>npm install react-redux
>npm install redux

import React from 'react';
import { StyleSheet, Text, View , TouchableOpacity ,Button ,TextInput} from 'react-native';

export default class App extends React.Component {

  constructor(props){
    super(props)
    this.state = {
      count: 0,
      name:'hogehoge'
    };
  }

  pressPlus(e){
    this.setState({count:this.state.count+1})
  }

  pressMinuss(e){
    this.setState({count:this.state.count-1})
  }


  changeName(e){
    this.setState(({name:e}))
  }


  render() {
    return (
      <View style={styles.view}>
        <Text>Redux Sample</Text>

        <TouchableOpacity style={styles.button} onPress={(e)=>this.pressPlus(e)} >
          <Text>count plus</Text>
        </TouchableOpacity>

        <TouchableOpacity style={styles.button} onPress={(e)=>this.pressMinuss(e)} >
          <Text>count minus</Text>
        </TouchableOpacity>

          <TextInput          
            style={styles.input} 
            onChangeText={(e)=>this.changeName(e)}>
          {this.state.name}
          </TextInput>

        <Text>count:{this.state.count}</Text>
        <Text>name:{this.state.name}</Text>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  view:{
    flex: 1, 
    alignItems: 'center', 
    justifyContent: 'center',
    margin:10,
  },
  button: {
    width: 200,
    height: 40,
    margin: 5 ,
    backgroundColor: 'lightblue',
    justifyContent: 'center',
    alignItems: 'center',
  },
  input: {
    width: 200,
    height: 40,
    margin: 5 ,
    backgroundColor: '#f5f5f5',
    borderColor : 'black',
    justifyContent: 'center',
    alignItems: 'center',
  },
}

);

Invariant Violation: Could not find “store” in the context of “Connect(App)”. Either wrap the root component in a <Provider>, or pass a custom React context provider to <Provider> and the corresponding React context consumer to Connect(App) in connect options.

reducerを元にstoreを生成する
const store = createStore(rootReducer); (1)