title: react-native compiled apk wont run on device
body: <p>Walkthrought with react-native tutorial (<strong>react-native 0.30</strong>):
  I created app which couldn't be installed on android device here are steps:</p>
  
  <ol>
  <li>react-native init demo</li>
  <li>cd android</li>
  <li>gradlew assembleRelease</li>
  <li>Copying unsigned apk to mobile device ( htc m8 mini 2 )</li>
  </ol>
  
  <p>and got result : <code>Application demo was not installed</code></p>
  
  <p>Based on this similiar question <a href="https://stackoverflow.com/questions/37706499/apk-didnt-run-on-mobile-android-react-native">apk didn't run on mobile android react native</a>:
  Unsigned apk won't install on mobile. </p>
  
  <p>But why I am able to run unsiged application made by Ionic 2? </p>
  
  <p>Whats the problem?</p>