bigchaindb-android

This is a basic android app to interact with a BigchainDB server 2.0.

This driver is under development but for now you can create and transfer transactions with one input/output.

The driver do not use the java classes created by the Authenteq Team, it uses a new class called CustomTransaction.java. Shortly I'm going to delete the classes created by Authenteq that I do not use.

Android Compatibility

minSdkVersion 26

Run the App

Clone the Android App.

  git clone https://github.com/GerardoGa/bigchaindb-android/

Modify the Main.java file:

• Set your app_id and app_key if needed.

  BigchainDbConfigBuilder
        .baseUrl("https://test.bigchaindb.com")
        .addToken("app_id", "<your app id>")
        .addToken("app_key", "<your app key id>").setup();
  

• Change the seed string used to create the Keypair.

  KeyPair keyPair = generatekeypair("Seed"); 
  

Build and install the app into your Android Device.

Current options

Currenty there are two buttons in the main view:

• Create Transaction: Creates a new asset in the BigchainDB server using the keypair generated. The button executes this code where dataAsset is the JsonObject with the data of the new asset and metadataAsset is also a JsonObject with the metadata of the transaction.

  CustomTransaction transaction = new CustomTransaction();
  
  transaction
          .addAsset(dataAsset)
          .addMetadata(metadataAsset)
          .addInput((EdDSAPublicKey) keyPair.getPublic()) //origin
          .addOutput((EdDSAPublicKey) keyPair.getPublic()) //destination
          .operation("CREATE")
          .sendJSONTransaction();
  

• Transfer Transaction: Transfers the created asset to yourself. If you keep clicking this button, the asset will be transfered with the new metadata values. The button executes this code where prevTxId is the id of the previous trasaction of the asset that you want to transfer and metadataAsset is the new information of the transaction.

  CustomTransaction transaction = new CustomTransaction(prevTxId);
  
  transaction.addMetadata(metadataAsset)
          .addInput((EdDSAPublicKey) keyPair.getPublic(), 0) //origin
          .addOutput((EdDSAPublicKey) keyPair.getPublic()) //destination
          .operation("TRANSFER")
          .signTransaction((EdDSAPrivateKey) keyPair.getPrivate())
          .sendJSONTransaction();