Question

我有以下内容创建了包含两个通知设置的设置页面：

SettingsActivity.java

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
public static class NotificationPreferenceFragment extends PreferenceFragment {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.pref_notification2);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        if (id == android.R.id.home) {
            startActivity(new Intent(getActivity(), SettingsActivity.class));
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

pref_notification2.xml

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">


<SwitchPreference
    android:defaultValue="true"
    android:key="notifications_team_pick"
    android:title="Team Pick Reminders" />


<SwitchPreference
    android:defaultValue="true"
    android:key="notifications_results"
    android:title="Results Notifications" />
</PreferenceScreen>

我希望在按下通知选项时调用以下内容：

    private static Preference.OnPreferenceChangeListener sBindPreferenceSummaryToValueListener = new Preference.OnPreferenceChangeListener() {
    @Override
    public boolean onPreferenceChange(Preference preference, Object value) {
        String stringValue = value.toString();

        Log.d("Am I: ", "Here");

        if (preference instanceof ListPreference) {
            // For list preferences, look up the correct display value in
            // the preference's 'entries' list.
            ListPreference listPreference = (ListPreference) preference;
            int index = listPreference.findIndexOfValue(stringValue);

            // Set the summary to reflect the new value.
            preference.setSummary(
                    index >= 0
                            ? listPreference.getEntries()[index]
                            : null);

        } else {
            // For all other preferences, set the summary to the value's
            // simple string representation.
            preference.setSummary(stringValue);
            Log.d("Am I: ", "Here 2");
        }
        return true;
    }
};

然而，无论我尝试什么，一旦按下切换按钮，我就无法发生任何事情。任何帮助将不胜感激，非常感谢，艾伦。

添加以匹配建议：

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
public static class NotificationPreferenceFragment extends PreferenceFragment implements Preference.OnPreferenceChangeListener{

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d("I am at: ", "OnCreate extends");
        addPreferencesFromResource(R.xml.pref_notification2);
    }

    @Override
    public boolean onPreferenceChange(Preference preference, Object value) {
        //Your preference change method code.
        Log.d("I am at: ", "OnCreate extends Hope");
        return true;

    }

}

Answer 1

您需要像这样更改您的片段 -

 package com.accelerate.myprefapplication;

 import android.os.Bundle;
 import android.preference.Preference;
 import android.preference.PreferenceActivity;
 import android.preference.PreferenceFragment;
 import android.preference.PreferenceManager;
 import android.util.Log;

 public class MyPreferencesActivity extends PreferenceActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getFragmentManager().beginTransaction().replace(android.R.id.content, new MyPreferenceFragment()).commit();
}


public static class MyPreferenceFragment extends PreferenceFragment implements Preference.OnPreferenceChangeListener {
    @Override
    public void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.path);
        bindPreferenceSummaryToValue(findPreference("notifications_team_pick"));
        bindPreferenceSummaryToValue(findPreference("notifications_results"));

    }

    private void bindPreferenceSummaryToValue(Preference preference) {
        // Set the listener to watch for value changes.
        preference.setOnPreferenceChangeListener(this);

        // Trigger the listener immediately with the preference's
        // current value.
        onPreferenceChange(preference,
                PreferenceManager
                        .getDefaultSharedPreferences(preference.getContext())
                        .getBoolean(preference.getKey(), true));
    }

    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        boolean state = Boolean.valueOf(newValue.toString());

        Log.d("Am I: ", "Here");

        return true;

    }
}


}

我认为这应该适合你。

寻找这个答案。

Answer 2

那不行。您必须检索与交换机交互后存储的值。用它来检索数据。

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
        String effchoice = prefs.getString("notifications_team_pick", getString(R.string.default_eff));

BTW，您的pref_notification2.xml错误。您尚未设置要保存的值和其他内容。像这样：

<ListPreference
    android:dependency="pref_sync"
    android:key="pref_syncConnectionType"
    android:title="@string/pref_syncConnectionType"
    android:dialogTitle="@string/pref_syncConnectionType"
    android:entries="@array/pref_syncConnectionTypes_entries"
    android:entryValues="@array/pref_syncConnectionTypes_values"
    android:defaultValue="@string/pref_syncConnectionTypes_default" />

阅读here

按下时不会触发SwitchPreference

2 个答案: