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ToastAndroid

本模块将原生的 ToastAndroid 模块导出为一个 JS 模块，用于在 Android 设备上显示一个悬浮的提示信息。本模块包含一个show方法接受以下的参数：

  1. String message: 一个字符串，表示将要显示的文本内容。
  2. int duration: 提示信息持续显示的时间。可以是ToastAndroid.SHORT或者ToastAndroid.LONG。

还有一个名为showWithGravity的方法可以指定弹出的位置。可选项有：ToastAndroid.TOP, ToastAndroid.BOTTOM, ToastAndroid.CENTER.

The 'showWithGravityAndOffset' function adds on the ability to specify offset These offset values will translate to pixels.

用法示例：

import { ToastAndroid } from 'react-native'; 

ToastAndroid.show("A pikachu appeared nearby !", ToastAndroid.SHORT);
ToastAndroid.showWithGravity(
  "All Your Base Are Belong To Us",
  ToastAndroid.SHORT,
  ToastAndroid.CENTER
);
ToastAndroid.showWithGravityAndOffset(
  "A wild toast appeared!",
  ToastAndroid.LONG,
  ToastAndroid.BOTTOM,
  25,
  50
);

进阶用法:

The ToastAndroid API is imperative and this might present itself as an issue, but there is actually a way(hack) to expose a declarative component from it. See an example below:

import React, { Component } from 'react';
import {
  View,
  Button,
  ToastAndroid,
} from 'react-native';

// a component that calls the imperative ToastAndroid API
const Toast = (props) => {
  if (props.visible) {
    ToastAndroid.showWithGravityAndOffset(
      props.message,
      ToastAndroid.LONG,
      ToastAndroid.BOTTOM,
      25,
      50
    );
    return null;
  }
  return null;
};

class App extends Component {
  constructor(props) {
    super(props);
    this.state = {
      visible: false,
    };
  }
   handleButtonPress = () => {
    this.setState({
        visible: true,
    }, () => {
      this.hideToast();
    });
  };
   hideToast = () => {
    this.setState({
      visible: false
    })
  }
   render() {
    return (
      <View style={styles.container}>
        <Toast
          visible={this.state.visible}
          message="Example"
        />
        <Button title="Toggle Modal" onPress={this.handleButtonPress} />
      </View>
    );
  }
}

文档

方法

show()

static show(message, duration)

showWithGravity()

static showWithGravity(message, duration, gravity)

showWithGravityAndOffset()

static showWithGravityAndOffset(message, duration, gravity, xOffset, yOffset)

属性

SHORT

Indicates the duration on the screen.

ToastAndroid.SHORT;

LONG

Indicates the duration on the screen.

ToastAndroid.LONG;

TOP

Indicates the position on the screen.

ToastAndroid.TOP;

BOTTOM

Indicates the position on the screen.

ToastAndroid.BOTTOM;

CENTER

Indicates the position on the screen.

ToastAndroid.CENTER;
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