Android之SharedPreferences两个工具类

Posted 2020-07-08 星辰

     相信Android的这个最简单的存储方式大家都很熟悉了，但是有一个小小技巧，也许你没有用过，今天就跟大家分享一下，我们可以把SharedPreferences封装在一个工具类中，当我们需要写数据和读数据的时候，就可以直接通过工具类的set和get方法来完成，类似JavaBean，这样使用起来就比较方便，快捷（建议项目中使用次数比较多使用）。好了，直接看看这段简单的代码吧：

public class SharePreferenceUtil {
    private SharedPreferences sp;
    private SharedPreferences.Editor editor;

    public SharePreferenceUtil(Context context, String file) {
        sp = context.getSharedPreferences(file, context.MODE_PRIVATE);
        editor = sp.edit();
    }

    // 用户的密码
    public void setPasswd(String passwd) {
        editor.putString("passwd", passwd);
        editor.commit();
    }

    public String getPasswd() {
        return sp.getString("passwd", "");
    }

    // 用户的id，即QQ号
    public void setId(String id) {
        editor.putString("id", id);
        editor.commit();
    }

    public String getId() {
        return sp.getString("id", "");
    }

    // 用户的昵称
    public String getName() {
        return sp.getString("name", "");
    }

    public void setName(String name) {
        editor.putString("name", name);
        editor.commit();
    }

    // 用户的邮箱
    public String getEmail() {
        return sp.getString("email", "");
    }

    public void setEmail(String email) {
        editor.putString("email", email);
        editor.commit();
    }

    // 用户自己的头像
    public Integer getImg() {
        return sp.getInt("img", 0);
    }

    public void setImg(int i) {
        editor.putInt("img", i);
        editor.commit();
    }

    // ip
    public void setIp(String ip) {
        editor.putString("ip", ip);
        editor.commit();
    }

    public String getIp() {
        return sp.getString("ip", Constants.SERVER_IP);
    }

    // 端口
    public void setPort(int port) {
        editor.putInt("port", port);
        editor.commit();
    }

    public int getPort() {
        return sp.getInt("port", Constants.SERVER_PORT);
    }

    // 是否在后台运行标记
    public void setIsStart(boolean isStart) {
        editor.putBoolean("isStart", isStart);
        editor.commit();
    }

    public boolean getIsStart() {
        return sp.getBoolean("isStart", false);
    }

    // 是否第一次运行本应用
    public void setIsFirst(boolean isFirst) {
        editor.putBoolean("isFirst", isFirst);
        editor.commit();
    }

    public boolean getisFirst() {
        return sp.getBoolean("isFirst", true);
    }
}

第二种方法是更加简单方便：取值时只用传入context和对应的key，就能获取到对应的value；设值时，也是传入context和对应key和value即可，非常方便实用。

public class PreferenceUtils {
    public static String getPrefString(Context context, String key,
            final String defaultValue) {
        final SharedPreferences settings = PreferenceManager
                .getDefaultSharedPreferences(context);
        return settings.getString(key, defaultValue);
    }

    public static void setPrefString(Context context, final String key,
            final String value) {
        final SharedPreferences settings = PreferenceManager
                .getDefaultSharedPreferences(context);
        settings.edit().putString(key, value).commit();
    }

    public static boolean getPrefBoolean(Context context, final String key,
            final boolean defaultValue) {
        final SharedPreferences settings = PreferenceManager
                .getDefaultSharedPreferences(context);
        return settings.getBoolean(key, defaultValue);
    }

    public static boolean hasKey(Context context, final String key) {
        return PreferenceManager.getDefaultSharedPreferences(context).contains(
                key);
    }

    public static void setPrefBoolean(Context context, final String key,
            final boolean value) {
        final SharedPreferences settings = PreferenceManager
                .getDefaultSharedPreferences(context);
        settings.edit().putBoolean(key, value).commit();
    }

    public static void setPrefInt(Context context, final String key,
            final int value) {
        final SharedPreferences settings = PreferenceManager
                .getDefaultSharedPreferences(context);
        settings.edit().putInt(key, value).commit();
    }

    public static int getPrefInt(Context context, final String key,
            final int defaultValue) {
        final SharedPreferences settings = PreferenceManager
                .getDefaultSharedPreferences(context);
        return settings.getInt(key, defaultValue);
    }

    public static void setPrefFloat(Context context, final String key,
            final float value) {
        final SharedPreferences settings = PreferenceManager
                .getDefaultSharedPreferences(context);
        settings.edit().putFloat(key, value).commit();
    }

    public static float getPrefFloat(Context context, final String key,
            final float defaultValue) {
        final SharedPreferences settings = PreferenceManager
                .getDefaultSharedPreferences(context);
        return settings.getFloat(key, defaultValue);
    }

    public static void setSettingLong(Context context, final String key,
            final long value) {
        final SharedPreferences settings = PreferenceManager
                .getDefaultSharedPreferences(context);
        settings.edit().putLong(key, value).commit();
    }

    public static long getPrefLong(Context context, final String key,
            final long defaultValue) {
        final SharedPreferences settings = PreferenceManager
                .getDefaultSharedPreferences(context);
        return settings.getLong(key, defaultValue);
    }

    public static void clearPreference(Context context,
            final SharedPreferences p) {
        final Editor editor = p.edit();
        editor.clear();
        editor.commit();
    }
}