im試圖將我的Android應用程序與用于網站的數據庫im連接，但不知何故它不想連接這是我的java代碼im用于連接我添加的安卓清單 <uses-permission android:name="android.permission.INTERNET"></uses-   permission>背景.javapackage com.example.myapplication;import android.app.AlertDialog;import android.content.Context;import  android.os.AsyncTask;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.OutputStreamWriter;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.net.URLEncoder;public class backgroundworker extends AsyncTask<String,Void, String> {Context context;AlertDialog alertDialog;backgroundworker(Context ctx){    context =ctx;}@Overrideprotected String doInBackground(String... params) {    String type = params[0];    String login_url = "http://10.0.2.2//android/login.php";    if (type.equals("login")){        try {            String Email = 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"));