Added method in ReceiveTransactionFragment to generate QR codes encoded using BitShares merchant protocol.

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

@@ -1,13 +1,36 @@
 package cy.agorise.bitsybitshareswallet.fragments
 
+import android.graphics.Bitmap
+import android.graphics.Color
 import android.os.Bundle
+import android.preference.PreferenceManager
+import android.util.Log
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import androidx.fragment.app.Fragment
+import androidx.lifecycle.Observer
+import androidx.lifecycle.ViewModelProviders
+import com.google.common.primitives.UnsignedLong
+import com.google.zxing.BarcodeFormat
+import com.google.zxing.EncodeHintType
+import com.google.zxing.MultiFormatWriter
+import com.google.zxing.WriterException
+import com.google.zxing.common.BitMatrix
 import cy.agorise.bitsybitshareswallet.R
+import cy.agorise.bitsybitshareswallet.utils.Constants
+import cy.agorise.bitsybitshareswallet.viewmodels.UserAccountViewModel
+import cy.agorise.graphenej.*
+import kotlinx.android.synthetic.main.fragment_receive_transaction.*
+import java.util.HashMap
 
 class ReceiveTransactionFragment : Fragment() {
+    private val TAG = this.javaClass.simpleName
+
+    private lateinit var mUserAccountViewModel: UserAccountViewModel
+
+    /** Current user account */
+    private var mUserAccount: UserAccount? = null
 
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
         return inflater.inflate(R.layout.fragment_receive_transaction, container, false)
@@ -16,6 +39,78 @@ class ReceiveTransactionFragment : Fragment() {
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
+        // Configure UserAccountViewModel to show the current account
+        mUserAccountViewModel = ViewModelProviders.of(this).get(UserAccountViewModel::class.java)
+
+        val userId = PreferenceManager.getDefaultSharedPreferences(context)
+            .getString(Constants.KEY_CURRENT_ACCOUNT_ID, "")
+
+        mUserAccountViewModel.getUserAccount(userId!!).observe(this,
+            Observer<cy.agorise.bitsybitshareswallet.database.entities.UserAccount>{ user ->
+                mUserAccount = UserAccount(user.id, user.name)
+                updateQR()
+        })
+    }
+
+    private fun updateQR() {
+        val inputCoinType = "bts"
+
+        val total = Util.fromBase(AssetAmount(UnsignedLong.valueOf(10), Asset("1.3.0", "bts", 5)))
+        val items = arrayOf(LineItem("transfer", 1, total))
+        val invoice = Invoice(mUserAccount!!.name, "", "#bitsy", inputCoinType, items, "", "")
+        Log.d(TAG, "invoice: " + invoice.toJsonString())
+        try {
+            val bitmap = encodeAsBitmap(Invoice.toQrCode(invoice), "#139657") // PalmPay green
+            ivQR.setImageBitmap(bitmap)
+            //updateAmountAddressUI(total, mUserAccount!!.getName())
+        } catch (e: WriterException) {
+            Log.e(TAG, "WriterException. Msg: " + e.message)
+        }
 
     }
+
+    /**
+     * Encodes the provided data as a QR-code. Used to provide payment requests.
+     * @param data: Data containing payment request data as the recipient's address and the requested amount.
+     * @param color: The color used for the QR-code
+     * @return Bitmap with the QR-code encoded data
+     * @throws WriterException if QR Code cannot be generated
+     */
+    @Throws(WriterException::class)
+    internal fun encodeAsBitmap(data: String, color: String): Bitmap? {
+        val result: BitMatrix
+
+        // Get measured width and height of the ImageView where the QR code will be placed
+        var w = ivQR.width
+        var h = ivQR.height
+
+        // Gets minimum side length and sets both width and height to that value so the final
+        // QR code has a squared shape
+        val minSide = if (w < h) w else h
+        h = minSide
+        w = h
+
+        try {
+            val hints = HashMap<EncodeHintType, Any>()
+            hints[EncodeHintType.MARGIN] = 0
+            result = MultiFormatWriter().encode(
+                data,
+                BarcodeFormat.QR_CODE, w, h, hints
+            )
+        } catch (iae: IllegalArgumentException) {
+            // Unsupported format
+            return null
+        }
+
+        val pixels = IntArray(w * h)
+        for (y in 0 until h) {
+            val offset = y * w
+            for (x in 0 until w) {
+                pixels[offset + x] = if (result.get(x, y)) Color.parseColor(color) else Color.WHITE
+            }
+        }
+        val bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888)
+        bitmap.setPixels(pixels, 0, w, 0, 0, w, h)
+        return bitmap
+    }
 }

app/src/main/res/layout/fragment_receive_transaction.xml

@@ -38,12 +38,17 @@
 
     </com.google.android.material.textfield.TextInputLayout>
 
+    <androidx.appcompat.widget.AppCompatAutoCompleteTextView
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"/>
+
     <Spinner
         android:id="@+id/spAsset"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
         android:layout_marginTop="12dp"
         android:layout_marginStart="12dp"
+        android:visibility="gone"
         app:layout_constraintTop_toTopOf="@+id/tilAmount"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toEndOf="@id/centeredVerticalGuideline"/>