title: how to disable react native picker after selecting an option
body: <p>I want to disable (I do not want to select anything) the picker as soon as I select an option from the dropdown.
  Here is the picker,</p>
  
  <pre><code>&lt;View style={editProfileStyle.pickerView}&gt;
              &lt;Picker
                style={{
                  ...Platform.select({
                    android: {
                      color: "#000"
                    }
                  })
                }}
                enabled={true}
                selectedValue={this.state.Qualification}
                onValueChange={this.updateState}
                mode="dropdown"
                itemStyle={{ height: 80, color: "#000000" }}
              &gt;
                  {this.state.options.map((item, index) =&gt; {
                      return &lt;Picker.Item value={item} key={index} label={item} /&gt;;
                  })}
              &lt;/Picker&gt;
            &lt;/View&gt;
  </code></pre>
  
  <p>Would help a lot if a solution is found!</p>