Question

我想创建一个共享首选项以将一些身份验证信息保存到第三方服务。在我的preferences.xml中有一个登录和密码字段，但我想在编辑时检查值是否有效（验证）。什么是好方法？

到目前为止，我有这个：

on create

findPreference("sync_service_enabled").setOnPreferenceChangeListener(this);
findPreference("sync_service_user").setOnPreferenceChangeListener(this);
findPreference("sync_service_pwd").setOnPreferenceChangeListener(this);

我的听众

public boolean onPreferenceChange(Preference preference, Object newValue) {
    if (preference.getKey().contains("sync_service")){
     new AuthenticationRemoteAsyncTask(this.getActivity(), user, password, service).execute();
    }
    return true;

我还需要保存远程服务生成的令牌，所以我需要等待aynstask完成。

任何消化？

Answer 1

I resolved my problem criating a custom dialogpreference. I Replaced the positive button onclicklistener so it dont close the dialog automatically and start my remote task. The asynctask will notify my preferencedialog after success and only then I close the dialog.

CODE

@Override
protected void showDialog(Bundle state) {
    super.showDialog(state);
    ...
    positiveButton.setOnClickListener(this);
    negativeButton.setOnClickListener(this);
}

onclick handler

public void onClick(View view){
    this.result = null;
    if(view.getId() == positiveButton.getId()) {
        String password = textPassword.getText().toString();
        String user = textLogin.getText().toString();

        new AuthenticationTask(getContext(),user, password)
            .notify(this).execute();
    }else{
        alertDialog.dismiss();
    }
}

check the result before close

@Override
protected void onDialogClosed(boolean positiveResult) {
    super.onDialogClosed(positiveResult);

    if (result != null) {
        SharedPreferences.Editor editor = getEditor();
        editor.putString("sync_service_token",result);
        editor.commit();
    }
}

AuthenticationTask is a custom class that wrapp all the async stuff and call a notify method.

在PreferenceFragment中使用AsyncTask

1 个答案: