Add the Remove Account functionality.

- Created the functionality to completely remove the current user account and its corresponding data from the database and the shared preferences, which will restart the whole application avoiding showing the License again.

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

@@ -9,7 +9,6 @@ import android.util.Log
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.widget.Toast
 import androidx.appcompat.widget.Toolbar
 import androidx.collection.LongSparseArray
 import androidx.lifecycle.ViewModelProviders
@@ -508,12 +507,31 @@ class SettingsFragment : ConnectedFragment(), BaseSecurityLockDialog.OnPINPatter
                 message(R.string.msg__remove_account_confirmation)
                 negativeButton(android.R.string.cancel)
                 positiveButton(android.R.string.ok) {
-                    Toast.makeText(it.context, "Removing Account", Toast.LENGTH_SHORT).show()
+                    removeAccount(it.context)
                 }
             }
         }
     }
 
+    private fun removeAccount(context: Context) {
+        // Clears the database.
+        mViewModel.clearDatabase(context)
+
+        // Clears the shared preferences.
+        val pref = PreferenceManager.getDefaultSharedPreferences(context)
+        pref.edit().clear().apply()
+
+        // Marks the license as agreed, so that it is not shown to the user again.
+        pref.edit().putInt(
+            Constants.KEY_LAST_AGREED_LICENSE_VERSION, Constants.CURRENT_LICENSE_VERSION).apply()
+
+        // Restarts the activity, which will restart the whole application since it uses a
+        // single activity architecture.
+        val intent = activity?.intent
+        activity?.finish()
+        activity?.startActivity(intent)
+    }
+
     override fun onServiceDisconnected(name: ComponentName?) {
         super.onServiceDisconnected(name)
 

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

@@ -1,11 +1,17 @@
 package cy.agorise.bitsybitshareswallet.viewmodels
 
 import android.app.Application
+import android.content.Context
 import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.LiveData
+import androidx.lifecycle.viewModelScope
+import cy.agorise.bitsybitshareswallet.database.BitsyDatabase
 import cy.agorise.bitsybitshareswallet.database.entities.UserAccount
 import cy.agorise.bitsybitshareswallet.repositories.AuthorityRepository
 import cy.agorise.bitsybitshareswallet.repositories.UserAccountRepository
+import kotlinx.coroutines.Dispatchers.IO
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 
 class SettingsFragmentViewModel(application: Application) : AndroidViewModel(application) {
     private var mUserAccountRepository = UserAccountRepository(application)
@@ -18,4 +24,13 @@ class SettingsFragmentViewModel(application: Application) : AndroidViewModel(app
     internal fun getWIF(userId: String, authorityType: Int): LiveData<String> {
         return mAuthorityRepository.getWIF(userId, authorityType)
     }
+
+    internal fun clearDatabase(context: Context) {
+        val db = BitsyDatabase.getDatabase(context)
+        viewModelScope.launch {
+            withContext(IO) {
+                db?.clearAllTables()
+            }
+        }
+    }
 }