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我正在尝试将 MySQL 中的数据库与 android 连接，但是当数据进入 NewProductActivity 并单击 createproduct 按钮时，会生成错误的不幸已停止。下面给出的代码。在这个数据库中给出了路径，但我不知道我必须给出哪个路径，因为我使用了 wamp 和通过 localhost 打开的数据库。运行此程序后，单击按钮将值插入数据库指针进入 createProduct 类及其方法，但不要进入 doInbackground()。

//NewProductActivity
package com.example.projectewithmysql;

import java.io.Console;
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.AlertDialog;
import android.app.AlertDialog.Builder;
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.*;
public class NewProductActivity extends Activity 
{
    private EditText inputName;
    private EditText inputPrice;
    private EditText inputDesc;
    private Button btnCreateProduct;
    JSONParser jsonParser  = new JSONParser();
     private static String url_create_product = "**localhost/android_coonect/product.php**";

        // JSON Node names
        private static final String TAG_SUCCESS = "success";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.add_product);
        inputName = (EditText) findViewById(R.id.inputName);
        inputPrice = (EditText) findViewById(R.id.inputPrice);
        inputDesc = (EditText) findViewById(R.id.inputDesc);

        // Create button
        btnCreateProduct = (Button) findViewById(R.id.btnCreateProduct);
        btnCreateProduct.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Toast.makeText(getApplicationContext(), "Enter into button",Toast.LENGTH_LONG).show();
                new CreateNewProduct().execute();
                Toast.makeText(getApplicationContext(), "call createNewProduct",Toast.LENGTH_LONG).show();

            }
        });
    }

     class CreateNewProduct extends AsyncTask<String, String, String> 
     {
         private ProgressDialog pDialog;
        @Override
        protected void onPreExecute() {
            // TODO Auto-generated method stub
            Toast.makeText(getApplicationContext(), "onPreExecute", Toast.LENGTH_LONG).show();
            super.onPreExecute();
             pDialog = new ProgressDialog(NewProductActivity.this);
                pDialog.setMessage("Creating Product..");
                pDialog.setIndeterminate(false);
                pDialog.setCancelable(true);
                pDialog.show();
        }
        @Override
        protected String doInBackground(String... args0) 
        {
            System.out.println("doInBackground");
            Toast.makeText(getApplicationContext(), "doInBackground", Toast.LENGTH_LONG).show();
            // TODO Auto-generated method stub
            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(url_create_product,
                    "POST", params);
            Toast.makeText(getApplicationContext(), ""+url_create_product, Toast.LENGTH_LONG).show();
            // 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) {
                    // successfully created product
                    Intent i = new Intent(getApplicationContext(), AllProductsActivity.class);
                    startActivity(i);

                    // closing this screen
                    finish();
                } else {
                    // failed to create product
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
            return null;
        }
        @Override
        protected void onPostExecute(String result) 
        {
            // TODO Auto-generated method stub
            super.onPostExecute(result);
            Toast.makeText(getApplicationContext(), "onPostExecute", Toast.LENGTH_LONG).show();
             pDialog.dismiss();
        }
     }
}

 here i am not used web-server but using json and I give information about database
I have made androiddb database and table is products that is given below

CREATE TABLE products(
pid int(11) primary key auto_increment,
name varchar(100) not null,
price decimal(10,2) not null,
description text,
created_at timestamp default now(),
updated_at timestamp
);
I try to enter data through android activity but error generate so please help..`enter code here`
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2 回答 2

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显然 'localhost' 不是您要连接的正确 URL。

如果您从模拟器运行此应用程序并且您想连接到运行模拟器的 PC 上运行的 Web 服务器，请使用 10.0.2.2，有关此的更多信息 - http://developer.android.com/tools/devices/模拟器.html

如果您不在模拟器上，请使用运行 Web 服务器的机器的实际 IP/主机。首先确保它可以访问 Android 设备。

于 2013-11-09T08:37:39.547 回答
0

如果您在模拟器上运行此应用程序我们 10.0.2.2 并且如果您想在真实设备上使用，请使用您的计算机 IP 地址 192.168.XX

于 2014-01-03T09:41:36.770 回答