Questions tagged [android]

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

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How to connect Ethereum smart contracts in Solidity to Android mobile app created in Java? [closed]

We don’t really know where the crop produce comes from in the current scheme, nor do we know whether the farmers are being paid the correct sum for what they’ve planted. There is no transparency and ...
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62 views

window.ethereum undefined android metamask webview

When I open my site in android in the metamask layout in the webview, I always get window.ethereum === undefined. And also window.web3 === undefined. This problem only persists on android. On pc and ...
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1answer
254 views

How do i import my ethereum wallet just using private key?

Help me out how do i resolve the issue of ethereum smartcontract for getting my wallet when i enter my private key in the text area Use WalletUtils functionality The WalletUtils class can be used to ...
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11 views

Calling schemas of various mobile wallets on iOS and Android

I realize that I can call web3 methods and browser extensions like MetaMask will leap into action, allowing me to set up any kind of transaction The question, can I do this on iOS and Android, with ...
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org.web3j.protocol.exceptions.ClientConnectionException: Invalid response received: okhttp3.internal.http.RealResponseBody

Environment Android Studio Infura – Rinkeby test network Web3J Metamask Rinkeby.etherscan.io I am trying to build an Android app to read and write smart contract by following the medium article: ...
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103 views

org.web3j.protocol.exceptions.ClientConnectionException: Invalid response received on web3j on Android

I am trying to execute transactions by calling my RegisterNewUser function in the deployed smart contract through Android and I am using Infura. However, when I run, there is an error as seen below : ...
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1answer
48 views

How to catch a solidity event from Java

I am trying to make a decentralized android application. It is an online two player Tic-Tac-Toe game. I have implemented the back-end with solidity and a part of the front-end in android studio. ...
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1answer
32 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/ ...
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1answer
40 views

How to reliably send transaction via web3j while connection is poor?

I use Transfer.sendFunds(Web3j, Credentials, BigDecimal, Convert.Unit) to transfer money. Usually I convert it to flowable. Flowable/RemoteCall completes when transaction is included in block (...
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1answer
414 views

How to import an account in Metamask browser on Android? [closed]

Questions. How to import an account in Metamask browser on Android? or How to use Metamask in Android? Description: I followed the link metamask.io I clicked Get Chrome Extension. The site ...
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1answer
8k views

How to install Metamask on Chrome in Android?

Questions. How to install Metamask on Chrome in Android? or How to use Metamask in Android? Description: I followed the link metamask.io I tried Get Chrome Extension. The site redirected me ...
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1answer
30 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 ...
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1answer
30 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 ...
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52 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 ...
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2answers
433 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'...
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1answer
119 views

Unable to load smart contract using web3j on android

What I'my trying to do is to load already deployed smart contract and interact with it. The problem is that after my credentials are being created properly, the error is being catched but the message ...
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1answer
99 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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180 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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1answer
97 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
136 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
148 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
47 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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1answer
1k 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
344 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
51 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
608 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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106 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
82 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
359 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'...
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1answer
196 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
206 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
120 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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46 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
132 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
158 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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93 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
88 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
1k 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
1k 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
893 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
398 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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3answers
4k views

Create ethereum address from seed

I want to create ethereum address from seed. Please help me to create ethereum address from seed.
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0answers
561 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 ...
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1answer
641 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
1k 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
36 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
459 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
2k 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 ...
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1answer
473 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 ...
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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 ...