Content move up when focus input even not cover by the keyboard

my platform is android 25,a simple login page with ion-list in ion-content

global packages:

@ionic/cli-plugin-proxy : 1.3.1
@ionic/cli-utils        : 1.4.0
Cordova CLI             : 7.0.1
Ionic CLI               : 3.4.0

local packages:

@ionic/app-scripts              : 1.3.7
@ionic/cli-plugin-cordova       : 1.4.0
@ionic/cli-plugin-ionic-angular : 1.3.1
Cordova Platforms               : android 6.2.3
Ionic Framework                 : ionic-angular 3.4.2

System:

Node       : v8.0.0
OS         : Linux 4.9
Xcode      : not installed
ios-deploy : not installed
ios-sim    : not installed
npm        : 5.0.0