从HTTP班级中选择合适的值。如果这不能解决问题，请附加一些logcat输出。

如何在Android应用程序中解析这个Json？

1 个答案: