SharedPreferences工具类

public class SPUtil {
    private static SharedPreferences preferences;
    private static SharedPreferences.Editor editor;
    private static SPUtil spUtil;
    /**
     * 保存在手机里面的名字
     */
    public static String FILE_NAME = "JiLu";

    public static SPUtil getSPUtil(Context context) {
        if(spUtil==null){
            synchronized (SPUtil.class){
                spUtil=new SPUtil();
                preferences = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);
                editor = preferences.edit();
            }
        }
        return spUtil;
    }

    public void putString(String key, String value) {
        editor.putString(key, value);
        editor.commit();
    }

    public void putBoolean(String key, boolean value) {
        editor.putBoolean(key, value);
        editor.commit();
    }

    public void putFloat(String key, float value) {
        editor.putFloat(key, value);
        editor.commit();
    }

    public void putInt(String key, int value) {
        editor.putInt(key, value);
        editor.commit();
    }

    public void putLong(String key, long value) {
        editor.putLong(key, value);
        editor.commit();
    }

    /**
     * 清空SP里所以数据
     */
    public void clear() {
        editor.clear();
        editor.commit();
    }

    /**
     * 删除SP里指定key对应的数据项
     * @param key
     */
    public void remove(String key) {
        editor.remove(key);
        editor.commit();
    }

    /**
     * 获取SP数据里指定key对应的value。如果key不存在，则返回默认值defValue。
     * @param key
     * @param defValue
     * @return
     */
    public String getString(String key, String defValue) {
        return preferences.getString(key, defValue);
    }

    public boolean getBoolean(String key, boolean defValue) {
        return preferences.getBoolean(key, defValue);
    }

    public float getFloat(String key, float defValue) {
        return preferences.getFloat(key, defValue);
    }

    public int getInt(String key, int defValue) {
        return preferences.getInt(key, defValue);
    }

    public long getLong(String key, long defValue) {
        return preferences.getLong(key, defValue);
    }

    /**
     * 判断SP是否包含特定key的数据
     * @param key
     * @return
     */
    public boolean contains(String key){
        return preferences.contains(key);
    }

}