标签: react-native-android

对于我的本机安卓应用程序,我写的代码大小只有12KB

但是生成的包大小为7.9MB.我怎么能减少这一点.

根据本地的反应文档,我已经在文件中找到了proguard app_root/android/app/proguard-rules.pro但是大小并没有减少

...
android {
    ...
    buildTypes {
        release {
            ...
            minifyEnabled true
        }
    }
}
...

有没有可用的解决方案？

我有一个简单的应用程序，渲染后几秒钟即可播放声音。

一切正常，除了如果我锁定屏幕，应用程序将不会播放声音，直到我再次将其解锁。

这是我正在使用的简化版本：

import React, { Component, PropTypes } from 'react';
import { View, Text } from 'react-native';

import Sound from 'react-native-sound'; //for the bell sound

class SoundTest extends Component {

  componenWillMount(){
    setTimeout(this.playSound(), 5000);
  }

  playSound() {
      let s = new Sound('bell.wav','', (e) => {
        if (e) {
          console.log('error', e);
        } else {
          console.log('duration', s.getDuration());
          s.play();
        }
      });
  }

  render() {
    return (
      <View>
        <Text>Hear some sound after a few!</Text>
      </View>
    )
  }
}

AppRegistry.registerComponent('SoundTest', () => SoundTest);

// Works …

我正试图检测应用程序何时获得焦点(即从另一个应用程序切换到它)以执行某项任务.有没有办法在React Native中检测到这个？

我正在做的是将文件复制到临时位置,用外部查看器打开它,然后我想在用户从应用程序切换回来时删除该文件.

输入的占位符是绿色，但我也想输入绿色的文本（当我键入文本时，文本颜色显示为黑色，这在我的UI中不够明显）。我如何也可以使其绿色？

我是React Native的新手。在开发本机模块时，我遇到了回调问题。以下是来自React Native的错误消息

02-05 17:43:26.387 32301-32570/com.awesomeproject2 E/ReactNativeJNI: Got JS Exception: Exception calling object as function: abc,function f1() {
                                                                               _ToastExample2.default.show('1111', _ToastExample2.default.SHORT);
                                                                             },72,73 is not usable as a native method argument (<unknown file>:1845)
02-05 17:43:26.387 32301-32570/com.awesomeproject2 E/ReactNativeJNI: Got JS Stack: invariant@http://localhost:8081/index.delta?platform=android&dev=true&minify=false:1838:26
                                                                     enqueueNativeCall@http://localhost:8081/index.delta?platform=android&dev=true&minify=false:2259:20
                                                                     fn@http://localhost:8081/index.delta?platform=android&dev=true&minify=false:1999:40
                                                                     onBtnPress@http://localhost:8081/index.delta?platform=android&dev=true&minify=false:58362:32
                                                                     proxiedMethod@http://localhost:8081/index.delta?platform=android&dev=true&minify=false:34324:37
                                                                     proxiedMethod@[native code]
                                                                     touchableHandlePress@http://localhost:8081/index.delta?platform=android&dev=true&minify=false:37170:47
                                                                     touchableHandlePress@[native code]
                                                                     _performSideEffectsForTransition@http://localhost:8081/index.delta?platform=android&dev=true&minify=false:36821:36
                                                                     _performSideEffectsForTransition@[native code]
                                                                     _receiveSignal@http://localhost:8081/index.delta?platform=android&dev=true&minify=false:36754:46
                                                                     _receiveSignal@[native code]
                                                                     touchableHandleResponderRelease@http://localhost:8081/index.delta?platform=android&dev=true&
02-05 17:43:26.393 32301-32570/com.awesomeproject2 E/unknown:ReactNative: Exception in native call
                                                                          java.lang.RuntimeException: Error calling RCTEventEmitter.receiveTouches
                                                                              at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method)
                                                                              at android.os.Handler.handleCallback(Handler.java:739)
                                                                              at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                              at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:31)
                                                                              at android.os.Looper.loop(Looper.java:135)
                                                                              at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(MessageQueueThreadImpl.java:194) …

我需要在本机反应中实现AutoCompleteTextView。问题是没有这样的内置组件。可以用来模拟此功能的所有模块和库并不完全相似。主要问题是建议未出现在视图上方（例如选择框/选择器的建议）。即使是那样，它与KeyboardAvoidingView的表现也不完美。整个问题是它不能像Android的本机AutoCompleteTextView一样工作

另一种解决方案是使用本机UI元素。但是我想要这个组件同时适用于iOS和Android。任何帮助，将不胜感激。

我想实现此选项，例如在Facebook应用上标记用户

PS：对不起，我正在使用移动设备时输入错误。

我无法创建以相同方向嵌套在FlatList内的FlatList；

结果是父级是水平的，而子级是垂直的；

这是我的代码：

renderSlides(question) {
                return <View key={question.item.code}
                             style={{flex: 1,width:350}}>
                    <FlatList
                        ref='scrollPick'
                        data={[{k:'A'},{k:'b'},{k:'c'}}]}
                        horizontal={true}
                        renderItem={(rate)=>{return (
                            <View >
                                <Text>{rate.item.k}</Text>
                            </View>);}}
                        keyExtractor={ (item, index) => index}
                    />
                </View>;

            }


render() {
        return (
            <View style={CONTAINERS.MAIN_COLUMN_BLUE}>
                <View style={[NAV.CONTAINER_GENERAL, NAV.CONTAINER_ASSESSMENT, {flex: 1}]}>
                    <TopBar barType="ex" title={I18n.t('assessment.title')} navigator={this.props.navigator}
                            closeFunction={this.handleClose}></TopBar>
                </View>
                <FlatList
                    ref={(ref) => { this.flatListRef = ref; }}
                    horizontal={true}
                    data={[{k:'1'},{k:'2'},{k:'3'},{k:'4'},{k:'5'},{k:'6'},{k:'q'}]}
                    renderItem={this.renderSlides}
                    keyExtractor={(item, index) => index}
                    horizontal={true}
                    getItemLayout={this.getItemLayout}
                    contentContainerStyle={{ flexGrow: 1}}
                />
            </View>
        );
    }
}

有人遇到过同样的问题吗？ （而且我不能使用scrollView）

我在React Native Android项目上工作，但我被卡在这个错误上

> Task :app:transformDexArchiveWithExternalLibsDexMergerForDebug FAILED

D8: Program type already present: androidx.versionedparcelable.NonParcelField    

FAILURE: Build failed with an exception.

我试图在build.gradle中将multi dex更改为false

  defaultconfig {...
    multiDexEnabled false 
     ...}

我不想迁移到androidx，我只想摆脱androidx＆这个错误; 请帮助我，在此先感谢

I just run below steps
1. git clone https://mycaccount@bitbucket.org/somename/appname.git
2.git checkout developer
3.git pull origin
4.get checkout mynewbrange
5. react-native run-android

This project is working in other 4 developers pc and they are using mac
I am using in windows 8 but when i run run-android commant it is not working
and i don't share any code because i guss this is some confoguration issue any one please help to solve this issue
if you need to view code then …

我可以运行我的本机项目。工作正常。我已经通过使用react-native运行进行了测试。但是，当我尝试在Android Studio中运行它时，出现以下错误。

*FAILURE: Build failed with an exception.
* Where:
Script 'D:\EmployeeApp\EmployeeMobileAppGit\employeemobile-app\node_modules\@react-native-community\cli-platform-android\native_modules.gradle' line: 195
* What went wrong:
A problem occurred evaluating settings 'employeeMobile'.
> Unable to determine the current character, it is not a string, number, array, or object

  The current character read is 'E' with an int value of 69
  Unable to determine the current character, it is not a string, number, array, or object
  line number 1
  index number 0
  Error: EPERM: operation not permitted, scandir 'D:/EmployeeApp/EmployeeMobileAppGit/employeemobile-app/android/app/build/intermediates/signing_config/debug/out/signing-config.json' …