Android Uri.getQueryParameter使用注

/**
     * Searches the query string for the first value with the given key.
     *
     * <p><strong>Warning:</strong> Prior to Jelly Bean, this decoded
     * the '+' character as '+' rather than ' '.
     *
     * @param key which will be encoded
     * @throws UnsupportedOperationException if this isn't a hierarchical URI
     * @throws NullPointerException if key is null
     * @return the decoded value or null if no parameter is found
     */
    public String getQueryParameter(String key)

在Android中操作Uri经常会调用上述方法，可能自己粗心大意，没注意注释，注释上已经说明，返回值是null或者是解码之后的内容。所以通常不需要自己在对返回值进行解码，否则可能引起二次解码带来的问题。