Android應用程序沒有連接到mysql數據庫

我想連接android應用程序與MySQL數據庫我花了超過14個小時找到錯誤，但我失敗了，我的android應用程序沒有連接到數據庫我已經安裝了wamp服務器在默認端口80上。我正在檢查設備上的Android應用程序。我的設備和開發機連接在同一個路由器上，我已經使用IP路由檢查它Android應用程序沒有連接到mysql數據庫

這是192.168.8.101。我也曾嘗試使用這些網址

String login_url="http://10.0.2.2/receive.php"; 
String login_url="http://192.168.8.101/receive.php"; 
String login_url="http://127.0.0.1/receive.php";

所有這些網址無法正常工作

這是我的Android代碼

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

    Context ctx; 
    AlertDialog alertDialog; 
    BackgroundWorker(Context ctx){ 

     ctx=ctx; 
    } 

    @Override 

    protected String doInBackground(String... params) { 
     String type = params[0]; 
     String login_url = "http://10.0.2.2/receive.php"; 
     if(type.equals("login")) { 
      try { 
       String user_name = params[1]; 
       String password = params[2]; 
       URL url = new URL(login_url); 
       HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection(); 
       httpURLConnection.setRequestMethod("POST"); 
       httpURLConnection.setDoOutput(true); 
       httpURLConnection.setDoInput(true); 
       OutputStream outputStream = httpURLConnection.getOutputStream(); 
       BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8")); 
       String post_data = URLEncoder.encode("user_name","UTF-8")+"="+URLEncoder.encode(user_name,"UTF-8")+"&" 
         +URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode(password,"UTF-8"); 
       bufferedWriter.write(post_data); 
       bufferedWriter.flush(); 
       bufferedWriter.close(); 
       outputStream.close(); 
       InputStream inputStream = httpURLConnection.getInputStream(); 
       BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1")); 
       String result=""; 
       String line=""; 
       while((line = bufferedReader.readLine())!= null) { 
        result += line; 
       } 
       bufferedReader.close(); 
       inputStream.close(); 
       httpURLConnection.disconnect(); 
       return result; 
      } catch (MalformedURLException e) { 
       e.printStackTrace(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
     } 
     return null; 
    } 


    @Override 
     protected void onPostExecute(String result) { 
     alertDialog.setMessage(result); 
     alertDialog.show(); 
    } 

    @Override 
    protected void onPreExecute() { 
     alertDialog=new AlertDialog.Builder(ctx).create(); 
     alertDialog.setTitle("Login Status"); 
    } 

    @Override 
    protected void onProgressUpdate(Void... values) { 
     super.onProgressUpdate(values); 
    } 
}

這是主要的活動課

public class MainActivity extends AppCompatActivity { 

    EditText usernameEr,passwordEr; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     usernameEr=(EditText) findViewById(R.id.editText); 
     passwordEr=(EditText) findViewById(R.id.editText2); 
    } 

    public void Login(View v){ 


     String username=usernameEr.getText().toString(); 
     String password=passwordEr.getText().toString(); 

     String type="login"; 

     BackgroundWorker BgWorker= new BackgroundWorker(this); 
     BgWorker.execute(type,username,password); 


    } 
}

這是Android清單代碼

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.example.kidsklub.and"> 
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> 
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" /> 
    <uses-permission android:name="android.permission.INTERNET"/> 

    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme"> 
     <activity android:name=".MainActivity"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
    </application> 

</manifest>

這是PHP代碼

<?php 

include "connection.php"; 


$username = $_POST["user_name"]; 
$password = $_POST["password"]; 


$row=mysql_query("SELECT * FROM tayyab where username='$username' AND password='$password'") or die("query failed"); 

$row_count=mysql_num_rows($row); 

if($row_count>=1){ 

    echo "You have been logged in!"; 

} 
else{ 

     echo "You have been logged out!"; 

} 

?>

來源

2016-12-31 tayyab vohra

從doInBackground方法返回result varible呼叫。您正在返回null。

聲明result變量在class之上。

來源

2016-12-31 12:19:05

你能指出它嗎？ –

不工作！我已經在頂部聲明，但仍然沒有響應 –

public class BackgroundWorker extends AsyncTask String result = new String（）; 上下文ctx; AlertDialog alertDialog; ' –

Android應用程序沒有連接到mysql數據庫

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