Json Array ist null, während JSONObject den Wert

Question

ich die Daten von PHP retriving json auf Android zu verwenden, wenn myjson Zeichenfolge retriving alle Werte von PHP hat, wenn ich benutze

array= j.getJSONArray("result"); 

j das erste Array-Element hat aber mein Array ist null. Plz jemand sagen Sie mir die genaue Grund für diese

public void getData() { 
     class GetDataJSON extends AsyncTask<String, Void, String> { 

      @Override 
      protected String doInBackground(String... params) { 
       DefaultHttpClient httpclient = new DefaultHttpClient(new BasicHttpParams()); 
       HttpPost httppost = new HttpPost("http://futuroitsolutions.in/php_android_api/data1.php"); 

       // Depends on your web service 
       httppost.setHeader("Content-type", "application/json"); 

       InputStream inputStream = null; 
       String result = null; 
       try { 
        HttpResponse response = httpclient.execute(httppost); 
        HttpEntity entity = response.getEntity(); 

        inputStream = entity.getContent(); 
        // json is UTF-8 by default 
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8); 
        StringBuilder sb = new StringBuilder(); 

        String line = null; 
        while ((line = reader.readLine()) != null) { 
         sb.append(line + "\n"); 
        } 
        result = sb.toString(); 
       } catch (Exception e) { 
        // Oops 
       } finally { 
        try { 
         if (inputStream != null) inputStream.close(); 
        } catch (Exception squish) { 
        } 
       } 
       return result; 
      } 

      @Override 
      protected void onPostExecute(String result) { 
       myJSON = result; 
       ShowList(); 
      } 
     } 
     GetDataJSON g = new GetDataJSON(); 
     g.execute(); 

    } 
public void ShowList() { 
try { 

    String vi=myJSON; 
    vi=vi.replace('[',' ').replace(']',' '); 
     JSONObject j = new JSONObject(vi); 
     array= j.getJSONArray("result"); 
     try { 


     for(int i=0;i<array.length();i++){ 
      JSONObject c = array.getJSONObject(i); 
      id = c.getString(TAG_ID); 
      name = c.getString(TAG_NAME); 
      km = c.getString(TAG_KILOMETER); 
      time = c.getString(TAG_TIMING); 
      // get your data from jsonobject 
     } 
    } catch (JSONException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 

     // String regno = c.getString(TAG_REG); 
     // String phone = c.getString(TAG_PHONE); 
     // String category = c.getString(TAG_CAT); 

    } 

     catch (JSONException e) { 
      e.printStackTrace(); 
     } 
    TableLayout tv = (TableLayout) findViewById(R.id.table); 
     tv.removeAllViewsInLayout(); 
     int flag = 1; 
    int c=array.length(); 
     for (int i = 0; i < c ; i++) { 
     TableRow tr = new TableRow(MainActivity.this); 
     tr.setLayoutParams(new LayoutParams(
       LayoutParams.FILL_PARENT, 
       LayoutParams.WRAP_CONTENT)); 
     if (flag == 1) { 
      TextView b6 = new TextView(MainActivity.this); 
      b6.setText("Id"); 
      b6.setTextColor(Color.BLUE); 
      b6.setTextSize(15); 
      tr.addView(b6); 
      TextView b19 = new TextView(MainActivity.this); 
      b19.setPadding(10, 0, 0, 0); 
      b19.setTextSize(15); 
      b19.setText("Task name"); 
      b19.setTextColor(Color.BLUE); 
      tr.addView(b19); 
      TextView b29 = new TextView(MainActivity.this); 
      b29.setPadding(10, 0, 0, 0); 
      b29.setText("Timing"); 
      b29.setTextColor(Color.BLUE); 
      b29.setTextSize(15); 
      tr.addView(b29); 
      tv.addView(tr); 
      TextView b21 = new TextView(MainActivity.this); 
      b29.setPadding(10, 0, 0, 0); 
      b29.setText("Kilometers"); 
      b29.setTextColor(Color.BLUE); 
      b29.setTextSize(15); 
      tr.addView(b21); 
      tv.addView(tr); 

      final View vline = new View(MainActivity.this); 
      vline.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.FILL_PARENT, 2)); 
      vline.setBackgroundColor(Color.BLUE); 
      tv.addView(vline); 
      flag = 0; 
     } else { 
      //JSONObject json_data = jArray.getJSONObject(i); 
      // Log.i("log_tag", "id: " + json_data.getInt("Id") + ", Username: " + json_data.getString("Task name") + ", No: " + json_data.getString("Kilometers")); 
      TextView b = new TextView(MainActivity.this); 
      String stime =id; 
      b.setText(stime); 
      b.setTextColor(Color.RED); 
      b.setTextSize(15); 
      tr.addView(b); 
      TextView b1 = new TextView(MainActivity.this); 
      b1.setPadding(10, 0, 0, 0); 
      b1.setTextSize(15); 
      String stime1 = name; 
      b1.setText(stime1); 
      b1.setTextColor(Color.BLACK); 
      tr.addView(b1); 
      TextView b2 = new TextView(MainActivity.this); 
      b2.setPadding(10, 0, 0, 0); 
      String stime2 = time; 
      b2.setText(stime2); 
      b2.setTextColor(Color.BLACK); 
      b2.setTextSize(15); 
      tr.addView(b2); 
      tv.addView(tr); 
      TextView b3 = new TextView(MainActivity.this); 
      b2.setPadding(10, 0, 0, 0); 
      String stime3 = km; 
      b2.setText(stime3); 
      b2.setTextColor(Color.BLACK); 
      b2.setTextSize(15); 
      tr.addView(b2); 
      tv.addView(tr); 
      final View vline1 = new View(MainActivity.this); 
      vline1.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.FILL_PARENT, 1)); 
      vline1.setBackgroundColor(Color.WHITE); 
      tv.addView(vline1); 
     } 
    } 
} 

}

wenn ich debuggen, bekomme ich

vi= 
{"id":"1","Taskname":"edapally to kakkanad","SourceLa":"10.0236761","SourceLo":"76.311623","Path1La":"10.0327153","Path1Lo":"76.331889","Path2La":"10.0231412","Path2Lo":"76.3409954","DestinationLa":"10.0158605","DestinationLo":"76.3418666","Timing":"10 a.m","Kilometer":"8"} 

j={"id":"1","Taskname":"edapally to kakkanad","SourceLa":"10.0236761","SourceLo":"76.311623","Path1La":"10.0327153","Path1Lo":"76.331889","Path2La":"10.0231412","Path2Lo":"76.3409954","DestinationLa":"10.0158605","DestinationLo":"76.3418666","Timing":"10 a.m","Kilometer":"8"} 

Array = null meine Json

[{“ id ":" 1 "," Aufgabenname ":" edapally to kakkanad "," SourceLa ":" 10.0236761 "," SourceLo ":" 76.311623 "," Path1La ":" 10.032715 3 "," Path1Lo ":" 76.331889 "," Path2La ":" 10.0231412 "," Path2Lo ":" 76.3409954 "," DestinationLa ":" 10.0158605 "," DestinationLo ":" 76.3418666 "," Timing ":" 10 Uhr morgens “, "Kilometer": "8"}]

Data1.php

<?php 
    include('sql.php'); 

    mysql_query('SET CHARACTER SET utf8') ; 

     $result = mysql_query('SELECT * FROM Location') or    die(mysql_error()); 

     while($row = mysql_fetch_assoc($result)) 
     { 

     $rows[] = $row; 

    } 

     $final=array("result"=>$rows); 

     echo json_encode($rows); 
    ?> 

Answer 1

Sie haben keine Variable $ Reihen außerhalb der while-Schleife definiert. Deshalb ist der Umfang von $ rows nicht definiert.

<?php 
include('sql.php'); 
mysql_query('SET CHARACTER SET utf8') ; 
$rows=array(); 
$result = mysql_query('SELECT * FROM Location') or die(mysql_error()); 
while($row = mysql_fetch_assoc($result)) 
{ 
    $rows[] = $row; 
} 
$final=array("result"=>$rows); 
echo json_encode($rows); 

Answer 2

Versuchen Sie es stattdessen.

String vi=myJSON; 
JSONArray array = new JSONArray(vi); 

Answer 3

Sie können den Code unten versuchen:

JSONArray jsonArray = new JSONArray(vi); 
        for(int k = 0; k < jsonArray.length(); k++) 
        { 
         JSONObject jsonObject = jsonArray.getJSONObject(k); 

         jsonObject.getString("id"); 
         jsonObject.getString("Taskname"); 

         ............. 
         // parse all fields like above 
        }