经过最初的承诺共享preferences.Editor未更新 [英] SharedPreferences.Editor not being updated after initial commit

问题描述

我是有点困惑在这里。我试图改变一个EditText preference的价值，但它不是在视图中更新。 （这是在preferenceActivity）

I'ma a bit confused here. I'm trying to change the value of an EditTextPreference, but it is not updated in the view. (This is in a PreferenceActivity)

下面是我的code：

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  addPreferencesFromResource(R.xml.modify_instrument_preferences);

  // Set default values
  SharedPreferences customSharedPreference = PreferenceManager.getDefaultSharedPreferences(this);
  SharedPreferences.Editor editor = customSharedPreference.edit();
  modifying = getObjectWithName(); //Some object with a name;

  editor.putString("namePref", modifying.getName());
  editor.commit();
  android.util.Log.d("TEST", "written: "+customSharedPreference.getString("namePref",""));
}

我printlns打印出的有效信息，并提交（）返回true，但在点击的EditText preference，它显示了旧值。如果我旋转屏幕，导致的onCreate得到再次运行时，EditText上preference有正确的价值。

My printlns print out valid information, and the commit() returns true, but on clicking the EditTextPreference, it displays the old value. If I rotate the screen, causing the onCreate to get run again, the EditTextPreference has the right value.

所以傻了眼。为什么没有这种变化正在对UI更新？

So perplexing. Why isn't this change being updated in the UI?

编辑：

我不知道为什么上面不工作，但我设法只是做来改变它：

I'm not sure why the above isn't working, but I managed to change it just by doing:

  EditTextPreference namePref = (EditTextPreference) findPreference("namePref");
  namePref.setText("the text");

这是更新视图每次。

推荐答案

虽然我知道有一些结构到位preferenceActivities来跟踪这个信息本身，它似乎并没有被据可查。我发现，添加上preferenceChangeListener 到preference将允许你只要preference改变让那些编辑。

Although I know there are some constructs in place for PreferenceActivities to keep track of this info themselves, it doesn't seem to be well documented. I have found that adding an onPreferenceChangeListener to the preference will allow you to make those edits as soon as the preference is changed.

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