React Native常见报错
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一。 Failed run android simulator : No connected devices!
When you have the platform, and the device, you can then boot the device with emulator:
$ emulator -avd <name>
eg: emulator -avd React_API22
Once booted, the command you were likely trying to run react-native run-android
should produce the effect of a react mobile app running in your emulator window.
二。ReactNative经典报错
解决办法:
1.
注意Android5.0以上版本命令方式:
class HelloAndroid extends Component { render() { return ( <View style={styles.container}> <Text style={styles.welcome}> Welcome to React Native! </Text> <Text style={styles.instructions}> To get started, edit index.android.js </Text> <Text style={styles.instructions}> Shake or press menu button for dev menu </Text> </View> ); }}
3. RN 需要启动一个 Dev server 来辅助开发,Android 5.0 可以直接通过 USB 的访问,5.0 以下只能通过 WiFi 来访问。
adb reverse was introduced in Android 5.0。Please provide alternative solution.
解决办法:
- Press the device Menu button
- Select Dev Settings
- Select Debug server host for device
- Type in your machine's IP and Reload JS (it was 192.168.1.100:8081 for me)
4.has not been registered.
http://www.jianshu.com/p/82a09063e61c
但是,还有一种情况!
即便你确保一致了但还是出现相同的错误提示,这又是怎么搞得呢?这个时候你可以检查一下你的命令行。有可能你同时在运行一个以上的程序,像我。如果你的react-native在运行程序A而你打开了程序B,也会出现相同的问题。解决方法很简单,关掉命令行运行程序。
我遇到了你文中所说的后者那个问题,没有关掉上一个项目运行所开的终端。5. null is not an object
显示null is not an object (evaluating '_this3._pressRow')
,上图:
一看就知道是找不到方法,后来查阅这个资料,知道了解决方法,原来renderRow要与外面的this绑定起来,这个跟Android里的上下文环境Context很像:
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