從Android工作室發送數據到php

Question

我知道這個問題已經接近幾次了。但它總是使用Apache，這已被棄用。 我想從我的應用程序發送數據到我的數據庫。我知道我的PHP代碼有效。但是當我點擊「發送」在我的應用程序，它會崩潰應用程序或它的工作，但不會發送數據到我的數據庫（或者我只是看不到它）。

這是我叫我的班 「AddDataAsyncTask」：

btnnexttrip.setOnClickListener(new View.OnClickListener(){ 
     public void onClick (View view) { 
      Intent myIntent =new Intent(getBaseContext(), trip.class); 
      AddData =new AddDataAsyncTask(); 
      AddData.execute(); 

      startActivityForResult(myIntent,0); 
     } 
    }); 

我班AddDataAsyncTask：

private class AddDataAsyncTask extends AsyncTask<Void, Void, Void> { 

    @Override 
    protected void onPreExecute() { 
     Log.i("add", "onPreExecute"); 
     super.onPreExecute(); 
    } 

    protected Void doInBackground(Void... params) { 
     //I Use HashMap, it works similar to NameValuePair 
     Map<String,String> dataToSend = new HashMap<>(); 
     dataToSend.put("id",hisid); 
     dataToSend.put("name", hisname); 
     dataToSend.put("age", hisage); 
     dataToSend.put("job", hisjob); 
     dataToSend.put("gender", hisgender); 
     dataToSend.put("date_trip", hisdate); 
     dataToSend.put("mode_trip", hismode); 
     dataToSend.put("time_trip", histime); 
     dataToSend.put("crowded_trip", hiscrowded); 
     dataToSend.put("from_trip", hisfrom); 
     dataToSend.put("to_trip", histo); 
     dataToSend.put("majo_gender",hismajogender); 
     dataToSend.put("majo_origin",hismajoorigin); 

     String encodedStr = getEncodedData(dataToSend); 

     BufferedReader reader = null; 

     try { 
      URL url = new URL(urlAdd); 
      HttpURLConnection con = (HttpURLConnection) url.openConnection(); 

      con.setRequestMethod("POST"); 
      con.setDoOutput(true); 
      OutputStreamWriter writer = new OutputStreamWriter(con.getOutputStream()); 
      writer.write(encodedStr); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } finally { 
      if(reader != null) { 
       try { 
        reader.close(); 
       } catch (IOException e) { 
        e.printStackTrace(); 
       } 
      } 
     } 

     return null; 
    } 
    @Override 
    protected void onPostExecute(Void result) { 
     Log.i("add", "onPostExecute"); 
     super.onPostExecute(result); 
     if(success==1) 
     { 
      Toast.makeText(getApplicationContext(), "Good "+message, Toast.LENGTH_LONG).show(); 
     } 
     else 
     { 
      Toast.makeText(getApplicationContext(), "Error " +message, Toast.LENGTH_LONG).show(); 
     } 
    } 
} 

這似乎是 「getEncodedData」 中的 「doInBackground」 不工作：

private String getEncodedData(Map<String,String> data) { 
    StringBuilder sb = new StringBuilder(); 
    for(String key : data.keySet()) { 
     String value = null; 
     try { 
      value = URLEncoder.encode(data.get(key),"UTF-8"); 
     } catch (UnsupportedEncodingException e) { 
      e.printStackTrace(); 
     } 
     if(sb.length()>0){ 
      sb.append("&"); 
     } 
     sb.append(key + "=" + value); 
    } 
    return sb.toString(); 
} 

我有上網權限......這是logcat的：

05-25 10:59:00.675 2468-3214/com.example.jeremydiez.sharedlifetracks E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1 
                        Process: com.example.jeremydiez.sharedlifetracks, PID: 2468 
                        java.lang.RuntimeException: An error occurred while executing doInBackground() 
                         at android.os.AsyncTask$3.done(AsyncTask.java:325) 
                         at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354) 
                         at java.util.concurrent.FutureTask.setException(FutureTask.java:223) 
                         at java.util.concurrent.FutureTask.run(FutureTask.java:242) 
                         at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243) 
                         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133) 
                         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607) 
                         at java.lang.Thread.run(Thread.java:761) 
                        Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference 
                         at java.net.URLEncoder.encode(URLEncoder.java:205) 
                         at com.example.jeremydiez.sharedlifetracks.tripsecondpart.getEncodedData(tripsecondpart.java:198) 
                         at com.example.jeremydiez.sharedlifetracks.tripsecondpart.access$300(tripsecondpart.java:41) 
                         at com.example.jeremydiez.sharedlifetracks.tripsecondpart$AddDataAsyncTask.doInBackground(tripsecondpart.java:268) 
                         at com.example.jeremydiez.sharedlifetracks.tripsecondpart$AddDataAsyncTask.doInBackground(tripsecondpart.java:240) 
                         at android.os.AsyncTask$2.call(AsyncTask.java:305) 
                         at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
                         at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)  
                         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)  
                         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)  
                         at java.lang.Thread.run(Thread.java:761)  

我試圖修復它（與logcat的），所以我改變了「getEncodedData」這樣的：

private String getEncodedData(Map<String,String> data) { 
    StringBuilder sb = new StringBuilder(); 
    for(Map.Entry<String, String> entry : data.entrySet()) { 
     String key = entry.getKey(); 
     String value = entry.getValue(); 
     String encodedvalue = null; 
     try { 
      encodedvalue = URLEncoder.encode(key,"UTF-8"); 
     } catch (UnsupportedEncodingException e) { 
      e.printStackTrace(); 
     } 
     if(sb.length()>0){ 
      sb.append("&"); 
     } 
     sb.append(key + "=" + encodedvalue); 
    }  
    return sb.toString(); 
} 

有了這一個它沒有崩潰，但沒有送什麼東西給我的數據庫：/

有人可以幫我嗎？

編輯：這就是我如何定義我的urlAdd：

String urlAdd="http://192.168.15.32/enis_android_club/add_dbadd.php"; 

是它的好辦法做到這一點？

Answer 1

試試這個，它爲我工作 首先創建一個JSON解析器類，像這樣：

public class JSONParser { 

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

// constructor 
public JSONParser() { 

} 

// function get json from url 
// by making HTTP POST or GET mehtod 
public JSONObject makeHttpRequest(String url, String method, 
            List<NameValuePair> params) { 

    // Making HTTP request 
    try { 

     // check for request method 
     if (method == "POST") { 
      // request method is POST 
      // defaultHttpClient 
      DefaultHttpClient httpClient = new DefaultHttpClient(); 
      HttpPost httpPost = new HttpPost(url); 
      httpPost.setEntity(new UrlEncodedFormEntity(params)); 

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

     } else if (method == "GET") { 
      // request method is GET 
      DefaultHttpClient httpClient = new DefaultHttpClient(); 
      String paramString = URLEncodedUtils.format(params, "utf-8"); 
      url += "?" + paramString; 
      HttpGet httpGet = new HttpGet(url); 

      HttpResponse httpResponse = httpClient.execute(httpGet); 
      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; 

} 

}

而在你的doInBackground方法把這個代碼：

 protected String doInBackground(String... args) { 


     // Building Parameters 
     List<NameValuePair> params = new ArrayList<>(); 
     params.add(new BasicNameValuePair(("id",hisid))); 
     params.add(new BasicNameValuePair("name", hisname)); // put your values like this 
     Log.e("params", params.toString()); 

     // getting JSON Object 
          final JSONObject jsonValid = jsonParser.makeHttpRequest(
            urlAdd, "POST", params); 

          int successValid = jsonValid.getInt("success"); 

          if (successValid == 1) { 
           runOnUiThread(new Runnable() { 

            @Override 
            public void run() { 
             Toast.makeText(getApplicationContext(), "success", Toast.LENGTH_SHORT).show(); 
            } 
           }); 
          } else { 
           runOnUiThread(new Runnable() { 

            @Override 
            public void run() { 
             Toast.makeText(getApplicationContext(), "Error", 
               Toast.LENGTH_SHORT).show(); 
            } 
           }); 
          } 
          } 

我沒有組織好這個代碼，試着組織它:)