如何在android中訪問在線數據庫？

我正在製作一個應用程序，由用戶提交註冊表單並將表單數據更新到遠程服務器上維護的數據庫中。如何在android中訪問在線數據庫？

我正在使用本地主機作爲服務器。我的應用程序在模擬器上測試時工作正常。但是，當我運行我的手機上有不同的互聯網連接的應用程序，應用程序工作正常，沒有錯誤，但我的本地主機上的數據庫不更新。

請按照下面的代碼。

MainActivity.java

package com.mits_form; 

import java.util.ArrayList; 
import java.util.List; 

import org.apache.http.NameValuePair; 
import org.apache.http.message.BasicNameValuePair; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.app.Activity; 
import android.app.ProgressDialog; 
import android.content.Intent; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Toast; 

public class MainActivity extends Activity { 

// Progress Dialog 
private ProgressDialog pDialog; 

JSONParser jsonParser = new JSONParser(); 
EditText inputName; 
EditText inputPrice; 
EditText inputDesc; 

// url to create new product 
private static String urlcreateproduct = "http://192.168.1.145/androidconnect/createproduct.php"; 

// JSON Node names 
private static final String TAG_SUCCESS = "success"; 

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

    pDialog = new ProgressDialog(this); 
    pDialog.setMessage("Creating Product.."); 
    pDialog.setIndeterminate(false); 
    pDialog.setCancelable(true); 

    // Edit Text 
    inputName = (EditText) findViewById(R.id.editText1); 
    inputPrice = (EditText) findViewById(R.id.editText2); 
    inputDesc = (EditText) findViewById(R.id.editText3); 

    // Create button 

    try 
    { 
    Button btnCreateProduct = (Button) findViewById(R.id.button); 

    // button click event 

    btnCreateProduct.setOnClickListener(new View.OnClickListener() 
    { 

     @Override 
     public void onClick(View view) { 
      // creating new product in background thread 
      new CreateNewProduct().execute(); 
     } 
    }); 
    } 
    catch(Exception ex) 
    { 
     Log.e("MITS FORM", ex.toString()); 
    } 

} 
    // Background Async Task to Create new product 

    class CreateNewProduct extends AsyncTask<String, String, String> { 

    /** 
    * Before starting background thread Show Progress Dialog 
    * */ 
    @Override 
    protected void onPreExecute() 
    { 
/* 
     pDialog = new ProgressDialog(MainActivity.this); 
     pDialog.setMessage("Creating Product.."); 
     pDialog.setIndeterminate(false); 
     pDialog.setCancelable(true);*/ 
     pDialog.show(); 
    } 

    /** 
    * Creating product 
    * */ 
    protected String doInBackground(String... args) { 
     try{ 
     String name = inputName.getText().toString(); 
     String price = inputPrice.getText().toString(); 
     String description = inputDesc.getText().toString(); 

     // Building Parameters 
     List<NameValuePair> params = new ArrayList<NameValuePair>(); 
     params.add(new BasicNameValuePair("name", name)); 
     params.add(new BasicNameValuePair("price", price)); 
     params.add(new BasicNameValuePair("description", description)); 

     // getting JSON Object 
     // Note that create product url accepts POST method 
     JSONObject json = jsonParser.makeHttpRequest(urlcreateproduct,"POST", params); 

     // check log cat fro response 
     Log.d("Create Response", json.toString()); 

     // check for success tag 
     try { 
      int success = json.getInt(TAG_SUCCESS); 

      if (success == 1) { 
       Toast.makeText(getApplicationContext(), " form submitted", Toast.LENGTH_LONG).show(); 

       // successfully created product 
       // Intent i = new Intent(getApplicationContext(), AllProductsActivity.class); 
       //startActivity(i); 

       // closing this screen 

       // finish(); 
      } else { 
       // failed to create product 
      } 
     } catch (JSONException e) 
     { 
      System.out.println("in catch of json exception"); 
      Toast.makeText(getApplicationContext()," in catch",Toast.LENGTH_LONG).show(); 

      e.printStackTrace(); 
     } 
     } catch (Exception ex) { 
      Log.e("MITS", ex.toString()); 
     } 

     return null; 
    } 

    /** 
    * After completing background task Dismiss the progress dialog 
    * **/ 
    protected void onPostExecute(String file_url) { 
     // dismiss the dialog once done 
     Toast.makeText(getApplicationContext(),"finished...",Toast.LENGTH_LONG).show(); 

     pDialog.dismiss(); 
    } 

    } 
}

JSONParser.java

package com.mits_form; 

/** 
    * Created by vanja on 3/29/14. 
*/ 

import android.util.Log; 

import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.NameValuePair; 
import org.apache.http.client.ClientProtocolException; 
import org.apache.http.client.entity.UrlEncodedFormEntity; 
import org.apache.http.client.methods.HttpGet; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.client.utils.URLEncodedUtils; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
    import java.io.UnsupportedEncodingException; 
    import java.util.List; 

    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; 

    } 
}

請指導。任何建議將不勝感激。

來源

2014-03-31 user2900761

我沒有看到有關此更新數據庫什麼。另外，你確定沒有錯誤嗎？張貼日誌。 – njzk2