extract QR-scanning machinery from new transaction fragment

[mobile-ledger.git] / app / src / main / java / net / ktnx / mobileledger / ui / QR.java

diff --git a/app/src/main/java/net/ktnx/mobileledger/ui/QR.java b/app/src/main/java/net/ktnx/mobileledger/ui/QR.java
new file mode 100644 (file)
index 0000000..9735a6f
--- /dev/null
+++ b/app/src/main/java/net/ktnx/mobileledger/ui/QR.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright © 2021 Damyan Ivanov.
+ * This file is part of MoLe.
+ * MoLe is free software: you can distribute it and/or modify it
+ * under the term of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your opinion), any later version.
+ *
+ * MoLe is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License terms for details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with MoLe. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package net.ktnx.mobileledger.ui;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.Intent;
+
+import androidx.activity.result.ActivityResultCaller;
+import androidx.activity.result.ActivityResultLauncher;
+import androidx.activity.result.contract.ActivityResultContract;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+public class QR {
+    private static final String SCAN_APP_NAME = "com.google.zxing.client.android.SCAN";
+    public static ActivityResultLauncher<Void> registerLauncher(ActivityResultCaller activity,
+                                                                QRScanResultReceiver resultReceiver) {
+        return activity.registerForActivityResult(new ActivityResultContract<Void, String>() {
+            @NonNull
+            @Override
+            public Intent createIntent(@NonNull Context context, Void input) {
+                final Intent intent = new Intent(SCAN_APP_NAME);
+                intent.putExtra("SCAN_MODE", "QR_CODE_MODE");
+                return intent;
+            }
+            @Override
+            public String parseResult(int resultCode, @Nullable Intent intent) {
+                if (resultCode == Activity.RESULT_CANCELED || intent == null)
+                    return null;
+                return intent.getStringExtra("SCAN_RESULT");
+            }
+        }, resultReceiver::onQRScanResult);
+    }
+    public interface QRScanResultReceiver {
+        void onQRScanResult(String scanned);
+    }
+}