Use 'ps -lef' instead of 'ps' to list Pids on Android 8.x

lib/util/devutil.js

@@ -5,6 +5,8 @@ var Promise = require('bluebird')
 
 var devutil = module.exports = Object.create(null)
 
+var commands = Object.create(null)
+
 function closedError(err) {
   return err.message.indexOf('closed') !== -1
 }
@@ -39,7 +41,24 @@ devutil.listPidsByComm = function(adb, serial, comm, bin) {
     shell: true
   }
 
-  return adb.shell(serial, ['ps'])
+  return new Promise(function(resolve) {
+    if ('ps' in commands) {
+      resolve(commands)
+    } else {
+      adb.getProperties(serial)
+        .then(function (properties) {
+          version = properties['ro.build.version.release']
+          if (version.match(/^8\./) != null) {
+            commands['ps'] = 'ps -lef'
+          } else {
+            commands['ps'] = 'ps'
+          }
+          resolve(commands)
+        })
+    }
+  })
+  .then(function (commands) {
+     return  adb.shell(serial, [commands['ps']])
             .then(function (out) {
               return new Promise(function (resolve) {
                 var header = true
@@ -61,6 +80,7 @@ devutil.listPidsByComm = function(adb, serial, comm, bin) {
                   })
               })
             })
+  })
 }
 
 devutil.waitForProcsToDie = function(adb, serial, comm, bin) {