ログインが成功した後、別のアクティビティ（プロファイルアクティビティ）でユーザのデータベースを読み込む方法は？私はプロフィールページを作成しようとしています

Question

私はログインアクティビティを作成しました。ログイン成功後、正常に動作しています。 "profile"アクティビティが開かれていますが、mysqlデータベースに格納されているログインしたユーザの詳細をロードしたいと思っています。誰も私にそれをやる方法を助けることができますか？

マイBackgroundworker.javaファイル

public class BackgroundWorker extends AsyncTask<String, Void, String> { 
 
    Context context; 
 
    AlertDialog alertDialog; 
 
    BackgroundWorker (Context ctx){ 
 
     context = ctx; 
 
    } 
 
    @Override 
 
    protected String doInBackground(String... params) { 
 
     String type = params[0]; 
 
     String login_url = "http://192.168.43.59/login.php"; 
 
     String register_url = "http://192.168.43.59/register.php"; 
 
     if (type.equals("login")) { 
 
      try { 
 
       String username = 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(username,"UTF-8")+"&" 
 
         +URLEncoder.encode("pass_word","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(); 
 
      } 
 
     } else if (type.equals("register")){ 
 
      try { 
 
       String name = params[1]; 
 
       String surname = params[2]; 
 
       String username = params[3]; 
 
       String password = params[4]; 
 
       String address = params[5]; 
 
       String pinArea_code = params[6]; 
 
       String email = params[7]; 
 
       String phone = params[8]; 
 
       URL url = new URL (register_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("reg_name","UTF-8")+"="+URLEncoder.encode(name,"UTF-8")+"&" 
 
         +URLEncoder.encode("reg_surname","UTF-8")+"="+URLEncoder.encode(surname,"UTF-8")+"&" 
 
         +URLEncoder.encode("reg_user","UTF-8")+"="+URLEncoder.encode(username,"UTF-8")+"&" 
 
         +URLEncoder.encode("reg_pass","UTF-8")+"="+URLEncoder.encode(password,"UTF-8")+"&" 
 
         +URLEncoder.encode("reg_add","UTF-8")+"="+URLEncoder.encode(address,"UTF-8")+"&" 
 
         +URLEncoder.encode("reg_pin","UTF-8")+"="+URLEncoder.encode(pinArea_code,"UTF-8")+"&" 
 
         +URLEncoder.encode("reg_mail","UTF-8")+"="+URLEncoder.encode(email,"UTF-8")+"&" 
 
         +URLEncoder.encode("reg_ph","UTF-8")+"="+URLEncoder.encode(phone,"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 onPreExecute() { 
 
     alertDialog = new AlertDialog.Builder(context).create(); 
 
     alertDialog.setTitle("Login Status"); 
 
    } 
 

 
    @Override 
 
    protected void onPostExecute(String result) { 
 
     alertDialog.setMessage(result); 
 
     alertDialog.show(); 
 
     if(result.contains("login success")){ 
 
      Intent ilogin = new Intent(context, Profile.class); 
 
      context.startActivity(ilogin); 
 
      alertDialog.dismiss(); 
 
     } else if (result.contains("Account Created")){ 
 
      Intent iregister = new Intent(context, about_us.class); 
 
      context.startActivity(iregister); 
 
      alertDialog.dismiss(); 
 
     } 
 

 
    } 
 

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

マイMainActivity.Javaファイル

package com.quickhomeservice.qhs.astudio; 
 

 
import android.content.Intent; 
 
import android.support.v7.app.ActionBar; 
 
import android.support.v7.app.AppCompatActivity; 
 
import android.os.Bundle; 
 
import android.view.Menu; 
 
import android.view.MenuInflater; 
 
import android.view.MenuItem; 
 
import android.view.View; 
 
import android.widget.Button; 
 
import android.widget.EditText; 
 
import android.widget.TextView; 
 

 
public class MainActivity extends AppCompatActivity { 
 
    EditText UsernameET, PasswordET; 
 
    //String username, password; 
 
    private TextView button_reg; 
 
    @Override 
 
    protected void onCreate(Bundle savedInstanceState) { 
 
     super.onCreate(savedInstanceState); 
 
     setContentView(R.layout.activity_main); 
 
     UsernameET = (EditText)findViewById(R.id.editText_user); 
 
     PasswordET = (EditText)findViewById(R.id.editText_pass); 
 
     ActionBar ab = getSupportActionBar(); 
 
     //ab.setLogo(R.mipmap.logo_mini86); 
 
     ab.setDisplayUseLogoEnabled(true); 
 
     ab.setDisplayShowHomeEnabled(true); 
 
     OnClickButtonListner(); 
 
    } 
 

 
    public void OnLogin (View view){ 
 
     String username = UsernameET.getText().toString(); 
 
     String password = PasswordET.getText().toString(); 
 
     String type = "login"; 
 

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

 
    public void OnClickButtonListner(){ 
 
     button_reg=(TextView) findViewById(R.id.register_link); 
 
     button_reg.setOnClickListener(
 
       new View.OnClickListener() { 
 
        @Override 
 
        public void onClick(View v) { 
 
         Intent intent = new Intent("com.quickhomeservice.qhs.astudio.registraion_form"); 
 
         startActivity(intent); 
 
        } 
 
       } 
 
     ); 
 
    } 
 

 
    @Override 
 
    public boolean onCreateOptionsMenu(Menu menu) { 
 
     MenuInflater menuInflater = getMenuInflater(); 
 
     menuInflater.inflate(R.menu.menu_activity, menu); 
 
     return super.onCreateOptionsMenu(menu); 
 
    } 
 

 
    @Override 
 
    public boolean onOptionsItemSelected(MenuItem item) { 
 
     switch (item.getItemId()){ 
 
      case R.id.Contact_id: 
 
       Intent intent1 = new Intent(this, contact_us.class); 
 
       startActivity(intent1); 
 
       return true; 
 
      case R.id.About_id: 
 
       Intent intent2 = new Intent(this, about_us.class); 
 
       startActivity(intent2); 
 
       return true; 
 
     } 
 

 
     return super.onOptionsItemSelected(item); 
 
    } 
 
}

そして、私のlogin.phpファイル

<?php 
 
require "conn.php"; 
 
$user_name = $_POST["user_name"]; 
 
$user_pass = $_POST["pass_word"]; 
 
$mysql_qry = "select * from user_data where username like '$user_name' and password like '$user_pass';"; 
 
$result = mysqli_query($conn ,$mysql_qry); 
 
if(mysqli_num_rows($result) > 0){ 
 
echo "login success"; 
 
} 
 
else{ 
 
echo "login failed"; 
 
} 
 
?>

Answer 1

あなたはログインクラスに静的な最終文字列を作成し、ユーザーを認証するとき、これらにデータベース・ユーザー情報を取得することができます。

その後、ユーザーデータにアクセスする必要があるときはいつでも、ログインクラスのインスタンスを作成できます。

Answer 2

あなたのPHPファイルでは、クエリが指定された条件に一致するテーブルのすべての列を選択するため、 "成功したログイン"をエコーするのではなく、JSONとしてクエリの結果をエコーすることができます。

PHPの例：

<?php 

require "conn.php"; 

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


$response["user_data"] = array(); 

//Use mysqli_prepare to secure yourself from sql injection. 

$query = $conn->prepare("Select * from user_data where username = ? and password = ?"); 
$query->bind_param("ss", $user, $password); 
$query->execute(); 

$result = $query->get_result(); 

// check if the query returned a row (which means success) 
if(mysqli_num_rows($result) > 0){ 

    $response["message"] = "Log in success"; 

    $getUserData = $conn->prepare(// your query here where username = ?); 
    $getUserData->bind_param("s", $user); 
    $getUserData->execute(); 

    $getResult = $getUserData->get_result(); 

    while($row_data = $getResult->fetch_assoc()){ 

     array_push($response["user_data"] = $row_data); 

    } 

    echo json_encode($response); 


} 
else{ 

    // your else statement. 

} 

?> 

とJavaでそれを解析。