duvida.js

  var ImagePicker = require('react-native-image-picker');

  // More info on all the options is below in the README...just some common use cases shown here
  var options = {
    title: 'Alterar Perfil',
    cancelButtonTitle:'Cancelar',
    takePhotoButtonTitle:'Tirar foto',
    chooseFromLibraryButtonTitle:'Escolher foto',
    storageOptions: {
      skipBackup: true
    }
  };

  /**
   * The first arg is the options object for customization (it can also be null or omitted for default options),
   * The second arg is the callback which sends object: response (more info below in README)
   */
  () ImagePicker.showImagePicker(options, (response) => {
    console.log('Response = ', response);

    if (response.didCancel) {
      console.log('User cancelled image picker');
    }
    else if (response.error) {
      console.log('ImagePicker Error: ', response.error);
    }
    else if (response.customButton) {
      console.log('User tapped custom button: ', response.customButton);
    }
    else {
      let source = { uri: response.uri };

      // You can also display the image using data:
      // let source = { uri: 'data:image/jpeg;base64,' + response.data };

      this.setState({
        avatarSource: source
      });
    }
  });