如何将数据从php返回到eclipse？答案

【问题标题】：How to return data from php to eclipse?如何将数据从php返回到eclipse？
【发布时间】：2013-01-09 02:03:17
【问题描述】：

您好，我正在使用 php 从 mysql 数据库中获取数据，并在成功接收数据后调用一个新的活动，我需要在其中打印数据。

这是我的代码：

public class RecoProd extends Activity {
    EditText pd;
    TextView error;

    ArrayList<NameValuePair> postParameters;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.recomain);
        pd = (EditText) findViewById(R.id.name);

        error = (TextView) findViewById(R.id.myTableLayout);

        pd.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                postParameters = new ArrayList<NameValuePair>();
                postParameters.add(new BasicNameValuePair("product", pd
                        .getText().toString()));


                // String valid = "1";

                DownloadWebPageTask dw = new DownloadWebPageTask();
                dw.execute("");

            }
        });
    }

    private class DownloadWebPageTask extends AsyncTask<String, Void, String> {
        @Override
        protected String doInBackground(String... urls) {
            String response = null;
            for (String url : urls) {
                try {
                    response = CustomHttpClient.executeHttpPost("http://10.0.2.2/abc/check2.php", postParameters);  
                    String res = response.toString();
                    // res = res.trim();
                    res = res.replaceAll("\\s+", "");
                    // error.setText(res);
                    if(res.equals("1")){     ***<<--------------I think the error is here***
                        Intent loginintent = new Intent(RecoProd.this, RecoProd1.class);
                        startActivity(loginintent);
                    }
                    else
                        error.setText("Sorry!! ");





                } catch (Exception e) {


                }
            }
            return response;
        }

        @Override
        protected void onPostExecute(String result) {
        }
    }
}

这是我的 php 代码：

<?php
$pd=$_POST['name'];

//connect to the db
$user = "root";
$pswd = "";
$db = "mylogin";
$host = "localhost";
$conn = mysql_connect($host, $user, $pswd);
mysql_select_db($db);

$query = "SELECT * FROM recoprod  ";
$result = mysql_query("SELECT * FROM recoprod");
while($row = mysql_fetch_array($result))
  {
  $output[]=$row;
  }
/*
$result = mysql_query($query) or die("Unable to verify user because : " . mysql_error());
//this is where the actual verification happens  
if(mysql_num_rows($result) > 0)  
echo 1;  // for correct login response  
else  
echo 0; // for incorrect login response */
?>

当我执行它时，我得到了一个力关闭。

EDITED CODE





package com.androidhive.googleplacesandmaps;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.ArrayList;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class RecoProd extends Activity {
    EditText pd;
    TextView error;

    ArrayList<NameValuePair> postParameters;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {

        try {
            Class<?> strictModeClass = Class.forName("android.os.StrictMode", true, Thread.currentThread()
                    .getContextClassLoader());

            Class<?> threadPolicyClass = Class.forName("android.os.StrictMode$ThreadPolicy", true, Thread
                    .currentThread().getContextClassLoader());

            Class<?> threadPolicyBuilderClass = Class.forName("android.os.StrictMode$ThreadPolicy$Builder", true,
                    Thread.currentThread().getContextClassLoader());

            Method setThreadPolicyMethod = strictModeClass.getMethod("setThreadPolicy", threadPolicyClass);

            Method detectAllMethod = threadPolicyBuilderClass.getMethod("detectAll");
            Method penaltyMethod = threadPolicyBuilderClass.getMethod("penaltyLog");
            Method buildMethod = threadPolicyBuilderClass.getMethod("build");

            Constructor<?> threadPolicyBuilderConstructor = threadPolicyBuilderClass.getConstructor();
            Object threadPolicyBuilderObject = threadPolicyBuilderConstructor.newInstance();

            Object obj = detectAllMethod.invoke(threadPolicyBuilderObject);

            obj = penaltyMethod.invoke(obj);
            Object threadPolicyObject = buildMethod.invoke(obj);
            setThreadPolicyMethod.invoke(strictModeClass, threadPolicyObject);

        } catch (Exception ex) {
            String TAG = null;
            Log.w(TAG, ex);
        }
        super.onCreate(savedInstanceState);
        setContentView(R.layout.recomain);
        pd = (EditText) findViewById(R.id.name);

        error = (TextView) findViewById(R.id.showresult);

        pd.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                postParameters = new ArrayList<NameValuePair>();
                postParameters.add(new BasicNameValuePair("product", pd
                        .getText().toString()));


                // String valid = "1";

                DownloadWebPageTask dw = new DownloadWebPageTask();
                dw.execute("");

            }
        });
    }

    private class DownloadWebPageTask extends AsyncTask<String, Void, String> {
        @Override
        protected String doInBackground(String... urls) {
            String response = null;
            for (String url : urls) {
                try {
                    response = CustomHttpClient.executeHttpPost("http://10.0.2.2/abc/check2.php", postParameters);  
                    String res = response.toString();
                    // res = res.trim();
                    res = res.replaceAll("\\s+", "");
                    // error.setText(res);
                    try{
                        res = "";
                  JSONArray jArray = new JSONArray(res);
                        for(int i=0;i<jArray.length();i++){
                                JSONObject json_data = jArray.getJSONObject(i);
                                Log.i("prod_id","id: "+json_data.getInt("prod_id")+
                                        ", prod_name: "+json_data.getString("prod_name")+
                                        ", prod_category: "+json_data.getInt("prod_category")+
                                        ", prod_cost: "+json_data.getInt("prod_cost")
                                );
                                //Get an output to the screen
                                res += "\n" + json_data.getString("prod_id") + " -> "+ json_data.getInt("prod_name");
                        }
                }
                catch(JSONException e){
                        Log.e("log_tag", "Error parsing data "+e.toString());
                }

                try{
                 error.setText(res);
                }
                catch(Exception e){
                 Log.e("log_tag","Error in Display!" + e.toString());;          
                }   
           }
                 catch (Exception e) {
            Log.e("log_tag","Error in http connection!!" + e.toString());     
           }
            }
            return response;

               }
        @Override
        protected void onPostExecute(String result) {
        }
    }
}

这是我的 php 代码：

<?php
$pd = $_POST['name'];

//connect to the db
$user = "root";
$pswd = "";
$db = "mylogin";
$host = "localhost";
$conn = mysql_connect($host, $user, $pswd);
mysql_select_db($db);

$query = "SELECT * FROM recoprod  ";
$result = mysql_query("SELECT * FROM recoprod");
while($row = mysql_fetch_array($result)) {
    $output[] = $row;
}
print(json_encode($output));
mysql_close();
/*
$result = mysql_query($query) or die("Unable to verify user because : " . mysql_error());
//this is where the actual verification happens  
if(mysql_num_rows($result) > 0)  
echo 1;  // for correct login response  
else  
echo 0; // for incorrect login response */
?>

您好，我对上面编辑的代码进行了一些更改。

我只有 2 行，每行包含 4 个数据。

【问题讨论】：

我没有任何 logcat 错误我认为错误出现在我认为我没有正确执行的数据的 php 文件中。
尝试在服务器控制台或本地主机中回显您的结果。并在您的代码周围加上 try catch 以在执行 Asyntask 时获取异常
您正在尝试获取 recoprod 表中的所有行并循环它们。如果您的表有更多的记录，那么“while”循环将需要更多时间来完成执行。因此，您必须通过更改 php.ini 文件中的“最大执行时间”来等待循环完成。
怎么做可以编辑上面的代码并显示？？ @hilarudeens
@JayantShinde：你在这条线上得到了什么String res = response.toString();？并添加CustomHttpClient类代码

标签： php android mysql

【解决方案1】：

您的问题出在 AsyncTask 部分

当您使用 AsyncTask 时，您可以在 doInBackground 函数上处理数据，但在 onPostExecute 上更新 UI。将处理后的值返回给 onPostExecute，因为在 android 上使用 AsyncTask 允许您在加载完成后更改布局上的内容。但仅在 onPostExecute 状态下，因此在 doInBackground 上处理您的 json，然后将其反映到 onPostExecute 上的布局

public class RecoProd extends Activity {
EditText pd;
TextView error;

ArrayList<NameValuePair> postParameters;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.recomain);
    pd = (EditText) findViewById(R.id.name);

    error = (TextView) findViewById(R.id.myTableLayout);

    pd.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            postParameters = new ArrayList<NameValuePair>();
            postParameters.add(new BasicNameValuePair("product", pd
                    .getText().toString()));


            // String valid = "1";

            DownloadWebPageTask dw = new DownloadWebPageTask();
            dw.execute("");

        }
    });
}

private class DownloadWebPageTask extends AsyncTask<String, Void, String> {
    @Override
    protected String doInBackground(String... urls) {
        String response = null;
        for (String url : urls) {
            try {
                response = CustomHttpClient.executeHttpPost("http://10.0.2.2/abc/check2.php", postParameters);  
                String res = response.toString();
                // res = res.trim();
                res = res.replaceAll("\\s+", "");
                // error.setText(res);






            } catch (Exception e) {


            }
        }
        return res;
    }

    @Override
    protected void onPostExecute(String result) {

         if(result.equals("1")){    
             Intent loginintent = new Intent(RecoProd.this, RecoProd1.class);
             startActivity(loginintent);
         }
         else
             error.setText("Sorry!! ");
    }
}

}

【讨论】：

如果您遇到错误，请将您的“String res”定义置于 try 案例之上
另外，如果您想修复您的第二个修改代码，您的问题是您在此行更新 ui error.setText(res);在 doInBackground - 将其移动到 onPostExecute 并在您的 doInBackground 上返回 res 作为结果

【解决方案2】：

你可以这样做：

public class RecoProd extends Activity {
EditText pd;
TextView error;

ArrayList<NameValuePair> postParameters;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.recomain);
    pd = (EditText) findViewById(R.id.name);

    error = (TextView) findViewById(R.id.myTableLayout);

    pd.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            postParameters = new ArrayList<NameValuePair>();
            postParameters.add(new BasicNameValuePair("product", pd
                    .getText().toString()));


            // String valid = "1";

            downloadWebPageTask();

        }
    });
}

private void downloadWebPageTask extends AsyncTask<String, Void, String> {
    String url = "http://10.0.2.2/abc/check2.php?postParameters=paramValue";
    grabURL(url);
}


public void grabURL(String url){
    try {
        new GrabURL().execute(new URL(url));
    } catch (MalformedURLException e) {
        e.printStackTrace();
    }
}

private class GrabURL extends AsyncTask<URL, Integer, JSONObject> {

    @Override
    protected JSONObject doInBackground(URL... urls) {
        // This method will send the http request
        JSONObject jsonResponse=null;
        try 
        {
            URL link = urls[0];
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpGet request = new HttpGet(link.toString());
            ResponseHandler<String> responseHandler=new BasicResponseHandler();
            String responseBody = httpClient.execute(request, responseHandler);
            jsonResponse = new JSONObject(responseBody);
        }
        catch (Exception e) {
            e.printStackTrace();
        }

        return jsonResponse;
    }

    @Override
    protected void onPreExecute() {
        // This method will be executed before the http request
        // In this method you can do things like showing the loading sign
    }

    @Override
    protected void onPostExecute(JSONObject jsonObj) {
        // This method will run after the http request and contains the results
        // This method expectes you return a valid jSon from the server
        try {
            if(! jsonObj.getString("code").equalsIgnoreCase("200") ){
                // Bad response from server
            }
            else if( jsonObj.has("data") ){
                JSONArray dataArray = jsonObj.getJSONArray("data");

                String tmpUserLoc = (String) jsonObj.getJSONObject("data").get("userLocation");
                String tempUserNIC = (String) jsonObj.getJSONObject("data").get("userNIC");
            }

        } catch (JSONException e) {
            e.printStackTrace();
        }
        // You can stop the loading sign here if you showed it in OnPreExecute
    }

}

}

我没有测试过这段代码，但它应该可以工作。如果您要从服务器返回 json 数组，您可能需要查看 jSonArray doc 或 this link 也可能会有所帮助。

【讨论】：