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 runreact-native run-androidshould produce the effect of a react mobile app running in your emulator window.

二。ReactNative经典报错

解决办法：

1.

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：

1. Press the device Menu button
2. Select Dev Settings
3. Select Debug server host for device
4. 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。

5.null is not an object

<ListView 
                    contentContainerStyle = {styles.list}
                    pageSize={2}
                    dataSource = {this.state.dataSource}
                    renderRow={this._renderRow.bind(this)}
                />