react-native-navigation/example/src/screens/SecondTabScreen.android.js

import React, {Component} from 'react';
import {
  Text,
  View,
  ScrollView,
  TouchableOpacity,
  StyleSheet
} from 'react-native';

export default class SecondTabScreen extends Component {
  static navigatorStyle = {
    drawUnderTabBar: true
  };
  constructor(props) {
    super(props);
    this.buttonsCounter = 0;
    // if you want to listen on navigator events, set this up
    // this.props.navigator.setOnNavigatorEvent(this.onNavigatorEvent.bind(this));
  }
  render() {
    return (
      <View style={{flex: 1, padding: 20}}>

        <TouchableOpacity onPress={ this.onChangeButtonsPress.bind(this) }>
          <Text style={styles.button}>Change Buttons</Text>
        </TouchableOpacity>

        <TouchableOpacity onPress={ this.onChangeTitlePress.bind(this) }>
          <Text style={styles.button}>Change Title</Text>
        </TouchableOpacity>

        <TouchableOpacity onPress={ this.onSwitchTabPress.bind(this) }>
          <Text style={styles.button}>Switch To Tab#1</Text>
        </TouchableOpacity>

        <TouchableOpacity onPress={ this.onSetTabBadgePress.bind(this) }>
          <Text style={styles.button}>Set Tab Badge</Text>
        </TouchableOpacity>

        <TouchableOpacity onPress={ this.onToggleTabsPress.bind(this) }>
          <Text style={styles.button}>Toggle Tabs</Text>
        </TouchableOpacity>

      </View>
    );
  }
  onChangeTitlePress() {
    this.props.navigator.setTitle({
      title: Math.round(Math.random() * 100000).toString()
    });
  }
  onChangeButtonsPress() {
    let buttons;
    if (this.buttonsCounter % 3 == 0) {
      buttons = [
        {
          title: 'Edit',
          id: 'edit',
          disabled: true
        },
        {
          icon: require('../../img/navicon_add.png'),
          id: 'add'
        }
      ];
    } else if (this.buttonsCounter % 3 == 1) {
      buttons = [{
        title: 'Save',
        id: 'save'
      }];
    } else {
      buttons = [];
    }
    this.buttonsCounter++;

    this.props.navigator.setButtons({
      rightButtons: buttons,
      animated: true
    });
  }
  onSwitchTabPress() {
    this.props.navigator.switchToTab({
      tabIndex: 0
    });
  }
  onSetTabBadgePress() {
    this.props.navigator.setTabBadge({
      badge: 12
    });
  }
  onToggleTabsPress() {
    this.props.navigator.toggleTabs({
      to: this.tabsHidden ? 'shown' : 'hidden'
    });
    this.tabsHidden = !this.tabsHidden;
  }
  onNavigatorEvent(event) {
    // handle a deep link
    if (event.type == 'DeepLink') {
      const parts = event.link.split('/');
      if (parts[0] == 'tab2') {
        this.props.navigator.resetTo({
          title: "Replaced Root",
          screen: parts[1],
          animated: true
        });
        this.props.navigator.switchToTab();
      }
    }
    // handle a button press
    // if (event.type == 'NavBarButtonPress') {
    //   if (event.id == 'edit') {
    //     AlertIOS.alert('NavBar', 'Dynamic Edit button pressed');
    //   }
    //   if (event.id == 'add') {
    //     AlertIOS.alert('NavBar', 'Dynamic Add button pressed');
    //   }
    //   if (event.id == 'save') {
    //     AlertIOS.alert('NavBar', 'Dynamic Save button pressed');
    //   }
    // }
  }
}

const styles = StyleSheet.create({
  button: {
    textAlign: 'center',
    fontSize: 18,
    marginBottom: 10,
    marginTop:10,
    color: 'blue'
  }
});