Android(安卓)Preference Summary中实时显示内容变更

在Android的Preference中，当在一个EditTextPreference中输入内容关闭之后，并不能实时看见输入的内容，这在有时候是很不方便，这是一个很常用的需求。实际上，可以通过如下的方法来实现。

public class AdvancedPreferences extends PreferenceActivity implements OnSharedPreferenceChangeListener {    public static final String KEY_LIST_PREFERENCE = "list_preference";    public static final String KEY_CHECKBOX_PREFERENCE = "checkbox_preference";    private CheckBoxPreference mCheckBoxPreference;    private ListPreference mListPreference;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        // Load the XML preferences file        addPreferencesFromResource(R.xml.advanced_preferences);        // Get a reference to the preferences        mCheckBoxPreference = (CheckBoxPreference)getPreferenceScreen().findPreference(KEY_ADVANCED_CHECKBOX_PREFERENCE);        mListPreference = (ListPreference)getPreferenceScreen().findPreference(KEY_LIST_PREFERENCE);    }    @Override    protected void onResume() {        super.onResume();        // Setup the initial values        mCheckBoxPreference.setSummary(getPreferenceScreen().getSharedPreferences().getBoolean(key, false) ? "Disable this setting" : "Enable this setting");        mListPreference.setSummary("Current value is " + sharedPreferences.getValue(key, ""));         // Set up a listener whenever a key changes                    getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);    }    @Override    protected void onPause() {        super.onPause();        // Unregister the listener whenever a key changes                    getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);        }    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {        // Let's do something a preference value changes        if (key.equals(KEY_CHECKBOX_PREFERENCE)) {          mCheckBoxPreference.setSummary(sharedPreferences.getBoolean(key, false) ? "Disable this setting" : "Enable this setting");        }        else if (key.equals(KEY_LIST_PREFERENCE)) {          mListPreference.setSummary("Current value is " + sharedPreferences.getValue(key, ""));         }    }}

这样，当你变更了Preference的内容之后，就可以在Summary中看见内容了。

http://qinxch.iteye.com/blog/798953

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