Alert prompt is showing every time i edit my text input field in react native

I need quick help, please. When I put an invalid email and hit enter it shows me in the alert prompt that email is invalid but Whenever I am typing in my text box to correct my email the alert prompt is showing every time. I need to get rid of these. please, somebody, help me.

<View style={styles.inputContainer}>
            <TextInput
              autoCapitalize="none"
              autoCompleteType="off"
              autoCorrect={false}
              value={username}
              onChangeText={(text) => this.setState({username: text})}
              placeholder="Email"
              underlineColorAndroid="transparent"
              style={styles.textInput}></TextInput>
          </View>

The error alert prompt code

 <View>{this.state.error ? Alert.alert('Email invalid') : null}</View>