Android SharedPreferencesHelper简单封装_android 如何封装一个helper-优快云博客

本文链接：https://blog.youkuaiyun.com/Fy993912_chris/article/details/77370343

本文提供了一个针对SharedPreferences的简单封装类，方便开发者进行数据存储和读取操作。通过初始化和使用该类，可以轻松地保存和获取应用的数据。

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先赌为快：

public class SharedPreferencesHelper {

    private static SharedPreferencesHelper helper;
    private SharedPreferences mSharedPreferences;
    private static SharedPreferences.Editor mEditor;

    private SharedPreferencesHelper(Context context, String baseKeyName) {
        mSharedPreferences = context.getSharedPreferences(baseKeyName, Context.MODE_PRIVATE);
        mEditor = mSharedPreferences.edit();
    }

    public static SharedPreferencesHelper init(Context context, String baseKeyName) {
        if (helper == null) {
            helper = new SharedPreferencesHelper(context.getApplicationContext(), baseKeyName);
        }
        return helper;
    }

    public static SharedPreferencesHelper getHelper() {
        checkNotNull();
        return helper;
    }

    public static SharedPreferences.Editor getEditor() {
        checkNotNull();
        return mEditor;
    }

    public static SharedPreferencesHelper putValue(String key, String value) {
        getEditor().putString(key, value).commit();
        return getHelper();
    }

    public static SharedPreferencesHelper putValue(String key, boolean value) {
        getEditor().putBoolean(key, value).commit();
        return getHelper();
    }

    public static SharedPreferencesHelper putValue(String key, float value) {
        getEditor().putFloat(key, value).commit();
        return getHelper();
    }

    public static SharedPreferencesHelper putValue(String key, long value) {
        getEditor().putLong(key, value).commit();
        return getHelper();
    }

    public static SharedPreferencesHelper putValue(String key, int value) {
        getEditor().putInt(key, value).commit();
        return getHelper();
    }

    public static SharedPreferencesHelper putValue(String key, Set<String> value) {
        getEditor().putStringSet(key, value).commit();
        return getHelper();
    }

    public static <T> T getValue(String key, T defaultValue) {
        return getAll().get(key) == null ? defaultValue : (T) getAll().get(key);
    }

    public static boolean clearAll() {
        return getEditor().clear().commit();
    }

    public static boolean removeValue(String key) {
        return getEditor().remove(key).commit();
    }

    public static Set<String> getSet(String key, Set<String> defValues) {
        return getHelper().mSharedPreferences.getStringSet(key, defValues);
    }

    public static Map<String, ?> getAll() {
        return getHelper().mSharedPreferences.getAll();
    }

    private static void checkNotNull() {
        if (helper == null) {
            throw new ExceptionInInitializerError("Helper未初始化，请在Application中初始化");
        }
    }
}