Styjun

I am trying to run react-native android app in my nexus5 emulator

adb devices
List of devices attached
emulator-5554 device

started packager react-native start

running app - react-native run-android

Installing APK 'app-debug.apk' on 'reactnative(AVD) - 6.0'
Unable to install examples/android/app/build/outputs/apk/app-debug.apk

com.android.ddmlib.InstallException: Failed to establish session
 at com.android.ddmlib.Device.installPackages(Device.java:894)
 at com.android.builder.testing.ConnectedDevice.installPackages(ConnectedDevice.java:113)
 at com.android.builder.testing.ConnectedDevice$installPackages$0.call(Unknown Source)
 at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
 at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
 at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:128)
 at com.android.build.gradle.internal.tasks.InstallVariantTask.install(InstallVariantTask.groovy:119)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:483)
 at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:75)
 at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.doExecute(AnnotationProcessingTaskFactory.java:226)

For Mi devices

for those who suffer from this, try what lironess mentions in a Github Comment

1. 
   enable developer mode - In your phone, go to Settings, About phone and click on MIUI version 7 times. You’ll see a pop up which
   says you are a developer now.


2. Go back to Settings, Additional settings, Developer options and enable USB Debugging.


3. 
   Connect your phone to your PC/Mac and on the phone authorize your computer


4. go back to Developer options, scroll down to find Turn on MIUI optimization and disable it. Your phone will be rebooted


5. Try it now :)

Try : react-native run-android --deviceId YOUR_ID.

adb is known to be flaky. Try:

• Restarting adb with $ adb kill-server
  


• Restarting the emulator


• Using Genymotion instead of stock Google emulator.

For your AVD emulator settings, try to make sure the "Use Host GPU" setting is checked, and relaunch the emulator and try again.

In my case, I have to run this command in
/sdklocation/platform-tools/

 adb kill-server

then run again and watch for install request on the phone.

hope this help some one

For those like me having this issue in the emulator, one more tip: try to free up the available storage space in the emulator. That worked for me.

So many test apps and previous developed apps installed XD