SharedPreferences工具类

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<pre name="code" class="java">/**  * SharedPreferences工具类， *  * @author yangzc * *2015-3-27 下午3:30:12 */public class SharedPreferencesUtils {  /** * 保存在手机里的文件名 */public static final String FILE_NAME = "tianler_data";/** * 保存数据 * @param context 上下文 * @param key key * @param obj value */public static void put(Context context,String key,Object obj){SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);Editor editor = sp.edit();if(obj instanceof Boolean){editor.putBoolean(key, (Boolean)obj);}else if(obj instanceof Float){editor.putFloat(key, (Float)obj);}else if(obj instanceof Integer){editor.putInt(key, (Integer)obj);}else if(obj instanceof Long){editor.putLong(key, (Long)obj);}else{editor.putString(key, (String)obj);}editor.commit();}/** * 获取指定的数据 * @param context * @param key * @param defaultObj * @return */public static Object get(Context context,String key,Object defaultObj){SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);if(defaultObj instanceof Boolean){return sp.getBoolean(key, (Boolean)defaultObj);}else if(defaultObj instanceof Float){return sp.getFloat(key, (Float)defaultObj);}else if(defaultObj instanceof Integer){return sp.getInt(key, (Integer)defaultObj);}else if(defaultObj instanceof Long){return sp.getLong(key, (Long)defaultObj);}else if(defaultObj instanceof String){return sp.getString(key, (String)defaultObj);}return null;}/** * 删除指定的数据 * @param key */public static void remove(Context context,String key){SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);Editor editor = sp.edit();editor.remove(key);editor.commit();}/** * 返回所有的键值对 * @return */public static Map<String,?> getAll(Context context){SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);Map<String,?> map = sp.getAll();return map;}/** * 清除所有数据 * @param context */public static void clear(Context context){SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);Editor editor = sp.edit();editor.clear();editor.commit();}/** * 检查是否存在此key对应的数据 * @param context * @param key * @return */public static boolean contains(Context context,String key){SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);return sp.contains(key);}}

还可以吧sp存在一个config当中，方便跨Activity使用：

Activity1当中：

String newname = et_name.getText().toString().trim();
SharedPreferences sp = getSharedPreferences("config",
MODE_PRIVATE);
Editor editor = sp.edit();
editor.putString("newname", newname);
editor.commit();

Activity2当中：

String newname = sp.getString("newname", "");
if (!TextUtils.isEmpty(newname)) {
tv_homeitem_name.setText(newname);
}

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