小编amo*_*new的帖子

普通通知生成器不会在Android O上显示通知.

如何在Android 8 Oreo上显示通知？

是否有任何新代码要添加以在Android O上显示通知？

Android Studio 是否可以在带有 arm 芯片 ARM（新 Mac 设备）的 Apple 上运行？

我用这个库得到了这个错误https://github.com/react-native-web-community/react-native-web-linear-gradient/

错误链接https://github.com/react-native-web-community/react-native-web-linear-gradient/issues/1错误 详情:模块解析失败:意外令牌(5:22)您可能需要适当的加载器来处理这种文件类型.

我的网站:

'use strict';

const autoprefixer = require('autoprefixer');
const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CaseSensitivePathsPlugin = require('case-sensitive-paths-webpack-plugin');
const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
const WatchMissingNodeModulesPlugin = require('react-dev-utils/WatchMissingNodeModulesPlugin');
const eslintFormatter = require('react-dev-utils/eslintFormatter');
const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');
const getClientEnvironment = require('./env');
const paths = require('./paths');

const publicPath = '/';
const publicUrl = '';
const env = getClientEnvironment(publicUrl);

module.exports = {
  devtool: 'cheap-module-source-map',
  entry: [
    require.resolve('./polyfills'),
    require.resolve('react-dev-utils/webpackHotDevClient'),
    paths.appIndexJs,
  ],
  output: {
    pathinfo: true, …

在React Native Navigation库中'react-navigation'

我如何通过AsyncStorage设置StackNavigator initialRouteName？

function getInitialScreen() {
    AsyncStorage.getItem('initialScreen')
        .then(screenName => {
            return (screenName)
                ? screenName
                : 'Login';
        })
        .catch(err => {});
}

const Navigator = StackNavigator({
    Splash: { screen: Splash },
    Login: { screen: Login },
    WebPage: { screen: WebPage }
}, {
    initialRouteName: getInitialScreen()
});

我正在使用React Native Web库，但是我无法在Web上全高

码：

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

class index extends React.Component {

    render() {
        return (
            <View style={styles.container}>

                <TouchableOpacity
                    style={{
                    backgroundColor: 'blue'
                }}>
                    <Text style={{
                        color: 'green'
                    }}>Learning</Text>
                </TouchableOpacity>
            </View>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        width: '100%',
        height: '100%',
        margin: 0,
        padding: 0,
        justifyContent: 'center',
        alignItems: 'center',
        backgroundColor: 'red'
    }
})

export default index;

chrome浏览器的结果：

我想将React应用程序文件放在React Native应用程序中。

我使用React Native Web在React应用程序中支持React Native组件。

最后一步，我想将所有文件从React App文件夹放到React Native App文件夹。

区别在于Package.json

反应Package.json：

{
  "name": "appname",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "react": "^15.6.1",
    "react-dom": "^15.6.1",
    "react-scripts": "1.0.10"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test --env=jsdom",
    "eject": "react-scripts eject"
  }
}

反应本机Package.json：

{
    "name": "appname",
    "version": "0.0.1",
    "private": true,
    "scripts": {
        "start": "node node_modules/react-native/local-cli/cli.js start",
        "test": "jest"
    },
    "dependencies": {
        "react": "16.0.0-alpha.12",
        "react-native": "0.47.1",
        "react-native-windows": "0.47.0-rc.5"
    },
    "devDependencies": {
        "babel-jest": "20.0.3",
        "babel-preset-react-native": "2.1.0",
        "jest": …

如何在 Flutter 中获取所有硬编码字符串？

在 Android 中，我可以通过 Lint Inspection 获得它，但是在 Flutter 中是否有类似的东西？

我在 Flutter Repo 上开了一个 issue：https : //github.com/flutter/flutter/issues/42227

我想在谷歌地图标记上显示用户图像，但我不知道该怎么做？

在这里检查我想要的结果：

标记图像：

我想要的结果：

非常感谢

我第一次启动应用程序时发生崩溃

KVO_IS_RETAINING_ALL_OBSERVERS_OF_THIS_OBJECT_IF_IT_CRASHES_AN_OBSERVER_WAS_OVERRELEASED_OR_SMASHED

但当我第二次打开应用程序时，它没有崩溃

Firebase Crashlytics 日志：

Crashed: com.apple.main-thread
0  libobjc.A.dylib                0x1fa2d7dac object_isClass + 16
1  Foundation                     0x1fbb7fbd8 KVO_IS_RETAINING_ALL_OBSERVERS_OF_THIS_OBJECT_IF_IT_CRASHES_AN_OBSERVER_WAS_OVERRELEASED_OR_SMASHED + 68
2  Foundation                     0x1fbb7d36c NSKeyValueWillChangeWithPerThreadPendingNotifications.llvm.6024598272766318604 + 304
3  AVFoundation                   0x201146074 __avplayeritem_fpItemNotificationCallback_block_invoke + 5800
4  libdispatch.dylib              0x1fab436c8 _dispatch_call_block_and_release + 24
5  libdispatch.dylib              0x1fab44484 _dispatch_client_callout + 16
6  libdispatch.dylib              0x1faaf09ec _dispatch_main_queue_callback_4CF$VARIANT$mp + 1068
7  CoreFoundation                 0x1fb09a1bc __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
8  CoreFoundation                 0x1fb095084 __CFRunLoopRun + 1964
9  CoreFoundation                 0x1fb0945b8 CFRunLoopRunSpecific + 436
10 GraphicsServices               0x1fd308584 GSEventRunModal + 100
11 UIKitCore                      0x227adb558 UIApplicationMain + 212 …

我希望Flutter中的文本小部件具有默认字体大小。我知道我可以在主题中设置默认字体系列，但是没有默认字体大小参数。

我只是想知道我的自定义窗口小部件是否实施正确，还是我做错了方法？

import 'package:flutter/material.dart';

/// Custom Text with a default font Monospace and a default font size.
class CustomText extends Text {
  /// Custom Text Constructor extend of Text constructor.
  CustomText(this.dataCustom,
      {this.styleCustom = const TextStyle(), this.textAlignCustom})
      : super(dataCustom,
            style: styleCustom.copyWith(fontFamily: 'Monospace', fontSize: 12),
            textAlign: textAlignCustom);

  /// The text to display.
  ///
  /// This will be null if a [textSpan] is provided instead.
  final String dataCustom;

  /// If non-null, the style to use for this text.
  ///
  /// If the style's …

我无法理解 runZonedGuarded 用法的 crashlytics 文档

那我到底需要还是不需要呢？

https://firebase.flutter.dev/docs/crashlytics/usage/#zoned-errors

我可以改善我的代码，并用array.map代替for-loop吗？

我搜索了一下，我想我可以这样做，但是我没有找到如何应用的方法。

这是我发现的：

var result = arr.map(person => ({ value: person.id, text: person.name }));

我的代码在这里：

  public getFlights(): Observable<RowItem[]> {
    return this.http
      .get(this.apiHostFlights)
      .map((res: any) => {
        return <LocationModelItem[]>res.json();
      })
      .map((items: LocationModelItem[]) => {
        var rowItems: RowItem[]=[];
        var cachedLenght = items.length;
        for (var i = 0; i < cachedLenght; i++) {
          rowItems.push(
            new RowItem(i, items[i].name, items[i].img, items[i].category)
          );
        }
        return rowItems;
      })
      .catch((error: any) => {
        return Observable.throw(error.statusText);
      });
  }