clearAndNavigate(screen) {
    this.props.navigation.dispatch(
      NavigationActions.reset({
        index: 0,
        actions: [
          NavigationActions.navigate({ routeName: screen })
        ]
      })
    );
  }

  componentWillMount() {
    this.CheckUserLogin()
  }

  async CheckUserLogin() {
    let user = await AsyncStorage.getItem('dataLogin')
    if (user !== null) {
      console.log(user)
      this.clearAndNavigate('Home')
    } else {
      this.setState({
        isLoading: false
      })
    }
  }

//for login\\\
 LoginUser = () =>{
    if (this.state.email == "") {
      ToastAndroid.show('Email can not be empty', ToastAndroid.SHORT)
    } else if (this.state.password == "") {
      ToastAndroid.show('Password can not be empty', ToastAndroid.SHORT)
    } else {
      this.setState({
        loading: false
      })
      axios({
        method: 'POST',
        url:    'http://192.168.214.2/Auth/user',
        data:   {
          email     : this.state.email,
          password  : this.state.password
        },
      }).then(response => {
        if (response.data.status) {
          ToastAndroid.show('Welcome', ToastAndroid.SHORT)
          // this.storageAsyncStorage(response.data)
            // this.clearAndNavigate('Home')
            AsyncStorage.setItem('dataLogin', JSON.stringify(response.data))
          console.log(response.data);
        }else{
          ToastAndroid.show('Email Atau Password salah', ToastAndroid.SHORT)
          ToastAndroid.showWithGravityAndOffset('Please check your username and password',
          ToastAndroid.LONG,  ToastAndroid.CENTER, 25, 50 );
          console.log(response.data);
          // ToastAndroid.show('sukses', ToastAndroid.SHORT)
        }
      }).catch(err => {
        this.setState({
          loading : false
        })
      })
        Keyboard.dismiss()
      }
    }