retrieving an account balance

wallet_app/android/app/build.gradle.kts

@@ -1,6 +1,8 @@
 plugins {
     alias(libs.plugins.android.application)
     alias(libs.plugins.jetbrains.kotlin.android)
+    id("com.google.dagger.hilt.android")
+    id("kotlin-kapt")
 }
 
 android {
@@ -93,6 +95,16 @@ dependencies {
 
     implementation(libs.androidx.navigation.compose)
 
+    implementation (libs.retrofit)
+    implementation(libs.converter.gson)
+    implementation (libs.kotlinx.coroutines.core)
+    implementation (libs.kotlinx.coroutines.android)
+
+    implementation("com.google.dagger:hilt-android:2.50")
+    kapt("com.google.dagger:hilt-android-compiler:2.50")
+    kapt("androidx.hilt:hilt-compiler:1.0.0")
+    implementation("androidx.hilt:hilt-navigation-fragment:1.0.0")
+    implementation("androidx.hilt:hilt-navigation-compose:1.0.0-alpha03")
 
     implementation(libs.androidx.core.ktx)
     implementation(libs.androidx.appcompat)

wallet_app/android/app/src/main/AndroidManifest.xml

@@ -2,6 +2,9 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
+    <uses-permission android:name="android.permission.INTERNET" />
+
+
     <application
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"
@@ -33,7 +36,7 @@
             android:exported="true"
             android:theme="@style/Theme.Walletapp"/>
 
-        <activity android:name=".AccountBalanceActivity"
+        <activity android:name=".ui.activity.AccountBalanceActivity"
             android:exported="true"
             android:theme="@style/Theme.Walletapp"/>
 

wallet_app/android/app/src/main/java/com/example/walletapp/MainActivity.kt

@@ -38,6 +38,9 @@ import androidx.compose.ui.unit.sp
 import androidx.core.graphics.toColorInt
 import androidx.core.view.WindowCompat
 import com.example.walletapp.ui.theme.WalletappTheme
+import dagger.hilt.android.AndroidEntryPoint
+import dagger.hilt.android.HiltAndroidApp
+
 
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -127,6 +130,25 @@ fun CreateAccount( modifier: Modifier) {
                     fontSize = 17.sp
                 )
             }
+            Spacer(modifier = Modifier.height(10.dp))
+
+
+            Button(
+                onClick = { val i = Intent(context, WalletActivity::class.java)
+                    context.startActivity(i) },
+                colors = ButtonDefaults.buttonColors(backgroundColor = Color("#EC796B".toColorInt())),
+                shape = RoundedCornerShape(10.dp),
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .height(49.dp)
+            ) {
+                Text(
+                    text = "My Starknet Wallet",
+                    fontFamily = FontFamily(Font(R.font.inter_regular)),
+                    color = Color.White,
+                    fontSize = 17.sp
+                )
+            }
         }
 
         Spacer(modifier = Modifier.height(15.dp))

wallet_app/android/app/src/main/java/com/example/walletapp/WalletActivity.kt

@@ -35,6 +35,7 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.core.graphics.toColorInt
 import androidx.core.view.WindowCompat
+import com.example.walletapp.ui.activity.AccountBalanceActivity
 import com.example.walletapp.ui.theme.WalletappTheme
 
 class WalletActivity : ComponentActivity() {

wallet_app/android/app/src/main/java/com/example/walletapp/data/datasource/RetrofitInstance.kt

@@ -0,0 +1,17 @@
+package com.example.walletapp.data.datasource
+
+import retrofit2.Retrofit
+import retrofit2.converter.gson.GsonConverterFactory
+
+object RetrofitInstance {
+    // Replace this with the actual StarkNet RPC URL
+    private const val BASE_URL = "https://starknet-mainnet.g.alchemy.com/starknet/version/rpc/v0_7/"
+
+    val api: StarknetApiService by lazy {
+        Retrofit.Builder()
+            .baseUrl(BASE_URL)
+            .addConverterFactory(GsonConverterFactory.create())
+            .build()
+            .create(StarknetApiService::class.java)
+    }
+}

wallet_app/android/app/src/main/java/com/example/walletapp/data/datasource/StarknetApiService.kt

@@ -0,0 +1,14 @@
+package com.example.walletapp.data.datasource
+
+import com.example.walletapp.data.model.StarknetResponse
+import com.example.walletapp.data.repository.StarknetCallRequest
+import retrofit2.Call
+import retrofit2.http.Body
+import retrofit2.http.POST
+
+interface StarknetApiService {
+
+
+    @POST("rFAP8fkTAz9TmYw8_V5Fyzxi-WSoQdhk") // rpc end point
+    fun getBalance( @Body request: StarknetCallRequest): Call<StarknetResponse>
+}

wallet_app/android/app/src/main/java/com/example/walletapp/data/model/StarknetResponse.kt

@@ -0,0 +1,8 @@
+package com.example.walletapp.data.model
+
+data class StarknetResponse(
+    val jsonrpc: String,
+    val id: Int,
+    val result: List<String>
+)
+

wallet_app/android/app/src/main/java/com/example/walletapp/data/repository/StarknetCallRequest.kt

@@ -0,0 +1,8 @@
+package com.example.walletapp.data.repository
+
+data class StarknetCallRequest(
+    val id: Int = 1,
+    val jsonrpc: String = "2.0",
+    val method: String = "starknet_call",
+    val params: List<Any>
+)

wallet_app/android/app/src/main/java/com/example/walletapp/data/repository/StarknetRepository.kt

@@ -0,0 +1,26 @@
+package com.example.walletapp.data.repository
+
+import android.util.Log
+import com.example.walletapp.data.datasource.RetrofitInstance
+import com.example.walletapp.data.model.StarknetResponse
+import retrofit2.Call
+
+class StarknetRepository() {
+    fun getAccountBalance(
+        contractAddress: String,
+        accountAddress: String
+    ): Call<StarknetResponse> {
+        val calldata = listOf(accountAddress)
+        val params = listOf(
+            mapOf(
+                "contract_address" to "0x049d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7",
+                "calldata" to listOf("0x02dc260794e4c2eeae87b1403a88385a72c18a5844d220b88117b2965a8cf3a5"),
+                "entry_point_selector" to "0x2e4263afad30923c891518314c3c95dbe830a16874e8abc5777a9a20b54c76e"
+            ),
+            "latest"
+        )
+        val request = StarknetCallRequest(params = params)
+
+        return RetrofitInstance.api.getBalance(request)
+    }
+}