與JSON數據和Android的問題

我堅持這個問題。我試圖從MySQL數據庫中提取一些json數據。我目前想使用AsyncTask來完成後臺的大部分工作，並可能使用不同的php腳本來運行不同的查詢返回不同的數據（這就是爲什麼我沒有插入直接url到httpost中）與JSON數據和Android的問題

現在基本上現在，我想從數據庫中檢索數據，將其傳遞給一個變量，然後在TextView中顯示該變量。

當我運行代碼時，它只是在TextView中顯示「No Data」，所以有些東西不起作用。我的PHP文件工作正常！繼承人的代碼：任何幫助非常感謝:)

package com.example.test1; 



import java.io.BufferedReader; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.util.ArrayList; 

import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.NameValuePair; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.entity.UrlEncodedFormEntity; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.app.Activity; 
import android.net.ParseException; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.util.Log; 
import android.widget.TextView; 

public class clubpage extends Activity { 

TextView test; 
String clubphp = "http://10.0.2.2/corkgaa/Nemo.php"; 
String event = "No Data"; 
String name = "No Data"; 
String price = "No Data"; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.clubpage); 

    test = (TextView)findViewById(R.id.clubinfo); 

    new Dbhandler().execute(clubphp); 

    test.setText(name);  

} 

public class Dbhandler extends AsyncTask<String, Void, String> { 

    @Override 
    protected String doInBackground(String... arg0) { 
     // TODO Auto-generated method stub 
     JSONArray jArray; 
     String result = "no response"; 
     InputStream is = null; 
     StringBuilder sb = null; 

     ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); 
     //http post 
     try{ 
      HttpClient httpclient = new DefaultHttpClient(); 
      HttpPost httppost = new HttpPost("clubphp"); 
      httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); 
      HttpResponse response = httpclient.execute(httppost); 
      HttpEntity entity = response.getEntity(); 
      is = entity.getContent(); 
      } 
     catch(Exception e){ 
       Log.e("log_tag", "Error in http connection"+e.toString()); 
      } 

     //convert response to string 
     try{ 
      BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8); 
      sb = new StringBuilder(); 
      sb.append(reader.readLine() + "\n"); 
      String line="0"; 
      while ((line = reader.readLine()) != null) { 
       sb.append(line + "\n"); 
       } 
      is.close(); 
      result=sb.toString(); 
      } 
     catch(Exception e){ 
      Log.e("log_tag", "Error converting result "+e.toString()); 
      } 

     //parsing data 

     try{ 
      jArray = new JSONArray(result); 
     JSONObject json_data=null; 

     for(int i=0;i<jArray.length();i++){ 
      json_data = jArray.getJSONObject(i); 
      name=json_data.getString("NAME"); 
      event=json_data.getString("EVENT"); 
      price=json_data.getString("PRICE"); 
      } 
     } 
     catch(JSONException e1){ 

      } 
     catch (ParseException e1) { 
      e1.printStackTrace(); 
      } 
     return name; 
    } 

} 

@Override 
protected void onPause() { 
    // TODO Auto-generated method stub 
    super.onPause(); 
}

}

登錄貓：

03-04 15:25:35.139: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.149: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.239: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.259: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.259: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.270: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.279: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.279: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.312: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.312: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.349: I/ActivityManager(288): START u0 {cmp=com.example.test1/.clubpage} from pid 791 
03-04 15:25:35.369: W/WindowManager(288): Failure taking screenshot for (246x410) to layer 21020 
03-04 15:25:35.389: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.419: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.429: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.438: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.459: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.479: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.479: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.479: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.588: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.588: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.609: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.028: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.099: I/Choreographer(791): Skipped 31 frames! The application may be doing too much work on its main thread. 
03-04 15:25:36.109: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.168: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.268: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.279: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.279: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.289: V/PhoneStatusBar(580): setLightsOn(true) 
03-04 15:25:36.299: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.358: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.409: E/SurfaceFlinger(36): ro.sf.lcd_density must be defined as a build property 
03-04 15:25:36.409: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.421: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.439: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.439: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.439: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.729: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.729: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.773: I/Choreographer(791): Skipped 158 frames! The application may be doing too much work on its main thread. 
03-04 15:25:36.779: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.779: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.209: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.209: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.240: I/ActivityManager(288): Displayed com.example.test1/.clubpage: +1s832ms 
03-04 15:25:37.269: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.269: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.299: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.309: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.331: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.399: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.589: I/Choreographer(791): Skipped 48 frames! The application may be doing too much work on its main thread. 
03-04 15:25:37.649: D/dalvikvm(288): GC_CONCURRENT freed 980K, 35% free 7576K/11552K, paused 9ms+56ms, total 701ms 
03-04 15:25:37.859: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.859: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.911: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.911: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.919: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.949: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.214: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.250: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.250: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.309: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.369: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.409: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.419: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.439: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.479: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.519: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.530: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.530: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.549: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.549: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.549: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.549: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.629: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.629: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.690: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.699: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.699: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.719: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.739: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.759: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0

來源

2013-03-04 sean_2013

你需要一個onPostExecute()方法添加到您的Dbhandler類，並設置TextView的文本在該方法中的值：

public class Dbhandler extends AsyncTask<String, Void, String> { 
    @Override 
    protected String doInBackground(String... arg0) { 
     [...] 
     return name; 
    } 

    @Override 
    protected void onPostExecute(String newName) { 
     test.setText(newName); 
    } 
}

來源

2013-03-04 02:15:33 acj

HttpPost httppost = new HttpP OST（「clubphp」）;

只是用下面的代碼替換這行

HttpPost httppost =新HttpPost（爲arg0 [0]）;

和

落實後執行如下

@Override 
    protected void onPostExecute(String resultName) { 
     test.setText(resultName); 
    }

希望它會工作只是張貼日誌貓還在這兒，如果你發現任何問題

來源

2013-03-04 09:44:21

感謝您的幫助，但不幸的是它仍然沒有返回我想要的，仍然返回「無數據」我已經在我的問題上面張貼了日誌貓。乾杯:) – 2013-03-04 18:52:24

嘗試更換您的10.0.2.2您的系統IP地址並添加一個日誌，在返回名稱之前打印該名稱。在doInbackground知道您的系統的IP地址在命令提示符下執行ipconfig

來源

2013-04-28 07:44:37

與JSON數據和Android的問題

回答

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