以前のログイン（バックグラウンドタスク）を記憶しているAndroid

Question

ユーザーがmysqlデータベースに存在するかどうかをチェックするログインを試行していますが、アプリを実行すると以前のログインの詳細が記憶されます。私はバックグラウンドタスクに問題があると思っています。私はそれをコメントアウトしても、ログインの詳細をうまく表現することができます。

public class Tab1Activity extends Activity 
{ 
    String task,username,password; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.tab1); 

     final Button buta = (Button) findViewById(R.id.button1); 
     final Button butb = (Button) findViewById(R.id.button2); 
     final TextView usernameTV = (TextView) findViewById(R.id.editText1); 
     final TextView passwordTV = (TextView) findViewById(R.id.editText2); 

     buta.setOnClickListener(new View.OnClickListener() 
     { 
      public void onClick(View v) 
      { 
       SharedPreferences preferences = getSharedPreferences("MYPREFS", Context.MODE_PRIVATE); 
       //editor = preferences.edit(); 

       username=usernameTV.getText().toString(); 
       password=passwordTV.getText().toString(); 
       task="login"; 
       Toast.makeText(getApplicationContext(), username+" "+password, Toast.LENGTH_SHORT).show(); 

       // create and call background activity         

       BackgroundTask backgroundTaskLogin = new BackgroundTask(Tab1Activity.this);     
       backgroundTaskLogin.execute(task,username,password); 

       //get data back from sharedpreference 
       String driver_exist = preferences.getString("myDatalogin","ERROR getting name"); 

       //display datas 
       String[] loginSeparated = driver_exist.split(","); 
       Toast.makeText(getApplicationContext(), loginSeparated[0], Toast.LENGTH_SHORT).show(); 


       if (loginSeparated[0].equals("true")) 
       { 

       int finalId = Integer.parseInt(loginSeparated[1]); 
       //Toast.makeText(getApplicationContext(), loginSeparated[1], Toast.LENGTH_SHORT).show(); 

       SharedPreferences.Editor editor = getSharedPreferences("MYPREFS", Context.MODE_PRIVATE).edit(); 
       editor.putInt("TaxiDriverId", finalId); 
       editor.apply(); 

       //once clicked - jump to tab2 
       TabActivity tabs = (TabActivity) getParent(); 
       tabs.getTabHost().setCurrentTab(1); 
       } 
       else 
       { 
        Toast.makeText(getApplicationContext(), "Wrong password", Toast.LENGTH_SHORT).show(); 
       } 
      } 
     }); 
    } 

    ////////////////////////////////////////////////////// 
    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.tab1, menu); 
     return true; 
     } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 
     if (id == R.id.action_settings) { 
      return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 
} 

これは私が問題がある場所を信じるバックグラウンドトークです。

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

     SharedPreferences preferences; 
     SharedPreferences.Editor editor; 
     SharedPreferences.Editor pig; 

     Context context; 

     BackgroundTask(Context ctx) 
     { 
      this.context = ctx; 
     } 

     @Override 
     protected String doInBackground(String... params) 
     { 
      String urlLogin = ""; 
      preferences = context.getSharedPreferences("MYPREFS", Context.MODE_PRIVATE); 
      editor = preferences.edit(); 
      editor.putString("flag","0"); 
      editor.commit(); 

      String task = params[0]; 
      String loginusername; 
      String loginpassword; 


      if (task.equals("login")) 
      {   
       urlLogin = "http://super.com/LoginAndRegister-login.php"; 
       loginusername = params[1]; 
       loginpassword = params[2]; 



       try 
       { 
        URL url = new URL(urlLogin); 
        HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection(); 
        httpURLConnection.setRequestMethod("POST"); 
        httpURLConnection.setDoOutput(true); 
        httpURLConnection.setDoInput(true); 


        //send the driver number to the database 
        OutputStream outputStream = httpURLConnection.getOutputStream(); 
        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream,"UTF-8"); 
        BufferedWriter bufferedWriter = new BufferedWriter(outputStreamWriter); 

        String myDatalogin = URLEncoder.encode("identifier_loginEmail","UTF-8")+"="+URLEncoder.encode(loginusername,"UTF-8") 
        +"&"+URLEncoder.encode("identifier_loginPassword","UTF-8")+"="+URLEncoder.encode(loginpassword,"UTF-8"); 
        bufferedWriter.write(myDatalogin); 
        bufferedWriter.flush(); 
        bufferedWriter.close(); 
        outputStream.close(); 

        //get response from the database 
        InputStream inputStream = httpURLConnection.getInputStream(); 
        InputStreamReader inputStreamReader = new InputStreamReader(inputStream,"UTF-8"); 
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader); 
        String dataResponse = ""; 
        String inputLine = ""; 
        while((inputLine = bufferedReader.readLine()) != null) 
        { 
         dataResponse += inputLine; 
        } 
        bufferedReader.close(); 
        inputStream.close(); 
        httpURLConnection.disconnect(); 

        editor.putString("flag","login"); 
        editor.commit();          
        pig = preferences.edit(); 
        pig.putString("myDatalogin",dataResponse); 
        pig.commit();    
        return dataResponse; 
       } 
       catch (MalformedURLException e) 
       { 
        e.printStackTrace(); 
       } 
       catch (IOException e) 
       { 
        e.printStackTrace(); 
       } 

      }//end if statement 

Answer 1

ますが、これは次回の活動は、それが新鮮な起動します開始されていることを保証しますActivityコールfinish()で行われています。また、ActivityタグのlaunchMode属性をAndroidManifest.xmlに見て、正しく活動を開始していることを確認してください。 https://developer.android.com/guide/topics/manifest/activity-element.html