[置顶] Android之SharedPreferences两个工具类

        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();
	}
}