title: Get params from React native Picker selectedvalue
body: <p>i fetch data from the server, and map it so i could put it in a Picker.
  the data is a bunch of users that have 4 attributes each (name,last name, phone, mail).on my picker i display only the name.</p>
  <pre><code>state = {
      value: 'first',
      selectedValue: '',
      data: [],
    };
        .
        .
        .
  &lt;Picker
                  selectedValue={this.state.selectedValue}
                  style={{ height: 30, width: 250 }}
                  onValueChange={(itemValue, itemIndex) =&gt; this.setState({selectedValue:itemValue})} &gt;
                  {this.state.data.map((item, index) =&gt;
                    &lt;Picker.Item label={item.name} value={index} key={index} /&gt;
                  )}
                &lt;/Picker&gt;
  </code></pre>
  <p>My problem is i want to get all the 4 attributes(name,lname,email,phone) of the the selectedvalue  so i could pass them to a new screen but i can't figure out how to do it.could someone please help show me how i could at least consol.log them</p>