Php 如何更改Android代码以处理MySQL数据库中的两个JSON

我是android开发的新手，一直在努力理解这段代码，但我仍然需要一些帮助来理解JSON是如何处理的。不仅如此，我还想用它做一些稍微不同的事情，并且想知道如何更改此代码来实现它

在我现有的PHP代码中，我查询一个MySQL数据库并生成一个JSON数组：

    echo json_encode($rows1);

看起来是这样的：

    [
    {"id":"6","rating":"5","created":"2012-11-29 00:00:00"},
    {"id":"2","rating":"5","created":"2013-11-19 00:00:00"},
    {"id":"8","rating":"4","created":"2013-06-16 00:00:00"},
    {"id":"3","rating":"4","created":"2013-11-05 00:00:00"},
    {"id":"10","rating":"3","created":"2012-12-05 00:00:00"},
    {"id":"7","rating":"3","created":"2013-08-02 00:00:00"},
    {"id":"4","rating":"3","created":"2013-08-12 00:00:00"},
    {"id":"9","rating":"2","created":"2013-10-03 00:00:00"}
]

    public class FetchDataTask extends AsyncTask<String, Void, String>{
    private final FetchDataListener listener;
    private String msg;

    public FetchDataTask(FetchDataListener listener) {
        this.listener = listener;
    }

    @Override
    protected String doInBackground(String... params) {
        if(params == null) return null;

        // get url from params
        String url = params[0];

        try {
            // create http connection
            HttpClient client = new DefaultHttpClient();
            HttpGet httpget = new HttpGet(url);

            // connect
            HttpResponse response = client.execute(httpget);

            // get response
            HttpEntity entity = response.getEntity();

            if(entity == null) {
                msg = "No response from server";
                return null;        
            }


            // get response content and convert it to json string
            InputStream is = entity.getContent();
            return streamToString(is);
        }
        catch(IOException e){
            msg = "No Network Connection";
        }

        return null;
    }

    @Override
    protected void onPostExecute(String sJson) {
        if(sJson == null) {
            if(listener != null) listener.onFetchFailure(msg);
            return;
        }        

        try {
            // convert json string to json array
            JSONArray aJson = new JSONArray(sJson);
            // create apps list
            List<Application> apps = new ArrayList<Application>();

            for(int i=0; i<aJson.length(); i++) {
                JSONObject json = aJson.getJSONObject(i);
                Application app = new Application();
                SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
                SimpleDateFormat sdf1=new SimpleDateFormat("MMM dd yyyy hh:mm:ss");
                app.setCreated(sdf1.format(sdf.parse(json.getString("created"))));
                app.setRank(json.getString("rating"));  
                // add the app to apps list
                apps.add(app);
            }

            //notify the activity that fetch data has been complete
            if(listener != null) listener.onFetchComplete(apps);
        } catch (JSONException e) {
            msg = "Invalid response";
            if(listener != null) listener.onFetchFailure(msg);
            return;
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }        
    }

    /**
     * This function will convert response stream into json string
     * @param is respons string
     * @return json string
     * @throws IOException
     */
    public String streamToString(final InputStream is) throws IOException{
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder(); 
        String line = null;

        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
        } 
        catch (IOException e) {
            throw e;
        } 
        finally {           
            try {
                is.close();
            } 
            catch (IOException e) {
                throw e;
            }
        }

        return sb.toString();
    }
}

echo json_encode($rows1);
echo json_encode($rows2);

    [
    {"id":"6","rating":"5","created":"2012-11-29 00:00:00"},
    {"id":"2","rating":"5","created":"2013-11-19 00:00:00"},
    {"id":"8","rating":"4","created":"2013-06-16 00:00:00"},
    {"id":"3","rating":"4","created":"2013-11-05 00:00:00"},
    {"id":"10","rating":"3","created":"2012-12-05 00:00:00"},
    {"id":"7","rating":"3","created":"2013-08-02 00:00:00"},
    {"id":"4","rating":"3","created":"2013-08-12 00:00:00"},
    {"id":"9","rating":"2","created":"2013-10-03 00:00:00"}
]

[
    {"id":"5","rating":"4","created":"2014-02-11 00:00:00"}
]

我的android代码如下所示：

    [
    {"id":"6","rating":"5","created":"2012-11-29 00:00:00"},
    {"id":"2","rating":"5","created":"2013-11-19 00:00:00"},
    {"id":"8","rating":"4","created":"2013-06-16 00:00:00"},
    {"id":"3","rating":"4","created":"2013-11-05 00:00:00"},
    {"id":"10","rating":"3","created":"2012-12-05 00:00:00"},
    {"id":"7","rating":"3","created":"2013-08-02 00:00:00"},
    {"id":"4","rating":"3","created":"2013-08-12 00:00:00"},
    {"id":"9","rating":"2","created":"2013-10-03 00:00:00"}
]

    public class FetchDataTask extends AsyncTask<String, Void, String>{
    private final FetchDataListener listener;
    private String msg;

    public FetchDataTask(FetchDataListener listener) {
        this.listener = listener;
    }

    @Override
    protected String doInBackground(String... params) {
        if(params == null) return null;

        // get url from params
        String url = params[0];

        try {
            // create http connection
            HttpClient client = new DefaultHttpClient();
            HttpGet httpget = new HttpGet(url);

            // connect
            HttpResponse response = client.execute(httpget);

            // get response
            HttpEntity entity = response.getEntity();

            if(entity == null) {
                msg = "No response from server";
                return null;        
            }


            // get response content and convert it to json string
            InputStream is = entity.getContent();
            return streamToString(is);
        }
        catch(IOException e){
            msg = "No Network Connection";
        }

        return null;
    }

    @Override
    protected void onPostExecute(String sJson) {
        if(sJson == null) {
            if(listener != null) listener.onFetchFailure(msg);
            return;
        }        

        try {
            // convert json string to json array
            JSONArray aJson = new JSONArray(sJson);
            // create apps list
            List<Application> apps = new ArrayList<Application>();

            for(int i=0; i<aJson.length(); i++) {
                JSONObject json = aJson.getJSONObject(i);
                Application app = new Application();
                SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
                SimpleDateFormat sdf1=new SimpleDateFormat("MMM dd yyyy hh:mm:ss");
                app.setCreated(sdf1.format(sdf.parse(json.getString("created"))));
                app.setRank(json.getString("rating"));  
                // add the app to apps list
                apps.add(app);
            }

            //notify the activity that fetch data has been complete
            if(listener != null) listener.onFetchComplete(apps);
        } catch (JSONException e) {
            msg = "Invalid response";
            if(listener != null) listener.onFetchFailure(msg);
            return;
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }        
    }

    /**
     * This function will convert response stream into json string
     * @param is respons string
     * @return json string
     * @throws IOException
     */
    public String streamToString(final InputStream is) throws IOException{
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder(); 
        String line = null;

        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
        } 
        catch (IOException e) {
            throw e;
        } 
        finally {           
            try {
                is.close();
            } 
            catch (IOException e) {
                throw e;
            }
        }

        return sb.toString();
    }
}

echo json_encode($rows1);
echo json_encode($rows2);

    [
    {"id":"6","rating":"5","created":"2012-11-29 00:00:00"},
    {"id":"2","rating":"5","created":"2013-11-19 00:00:00"},
    {"id":"8","rating":"4","created":"2013-06-16 00:00:00"},
    {"id":"3","rating":"4","created":"2013-11-05 00:00:00"},
    {"id":"10","rating":"3","created":"2012-12-05 00:00:00"},
    {"id":"7","rating":"3","created":"2013-08-02 00:00:00"},
    {"id":"4","rating":"3","created":"2013-08-12 00:00:00"},
    {"id":"9","rating":"2","created":"2013-10-03 00:00:00"}
]

[
    {"id":"5","rating":"4","created":"2014-02-11 00:00:00"}
]

看起来是这样的：

    [
    {"id":"6","rating":"5","created":"2012-11-29 00:00:00"},
    {"id":"2","rating":"5","created":"2013-11-19 00:00:00"},
    {"id":"8","rating":"4","created":"2013-06-16 00:00:00"},
    {"id":"3","rating":"4","created":"2013-11-05 00:00:00"},
    {"id":"10","rating":"3","created":"2012-12-05 00:00:00"},
    {"id":"7","rating":"3","created":"2013-08-02 00:00:00"},
    {"id":"4","rating":"3","created":"2013-08-12 00:00:00"},
    {"id":"9","rating":"2","created":"2013-10-03 00:00:00"}
]

    public class FetchDataTask extends AsyncTask<String, Void, String>{
    private final FetchDataListener listener;
    private String msg;

    public FetchDataTask(FetchDataListener listener) {
        this.listener = listener;
    }

    @Override
    protected String doInBackground(String... params) {
        if(params == null) return null;

        // get url from params
        String url = params[0];

        try {
            // create http connection
            HttpClient client = new DefaultHttpClient();
            HttpGet httpget = new HttpGet(url);

            // connect
            HttpResponse response = client.execute(httpget);

            // get response
            HttpEntity entity = response.getEntity();

            if(entity == null) {
                msg = "No response from server";
                return null;        
            }


            // get response content and convert it to json string
            InputStream is = entity.getContent();
            return streamToString(is);
        }
        catch(IOException e){
            msg = "No Network Connection";
        }

        return null;
    }

    @Override
    protected void onPostExecute(String sJson) {
        if(sJson == null) {
            if(listener != null) listener.onFetchFailure(msg);
            return;
        }        

        try {
            // convert json string to json array
            JSONArray aJson = new JSONArray(sJson);
            // create apps list
            List<Application> apps = new ArrayList<Application>();

            for(int i=0; i<aJson.length(); i++) {
                JSONObject json = aJson.getJSONObject(i);
                Application app = new Application();
                SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
                SimpleDateFormat sdf1=new SimpleDateFormat("MMM dd yyyy hh:mm:ss");
                app.setCreated(sdf1.format(sdf.parse(json.getString("created"))));
                app.setRank(json.getString("rating"));  
                // add the app to apps list
                apps.add(app);
            }

            //notify the activity that fetch data has been complete
            if(listener != null) listener.onFetchComplete(apps);
        } catch (JSONException e) {
            msg = "Invalid response";
            if(listener != null) listener.onFetchFailure(msg);
            return;
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }        
    }

    /**
     * This function will convert response stream into json string
     * @param is respons string
     * @return json string
     * @throws IOException
     */
    public String streamToString(final InputStream is) throws IOException{
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder(); 
        String line = null;

        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
        } 
        catch (IOException e) {
            throw e;
        } 
        finally {           
            try {
                is.close();
            } 
            catch (IOException e) {
                throw e;
            }
        }

        return sb.toString();
    }
}

echo json_encode($rows1);
echo json_encode($rows2);

    [
    {"id":"6","rating":"5","created":"2012-11-29 00:00:00"},
    {"id":"2","rating":"5","created":"2013-11-19 00:00:00"},
    {"id":"8","rating":"4","created":"2013-06-16 00:00:00"},
    {"id":"3","rating":"4","created":"2013-11-05 00:00:00"},
    {"id":"10","rating":"3","created":"2012-12-05 00:00:00"},
    {"id":"7","rating":"3","created":"2013-08-02 00:00:00"},
    {"id":"4","rating":"3","created":"2013-08-12 00:00:00"},
    {"id":"9","rating":"2","created":"2013-10-03 00:00:00"}
]

[
    {"id":"5","rating":"4","created":"2014-02-11 00:00:00"}
]

---

如何更改android代码我必须处理两个数组。我的目标是用原始$rows1数组填充Listview，用$rows2填充另一个布局？

而不是一次打印两个json字符串尝试将这两个数组转换为单个数组，然后像下面那样打印json字符串

$result=数组（$rows1，$rows2）

---

echo json_编码（$result）

您可以将两个

jsonarray

添加到单个

Jsonobject

中，并将单个Json对象从服务器发送到android，而android将只发送一个

echo json_encode($rows);

---

解决方案非常简单。您可以执行以下任一操作：

• 对于每行提取，可以使用不同的参数url调用FetchDataTask
• 您可以将FetchDataTask

  doInBackground

  更改为循环遍历一个参数数组，您可以为每一行提供该数组，然后获取这些行。e、 g

  row1Url=params[0]，row2Url=params[1]…

  然后返回一个字符串结果数组，在您的

  onPostExecute

  中循环它们，并填充各自的布局

异步任务的代码取决于布局。你应该考虑使它更可重用。