title: Creating APK issue React Native with Expo
body: <p>Hi I started learning react native with expo.</p>
  
  <p>Writing code and using it fastly with my phone, it works well.
  One thing is not well for me is creating apk. I searched and found "expo build:android" to create apk.It creates but takes long.Also giving error when try to install the apk like</p>
  
  <p>"You may not have proper app for viewing this content apk" and the apk size is "45mb".
  How can I create apk  with less size and time.</p>
  
  <p>Thank you</p>
  
  <p>The app.json</p>
  
  <pre><code>{
    "expo": {
      "name": "Some App",
      "slug": "some-app",
      "platforms": [
        "ios",
        "android",
        "web"
      ],
      "version": "1.0.0",
      "orientation": "portrait",
      "icon": "./assets/icon.png",
      "splash": {
        "image": "./assets/splash.png",
        "resizeMode": "contain",
        "backgroundColor": "#ffffff"
      },
      "updates": {
        "fallbackToCacheTimeout": 0
      },
      "assetBundlePatterns": [
        "**/*"
      ],
      "ios": {
        "supportsTablet": true
      },
      "android": {
        "package": "com.myapprandomname.myapprandomname"
      },
      "description": ""
    }
  }
  
  </code></pre>
  
  <p>package.json</p>
  
  <pre><code>{
    "main": "node_modules/expo/AppEntry.js",
    "scripts": {
      "start": "expo start",
      "android": "expo start --android",
      "ios": "expo start --ios",
      "web": "expo start --web",
      "eject": "expo eject"
    },
    "dependencies": {
      "expo": "~37.0.3",
      "react": "~16.9.0",
      "react-dom": "~16.9.0",
      "react-native": "https://github.com/expo/react-native/archive/sdk-37.0.1.tar.gz",
      "react-native-web": "~0.11.7"
    },
    "devDependencies": {
      "babel-preset-expo": "~8.1.0",
      "@babel/core": "^7.8.6"
    },
    "private": true
  }
  
  </code></pre>
  
  <p>I can't create apk</p>