message: Moved url out of state onto instance
diff: @@ -3,9 +3,10 @@ import * as React from 'react';
  import { BackAndroid } from 'react-native';
  class NavigationBackAndroid extends React.Component<any, any> {
  + private url: string;
  private onBack = () => {
  var stateNavigator = this.getStateNavigator();
  - if (this.state.url === stateNavigator.stateContext.url) {
  + if (this.url === stateNavigator.stateContext.url) {
  var listener = this.props.navigating;
  var navigate = true;
  if (listener)
  @@ -19,7 +20,7 @@ class NavigationBackAndroid extends React.Component<any, any> {
  }
  constructor(props, context) {
  super(props, context);
  - this.state = {url: this.getStateNavigator().stateContext.url};
  + this.url = this.getStateNavigator().stateContext.url;
  }
  static contextTypes = {
  stateNavigator: React.PropTypes.object
  