Questions tagged [android]

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

39 questions with no upvoted or accepted answers
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21
votes
0answers
579 views

E/Go: fatal error: thread exhaustion

I am experimenting with the geth-android library with light-client and in-process node from @karalabe. I could successfully sync with the testnet node from @phonikg, unfortunately this one is down now....
5
votes
2answers
90 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 ...
4
votes
0answers
418 views

Is there an app to read QR code of smartcontract bytecode and trigger it?

I want to know if there is a workaround for a smartphone user to simply scan a QR code that would trigger a transaction using a custom smartcontract (not a native currency). The contract would behave ...
3
votes
0answers
96 views

Time to first block

I am experience long waiting times from start of the block-sync to the first block. Is there any way I can speed this up? 02-08 17:21:37.971 23640 23659 E GoLog : I0208 16:21:37.980483 eth/...
3
votes
0answers
304 views

tyring to sync ropsten testnet with android-inproc: Rolled back 2 headers

I am trying to sync the new testnet with the android inproc node ( tried with geth-1.5.3, geth-1.5.4-SNAPSHOT and geth-1.5.5-SNAPSHOT ) getting this log: 11-28 20:00:29.957 6637 6861 E GoLog : ...
2
votes
0answers
135 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'...
2
votes
1answer
451 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 ...
2
votes
0answers
113 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 ...
2
votes
0answers
493 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 ...
2
votes
0answers
2k 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 ...
2
votes
0answers
335 views

mobile geth not connecting to peers

I want to have a mobile geth implementation on my android device and started with this code: https://github.com/ethereum/go-ethereum/wiki/Mobile-Clients:-Libraries-and-Inproc-Ethereum-Nodes . Then i ...
1
vote
1answer
24 views

Which is the best mobile platform to develop a blockchain based mobile application

I am new to the blockchain technology. For my semester porject i have to debelop a blockchain based healthdata management system. That includes a blockchain developed using ethereum to store the data ...
1
vote
0answers
36 views

Are there any web3 libraries for react-native or for android light-client?

I want to create a chat application using the whisper protocol for android platform , But I'm trying to use the current web3 package with react-native but I'm unable to use it as web3 package has ...
1
vote
2answers
193 views

Unable to invoke smart contract function from Web3j contract wrapper

I've been learning about interacting with smart contracts through Android and the Web3j framework but have run into an issue. I'm trying to mint an ERC721 token and send it to an address but it doesn'...
1
vote
1answer
81 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?
1
vote
1answer
89 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 ...
1
vote
0answers
106 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 ...
1
vote
0answers
40 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 ...
1
vote
0answers
65 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....
1
vote
1answer
154 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(...
1
vote
0answers
43 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 ...
1
vote
0answers
81 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 ...
1
vote
0answers
25 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. ...
1
vote
0answers
458 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?
1
vote
0answers
572 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?
1
vote
0answers
188 views

go.Universe$proxyerror: invalid transaction v, r, s values

I am getting this crash: go.Universe$proxyerror: invalid transaction v, r, s values at org.ethereum.geth.EthereumClient.getBlockByNumber(Native Method) for this call: ethClient.getBlockByNumber(...
1
vote
0answers
68 views

Wrapper for Jaxx

I would like to build android or iOS application that can send and receive data with contract. I can simply use JAXX, which can let me send 'data' to the contract. But the only problem is that I have ...
0
votes
1answer
15 views

What are the required platform to make mobile app that has dapp features?

I recently went over dapp with ethereum block chain but most of the coureses and documentation follows example in webApps. I want to know what are the possible frameworks/library, technology/ ...
0
votes
0answers
15 views

How to import an account in FireFox on Android?

Questions. How to import an account in FireFox on Android? Description: According to the instructions, I downloaded the JSON file. I received an email code. I went to the "Import Account" page. I ...
0
votes
1answer
20 views

Any email signIn based blockchain wallet APIs for integrating into web dapps & native dapps (Android, iOS)?

I'm looking for an email SignUp / SignIn based blockchain wallet which provides API for integration into web dapps and native mobile dapps (Android & iOS). During payment routine in dapps, this ...
0
votes
0answers
29 views

Reading all ERC20 token balances

I am aware that the ERC20 balance is easily obtained in web3js by calling token.methods.balanceOf(ADDRESS); However, I was wondering if there are any new developments or API that can now be used ...
0
votes
0answers
12 views

How to use whisper on the geth mobile android library?

I want to create a chat application using the whisper protocol, I wanted to know if there is any way by which I can use whisper on the node running on geth mobile android library, or does the library ...
0
votes
0answers
30 views

Web3J Java Android SendAsync Error

I am trying to interact with a method in my smart contract. The method is a simple method where you send a string value to a global variable. I end up using a SendAsync which appears to initially work,...
0
votes
0answers
14 views

How to run a private geth node on Android?

I want to run a private geth node in using AndroidStudio. How should I go about it? What to do after writing the genesis.json file? I am completely new to DApp in mobile phones. Kindly help. Thank ...
0
votes
1answer
134 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.
0
votes
2answers
492 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 ...
0
votes
2answers
2k 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....
0
votes
1answer
150 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
votes
1answer
120 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 ...