Avoid crash due to unsupported currency locale.

- Avoided a crash in ConnectedActivity when trying to obtain the Locale's associated currency, when a Locale does not have a currency.
- Standardized the process to obtain the coingecko supported currency, which will first try to use the current locale's currency and fallback to USD in case the first is not supported.

app/src/main/java/cy/agorise/bitsybitshareswallet/activities/ConnectedActivity.kt

@@ -19,6 +19,7 @@ import cy.agorise.bitsybitshareswallet.database.entities.Transfer
 import cy.agorise.bitsybitshareswallet.processors.TransfersLoader
 import cy.agorise.bitsybitshareswallet.repositories.AssetRepository
 import cy.agorise.bitsybitshareswallet.utils.Constants
+import cy.agorise.bitsybitshareswallet.utils.Helper
 import cy.agorise.bitsybitshareswallet.viewmodels.BalanceViewModel
 import cy.agorise.bitsybitshareswallet.viewmodels.ConnectedActivityViewModel
 import cy.agorise.bitsybitshareswallet.viewmodels.TransferViewModel
@@ -121,7 +122,9 @@ abstract class ConnectedActivity : AppCompatActivity() {
         mConnectedActivityViewModel = ViewModelProviders.of(this).get(ConnectedActivityViewModel::class.java)
 
         val currency = Currency.getInstance(Locale.getDefault())
-        mConnectedActivityViewModel.observeMissingEquivalentValuesIn(currency.currencyCode) //TODO: Obtain this from shared preferences?
+        val currencyCode = Helper.getCoingeckoSupportedCurrency(currency.currencyCode)
+        Log.d(TAG, "Using currency: ${currencyCode.toUpperCase(Locale.ROOT)}")
+        mConnectedActivityViewModel.observeMissingEquivalentValuesIn(currencyCode)
 
         // Configure UserAccountViewModel to obtain the missing account ids
         mUserAccountViewModel = ViewModelProviders.of(this).get(UserAccountViewModel::class.java)

app/src/main/java/cy/agorise/bitsybitshareswallet/fragments/FilterOptionsDialog.kt

@@ -18,6 +18,7 @@ import cy.agorise.bitsybitshareswallet.adapters.BalancesDetailsAdapter
 import cy.agorise.bitsybitshareswallet.database.joins.BalanceDetail
 import cy.agorise.bitsybitshareswallet.models.FilterOptions
 import cy.agorise.bitsybitshareswallet.utils.Constants
+import cy.agorise.bitsybitshareswallet.utils.Helper
 import cy.agorise.bitsybitshareswallet.viewmodels.BalanceDetailViewModel
 import cy.agorise.bitsybitshareswallet.views.DatePickerFragment
 import kotlinx.android.synthetic.main.dialog_filter_options.*
@@ -158,9 +159,9 @@ class FilterOptionsDialog : DialogFragment(), DatePickerFragment.OnDateSetListen
             llEquivalentValue.visibility = if(isChecked) View.GONE else View.VISIBLE }
         cbEquivalentValue.isChecked = mFilterOptions.equivalentValueAll
 
-        // TODO obtain user selected currency
+        val currency = Currency.getInstance(Locale.getDefault())
-        val currencySymbol = "usd"
+        val currencyCode = Helper.getCoingeckoSupportedCurrency(currency.currencyCode)
-        mCurrency = Currency.getInstance(currencySymbol)
+        mCurrency = Currency.getInstance(currencyCode)
 
         val fromEquivalentValue = mFilterOptions.fromEquivalentValue /
                 Math.pow(10.0, mCurrency.defaultFractionDigits.toDouble()).toLong()
@@ -170,7 +171,7 @@ class FilterOptionsDialog : DialogFragment(), DatePickerFragment.OnDateSetListen
                 Math.pow(10.0, mCurrency.defaultFractionDigits.toDouble()).toLong()
         etToEquivalentValue.setText("$toEquivalentValue", TextView.BufferType.EDITABLE)
 
-        tvEquivalentValueSymbol.text = currencySymbol.toUpperCase()
+        tvEquivalentValueSymbol.text = currencyCode.toUpperCase(Locale.getDefault())
 
         // Initialize transaction network fees
         switchAgoriseFees.isChecked = mFilterOptions.agoriseFees

app/src/main/java/cy/agorise/bitsybitshareswallet/network/CoingeckoService.kt

@@ -13,8 +13,4 @@ interface CoingeckoService {
     fun getHistoricalValueSync(@Query("id") id: String,
                                @Query("date") date: String,
                                @Query("localization") localization: Boolean): Call<HistoricalPrice>
-
-    @Headers("Content-Type: application/json")
-    @GET("/api/v3/simple/supported_vs_currencies")
-    fun getSupportedCurrencies(): Call<Array<String>>
 }

app/src/main/java/cy/agorise/bitsybitshareswallet/repositories/TransferRepository.kt

@@ -14,7 +14,6 @@ import cy.agorise.bitsybitshareswallet.database.entities.Transfer
 import cy.agorise.bitsybitshareswallet.network.CoingeckoService
 import cy.agorise.bitsybitshareswallet.network.ServiceGenerator
 import cy.agorise.bitsybitshareswallet.utils.Constants
-import io.reactivex.Observable
 import io.reactivex.Single
 import io.reactivex.disposables.CompositeDisposable
 import java.text.SimpleDateFormat
@@ -164,41 +163,4 @@ class TransferRepository internal constructor(context: Context) {
         if(!compositeDisposable.isDisposed)
             compositeDisposable.clear()
     }
-
-    /**
-     * Method used to override a given currency if it turns out not to be supported by the API.
-     * <p>
-     * The CoinGecko API supports 20+ fiat currencies. So we can very easily calculate historical
-     * equivalent values for those currencies. If the currency is not supported though,
-     * we must fall back to USD.
-     *
-     * @param   symbol  The 3 letters symbol of the currency
-     */
-    fun getSupportedCurrency(symbol: String): Observable<String> {
-        return Observable.just(symbol)
-            .map {
-                val sg = ServiceGenerator(Constants.COINGECKO_URL)
-                val response = sg.getService(CoingeckoService::class.java)
-                    ?.getSupportedCurrencies()
-                    ?.execute()
-                // Updating the supported currencies cache
-                mPreferences.edit()
-                    .putStringSet(Constants.KEY_COINGECKO_CURRENCIES_CACHE, response?.body()?.toMutableSet() ?: setOf())
-                    .apply()
-                if(response?.body()?.indexOf(symbol.toLowerCase()) == -1)
-                    "usd"
-                else
-                    it
-            }
-            .onErrorReturn {
-                // Error caused potentially by the lack of connectivity. If this happens we just
-                // retrieve the value from the cache
-                val currencies = mPreferences.getStringSet(Constants.KEY_COINGECKO_CURRENCIES_CACHE, setOf())
-                var selectedCurrency = "usd"
-                if(currencies.contains(symbol)) {
-                    selectedCurrency = symbol
-                }
-                selectedCurrency
-            }
-    }
 }

app/src/main/java/cy/agorise/bitsybitshareswallet/utils/Helper.kt

@@ -10,14 +10,13 @@ import androidx.core.content.FileProvider
 import java.io.File
 import java.io.FileOutputStream
 import java.io.IOException
+import java.util.*
 
 /**
  * Contains methods that are helpful in different parts of the app
  */
-class Helper {
+object Helper {
-
+    private const val TAG = "Helper"
-    companion object {
-        private val TAG = "Helper"
 
     /**
      * Creates and returns a Bitmap from the contents of a View, does not matter
@@ -42,7 +41,7 @@ class Helper {
             // don't forget to make the directory
                 Log.d(TAG, "shareBitmapImage creating cache images folder")
 
-                val stream = FileOutputStream(cachePath.toString() + "/image.png") // overwrites this image every time
+            val stream = FileOutputStream("$cachePath/image.png") // overwrites this image every time
             bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream)
             stream.close()
         } catch (e: IOException) {
@@ -56,5 +55,19 @@ class Helper {
         // Create and return image uri
         return FileProvider.getUriForFile(context, "cy.agorise.bitsybitshareswallet.FileProvider", newFile)
     }
+
+    /**
+     * If the given currency code is supported, returns it, else returns the default one.
+     */
+    fun getCoingeckoSupportedCurrency(currencyCode: String): String {
+        val supportedCurrencies = setOf("usd", "aed", "ars", "aud", "bdt", "bhd", "bmd", "brl", "cad",
+            "chf", "clp", "cny", "czk", "dkk", "eur", "gbp", "hkd", "huf", "idr", "ils", "inr", "jpy",
+            "krw", "kwd", "lkr", "mmk", "mxn", "myr", "nok", "nzd", "php", "pkr", "pln", "rub", "sar",
+            "sek", "sgd", "thb", "try", "twd", "uah", "vef", "vnd", "zar", "xdr", "xag", "xau")
+
+        return if (currencyCode.toLowerCase(Locale.ROOT) in supportedCurrencies)
+            currencyCode
+        else
+            "usd"
     }
 }

app/src/main/java/cy/agorise/bitsybitshareswallet/viewmodels/ConnectedActivityViewModel.kt

@@ -1,14 +1,12 @@
 package cy.agorise.bitsybitshareswallet.viewmodels
 
 import android.app.Application
-import android.util.Log
 import androidx.lifecycle.AndroidViewModel
 import cy.agorise.bitsybitshareswallet.database.BitsyDatabase
 import cy.agorise.bitsybitshareswallet.repositories.EquivalentValuesRepository
 import cy.agorise.bitsybitshareswallet.repositories.NodeRepository
 import cy.agorise.bitsybitshareswallet.repositories.TransferRepository
 import cy.agorise.graphenej.network.FullNode
-import io.reactivex.schedulers.Schedulers
 
 class ConnectedActivityViewModel(application: Application) : AndroidViewModel(application) {
     companion object {
@@ -24,17 +22,7 @@ class ConnectedActivityViewModel(application: Application) : AndroidViewModel(ap
     }
 
     fun observeMissingEquivalentValuesIn(symbol: String) {
-        mTransfersRepository.getSupportedCurrency(symbol)
+        mTransfersRepository.observeMissingEquivalentValuesIn(symbol)
-            .observeOn(Schedulers.io())
-            .subscribeOn(Schedulers.io())
-            .subscribe({
-                currency -> mTransfersRepository.observeMissingEquivalentValuesIn(currency)
-            },{
-                Log.e(TAG,"Error while trying to subscribe to missing equivalent values observer. Msg: ${it.message}")
-                for(element in it.stackTrace){
-                    Log.e(TAG,"${element.className}#${element.methodName}:${element.lineNumber}")
-                }
-            })
     }
 
     fun updateNodeLatencies(nodes: List<FullNode>) {

app/src/main/java/cy/agorise/bitsybitshareswallet/viewmodels/TransactionsViewModel.kt

@@ -1,14 +1,11 @@
 package cy.agorise.bitsybitshareswallet.viewmodels
 
 import android.app.Application
-import android.util.Log
 import androidx.lifecycle.*
 import cy.agorise.bitsybitshareswallet.database.joins.TransferDetail
 import cy.agorise.bitsybitshareswallet.models.FilterOptions
 import cy.agorise.bitsybitshareswallet.repositories.TransferDetailRepository
-import cy.agorise.bitsybitshareswallet.repositories.TransferRepository
+import cy.agorise.bitsybitshareswallet.utils.Helper
-import io.reactivex.android.schedulers.AndroidSchedulers
-import io.reactivex.schedulers.Schedulers
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
@@ -16,10 +13,9 @@ import java.util.*
 
 class TransactionsViewModel(application: Application) : AndroidViewModel(application) {
     companion object {
-        val TAG = "TransactionsViewModel"
+        const val TAG = "TransactionsViewModel"
     }
     private var mRepository = TransferDetailRepository(application)
-    private var mTransfersRepository = TransferRepository(application)
 
     /**
      * [FilterOptions] used to filter the list of [TransferDetail] taken from the database
@@ -44,24 +40,14 @@ class TransactionsViewModel(application: Application) : AndroidViewModel(applica
 
     internal fun getFilteredTransactions(userId: String): LiveData<List<TransferDetail>> {
         val currency = Currency.getInstance(Locale.getDefault())
-        mTransfersRepository.getSupportedCurrency(currency.currencyCode)
+        val currencyCode = Helper.getCoingeckoSupportedCurrency(currency.currencyCode)
-            .subscribeOn(Schedulers.io())
+        transactions = mRepository.getAll(userId, currencyCode)
-            .observeOn(AndroidSchedulers.mainThread())
-            .subscribe({
-                Log.d(TAG,"Looking for currency with code: ${it}")
-                transactions = mRepository.getAll(userId, it)
 
         filteredTransactions.addSource(transactions) { transactions ->
             viewModelScope.launch {
                 filteredTransactions.value = filter(transactions, mFilterOptions)
             }
         }
-            },{
-                Log.e(TAG,"Error while trying to obtain a filtered list of transactions. Msg: ${it.message}")
-                for(element in it.stackTrace){
-                    Log.e(ConnectedActivityViewModel.TAG,"${element.className}#${element.methodName}:${element.lineNumber}")
-                }
-            })
 
         return filteredTransactions
     }