Pure Kotlin Echo framework for Android mobile development. Can be used to work with accounts, transactions and contracts in Kotlin, and to easily obtain data from the blockchain via public apis.
This framework can be obtained through gradle dependency:
implementation 'org.echo.mobile:echoframework:5.1.1'
Or maven dependency:
<dependency>
<groupId>org.echo.mobile</groupId>
<artifactId>echoframework</artifactId>
<version>5.1.1</version>
<type>pom</type>
</dependency>
For setup framework use this simple code:
// Create and Setup framework main class
fun init() {
val echo = EchoFramework.create(
/** Here you can put your custom settings for our framework
Example:
Custom api options which can be used
*/
Settings.Configurator()
.setUrl(ECHO_URL)
.setApis(Api.DATABASE, Api.ACCOUNT_HISTORY, Api.NETWORK_BROADCAST)
.configure()
)
// Start framework. Connect to node and setup public apis
echo.start(object : Callback<Any> {
override fun onError(error: LocalException) { }
override fun onSuccess(result: Any) {}
})
}There are simple examples of usage framework
fun login() {
echo.isOwnedBy("name", "wif", object : Callback<FullAccount> {
override fun onSuccess(result: FullAccount) {}
override fun onError(error: LocalException) {}
})
}fun getInfo() {
val name = "some name"
echo.getAccount(name, object : Callback<FullAccount> {
override fun onSuccess(result: FullAccount) {}
override fun onError(error: LocalException) {}
})
echo.getBalance(name, "1.3.0", object : Callback<Balance> {
override fun onSuccess(result: Balance) {}
override fun onError(error: LocalException) {}
})
echo.isOwnedBy(name, "wif", object : Callback<FullAccount> {
override fun onSuccess(result: FullAccount) {}
override fun onError(error: LocalException) {}
})
}fun getHistory() {
echo.getAccountHistroy(nameOrId = "some id",
startId = "1.11.0",
stopId = "1.11.0",
limit = 100,
object : Callback<HistoryResponce> {
override fun onSuccess(result: HistoryResponse) {}
override fun onError(error: LocalException) {}
})
}fun subscribeOnAccount() {
echo.subscribeOnAccount("account name or id",
object : AccountListener {
override fun onChange(updatedAccount: FullAccount) {}
},
object : Callback<Boolean> {
override fun onSuccess(result: Boolean) {}
override fun onError(error: LocalException) {}
})
}fun changeWif() {
echo.changeKeys(
"account name or id",
"old wif",
"new wif",
object : Callback<Boolean> {
override fun onSuccess(result: Boolean) {}
override fun onError(error: LocalException) {}
},
ResultCallback(object: Callback<TransactionResult> {
override fun onSuccess(result: TransactionResult) {}
override fun onError(error: LocalException) {}
})
)
}fun feeForTransfer() {
framework.getFeeForTransferOperation(
"from name or id",
"from account wif",
"to name or id",
amount = "10000",
asset = "1.3.0",
feeAsset = "1.3.0", //optional
object : Callback<String> {
override fun onSuccess(result: String) {}
override fun onError(error: LocalException) {}
}
)
}fun send() {
echo.sendTransferOperation(fromNameOrId = "some name",
password = "some wif",
toNameOrId = "some name",
amount = "300",
asset = "1.3.0",
feeAsset = "1.3.0",
object : Callback<Boolean> {
override fun onSuccess(result: Boolean) {}
override fun onError(error: LocalException) {}
},
ResultCallback(object: Callback<TransactionResult> {
override fun onSuccess(result: TransactionResult) {}
override fun onError(error: LocalException) {}
})
)
}fun createAsset() {
val asset = Asset("").apply {
symbol = "ASSET SYMBOL"
precision = 4
issuer = Account("issuer id")
setBtsOptions(
BitassetOptions(
feedLifetimeSec = 86400,
minimumFeeds = 7
)
)
}
val price = Price().apply {
this.quote = AssetAmount(UnsignedLong.valueOf(1), Asset("1.3.1"))
this.base = AssetAmount(UnsignedLong.valueOf(1), Asset("1.3.0"))
}
val options = AssetOptions(
UnsignedLong.valueOf(100000),
AssetOptions.CHARGE_MARKET_FEE,
AssetOptions.CHARGE_MARKET_FEE,
price,
"description"
)
asset.assetOptions = options
echo.createAsset(
"issuer name or id",
"wif",
asset,
broadcastCallback = object : Callback<Boolean> {
override fun onSuccess(result: Boolean) {}
override fun onError(error: LocalException) {}
},
ResultCallback(object: Callback<TransactionResult> {
override fun onSuccess(result: TransactionResult) {}
override fun onError(error: LocalException) {}
})
)
}fun issueAsset() {
framework.issueAsset(
"issuer account name or id",
"wif",
"1.3.79",
"1",
"target account name or id",
object : Callback<Boolean> {
override fun onSuccess(result: Boolean) {}
override fun onError(error: LocalException) {}
},
ResultCallback(object: Callback<TransactionResult> {
override fun onSuccess(result: TransactionResult) {}
override fun onError(error: LocalException) {}
})
)
}fun createContract() {
val byteCode = "some bytecode"
framework.createContract(
"registrarNameOrId",
"wif",
assetId = "1.3.0",
feeAsset = "1.3.0", // optional
byteCode,
params = listOf(), // optional
broadcastCallback = object : Callback<Boolean> {
override fun onSuccess(result: Boolean) {}
override fun onError(error: LocalException) {}
},
resultCallback = object : Callback<String> {
override fun onSuccess(result: String) {}
override fun onError(error: LocalException) {}
} // optional
)
}fun callContract() {
echo.callContract(
"account name or id",
"wif",
assetId = "1.3.0",
feeAsset = "1.3.0", //optional
contractId = "contractId",
methodName = "incrementCounter",
methodParams = listOf(),
value = "1", //optional
broadcastCallback = object : Callback<Boolean> {
override fun onSuccess(result: Boolean) {}
override fun onError(error: LocalException) {}
},
resultCallback = object : Callback<String> {
override fun onSuccess(result: String) {}
override fun onError(error: LocalException) {}
} //optional
)
}fun queryContract() {
echo.queryContract(
"account name or id",
assetId = "1.3.0",
contractId = "contractId",
"getCount",
amount = "0",
methodParams = listOf(),
object : Callback<String> {
override fun onSuccess(result: String) {}
override fun onError(error: LocalException) {}
}
)
}