Questions tagged [android]

For questions regarding installation, configuration, running and debugging Ethereum software specifically on the Android operating system.

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7 views

How to get events on android with infura?

I am developing an app on Android, but Web3j does not support events on infura ( Should I use Infura with Web3j for Event filter? ) . What are the options, I did not find any alternative library?
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0answers
41 views

Android Studio And Ethereum?

how i can connect android studio application with Ganache? i'm trying to build an application on android (that is my Front end) with a Smart contract (Back end) on my private Blockchain (Ganache). it'...
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56 views

getWeb3ClientVersion() returns null

I'm trying to create an android Dapp by using the web3j library. I'm using connection to a local private Ethereum blockchain. When I'm trying to display the Client version it returns null. This is the ...
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2answers
42 views

Is there an ethereum android wallet where I don't have to manually add in tokens I have and just auto detects it?

Using coinomi or even metamask on chrome is quite annoying as I need to manually add in tokens I have in my account and it doesn't auto show up. Is there an android or desktop ethereum wallet that ...
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0answers
35 views

Using web3j with infura returns null

I've used web3.js to handle my contracts, and it worked very well. But web3j is pretty hard for me since the beginning. I'm using android studio, infura, web3j. Since I don't know very much about ...
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0answers
26 views

Trouble with personalUnlockAccount,web3j

I am creating android dapp for votings I am trying to check if user's credentials are right,so i use object of PersonalUnlockAccount class and function accountUnlocked().So the problem is that when i ...
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0answers
12 views

Read contract value from Android

I have deployed successfully a smartcontract onto Rinkeby at the address : 0x69cfa9009Bf2c7a9945a4f8b381db21b26b662d7 It is a tutorial smartcontract that enables an election between 2 candidate. I ...
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1answer
102 views

Can the Android Metamask Extension be used with DApps?

I've successfully downloaded the Metamask Firefox Add-on, and imported my wallet into it. However I'm failing to see how I can use this add-on from within my DApp like I do on Chrome, using the ...
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1answer
75 views

Can't connect Android app to Ganache using retrofit

I'm have deployed contracts on ethereum blockchain. I have ganache running on server I'm tring to connect to it from android with this code: private BlockChainService() { Retrofit retrofit =...
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1answer
30 views

Is it worthwhile to store my supply chain product data on the blockchain using a smart contract? [closed]

I'm currently developing an android app that uses the Web3j framework (Java) to interact with my private Ethereum blockchain (running on Ganache). The app is a supply chain tool that will let users ...
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1answer
127 views

Mobile android app that can import a Metamask private key?

I'm having some issues sending out from metamask and getting failed transactions. I think maybe I should use another app on android if possible. What android wallet apps can import a Metamask private ...
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0answers
62 views

Build web3j to connect to blockchain [duplicate]

Can't connect to the Ethereum blockchain with web3j 4 for Android Kotlin. Worked in the previous version of web3j. fun web3(): Web3j = Web3jFactory.build(HttpService("http://192.168.38.148:7545")) ...
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0answers
52 views

How can I make an offline transaction and send it to Ethereum client network in java?

private class Myclass extends AsyncTask<Void, Void, Void> { protected Void doInBackground(Void... params) { //sldknfbhvsjhxcnzmcxcmj Web3j web3 = Web3jFactory....
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1answer
201 views

Is there an Ethereum Testnet Android Wallet?

I am looking for a testnet-specific Android wallet app to load with a few Ropsten test Ether, for a web app I'm building. But for the life of me, I cannot find such an app for Ethereum. For Bitcoin I'...
1
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1answer
111 views

web3j event listening on android project

I trying to listen events from smart contract but my code isn't working. what's the problem? Event event = droneChain.UPDATEMISSIONSTATE_EVENT; String encodedEventSignature = EventEncoder.encode(...
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1answer
95 views

How to recover an address from the signed message?

I use Trust SDK for signing messages and transactions. I recover a transaction (Trust.signTransaction()) like this: val tx = Geth.newTransactionFromRLP(Numeric.hexStringToByteArray(response.result)) ...
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0answers
83 views

Tutorials for creating ethereum wallet in android?

I saw a similarly named question over here but I sort of felt like it was closed by linking an irrelevant question which just lists existing ethereum wallets. As I understand, I should have the ...
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0answers
40 views

Generate same address

I used Geth.aar library for ethereum and it's running completely on same device. But when I changed device and restore wallet from seed at that time new address is generated instead of previous ...
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1answer
97 views

Serialization in Geth Android

KeyStore keyStore = new KeyStore(seedFile.toString(), Geth.LightScryptN, Geth.LightScryptP); byte[] jsonAccount = keyStore.exportKey(keyStore.getAccounts().get(0), seed, seed); Account importAccount = ...
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1answer
100 views

How to sign the transaction using Geth in android

I'm using Geth.aar library for handling ethereum. I generated the address, gas price, gas estimation, and transaction count. now I want to sign the transaction. Please help who knows the answer.
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0answers
60 views

Web3J - Creation of Light Wallet takes too long

I am creating the wallet in my Android app, using the library Web3j: https://web3j.io/ See the code: String seed = UUID.randomUUID().toString(); ECKeyPair exKey = Keys.createEcKeyPair(); WalletFile ...
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1answer
44 views

Generate Ethereum Address

I have used Geth.aar library for generating ethereum address from 24 word seed. But every time I got new address. I need same address every time. Please help me with this.
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1answer
755 views

Ethereum mining on Android?

Is it possible to mine Ethereum on an Android device? I know it may be inefficient, but still I want to see if I can develop and app that mines Ethereum on Android. Thanks in advance.
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1answer
753 views

How do I get the raw private key from a WalletFile object?

How can I get the raw private key from a WalletFile object? Here is how I am creating the wallet. String seed = UUID.randomUUID().toString(); ECKeyPair exKey = Keys.createEcKeyPair(); BigInteger ...
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1answer
521 views

How get Ethereum address using phrase only in Android

I want to get Etherum address and private key by adding Phrase (or Password) everytime. I tried by following many gihub code.It gives different private key everytime. In Web3j, I found it is based on ...
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1answer
267 views

Do you know any good code sample of Web3j with Android? [closed]

Do you have any good code sample of Web3j with Android? There is an example in the official docs, but I don't think it is not well self explanatory. I'd like to see an example of wallet generating or ...
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0answers
793 views

web3j Android, “E/JavaBinder: !!! FAILED BINDER TRANSACTION !!!” When try to get balance

My app tries to get the balance of an ethereum address, but when testing, it crashes. I get the error "E/JavaBinder: !!! FAILED BINDER TRANSACTION !!!" in logcat. Using web3 and android studio. Web3j ...
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2answers
783 views

Create ethereum address from seed

I want to create ethereum address from seed. Please help me to create ethereum address from seed.
2
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0answers
320 views

JsonParseException while generating java wrapper object with web3j

so a few weeks ago I created a java wrapper object with web3j for a smart contract and was able to work with it with no problems. following exactly what I did a few weeks ago I keep getting a ...
1
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1answer
333 views

How to call a deployed smart contract methods from android

I deployed a smart contract into my private network using truffle framework. After deployed the contract I implemented a client interface using android from android I want to call the methods of ...
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4answers
702 views

web3j-android error: static interface method calls are not supported at language level 1.7

I get this error static interface method calls are not supported at language level 1.7 when having Web3j web3j = Web3j.build(new HttpService(url)); documentation here says for Android you should ...
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0answers
22 views

Invoking functions of smart contract on Android phone?

Regarding to my contract code bellow, do you think that it's possible to do following scenario using a web browser on Android mobile ? Uploading GUI web application of RFID/NFC smart contract (i.e. ...
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1answer
342 views

How to use geth.aar on Android mobile?

I downloaded go-ethereum .aar file from here : https://geth.ethereum.org/downloads/ For my Android phone for invoking functions of my smart contract. But I don't know how to use this file?
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5answers
1k views

How to invoke functions of Smart Contract from Android phone?

I deployed a smart contract with solidity along with a GUI by Javascript and HTML. This project works well on my computer. Now I want to invoke functions of Smart Contract from Android phone. Is ...
0
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1answer
279 views

Serious problem! web3j-android EckeyPair returning Private Key length of 63 characters, not 64

So this is a pretty huge problem I've run into once before: I'm using web3j-android and I'm going through the process of generating random private keys and public keys using the ECKeyPair class Now ...
2
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0answers
1k views

How to integrate smart contracts with android app using web3j

I want to integrate smart contracts with the android app. I wrote a simple smart contract and I want to call that smart contract from android app. For example, in UI part of Android, I put one ...
0
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1answer
828 views

create offline ethereum wallet in android

How to create an Ethereum wallet (Keystore JSON file) in android using org.web3j:core:3.3.1-android (web3j library). Please guide me to create one.
0
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1answer
851 views

Generating a BIP-39 compatible Ethereum wallet results in IndexOutOfBoundsException?

Trying to configure android app to use a master seed phrase instead of individual private key generation. Using the new(ish) generatebip39wallet results in an indexoutofboundsexception. Offending ...
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2answers
550 views

A bit confused. How do I send ether using Web3j to an address (Android)

EDIT: I am using android platform I think I'm a bit confused conceptually. I would appreciate it if someone could answer these few questions for me as I'm trying to make an app so that I can be ...
1
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1answer
374 views

Is there an API or library available to integrate an ERC20 compatible wallet into my android app?

If the android app being developed is going to display balances and allow sending and receiving of ERC20 tokens, is there an API or library that people would recommend for this functionality?
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1answer
193 views

How to construct the network and account at client side

I am doing a project which is related to the Ethereum. But I faced the problem, so I want to ask you something. I’ll explain my project briefly. After a team meeting or purchase of materials, the ...
2
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2answers
310 views

Android Geth failed to connect to main net

Following the Android sample code from Mobile Client, along with latest geth.aar fetched from Go Ethereum Downloads (stable release 1.7.3 and development release 1.8.0). I am not able to connect to ...
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1answer
477 views

Error when calling a function of a smart contract with web3j

I am trying to use a function which returns a value of the smart contract (pakoin). contract Pacoin { /* This creates an array with all balances */ mapping (address => uint256) public ...
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2answers
426 views

How to use balanceOf function with Web3j for an android app

I am trying to use the balanceOf function after the generation of our smart contract (pakoin) function wrappers in Java with Web3j. Despite trying different ways, I get plenty of errors and I don't ...
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2answers
1k views

Android webj3 “insufficient funds for gas * price + value” exception

I'm trying to send ether in my Android app between 2 addresses which were opened using Metamask.io There is a balance of 2 ethers in "from" account. Here the code Web3j web3 = Web3jFactory....
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2answers
1k views

create a mobile wallet for my ERC20

Does anyone know if is there any open source code mobile wallet (Android or IOS) that i can use to store and transfer my custom ERC20 token. I would like to be able to modify it in order to allow it ...
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0answers
557 views

How to create custom ERC20 wallet into my app , to send and receive my tokens?

We have an app for rewards and would like to have a functionality for users to exchange or transfer there tokens to each other. Is there a way i can add that into my app?
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1answer
133 views

Speed up android geth sync

Hi I'm using rinkeby as test node for my mobile app. When I connect to node it need much time for sync mobile client with current head (especially on new accounts). Is there possibility not to ...
0
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1answer
934 views

Unable to retrieve value from Web3j sendFunds Future

I have been trying to send funds from one ethereum account to another using web3j to test that it works on Android. I am using an Infura cloud instance. First, it appears I need to send it async ...
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1answer
108 views

Any common library for Wallet and smart contract in android,IOS and Web?

Before post this question I researched about Ethereum wallet and smart contract. I saw many of the libraries which support android & iOS in different protocol, but not in a same protocol. So, I am ...