Fix Android configuration to allow connecting to http://ipfs.singularitynet.io on Android 9+ #50
Description
Since Android 9 cleartext connections are forbidden by default, see: https://developer.android.com/training/articles/security-config#CleartextTrafficPermitted
This causes the following NullPointerException error on demo app start:
java.lang.NullPointerException: Attempt to invoke virtual method 'int java.io.InputStream.read(byte[])' on a null object reference
at io.ipfs.api.IPFS.readFully(IPFS.java:763)
at io.ipfs.api.IPFS.get(IPFS.java:682)
at io.ipfs.api.IPFS.retrieve(IPFS.java:662)
at io.ipfs.api.IPFS.retrieveAndParse(IPFS.java:624)
at io.ipfs.api.IPFS.version(IPFS.java:572)
at io.ipfs.api.IPFS.<init>(IPFS.java:69)
at io.ipfs.api.IPFS.<init>(IPFS.java:45)
at io.singularitynet.sdk.client.ConfigurationDependencyFactory.<init>(ConfigurationDependencyFactory.java:64)
at io.singularitynet.sdk.client.Sdk.<init>(Sdk.java:63)
at com.example.singsplit.SnetSdk.<init>(SnetSdk.java:22)
at com.example.singsplit.MainActivity.openSingularityNETServiceChannel(MainActivity.java:161)
at com.example.singsplit.MainActivity.access$300(MainActivity.java:71)
at com.example.singsplit.MainActivity$OpenServiceChannelTask.doInBackground(MainActivity.java:200)
at android.os.AsyncTask$3.call(AsyncTask.java:378)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:289)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:919)
see similar IPFS issue: ipfs-shipyard/java-ipfs-http-client#125
To fix it:
- add correct network configuration to the Android demo app source code, test it on Android 10
- add this step to the Gradle plugin README.md