Question

我正在使用偏好设置并面临这样的麻烦：我无法理解为什么在点击首选项按钮onPreferenceClick(Preference preference)时调用方法onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key)的原因我正在更改设置。在类SettingsActivity中它工作正常（我也有一个问题：为什么else语句永远不会是真的？）但是我需要它来通知更改并重新创建我的活动。

班级SettingsActivity：

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.preferences);

        mSharedPreferences = this.getSharedPreferences("Launcher", Context.MODE_PRIVATE);

        Preference clear = findPreference("clear_fav");
        clear.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
            @Override
            public boolean onPreferenceClick(Preference preference) {
                String key = preference.getKey();
                if (key.equals("clear_fav")) {
                    Log.d("tag", "LOL");
                    editor = mSharedPreferences.edit();
                    editor.putBoolean("clearFavourite", true);
                    editor.apply();
                    return true;
                } else {
                    Log.d("tag", "NO LOL");
                    editor = mSharedPreferences.edit();
                    editor.putBoolean("clearFavourite", false);
                    editor.apply();
                }
                return false;
            }
        });
    }
@Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
        int portrait = 0;
        int landscape = 0;
        editor = mSharedPreferences.edit();

        if (sharedPreferences.getString("icons_amount", "").equals("1")) {
            portrait = 4;
            landscape = 6;
        } else if (sharedPreferences.getString("icons_amount", "").equals("2")) {
            portrait = 5;
            landscape = 7;
        }

        if (sharedPreferences.getString("themes", "").equals("1")) {
            editor.putBoolean("theme", true);
        } else if (sharedPreferences.getString("themes", "").equals("2")) {
            editor.putBoolean("theme", false);
        }
        editor.putInt("portrait", portrait);
        editor.putInt("landscape", landscape);
        editor.apply();
    }

在班级MyActivity中：

@Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
        Log.d("tag", "RECREATE from Pref Changed");
        recreate();
    }

    @Override
    public boolean onPreferenceClick(Preference preference) {
        Log.d("tag", "RECREATE from Click");
        recreate();
        return true;
    }
}

preferences.xml：

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

    <SwitchPreference
        android:defaultValue="default_hide"
        android:key="hide_fav"
        android:title="Hide Favourites" />

    <Preference
        android:defaultValue="default_clear_fav"
        android:key="clear_fav"
        android:title="Clear Favourites" />

    <ListPreference
        android:defaultValue="default_icons"
        android:entries="@array/tableListArray"
        android:entryValues="@array/tableListValues"
        android:key="icons_amount"
        android:title="Table" />

    <ListPreference
        android:defaultValue="default_theme"
        android:entries="@array/themeListArray"
        android:entryValues="@array/themeListValues"
        android:key="themes"
        android:title="Theme" />

    <EditTextPreference
        android:key="uri_amount"
        android:title="Uri"/>

    <Preference
        android:defaultValue="default_clear_uri"
        android:key="clear_uri"
        android:title="Clear Uri" />

</PreferenceScreen>

onPreferenceClick（）不是从Activity调用的

0 个答案: