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先生、他のクラスの共有設定ファイルにアクセスするにはどうすればよいですか? アプリケーションのデフォルト パスワードを 1234 にして、ユーザーが必要に応じて変更したい。このコードを使用して初めて機能しましたが、アプリケーションを再起動するまでに古いパスワードに戻ります。事前に助けてくれてありがとう

public class ChangePassword extends Activity {
/** Called when the activity is first created. */
EditText enterPassword, newPassword;
public final String filename = "PasswordFile";
String myPassword;
SharedPreferences myFolder;
public static String dataReturned = "";
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.changepassword);
    Button save = (Button)findViewById(R.id.btnSavePassword);
    enterPassword = (EditText)findViewById(R.id.etCurrentPassword);
    newPassword = (EditText)findViewById(R.id.etNewPassword);
    myFolder = getSharedPreferences(filename, 0);//a folder
    dataReturned = myFolder.getString("passwordKey", "");
    if(dataReturned.equals(""))
    {
        SharedPreferences.Editor editor = myFolder.edit();
        editor.putString("passwordKey", "1234"); //newData is new pass, passwordKey is key
        editor.commit();
    }

    save.setOnClickListener(new OnClickListener()
    {
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            String stringData = enterPassword.getText().toString().trim();
            dataReturned = myFolder.getString("passwordKey", ""); //key/def message
            //if stored password is equal to entered password
            if(dataReturned.equals(stringData))
            {
                String newData = newPassword.getText().toString().trim();
                SharedPreferences.Editor editor = myFolder.edit();
                editor.putString("passwordKey", newData); //newData is new pass, passwordKey is key
                editor.commit();
                dataReturned  = myFolder.getString("passwordKey", "couldn't load data"); //get file from sharedpref
                Toast.makeText(getApplicationContext(),
                        "Password successfully changed",
                        Toast.LENGTH_LONG).show();
                enterPassword.setText("");
                newPassword.setText("");
            }
            else 
            {
                Toast.makeText(getApplicationContext(),
                        "Wrong password!",
                        Toast.LENGTH_LONG).show();
                enterPassword.setText("");
                newPassword.setText("");
            }
        }
    });
}//oncreate()

}

ここで、他のクラスの sharedpreferences に保存されたデータを使用したい

public void dispatch_button_action(View view){
    final EditText password_input = new EditText(this); // create an text input field
    password_input.setHint("Enter Password"); // put a hint in it
    password_input.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD); // change it to password type

    AlertDialog.Builder alertDialog = new Builder(this); // create an alert box
    alertDialog.setTitle("Enter Password"); // set the title
    alertDialog.setView(password_input);  // insert the password text field in the alert box
    alertDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() { // define the 'OK' button
        public void onClick(DialogInterface dialog, int which) {
             String entered_password = password_input.getText().toString();
             String password = ChangePassword.myFolder.getString("passwordKey", "");
             if(!password.trim().equals(""))
             {
                 testPassAndSendSms(password.trim(), entered_password);
             }
             else
             {
                 testPassAndSendSms(my_password, entered_password);
             }

        } 
    });
    alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { // define the 'Cancel' button
        public void onClick(DialogInterface dialog, int which) {
            dialog.cancel();
        } 
    });
    alertDialog.show(); // show the alert box
}//end dispatch_button
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1 に答える 1

2

現在、ユーザーが入力した最新のパスワードを Alertbox に保存していないため、別のアクティビティで最新のパスワードを SharedPreferences に次のように保存します。

 alertDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() { 
  public void onClick(DialogInterface dialog, int which) {
   String entered_password = password_input.getText().toString();
   SharedPreferences myFolder = You_Current_Activitu.this.getSharedPreferences(filename, 0);
        String  dataReturned = myFolder.getString("passwordKey", "");
        if(dataReturned.equals(""))
        {
            SharedPreferences.Editor editor = myFolder.edit();
            editor.putString("passwordKey", entered_password); 
            editor.commit();
        }
于 2012-12-06T18:48:01.460 に答える