How do I programmatically add EditTextPreferences to my PreferenceFragment?

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北荒
北荒 2021-02-15 14:36

I am new to Android, so I need a little guidance on how to programmatically add EditTextPreference objects to my PreferenceFragment

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3条回答
  • 2021-02-15 14:59

    You can add preferences, e.g. EditTextPreference, CheckBox, etc, programmatically in the "onCreate" method of the PreferenceFragment.

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    
        // Load "dummy" (empty) preferences from an XML resource
        addPreferencesFromResource(R.xml.preferences_channelconfig);
    
        PreferenceScreen screen = this.getPreferenceScreen(); // "null". See onViewCreated.
    
        // Create the Preferences Manually - so that the key can be set programatically.
        PreferenceCategory category = new PreferenceCategory(screen.getContext());
        category.setTitle("Channel Configuration");
        screen.addPreference(category);
    
        CheckBoxPreference checkBoxPref = new CheckBoxPreference(screen.getContext());
        checkBoxPref.setKey(channelConfig.getName() + "_ENABLED");
        checkBoxPref.setTitle(channelConfig.getShortname() + "Enabled");
        checkBoxPref.setSummary(channelConfig.getDescription());
        checkBoxPref.setChecked(channelConfig.isEnabled());
    
        category.addPreference(checkBoxPref);
    }
    

    The crucial step is the addPreferencesFromResource(...), with a dummy xml to attach an empty PreferenceScreen to the fragment. Without this, there is no "top-level Preference that is the root of a Preference hierarchy", thus this.getPreferenceScreen() returns Null.

    The XML I used was just:

    <?xml version="1.0" encoding="utf-8"?>
    <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
        android:orderingFromXml="true">
    
    </PreferenceScreen>
    

    Hope that helps someone.

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  • 2021-02-15 15:06

    Here is the code to create a PreferenceFragment programmatically:

    public class MyPreferenceFragment extends PreferenceFragment {
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
    
            PreferenceScreen screen = getPreferenceManager().createPreferenceScreen(getActivity());
            setPreferenceScreen(screen);
    
            EditTextPreference preference = new EditTextPreference(screen.getContext());
            preference.setKey("EditTextPreference");
            preference.setTitle("Edit Text Preference");
            preference.setSummary("Click the preference to edit text.");
            screen.addPreference(preference);
        }
    }
    
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  • 2021-02-15 15:07

    I don't know if it works in the onCreateView method but it does in the onViewCreated. Here is my code (Inside a subclass of PreferenceFragment):

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
    
        this.getPreferenceScreen().addPreference(new EditTextPreference(getActivity()));
    }
    
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