[ { "path": ".github/workflows/pull-request-notify.yml", "content": "name: Notify PR events\n\non:\n pull_request:\n\njobs:\n build:\n runs-on: ubuntu-latest\n\n steps:\n - uses: actions/checkout@v2\n - name: Notify to Telegrem\n uses: appleboy/telegram-action@master\n with:\n to: ${{secrets.TELEGRAM_TO}}\n token: ${{secrets.TELEGRAM_TOKEN}}\n disable_web_page_preview: true\n message: |\n ${{ github.event.pull_request.html_url }}\n\n Title: ${{github.event.pull_request.title}}\n Author: ${{github.actor}}\n" }, { "path": ".gitignore", "content": "*.iml\n.gradle\n.idea\n.DS_Store\n/build\n/captures\n/local.properties\n.externalNativeBuild\n" }, { "path": ".gitmodules", "content": "[submodule \"dashkit/cpp/dashj-bls/bls-signatures\"]\n\tpath = dashkit/cpp/dashj-bls/bls-signatures\n\turl = https://github.com/Chia-Network/bls-signatures\n" }, { "path": "CONTRIBUTING.md", "content": "## Implementing support for a new coin for external developers\n\nSupport for coin is implemented as a separate module that depends on the module `bitcoincore`. This repository contains modules for supporting coins like `Bitcoin`, `BitcoinCash` and `Dash`. Support for a new coin should be implemented in the owners repository.\n\n### Structure of module\n\nThe module depends on the `bitcoincore`. This dependency can be added via JitPack repository. \n\nIn the main `build.gradle` add the JitPack repository:\n\n```\nrepositories {\n maven { url 'https://jitpack.io' }\n}\n```\n\nAdd the following dependency to module `build.gradle` file:\n\n```\ndependencies {\n implementation 'com.github.horizontalsystems.bitcoin-kit-android:bitcoincore:${version}'\n}\n```\n\nIt implements `AbstractKit` and `Network` interfaces (abstract classes). \n\nCustomizing can be done in 2 places:\n\n1. Via `BitcoinCoreBuilder` when building `BitcoinCore`\n2. Via `BitcoinCore`\n\nThere are multiple places that can be customized. See the modules [`bitcoinkit`](bitcoinkit), [`bitcoincashkit`](bitcoincashkit) and [`dashkit`](dashkit) for reference. If you need a new extension point please [add an issue](https://github.com/horizontalsystems/bitcoin-kit-android/issues/new).\n\nWhen the module is released let us know about it. We will review it and decide whether to add it to Unstoppable wallet app.\n" }, { "path": "LICENSE", "content": "MIT License\n\nCopyright (c) 2018 Horizontal Systems\n\nPermission is hereby granted, free of charge, to any person obtaining a copy\nof this software and associated documentation files (the \"Software\"), to deal\nin the Software without restriction, including without limitation the rights\nto use, copy, modify, merge, publish, distribute, sublicense, and/or sell\ncopies of the Software, and to permit persons to whom the Software is\nfurnished to do so, subject to the following conditions:\n\nThe above copyright notice and this permission notice shall be included in all\ncopies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\nIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\nFITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\nAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\nLIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\nOUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\nSOFTWARE.\n" }, { "path": "README.md", "content": "# BitcoinKit\n\n`bitcoin-kit-android` is a Bitcoin wallet toolkit implemented in Kotlin. It consists of following libraries:\n\n- `bitcoincore` is a core library that implements a full Simplified Payment Verification (`SPV`) client in `Kotlin`. It implements Bitcoin `P2P Protocol` and can be extended to be a client of other Bitcoin forks like BitcoinCash, Litecoin, etc. \n- `bitcoinkit` extends **bitcoincore**, makes it usable with `Bitcoin` network.\n- `bitcoincashkit` extends **bitcoincore**, makes it usable with `BitcoinCash(ABC)` network.\n- `litecoinkit` extends **bitcoincore**, makes it usable with `Litecoin` network.\n- `dashkit` extends **bitcoincore**, makes it usable with `Dash` network.\n- `hodler` is a plugin for `bitcoincore`, that makes it possible to lock certain amount of coins until some time in the future. \n\nBeing an SPV client, **bitcoincore** downloads and validates all the block headers, inclusion of transactions in the blocks, integrity and immutability of transactions as described in the Bitcoin whitepaper or delegates validation to the extensions that implement the forks of Bitcoin.\n\n## Core Features\n\n- [x] Bitcoin P2P Protocol implementation in Kotlin.\n- [x] Full SPV implementation for fast mobile performance with account security and privacy in mind\n- [x] `P2PK`, `P2PKH`, `P2SH-P2WPKH`, `P2WPKH` outputs support.\n- [x] Restoring with mnemonic seed. (Generated from private seed phrase)\n- [x] Restoring with [BIP32](https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki) extended public key. (This becomes a `Watch account` unable to spend funds)\n- [x] Quick initial restore over node API. (optional)\n- [x] Handling transaction (Replacement)/(Double spend)/(Failure by expiration)\n- [x] Optimized UTXO selection when spending coins.\n- [x] [BIP69](https://github.com/bitcoin/bips/blob/master/bip-0069.mediawiki) or simple shuffle output ordering. (configurable)\n- [x] [BIP21](https://github.com/bitcoin/bips/blob/master/bip-0021.mediawiki) URI schemes with payment address, amount, label and other parameters\n\n\n# bitcoinkit\n\n## Usage\n\n### Initialization\n\nFirst, you need an instance of *BitcoinKit* class. You can initialize it with Mnemonic seed or BIP32 extended key (private or public). To generate seed from mnemonic seed phrase you can use [HdWalletKit](https://github.com/horizontalsystems/hd-wallet-kit-android) to convert a word list to a seed.\n\n```kotlin\nval words = listOf(\"mnemonic\", \"phrase\", \"words\")\nval passphrase: String = \"\"\n \nval seed = Mnemonic().toSeed(words, passphrase)\n```\n\nThen you can pass a seed to initialize an instance of *BitcoinKit*\n\n```kotlin\nval context = Application()\n\nval bitcoinKit = BitcoinKit(\n context = context,\n seed = seed,\n walletId = \"unique_wallet_id\",\n syncMode = BitcoinCore.SyncMode.Api(),\n networkType = NetworkType.MainNet,\n confirmationsThreshold = 6,\n purpose = HDWallet.Purpose.BIP84\n)\n```\n\n#### `purpose`\n\n*bitcoinkit* supports `BIP44`, `BIP49` and `BIP84` wallets. They have different derivation paths, so you need to specify this on kit initialization.\n\n\n#### `syncMode`\n\n*bitcoinkit* pulls all historical transactions of given account from bitcoin peers according to SPV protocol. This process may take several hours as it needs to download every block header with some transactions to find transactions concerning the accounts addresses. In order to speed up the initial blockchain scan, *bitcoincore* has some optimization options:\n\n- It doesn't download blocks added before the [BIP44](https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki) was implemented by wallets, because there were no transactions concerning addresses generated by BIP44 wallets.\n\n- If you set **API()** or **NewWallet()** to *syncMode* parameter, it first requests from an **API**(currently [Blockchain.com](https://blockchain.info)) the hashes of the blocks where there are transactions we need. Then, it downloads those blocks from the bitcoin peers. This reduces the initial synchronization time to several minutes. This also carries some risks that makes it possible for a middle-man attacker to learn about the addresses requested from your IP address. But your funds are totally safe.\n\nIf you set **Full()** to *syncMode*, then only decentralized peers are used. Once the initial blockchain scan is completed, the remaining synchronization works with decentralized peers only for all *syncMode*s.\n\n#### Additional parameters:\n- `networkType`: Mainnet or Testnet\n- `confirmationsThreshold`: Minimum number of confirmations required for an unspent output to be available for use (*default: 6*)\n\n#### Initializing with HD extended key\n\nYou can initialize `BitcoinKit` using BIP32 Extended Private/Public Key as follows:\n\n```kotlin\nval extendedKey = HDExtendedKey(\"xprvA1BgyAq84AiAsrMm6DKqwCXDwxLBXq76dpUfuNXNziGMzDxYLjE9AkuYBAQTpt6aJu4nFYamh6BbrRkys5fJcxGd7qixNrpVpPBxui9oYyF\")\n\nval bitcoinKit = BitcoinKit(\n context = context,\n extendedKey = extendedKey,\n walletId = \"unique_wallet_id\",\n syncMode = BitcoinCore.SyncMode.Api(),\n networkType = NetworkType.MainNet,\n confirmationsThreshold = 6\n)\n```\n\nIf you restore with a public extended key, then you only will be able to watch the wallet. You won't be able to send any transactions. This is how the **watch account** feature is implemented.\n\n### Starting and Stopping\n\n*BitcoinKit* requires to be started with `start` command. It will be in synced state as long as it is possible. You can call `stop` to stop it\n\n```kotlin\nbitcoinKit.start()\nbitcoinKit.stop()\n```\n\n### Getting wallet data\n\n#### Balance\n\nBalance is provided in `Satoshis`:\n\n```kotlin\nval balance = bitcoinKit.balance\n\nprintln(balance.spendable)\nprintln(balance.unspendable)\n```\n\nUnspendable balance is non-zero if you have UTXO that is currently not spendable due to some custom unlock script. These custom scripts can be implemented as a plugin, like **Hodler**\n\n#### Last Block Info\n\n```kotlin\nval blockInfo = bitcoinKit.lastBlockInfo ?: return\n\nprintln(blockInfo.headerHash)\nprintln(blockInfo.height)\nprintln(blockInfo.timestamp)\n```\n\n#### Receive Address\n\nGet an address which you can receive coins to. Receive address is changed each time after you actually get some coins in that address\n\n```kotlin\nbitcoinKit.receiveAddress() // \"mgv1KTzGZby57K5EngZVaPdPtphPmEWjiS\"\n```\n\n#### Transactions\n\nYou can get your transactions using `transactions(fromUid: String? = null, type: TransactionFilterType? = null, limit: Int? = null)` method of the *BitcoinKit* instance. It returns *Single>*. You'll need to subscribe and get transactions asynchronously. See [RX Single Observers](http://reactivex.io/RxJava/3.x/javadoc/io/reactivex/rxjava3/core/Single.html) for more info.\n\n\n```kotlin\nval disposables = CompositeDisposable()\n\nbitcoinKit.transactions().subscribe { transactionInfos ->\n for (transactionInfo in transactionInfos) {\n println(\"Uid: ${transactionInfo.uid}\")\n println(\"Hash: ${transactionInfo.transactionHash}\")\n }\n}.let {\n disposables.add(it)\n}\n```\n\n- `fromUid` and `limit` parameters can be used for pagination. \n- `type` parameter enables to filter transactions by coins flow. You can pass *incoming* OR *outgoing* to get filtered transactions\n\n\n#### TransactionInfo\n\nA sample dump:\n\n```kotlin\n// transactionInfo = {TransactionInfo}\n// amount = 13114\n// blockHeight = 740024\n// conflictingTxHash = null\n// fee = null\n// inputs = {ArrayList} size = 1\n// 0 = {TransactionInputInfo}\n// address = \"16s6q8dAgLbDT3szEc4nvTh81deRCBtEa1\"\n// mine = false\n// value = null\n// outputs = {ArrayList} size = 2\n// 0 = {TransactionOutputInfo}\n// address = \"bc1qsg9ul383f8pespcvc8u3katl6gnsr7sjyfe3pc\"\n// changeOutput = false\n// mine = true\n// pluginData = null\n// pluginDataString = null\n// pluginId = null\n// value = 13114\n// 1 = {TransactionOutputInfo}\n// address = \"16VCm8mYhHE3EiELi8GiYEqAjnPu1TSgAV\"\n// changeOutput = false\n// mine = false\n// pluginData = null\n// pluginDataString = null\n// pluginId = null\n// value = 1422\n// status = {TransactionStatus} RELAYED\n// timestamp = 1654766137\n// transactionHash = \"cadf99db1e145dcfadfa2bc3eacb94831eb6c53d376f4f873aa4ac017b8c7f8f\"\n// transactionIndex = 2760\n// type = {TransactionType} Incoming\n// uid = \"75934663-3c84-4b38-9b6d-810d3433de17\"\n```\n\n`uid`\n\nA local unique ID\n\n`type` \n\n- *Incoming*\n- *Outgoing*\n- *SentToSelf*\n\n`status`\n\n- *NEW* -> transaction is in mempool\n- *RELAYED* -> transaction is in block\n- *INVALID* -> transaction is not included in block due to an error OR replaced by another one (RBF).\n\n\n### Sending BTC\n\n\n```kotlin\nbitcoinKit.send(address = \"36k1UofZ2iP2NYax9znDCsksajfKeKLLMJ\", value = 100000000, feeRate = 10, sortType = TransactionDataSortType.Bip69)\n```\n\nThis first validates a given address and amount, creates new transaction, then sends it over the peers network. If there's any error with given address/amount or network, it raises an exception.\n\n#### Validate address\n\n```kotlin\nbitcoinKit.validateAddress(address = \"mrjQyzbX9SiJxRC2mQhT4LvxFEmt9KEeRY\")\n```\n\n#### Evaluate fee\n\n```kotlin\nbitcoinKit.fee(address = \"36k1UofZ2iP2NYax9znDCsksajfKeKLLMJ\", value = 100000000, feeRate = 10)\n```\n\n\n### Parsing BIP21 URI\n\nYou can use `parsePaymentAddress` method to parse a BIP21 URI:\n\n```kotlin\nbitcoinKit.parsePaymentAddress(\"bitcoin:175tWpb8K1S7NmH4Zx6rewF9WQrcZv245W?amount=50&label=Luke-Jr&message=Donation%20for%20project%20xyz\")\n\n\n// ▿ BitcoinPaymentData\n// - address : \"175tWpb8K1S7NmH4Zx6rewF9WQrcZv245W\"\n// - version : null\n// - amount : 50.0\n// - label : \"Luke-Jr\"\n// - message : \"Donation for project xyz\"\n// - parameters : null\n```\n\n### Subscribing to BitcoinKit data\n\nBalance, transactions, last blocks synced and kit state are available in real-time. `BitcoinKit.Listener` interface must be implemented and set to *BitcoinKit* instance to receive that.\n\n```kotlin\nclass Manager(val bitcoinKit: BitcoinKit) : BitcoinKit.Listener {\n \n init {\n bitcoinKit.listener = this\n }\n\n override fun onBalanceUpdate(balance: BalanceInfo) {\n }\n\n override fun onLastBlockInfoUpdate(blockInfo: BlockInfo) {\n }\n\n override fun onKitStateUpdate(state: BitcoinCore.KitState) {\n }\n\n override fun onTransactionsUpdate(inserted: List, updated: List) {\n }\n\n override fun onTransactionsDelete(hashes: List) {\n }\n\n}\n```\n\n# bitcoincashkit\n\n\n## Features\n\n- [x] `Base58` and `Bech32`\n- [x] Validation of BCH hard forks\n- [x] `ASERT`, `DAA`, `EDA` validations\n\n\n## Usage \n\nBecause BitcoinCash is a fork of Bitcoin, the usage of this library does not differ much from `bitcoinkit`. So we only describe some differences between them.\n\n### Initialization\n\nAll BitcoinCash wallets use default [BIP44](https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki) derivation path where *coinType* is `145` according to [SLIP44](https://github.com/satoshilabs/slips/blob/master/slip-0044.md). But since it's a fork of Bitcoin, `0` coinType also can be restored.\n\n```kotlin\nval context = Application()\nval seed = Mnemonic().toSeed(listOf(\"mnemonic\", \"phrase\", \"words\"), \"\")\n\nval bitcoinCashKit = BitcoinCashKit(\n context = context,\n seed = seed,\n walletId = \"unique_wallet_id\",\n syncMode = BitcoinCore.SyncMode.Api(),\n networkType = NetworkType.MainNet(MainNetBitcoinCash.CoinType.Type145),\n confirmationsThreshold = 6\n)\n```\n\n# litecoinkit\n\nUsage identical to `bitcoinkit`\n\n# dashkit\n\n## Features\n\n- [x] Instant send\n- [x] LLMQ lock, Masternodes validation\n\n## Usage\n\n### Initialization\n\n```kotlin\nval context = Application()\nval seed = Mnemonic().toSeed(listOf(\"mnemonic\", \"phrase\", \"words\"), \"\")\n\nval dashKit = DashKit(\n context = context,\n seed = seed,\n walletId = \"unique_wallet_id\",\n syncMode = BitcoinCore.SyncMode.Api(),\n networkType = NetworkType.MainNet,\n confirmationsThreshold = 6\n)\n```\n\n### DashTransactionInfo\n\nDash has some transactions marked `instant`. So, instead of `TransactionInfo` object *DashKit* works with `DashTransactionInfo` that has that field and a respective `DashKit.Listener` listener class.\n\n\n# hodler\n\n`hodler` is a plugin to `bitcoincore`, that makes it possible to lock bitcoins until some time in the future. It relies on [CHECKSEQUENCEVERIFY](https://github.com/bitcoin/bips/blob/master/bip-0112.mediawiki) and [Relative time-locks](https://github.com/bitcoin/bips/blob/master/bip-0068.mediawiki). It may be used with other forks of Bitcoin that support them. `UnstooppableWallet` opts in this plugin and enables it for Bitcoin as an experimental feature.\n\n## How it works\n\nTo lock funds we create P2SH output where redeem script has `OP_CSV` OpCode that ensures that the input has a proper Sequence Number(`nSequence`) field and that it enables a relative time-lock. \n\nIn [this](https://blockstream.info/tx/1cd11e80d04c82d098f19badb153ea12ec84cda408daaadc566cc129f967a435?input:1&expand) sample transaction the second input unlocks such an output. It has a signature, public key and the following redeem script in its scriptSig:\n\n`OP_PUSHBYTES_3 070040 OP_CSV OP_DROP OP_DUP OP_HASH160 OP_PUSHBYTES_20 853316620ed93e4ade18f8218f9aa15dc36c768e OP_EQUALVERIFY OP_CHECKSIG`\n\n- `OP_PUSHBYTES_3 070040 OP_CSV OP_DROP` part ensures that needed amount of time is passed. Specifically `07` part of `070040` bytes says that it's locked for 1 hour. See [here](https://github.com/horizontalsystems/bitcoin-kit-android/blob/master/hodler/src/main/kotlin/io/horizontalsystems/hodler/LockTimeInterval.kt) and [here](https://github.com/bitcoin/bips/blob/master/bip-0068.mediawiki) for how it's evaluated.\n- `OP_DUP OP_HASH160 OP_PUSHBYTES_20 853316620ed93e4ade18f8218f9aa15dc36c768e OP_EQUALVERIFY OP_CHECKSIG` part is the same locking script as of `P2PKH` output, that ensures the spender is the owner of the private key matching the public key hashed to `853316620ed93e4ade18f8218f9aa15dc36c768e`.\n\n### Detection of incoming time-locked funds\n\nWhen you have such an `P2SH` output, you only have an address and a hash of a redeem script in the output. If you are not aware of incoming time-locked funds in advance, there's no way you can detect that a particular output is yours. For this reason, we add an extra `OP_RETURN` output beside that `P2SH` output as a hint. That output tells us \n\n- ID of the plugin (1 byte): `bitcoincore` can handle multiple plugins like this one.\n- Time-lock period (2 bytes)\n- Hash of the receiver's public key (20 bytes)\n\nFor example, [this](https://blockstream.info/tx/bdc3e995100269c8813f291dd9ea5489d8a17bd163002f70b5abbe05b5dccbd3?expand) is a *hint* output for the input above. It has following data:\n\n`OP_RETURN OP_PUSHNUM_1 OP_PUSHBYTES_2 0700 OP_PUSHBYTES_20 853316620ed93e4ade18f8218f9aa15dc36c768e` \n\n\n## Limitations\n\n### Locked time periods\n\nThis plugin can lock coins for `1 hour`, `1 month`, `half a year` and `1 year`. This is a limitation arising from the need of restoring those outputs using Simplified Payment Verification (SPV) `Bloom Filters`. Since each lock time generates different `P2SH` addresses, it wouldn't be possible to restore those outputs without knowing the exact lock time period in advance. So we generate 4 different addresses for each public key and use them in the bloom filters.\n\n### BTC amount\n\nWe allow maximum 0.5 BTC to be locked. We assume that's an acceptable amount to be locked if done unintentionally.\n\n\n## Prerequisites\n* JDK >= 1.8\n* Android 6 (minSdkVersion 23) or greater\n\n## Installation\nAdd the JitPack to module build.gradle\n```\nrepositories {\n maven { url 'https://jitpack.io' }\n}\n```\nAdd the following dependency to your build.gradle file:\n```\ndependencies {\n implementation 'com.github.horizontalsystems:bitcoin-kit-android:master-SNAPSHOT'\n}\n```\n\n## Example App\n\nAll features of the library are used in example project. It can be referred as a starting point for usage of the library.\n* [Example App](https://github.com/horizontalsystems/bitcoin-kit-android/tree/master/app)\n\n## Dependencies\n* [HDWalletKit](https://github.com/horizontalsystems/hd-wallet-kit-android) - HD Wallet related features, mnemonic phrase \n\n## Contributing\n\n[Contributing](CONTRIBUTING.md)\n\n## License\n\nThe `bitcoin-kit-android` is open source and available under the terms of the [MIT License](https://github.com/horizontalsystems/bitcoin-kit-android/blob/master/LICENSE)\n" }, { "path": "app/.gitignore", "content": "/build\n" }, { "path": "app/build.gradle", "content": "plugins {\n id 'com.android.application'\n id 'org.jetbrains.kotlin.android'\n}\n\nandroid {\n namespace 'io.horizontalsystems.bitcoinkit.demo'\n compileSdk 34\n\n defaultConfig {\n applicationId \"io.horizontalsystems.bitcoinkit.demo\"\n minSdkVersion 23\n targetSdkVersion 34\n versionCode 1\n versionName \"0.3.0\"\n testInstrumentationRunner \"androidx.test.runner.AndroidJUnitRunner\"\n }\n buildTypes {\n release {\n minifyEnabled false\n proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'\n }\n }\n compileOptions {\n sourceCompatibility JavaVersion.VERSION_17\n targetCompatibility JavaVersion.VERSION_17\n }\n kotlinOptions { jvmTarget = '17' }\n packagingOptions {\n resources {\n pickFirsts += ['META-INF/atomicfu.kotlin_module']\n }\n }\n}\n\ndependencies {\n implementation fileTree(dir: 'libs', include: ['*.jar'])\n\n implementation \"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version\"\n implementation 'androidx.appcompat:appcompat:1.6.1'\n implementation 'androidx.constraintlayout:constraintlayout:2.1.4'\n implementation 'com.google.android.material:material:1.10.0'\n\n implementation 'io.reactivex.rxjava2:rxjava:2.2.19'\n implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'\n\n // ViewModel and LiveData\n implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'\n\n //LeakCanary\n debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.10'\n\n testImplementation 'junit:junit:4.13.2'\n androidTestImplementation 'androidx.test.ext:junit:1.1.5'\n androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'\n\n implementation project(':bitcoinkit')\n implementation project(':dashkit')\n implementation project(':bitcoincashkit')\n implementation project(':litecoinkit')\n implementation project(':ecashkit')\n}\n" }, { "path": "app/proguard-rules.pro", "content": "# Add project specific ProGuard rules here.\n# You can control the set of applied configuration files using the\n# proguardFiles setting in build.gradle.\n#\n# For more details, see\n# http://developer.android.com/guide/developing/tools/proguard.html\n\n# If your project uses WebView with JS, uncomment the following\n# and specify the fully qualified class name to the JavaScript interface\n# class:\n#-keepclassmembers class fqcn.of.javascript.interface.for.webview {\n# public *;\n#}\n\n# Uncomment this to preserve the line number information for\n# debugging stack traces.\n#-keepattributes SourceFile,LineNumberTable\n\n# If you keep the line number information, uncomment this to\n# hide the original source file name.\n#-renamesourcefileattribute SourceFile\n" }, { "path": "app/src/main/AndroidManifest.xml", "content": "\n\n\n \n\n \n \n \n \n\n \n \n \n \n\n" }, { "path": "app/src/main/java/io/horizontalsystems/bitcoinkit/demo/App.kt", "content": "package io.horizontalsystems.bitcoinkit.demo\n\nimport android.app.Application\n\nclass App : Application() {\n\n override fun onCreate() {\n super.onCreate()\n\n instance = this\n }\n\n companion object {\n lateinit var instance: App\n private set\n }\n\n}\n" }, { "path": "app/src/main/java/io/horizontalsystems/bitcoinkit/demo/BalanceFragment.kt", "content": "package io.horizontalsystems.bitcoinkit.demo\n\nimport androidx.lifecycle.Observer\nimport android.os.Bundle\nimport androidx.fragment.app.Fragment\nimport android.view.LayoutInflater\nimport android.view.View\nimport android.view.ViewGroup\nimport android.widget.Button\nimport android.widget.TextView\nimport androidx.appcompat.app.AlertDialog\nimport androidx.lifecycle.ViewModelProvider\nimport io.horizontalsystems.bitcoincore.BitcoinCore\nimport java.text.SimpleDateFormat\nimport java.util.*\n\nclass BalanceFragment : Fragment() {\n\n lateinit var viewModel: MainViewModel\n lateinit var networkName: TextView\n lateinit var balanceValue: TextView\n lateinit var balanceUnspendableValue: TextView\n lateinit var lastBlockDateValue: TextView\n lateinit var lastBlockValue: TextView\n lateinit var stateValue: TextView\n lateinit var startButton: Button\n lateinit var clearButton: Button\n lateinit var buttonDebug: Button\n lateinit var buttonStatus: Button\n\n override fun onCreate(savedInstanceState: Bundle?) {\n super.onCreate(savedInstanceState)\n\n viewModel = activity?.let { ViewModelProvider(it).get(MainViewModel::class.java) } ?: return\n\n viewModel.balance.observe(this, Observer { balance ->\n when (balance) {\n null -> {\n balanceValue.text = \"\"\n balanceUnspendableValue.text = \"\"\n }\n else -> {\n balanceValue.text = NumberFormatHelper.cryptoAmountFormat.format(balance.spendable / 100_000_000.0)\n balanceUnspendableValue.text = NumberFormatHelper.cryptoAmountFormat.format((balance.unspendableTimeLocked + balance.unspendableNotRelayed) / 100_000_000.0)\n }\n }\n })\n\n val dateFormat = SimpleDateFormat(\"yyyy-MM-dd HH:mm:ss\", Locale.US)\n viewModel.lastBlock.observe(this, Observer {\n it?.let { blockInfo ->\n lastBlockValue.text = blockInfo.height.toString()\n\n val strDate = dateFormat.format(Date(blockInfo.timestamp * 1000))\n lastBlockDateValue.text = strDate\n }\n })\n\n viewModel.state.observe(this, Observer { state ->\n when (state) {\n is BitcoinCore.KitState.Synced -> {\n stateValue.text = \"synced\"\n }\n is BitcoinCore.KitState.ApiSyncing -> {\n stateValue.text = \"api syncing ${state.transactions} txs\"\n }\n is BitcoinCore.KitState.Syncing -> {\n stateValue.text = \"syncing ${\"%.3f\".format(state.progress)}\"\n }\n is BitcoinCore.KitState.NotSynced -> {\n stateValue.text = \"not synced ${state.exception.javaClass.simpleName}\"\n }\n }\n })\n\n viewModel.status.observe(this, Observer {\n when (it) {\n MainViewModel.State.STARTED -> {\n startButton.isEnabled = false\n }\n else -> {\n startButton.isEnabled = true\n }\n }\n })\n\n viewModel.statusInfo.observe(this, Observer { statusInfo ->\n activity?.let {\n val dialog = AlertDialog.Builder(it)\n .setMessage(formatMapToString(statusInfo))\n .setTitle(\"Status Info\")\n .create()\n dialog.show()\n }\n })\n }\n\n override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {\n return inflater.inflate(R.layout.fragment_balance, container, false)\n }\n\n override fun onViewCreated(view: View, savedInstanceState: Bundle?) {\n super.onViewCreated(view, savedInstanceState)\n\n networkName = view.findViewById(R.id.networkName)\n networkName.text = viewModel.networkName\n\n balanceValue = view.findViewById(R.id.balanceValue)\n balanceUnspendableValue = view.findViewById(R.id.balanceUnspendableValue)\n lastBlockValue = view.findViewById(R.id.lastBlockValue)\n lastBlockDateValue = view.findViewById(R.id.lastBlockDateValue)\n stateValue = view.findViewById(R.id.stateValue)\n startButton = view.findViewById(R.id.buttonStart)\n clearButton = view.findViewById(R.id.buttonClear)\n buttonDebug = view.findViewById(R.id.buttonDebug)\n buttonStatus = view.findViewById(R.id.buttonStatus)\n\n startButton.setOnClickListener {\n viewModel.start()\n }\n\n clearButton.setOnClickListener {\n viewModel.clear()\n }\n\n buttonDebug.setOnClickListener {\n viewModel.showDebugInfo()\n }\n\n buttonStatus.setOnClickListener {\n viewModel.showStatusInfo()\n }\n }\n\n @Suppress(\"UNCHECKED_CAST\")\n private fun formatMapToString(status: Map?, indentation: String = \"\", bullet: String = \"\", level: Int = 0): String? {\n if (status == null)\n return null\n\n val sb = StringBuilder()\n status.toList().forEach { (key, value) ->\n val title = \"$indentation$bullet$key\"\n when (value) {\n is Map<*, *> -> {\n val formattedValue = formatMapToString(value as? Map, \"\\t\\t$indentation\", \" - \", level + 1)\n sb.append(\"$title:\\n$formattedValue${if (level < 2) \"\\n\" else \"\"}\")\n }\n else -> {\n sb.appendln(\"$title: $value\")\n }\n }\n }\n\n val statusString = sb.trimEnd()\n\n return if (statusString.isEmpty()) \"\" else \"$statusString\\n\"\n }\n\n}\n" }, { "path": "app/src/main/java/io/horizontalsystems/bitcoinkit/demo/FeePriority.kt", "content": "package io.horizontalsystems.bitcoinkit.demo\n\nsealed class FeePriority(val feeRate: Int) {\n object Low : FeePriority(5)\n object Medium : FeePriority(10)\n object High : FeePriority(15)\n}\n" }, { "path": "app/src/main/java/io/horizontalsystems/bitcoinkit/demo/MainActivity.kt", "content": "package io.horizontalsystems.bitcoinkit.demo\n\nimport android.os.Bundle\nimport com.google.android.material.bottomnavigation.BottomNavigationView\nimport androidx.fragment.app.Fragment\nimport androidx.appcompat.app.AppCompatActivity\nimport android.view.MenuItem\nimport androidx.lifecycle.ViewModelProvider\n\nclass MainActivity : AppCompatActivity(), BottomNavigationView.OnNavigationItemSelectedListener {\n\n private val balanceFragment = BalanceFragment()\n private val transactionsFragment = TransactionsFragment()\n private val sendReceiveFragment = SendReceiveFragment()\n private val fm = supportFragmentManager\n private var active: Fragment = balanceFragment\n\n lateinit var viewModel: MainViewModel\n\n override fun onCreate(savedInstanceState: Bundle?) {\n super.onCreate(savedInstanceState)\n setContentView(R.layout.activity_main)\n\n val navigation = findViewById(R.id.navigation)\n navigation.setOnNavigationItemSelectedListener(this)\n\n fm.beginTransaction().add(R.id.fragment_container, sendReceiveFragment, \"3\").hide(sendReceiveFragment).commit()\n fm.beginTransaction().add(R.id.fragment_container, transactionsFragment, \"2\").hide(transactionsFragment).commit()\n fm.beginTransaction().add(R.id.fragment_container, balanceFragment, \"1\").commit()\n\n viewModel = ViewModelProvider(this).get(MainViewModel::class.java)\n viewModel.init()\n }\n\n override fun onNavigationItemSelected(item: MenuItem): Boolean {\n val fragment = when (item.itemId) {\n R.id.navigation_home -> balanceFragment\n R.id.navigation_transactions -> transactionsFragment\n R.id.navigation_send_receive -> sendReceiveFragment\n else -> null\n }\n\n if (fragment != null) {\n supportFragmentManager\n .beginTransaction()\n .hide(active)\n .show(fragment)\n .commit()\n\n active = fragment\n\n return true\n }\n\n return false\n }\n\n}\n" }, { "path": "app/src/main/java/io/horizontalsystems/bitcoinkit/demo/MainViewModel.kt", "content": "package io.horizontalsystems.bitcoinkit.demo\n\nimport androidx.lifecycle.MutableLiveData\nimport androidx.lifecycle.ViewModel\nimport io.horizontalsystems.bitcoincore.BitcoinCore\nimport io.horizontalsystems.bitcoincore.BitcoinCore.KitState\nimport io.horizontalsystems.bitcoincore.core.IPluginData\nimport io.horizontalsystems.bitcoincore.exceptions.AddressFormatException\nimport io.horizontalsystems.bitcoincore.managers.SendValueErrors\nimport io.horizontalsystems.bitcoincore.models.BalanceInfo\nimport io.horizontalsystems.bitcoincore.models.BitcoinSendInfo\nimport io.horizontalsystems.bitcoincore.models.BlockInfo\nimport io.horizontalsystems.bitcoincore.models.TransactionDataSortType\nimport io.horizontalsystems.bitcoincore.models.TransactionFilterType\nimport io.horizontalsystems.bitcoincore.models.TransactionInfo\nimport io.horizontalsystems.bitcoincore.storage.UtxoFilters\nimport io.horizontalsystems.bitcoinkit.BitcoinKit\nimport io.horizontalsystems.hdwalletkit.HDWallet.Purpose\nimport io.horizontalsystems.hodler.HodlerData\nimport io.horizontalsystems.hodler.HodlerPlugin\nimport io.horizontalsystems.hodler.LockTimeInterval\nimport io.reactivex.disposables.CompositeDisposable\n\nclass MainViewModel : ViewModel(), BitcoinKit.Listener {\n\n enum class State {\n STARTED, STOPPED\n }\n\n private var transactionFilterType: TransactionFilterType? = null\n val types = listOf(null) + TransactionFilterType.values()\n\n val transactions = MutableLiveData>()\n val balance = MutableLiveData()\n val lastBlock = MutableLiveData()\n val state = MutableLiveData()\n val status = MutableLiveData()\n val transactionRaw = MutableLiveData()\n val statusInfo = MutableLiveData>()\n lateinit var networkName: String\n private val disposables = CompositeDisposable()\n\n private var started = false\n set(value) {\n field = value\n status.value = (if (value) State.STARTED else State.STOPPED)\n }\n\n private lateinit var bitcoinKit: BitcoinKit\n\n private val walletId = \"MyWallet\"\n private val networkType = BitcoinKit.NetworkType.MainNet\n private val syncMode = BitcoinCore.SyncMode.Api()\n private val purpose = Purpose.BIP44\n\n fun init() {\n //TODO create unique seed phrase,perhaps using shared preferences?\n val words = \"used ugly meat glad balance divorce inner artwork hire invest already piano\".split(\" \")\n val passphrase = \"\"\n\n bitcoinKit = BitcoinKit(App.instance, words, passphrase, walletId, networkType, syncMode = syncMode, purpose = purpose)\n\n bitcoinKit.listener = this\n\n networkName = bitcoinKit.networkName\n balance.value = bitcoinKit.balance\n\n lastBlock.value = bitcoinKit.lastBlockInfo\n state.value = bitcoinKit.syncState\n\n started = false\n }\n\n fun start() {\n if (started) return\n started = true\n\n bitcoinKit.start()\n }\n\n fun clear() {\n bitcoinKit.stop()\n BitcoinKit.clear(App.instance, networkType, walletId)\n\n init()\n }\n\n\n fun showDebugInfo() {\n bitcoinKit.showDebugInfo()\n }\n\n fun showStatusInfo() {\n statusInfo.postValue(bitcoinKit.statusInfo())\n }\n\n //\n // BitcoinKit Listener implementations\n //\n override fun onTransactionsUpdate(inserted: List, updated: List) {\n setTransactionFilterType(transactionFilterType)\n }\n\n override fun onTransactionsDelete(hashes: List) {\n }\n\n override fun onBalanceUpdate(balance: BalanceInfo) {\n this.balance.postValue(balance)\n }\n\n override fun onLastBlockInfoUpdate(blockInfo: BlockInfo) {\n this.lastBlock.postValue(blockInfo)\n }\n\n override fun onKitStateUpdate(state: KitState) {\n this.state.postValue(state)\n }\n\n val receiveAddressLiveData = MutableLiveData()\n val feeLiveData = MutableLiveData()\n val errorLiveData = MutableLiveData()\n val addressLiveData = MutableLiveData()\n val amountLiveData = MutableLiveData()\n\n var amount: Long? = null\n set(value) {\n field = value\n updateFee()\n }\n\n var address: String? = null\n set(value) {\n field = value\n updateFee()\n }\n\n var feePriority: FeePriority = FeePriority.Medium\n set(value) {\n field = value\n updateFee()\n }\n\n var timeLockInterval: LockTimeInterval? = null\n set(value) {\n field = value\n updateFee()\n }\n\n fun onReceiveClick() {\n receiveAddressLiveData.value = bitcoinKit.receiveAddress()\n }\n\n fun onSendClick() {\n when {\n address.isNullOrBlank() -> {\n errorLiveData.value = \"Send address cannot be blank\"\n }\n amount == null -> {\n errorLiveData.value = \"Send amount cannot be blank\"\n }\n else -> {\n try {\n val transaction = bitcoinKit.send(\n address!!,\n null,\n amount!!,\n feeRate = feePriority.feeRate,\n sortType = TransactionDataSortType.Shuffle,\n pluginData = getPluginData(),\n rbfEnabled = true,\n changeToFirstInput = false,\n filters = UtxoFilters()\n )\n\n amountLiveData.value = null\n feeLiveData.value = null\n addressLiveData.value = null\n errorLiveData.value = \"Transaction sent ${transaction.header.serializedTxInfo}\"\n } catch (e: Exception) {\n errorLiveData.value = when (e) {\n is SendValueErrors.InsufficientUnspentOutputs,\n is SendValueErrors.EmptyOutputs -> \"Insufficient balance\"\n is AddressFormatException -> \"Could not Format Address\"\n else -> e.message ?: \"Failed to send transaction (${e.javaClass.name})\"\n }\n\n }\n }\n }\n }\n\n fun onMaxClick() {\n try {\n amountLiveData.value = bitcoinKit.maximumSpendableValue(\n address,\n null,\n feePriority.feeRate,\n null,\n getPluginData(),\n false,\n UtxoFilters()\n )\n } catch (e: Exception) {\n amountLiveData.value = 0\n errorLiveData.value = when (e) {\n\n is SendValueErrors.Dust,\n is SendValueErrors.EmptyOutputs -> \"You need at least ${e.message} satoshis to make an transaction\"\n is AddressFormatException -> \"Could not Format Address\"\n else -> e.message ?: \"Maximum could not be calculated\"\n }\n }\n }\n\n private fun updateFee() {\n try {\n feeLiveData.value = amount?.let {\n fee(it, address).fee\n }\n } catch (e: Exception) {\n errorLiveData.value = e.message ?: e.javaClass.simpleName\n }\n }\n\n private fun fee(value: Long, address: String? = null): BitcoinSendInfo {\n return bitcoinKit.sendInfo(\n value,\n address,\n null,\n feeRate = feePriority.feeRate,\n unspentOutputs = null,\n pluginData = getPluginData(),\n changeToFirstInput = false,\n filters = UtxoFilters()\n )\n }\n\n private fun getPluginData(): MutableMap {\n val pluginData = mutableMapOf()\n timeLockInterval?.let {\n pluginData[HodlerPlugin.id] = HodlerData(it)\n }\n return pluginData\n }\n\n fun onRawTransactionClick(transactionHash: String) {\n transactionRaw.postValue(bitcoinKit.getRawTransaction(transactionHash))\n }\n\n fun setTransactionFilterType(transactionFilterType: TransactionFilterType?) {\n this.transactionFilterType = transactionFilterType\n\n bitcoinKit.transactions(type = transactionFilterType).subscribe { txList: List ->\n transactions.postValue(txList)\n }.let {\n disposables.add(it)\n }\n }\n}\n" }, { "path": "app/src/main/java/io/horizontalsystems/bitcoinkit/demo/NumberFormatHelper.kt", "content": "package io.horizontalsystems.bitcoinkit.demo\n\nimport java.text.NumberFormat\n\nobject NumberFormatHelper {\n\n val fiatAmountFormat: NumberFormat\n get() {\n val numberFormat = NumberFormat.getInstance()\n numberFormat.maximumFractionDigits = 2\n numberFormat.minimumFractionDigits = 2\n return numberFormat\n }\n\n val cryptoAmountFormat: NumberFormat\n get() {\n val numberFormat = NumberFormat.getInstance()\n numberFormat.maximumFractionDigits = 12\n numberFormat.minimumFractionDigits = 2\n return numberFormat\n }\n\n}\n" }, { "path": "app/src/main/java/io/horizontalsystems/bitcoinkit/demo/SendReceiveFragment.kt", "content": "package io.horizontalsystems.bitcoinkit.demo\n\nimport android.os.Bundle\nimport android.text.Editable\nimport android.text.TextWatcher\nimport android.view.Gravity\nimport android.view.LayoutInflater\nimport android.view.View\nimport android.view.ViewGroup\nimport android.widget.AdapterView\nimport android.widget.ArrayAdapter\nimport android.widget.Button\nimport android.widget.EditText\nimport android.widget.RadioGroup\nimport android.widget.Spinner\nimport android.widget.TextView\nimport android.widget.Toast\nimport androidx.fragment.app.Fragment\nimport androidx.lifecycle.Observer\nimport androidx.lifecycle.ViewModelProvider\nimport io.horizontalsystems.hodler.LockTimeInterval\n\nclass SendReceiveFragment : Fragment() {\n private lateinit var viewModel: MainViewModel\n\n lateinit var receiveAddressText: TextView\n lateinit var receiveAddressButton: Button\n lateinit var sendAmount: EditText\n lateinit var sendAddress: EditText\n lateinit var txFeeValue: TextView\n lateinit var sendButton: Button\n lateinit var maxButton: Button\n lateinit var radioGroup: RadioGroup\n lateinit var lockTimePeriodValue: Spinner\n\n override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {\n return inflater.inflate(R.layout.fragment_send_receive, container, false)\n }\n\n override fun onActivityCreated(savedInstanceState: Bundle?) {\n super.onActivityCreated(savedInstanceState)\n\n viewModel = activity?.let { ViewModelProvider(it).get(MainViewModel::class.java) } ?: return\n\n viewModel.receiveAddressLiveData.observe(viewLifecycleOwner, Observer {\n receiveAddressText.text = it\n })\n\n viewModel.amountLiveData.observe(viewLifecycleOwner, Observer {\n sendAmount.setText(it?.toString())\n })\n\n viewModel.addressLiveData.observe(viewLifecycleOwner, Observer {\n sendAddress.setText(it)\n })\n\n viewModel.feeLiveData.observe(viewLifecycleOwner, Observer {\n txFeeValue.text = it?.toString()\n })\n\n viewModel.errorLiveData.observe(viewLifecycleOwner, Observer {\n //TODO TOASTS NO PREVIOUS OUTPUT SCRIPT CHANGE THE SEED?\n val toast = Toast.makeText(context, \"$it\", Toast.LENGTH_LONG)\n\n toast.setGravity(Gravity.CENTER, 0, 0)\n toast.show()\n })\n\n }\n\n override fun onViewCreated(view: View, savedInstanceState: Bundle?) {\n super.onViewCreated(view, savedInstanceState)\n\n receiveAddressText = view.findViewById(R.id.receiveAddressText)\n receiveAddressButton = view.findViewById(R.id.receiveAddressButton)\n sendAmount = view.findViewById(R.id.sendAmount)\n sendAddress = view.findViewById(R.id.sendAddress)\n txFeeValue = view.findViewById(R.id.txFeeValue)\n sendButton = view.findViewById(R.id.sendButton)\n maxButton = view.findViewById(R.id.maxButton)\n radioGroup = view.findViewById(R.id.radioGroup)\n lockTimePeriodValue = view.findViewById(R.id.lockTimePeriodValue)\n\n receiveAddressButton.setOnClickListener {\n viewModel.onReceiveClick()\n }\n\n sendButton.setOnClickListener {\n viewModel.onSendClick()\n }\n\n maxButton.setOnClickListener {\n\n\n viewModel.onMaxClick()\n\n }\n\n sendAmount.addTextChangedListener(SimpleTextWatcher {\n viewModel.amount = try {\n sendAmount.text?.toString()?.toLong()\n } catch (e: NumberFormatException) {\n null\n }\n })\n\n sendAddress.addTextChangedListener(SimpleTextWatcher {\n viewModel.address = sendAddress.text.toString()\n })\n\n radioGroup.setOnCheckedChangeListener { _, checkedId ->\n val feePriority = when (checkedId) {\n R.id.radioLow -> FeePriority.Low\n R.id.radioMedium -> FeePriority.Medium\n R.id.radioHigh -> FeePriority.High\n else -> throw Exception(\"Undefined priority\")\n }\n viewModel.feePriority = feePriority\n }\n\n\n lockTimePeriodValue.adapter = ArrayAdapter(view.context, android.R.layout.simple_spinner_dropdown_item, LockTimeIntervalOption.getIntervals())\n lockTimePeriodValue.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {\n override fun onNothingSelected(parent: AdapterView<*>?) = Unit\n\n override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {\n viewModel.timeLockInterval = (parent?.getItemAtPosition(position) as LockTimeIntervalOption).interval\n }\n }\n }\n}\n\nclass LockTimeIntervalOption(val interval: LockTimeInterval? = null) {\n override fun toString(): String {\n return interval?.name ?: \"OFF\"\n }\n\n companion object {\n fun getIntervals(): Array {\n return arrayOf(LockTimeIntervalOption()) + LockTimeInterval.values().map { LockTimeIntervalOption(it) }\n }\n }\n}\n\nclass SimpleTextWatcher(private val callback: (s: Editable?) -> Unit) : TextWatcher {\n override fun afterTextChanged(s: Editable?) {\n callback.invoke(s)\n }\n\n override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) = Unit\n override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) = Unit\n}\n" }, { "path": "app/src/main/java/io/horizontalsystems/bitcoinkit/demo/TransactionsFragment.kt", "content": "package io.horizontalsystems.bitcoinkit.demo\n\nimport android.annotation.SuppressLint\nimport android.graphics.Color\nimport android.os.Bundle\nimport android.view.LayoutInflater\nimport android.view.View\nimport android.view.ViewGroup\nimport android.widget.Button\nimport android.widget.TextView\nimport androidx.appcompat.app.AlertDialog\nimport androidx.fragment.app.Fragment\nimport androidx.lifecycle.Observer\nimport androidx.lifecycle.ViewModelProvider\nimport androidx.recyclerview.widget.LinearLayoutManager\nimport androidx.recyclerview.widget.RecyclerView\nimport com.google.android.material.tabs.TabLayout\nimport io.horizontalsystems.bitcoincore.models.TransactionInfo\nimport io.horizontalsystems.bitcoincore.models.TransactionInputInfo\nimport io.horizontalsystems.bitcoincore.models.TransactionOutputInfo\nimport io.horizontalsystems.dashkit.models.DashTransactionInfo\nimport io.horizontalsystems.hodler.HodlerOutputData\nimport io.horizontalsystems.hodler.HodlerPlugin\nimport java.text.DateFormat\nimport java.util.Date\nimport java.util.Locale\n\nclass TransactionsFragment : Fragment(), ViewHolderTransaction.Listener {\n\n private lateinit var viewModel: MainViewModel\n private lateinit var transactionsRecyclerView: RecyclerView\n private val transactionsAdapter = TransactionsAdapter(this)\n\n lateinit var tabs: TabLayout\n\n override fun onCreate(savedInstanceState: Bundle?) {\n super.onCreate(savedInstanceState)\n\n viewModel = activity?.let { ViewModelProvider(it).get(MainViewModel::class.java) } ?: return\n\n viewModel.transactions.observe(this, Observer {\n it?.let { transactions ->\n transactionsAdapter.items = transactions\n transactionsAdapter.notifyDataSetChanged()\n }\n })\n\n viewModel.transactionRaw.observe(this, Observer { transactionHex ->\n activity?.let {\n val dialog = AlertDialog.Builder(it)\n .setMessage(transactionHex)\n .setTitle(\"Transaction HEX\")\n .create()\n\n dialog.show()\n }\n })\n }\n\n override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {\n return inflater.inflate(R.layout.fragment_transactions, container, false)\n }\n\n override fun onViewCreated(view: View, savedInstanceState: Bundle?) {\n super.onViewCreated(view, savedInstanceState)\n\n tabs = view.findViewById(R.id.tabs)\n\n transactionsRecyclerView = view.findViewById(R.id.transactions)\n transactionsRecyclerView.adapter = transactionsAdapter\n transactionsRecyclerView.layoutManager = LinearLayoutManager(context)\n\n viewModel.types.forEach {\n val text = tabs.newTab()\n .setText(it?.name ?: \"All\")\n .setId(it?.ordinal ?: 100)\n\n tabs.addTab(text)\n }\n\n tabs.addOnTabSelectedListener(object : TabLayout.OnTabSelectedListener {\n override fun onTabSelected(tab: TabLayout.Tab) {\n viewModel.setTransactionFilterType(viewModel.types.find {\n it?.ordinal == tab.id\n })\n }\n\n override fun onTabUnselected(tab: TabLayout.Tab?) = Unit\n override fun onTabReselected(tab: TabLayout.Tab?) = Unit\n })\n\n viewModel.setTransactionFilterType(null)\n }\n\n override fun onClickRawTransaction(transactionHash: String) {\n viewModel.onRawTransactionClick(transactionHash)\n }\n}\n\nclass TransactionsAdapter(private val listener: ViewHolderTransaction.Listener) : RecyclerView.Adapter() {\n var items = listOf()\n\n override fun getItemCount() = items.size\n\n override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder =\n ViewHolderTransaction(LayoutInflater.from(parent.context).inflate(R.layout.view_holder_transaction, parent, false), listener)\n\n override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {\n when (holder) {\n is ViewHolderTransaction -> holder.bind(items[position], itemCount - position)\n }\n }\n}\n\nclass ViewHolderTransaction(val containerView: View, private val listener: Listener) : RecyclerView.ViewHolder(containerView) {\n\n interface Listener {\n fun onClickRawTransaction(transactionHash: String)\n }\n\n private val summary = containerView.findViewById(R.id.summary)!!\n private val buttonRaw = containerView.findViewById