“react-native run-android” command is not working

Question

I'm new to react native and trying to set up the environment before I start coding. Whenever I try to run the command: 'react-native run-android', it throws an error: Failed to launch emulator. Reason: No emulators found as an output of emulator -list-avds .

I'm following the documentation but still getting the error. How do I fix this?

Answer 1

you should add JAVA_HOME to windows environment variables, try to install Java SE Development Kit (JDK) with Chocolatey or download from https://openjdk.java.net/projects/jdk8/

if doesn't work:

Right click My Computer and select Properties. On the Advanced tab, select Environment Variables, and then edit JAVA_HOME to point to where the JDK software is located, for example, C:\Program Files\Java\jdk1, Apply and close Properties, now it works

Answer 2

you can use AndroidStudio for open emulator, after open emulator you can use react-native run-android , after app installed you can use react-native start for more time.

you most install JDK for run java, and set JAVA_HOME in Environment Variables .

Set the JAVA_HOME Variable To set the JRE_HOME or JAVA_HOME variable:

1.Locate your Java installation directory

If you didn't change the path during installation, it'll be something like C:\Program Files\Java\jdk1.8.0_65

You can also type where java at the command prompt.

2.Do one of the following:

Windows 7 – Right click My Computer and select Properties > Advanced

Windows 8 – Go to Control Panel > System > Advanced System Settings

Windows 10 – Search for Environment Variables then select Edit the system environment variables

3.Click the Environment Variables button.

4.Under System Variables, click New.

5.In the Variable Name field, enter either:

JAVA_HOME if you installed the JDK (Java Development Kit) or JRE_HOME if you installed the JRE (Java Runtime Environment)

6.In the Variable Value field, enter your JDK or JRE installation path.

for more see this link this