SharedPreferences偏好設置

SharedPreferences偏好設置的使用

保存基本數據類型：

1，保存數據

 */
	public static void setParam(Context context, String key, Object object,
			boolean isClear) {

		String type = object.getClass().getSimpleName();
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
		SharedPreferences.Editor editor = sp.edit();

		if (isClear) {
			editor.clear();
		}

		if ("String".equals(type)) {
			editor.putString(key, (String) object);
		} else if ("Integer".equals(type)) {
			editor.putInt(key, (Integer) object);
		} else if ("Boolean".equals(type)) {
			editor.putBoolean(key, (Boolean) object);
		} else if ("Float".equals(type)) {
			editor.putFloat(key, (Float) object);
		} else if ("Long".equals(type)) {
			editor.putLong(key, (Long) object);
		}

		editor.commit();
	}

2，獲取數據

public static Object getParam(Context context, String key,
			Object defaultObject) {
		String type = defaultObject.getClass().getSimpleName();
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);

		if ("String".equals(type)) {
			return sp.getString(key, (String) defaultObject);
		} else if ("Integer".equals(type)) {
			return sp.getInt(key, (Integer) defaultObject);
		} else if ("Boolean".equals(type)) {
			return sp.getBoolean(key, (Boolean) defaultObject);
		} else if ("Float".equals(type)) {
			return sp.getFloat(key, (Float) defaultObject);
		} else if ("Long".equals(type)) {
			return sp.getLong(key, (Long) defaultObject);
		}

		return null;
	}

對象複雜類型的數據保存處理：

將對象轉換成對象數組，然後轉換成String，將String數據加密，保存

1，保存數據

public static void setObject(Context context, String key, Object object) {
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);

		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		ObjectOutputStream out = null;
		try {

			out = new ObjectOutputStream(baos);
			out.writeObject(object);
			String objectVal = new String(Base64.encode(baos.toByteArray(),
					Base64.DEFAULT));
			Editor editor = sp.edit();
			editor.putString(key, objectVal);
			editor.commit();

		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				if (baos != null) {
					baos.close();
				}
				if (out != null) {
					out.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

2，獲取數據

string解密，然後讀取對象數組

public static <T> T getObject(Context context, String key, Class<T> clazz) {
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
		if (sp.contains(key)) {
			String objectVal = sp.getString(key, null);
			byte[] buffer = Base64.decode(objectVal, Base64.DEFAULT);
			ByteArrayInputStream bais = new ByteArrayInputStream(buffer);
			ObjectInputStream ois = null;
			try {
				ois = new ObjectInputStream(bais);
				T t = (T) ois.readObject();
				return t;
			} catch (StreamCorruptedException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			} catch (ClassNotFoundException e) {
				e.printStackTrace();
			} finally {
				try {
					if (bais != null) {
						bais.close();
					}
					if (ois != null) {
						ois.close();
					}
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return null;
	}